Maven多模塊，Dubbo分佈式服務框架，SpringMVC，先後端分離項目，基礎搭建，搭建過程出現的問題

時間  2019-11-19
標籤 maven 多模塊 dubbo 分佈式 服務 框架 springmvc 後端 分離 項目 基礎 搭建 過程 出現 問題 欄目 Maven 简体版
原文   原文鏈接

　　現互聯網公司後端架構經常使用到Spring+SpringMVC+MyBatis，經過Maven來構建。經過學習，我已經掌握了基本的搭建過程，寫下基礎文章爲然後的深刻學習奠基基礎。html

　　首先說一下這篇文章的主要內容分爲：前端

　　一、Maven多模塊項目的建立；java

　　二、Maven與SpringMVC的整合；mysql

　　三、Dubbo的環境配置及與整合；git

　　四、新手在整合過程易犯的錯誤。github

　　經過一個簡單的demo來講明，你們多多指教，分享經驗！web

　　1、Maven多模塊項目的建立spring

　　　　咱們須要創建一個多模塊的maven項目，其目錄結構爲sql

　　　　

 　　　其中student-api用於暴露接口；student-service用語處理業務邏輯及調用數據訪問對象，返回相應數據；student-web主要用於提供dubbo服務，及其餘db、spring、springMVC、mybatis等配置。這樣設計可以將業務邏輯與數據訪問隔離開，同時貼合了spring目標之一，就是容許咱們在開發應用的程序時，可以遵循面向對象（OO）原則中的「針對接口編程」，很大程度上達到鬆耦合。這裏將接口API隔離出來做爲dubbo生產者的服務接口，供消費應用調用（在後續詳細講解）。數據庫

　　　　1.新建Maven項目

　　　　

　　　   2.選擇項目存放路徑後，選擇建立一個簡單的maven項目

　　　　

　　　　3.填寫GroupId和ArtifactId,注意選擇或者填寫版本號

　　　　　

　　　　點擊完成後，創建好了student-demo項目。以後刪除項目src目錄，打開pom.xml將<packaging>jar</packaging>修改成<packaging>pom</packaging>，pom表示它是一個被繼承的模塊。修改後的pom.xml以下

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.student.demo</groupId>
  <artifactId>student-demo</artifactId>
  <version>1.0.0-SNAPSHOT</version>
  <packaging>pom</packaging>

  <name>student-demo</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <!--模塊創建好之後自動生成的-->
   <modules>
      <module>student-service</module>
      <module>student-api</module>
      <module>student-web</module>
  </modules>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

　　　　在建成的項目student-demo上右鍵選擇Maven Module後建立子項目student-api。

　　　　

　　　　填寫子模塊名字：

　　　　

　　　　項目類型選擇：

　　　　

　　　　點擊完成，創建好第一個模塊後，一樣的過程創建好student-service模塊和student-web模塊，須要注意的是student-web選擇的maven類型是：

　　　　

　　　　修改子模塊項目目錄中的pom.xml文件，把<groupId>XXX</groupId>和<version>1.0.0-SNAPSHOT</version>去掉，加上<packaging>jar</packaging>，由於groupId和version會繼承student-demo中的groupId和version，packaging設置打包方式爲jar。例如修改後的student-service模塊的pom.xml以下：

 1 <?xml version="1.0"?>
 2 <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
 3  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 4   <modelVersion>4.0.0</modelVersion>
 5   <parent>
 6     <groupId>com.student.demo</groupId>
 7     <artifactId>student-demo</artifactId>
 8     <version>1.0.0-SNAPSHOT</version>
 9   </parent>
10   
11   <artifactId>student-service</artifactId>
12   <packaging>jar</packaging>
13 </project>

　　　　至此，maven多模塊項目已經建立完成，如今咱們須要在student-demo項目的pom中增長<dependencyManagement>標籤訂義可被子項目繼承的第三方依賴包，打包配置，資源插件等，同時注意統必定義依賴的版本，避免衝突。這裏還利用Maven配置了profiles，可根據狀況增長不一樣的運行環境，並方便快捷地切換項目運行環境，目前咱們只設置了dev開發環境。

 1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 3   <modelVersion>4.0.0</modelVersion>
 4 
 5   <groupId>com.student.demo</groupId>
 6   <artifactId>student-demo</artifactId>
 7   <version>1.0.0-SNAPSHOT</version>
 8   <packaging>pom</packaging>
 9 
 10   <properties>
 11     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 12     <dep.ver.lombok>1.16.10</dep.ver.lombok>
 13         <dep.ver.druid>1.0.1</dep.ver.druid>
 14         <dep.ver.mysql>5.1.21</dep.ver.mysql>
 15         <dep.ver.springframework>4.2.5.RELEASE</dep.ver.springframework>
 16         <dep.ver.mybatis>3.3.0</dep.ver.mybatis>
 17         <dep.ver.mybatis-spring>1.3.0</dep.ver.mybatis-spring>
 18         <dep.ver.pagehelper>4.1.6</dep.ver.pagehelper>
 19         <dep.ver.aspectjrt>1.5.4</dep.ver.aspectjrt>
 20         <dep.ver.aspectjweaver>1.8.0</dep.ver.aspectjweaver>
 21         <dep.ver.servlet>3.1.0</dep.ver.servlet>
 22         <dep.ver.orika-core>1.4.6</dep.ver.orika-core>
 23         <dep.ver.javassist>3.20.0-GA</dep.ver.javassist>
 24         <dep.ver.paranamer>2.7</dep.ver.paranamer>
 25         <dep.ver.concurrentlinkedhashmap-lru>1.4.2</dep.ver.concurrentlinkedhashmap-lru>
 26         <dep.ver.gson>2.2.4</dep.ver.gson>
 27         <dep.ver.guava>15.0</dep.ver.guava>
 28         <dep.ver.slf4j>1.7.21</dep.ver.slf4j>
 29         <dep.ver.logback>1.1.7</dep.ver.logback>
 30         <dep.ver.log4j>1.2.12</dep.ver.log4j>
 31         <dep.ver.slf4j-log4j12>1.7.5</dep.ver.slf4j-log4j12>
 32         <dep.ver.logback-ext-spring>0.1.2</dep.ver.logback-ext-spring>
 33         <dep.ver.dubbo>2.5.3</dep.ver.dubbo>
 34         <dep.ver.zookeeper>3.4.8</dep.ver.zookeeper>
 35         <dep.ver.zkclient>0.8</dep.ver.zkclient>
 36         <dep.ver.commons-lang3>3.1</dep.ver.commons-lang3>
 37         <dep.ver.jackson>1.9.12</dep.ver.jackson>
 38         <dep.ver.shiro>1.2.3</dep.ver.shiro>
 39         <dep.ver.freemarker>2.3.22</dep.ver.freemarker>
 40         <dep.ver.commons-beanutils>1.9.2</dep.ver.commons-beanutils>
 41         <dep.ver.junit>4.11</dep.ver.junit>
 42         <dep.ver.mockito>1.10.19</dep.ver.mockito>
 43         <dep.ver.joda-time>2.9.3</dep.ver.joda-time>
 44         <dep.ver.commons-collections4>4.1</dep.ver.commons-collections4>
 45         <dep.ver.httpclient>4.5.2</dep.ver.httpclient>
 46 
 47         <dep.ver.fastjson>1.2.11</dep.ver.fastjson>
 48 
 49         <plg.ver.maven-resources-plugin>2.7</plg.ver.maven-resources-plugin>
 50         <plg.ver.maven-compiler-plugin>2.5.1</plg.ver.maven-compiler-plugin>
 51         <plg.ver.maven-source-plugin>3.0.0</plg.ver.maven-source-plugin>
 52         <plg.ver.lombok-maven-plugin>1.14.8.0</plg.ver.lombok-maven-plugin>
 53 
 54         <jdk.ver>1.8</jdk.ver>
 55         <encoding>UTF-8</encoding>
 56         <center.project.name>${project.artifactId}</center.project.name>
 57         <profiles.dir>src/profiles</profiles.dir>
 58         <jackson.version>2.6.0</jackson.version>
 59   </properties>
 60   <modules>
 61       <module>student-service</module>
 62       <module>student-api</module>
 63       <module>student-web</module>
 64   </modules>
 65   
 66   <dependencies>
 67         <dependency>
 68             <groupId>org.hibernate</groupId>
 69             <artifactId>hibernate-validator</artifactId>
 70             <version>5.2.4.Final</version>
 71         </dependency>
 72     </dependencies>
 73   
 74   <dependencyManagement>
 75         <dependencies>
 76             <!-- spring -->
 77             <dependency>
 78                 <groupId>org.springframework</groupId>
 79                 <artifactId>spring-core</artifactId>
 80                 <version>${dep.ver.springframework}</version>
 81                 <exclusions>
 82                     <exclusion>
 83                         <groupId>commons-logging</groupId>
 84                         <artifactId>commons-logging</artifactId>
 85                     </exclusion>
 86                 </exclusions>
 87             </dependency>
 88             <dependency>
 89                 <groupId>org.springframework</groupId>
 90                 <artifactId>spring-context</artifactId>
 91                 <version>${dep.ver.springframework}</version>
 92             </dependency>
 93             <dependency>
 94                 <groupId>org.springframework</groupId>
 95                 <artifactId>spring-context-support</artifactId>
 96                 <version>${dep.ver.springframework}</version>
 97             </dependency>
 98             <dependency>
 99                 <groupId>org.springframework</groupId>
100                 <artifactId>spring-web</artifactId>
101                 <version>${dep.ver.springframework}</version>
102             </dependency>
103             <dependency>
104                 <groupId>org.springframework</groupId>
105                 <artifactId>spring-webmvc</artifactId>
106                 <version>${dep.ver.springframework}</version>
107             </dependency>
108             <dependency>
109                 <groupId>org.springframework</groupId>
110                 <artifactId>spring-jdbc</artifactId>
111                 <version>${dep.ver.springframework}</version>
112             </dependency>
113             <dependency>
114                 <groupId>org.springframework</groupId>
115                 <artifactId>spring-tx</artifactId>
116                 <version>${dep.ver.springframework}</version>
117             </dependency>
118             <dependency>
119                 <groupId>org.springframework</groupId>
120                 <artifactId>spring-aspects</artifactId>
121                 <version>${dep.ver.springframework}</version>
122             </dependency>
123             <!-- spring -->
124             <!-- db -->
125             <dependency>
126                 <groupId>com.alibaba</groupId>
127                 <artifactId>druid</artifactId>
128                 <version>${dep.ver.druid}</version>
129             </dependency>
130             <dependency>
131                 <groupId>mysql</groupId>
132                 <artifactId>mysql-connector-java</artifactId>
133                 <version>${dep.ver.mysql}</version>
134             </dependency>
135             <!-- db -->
136             <!-- mybatis -->
137             <dependency>
138                 <groupId>org.mybatis</groupId>
139                 <artifactId>mybatis</artifactId>
140                 <version>${dep.ver.mybatis}</version>
141             </dependency>
142             <dependency>
143                 <groupId>org.mybatis</groupId>
144                 <artifactId>mybatis-spring</artifactId>
145                 <version>${dep.ver.mybatis-spring}</version>
146             </dependency>
147             <dependency>
148                 <groupId>com.github.pagehelper</groupId>
149                 <artifactId>pagehelper</artifactId>
150                 <version>${dep.ver.pagehelper}</version>
151             </dependency>
152             <!-- mybatis -->
153             <!-- apache -->
154             <dependency>
155                 <groupId>org.apache.commons</groupId>
156                 <artifactId>commons-lang3</artifactId>
157                 <version>${dep.ver.commons-lang3}</version>
158             </dependency>
159             <!-- apache -->
160             <!-- commons-beanutils -->
161             <dependency>
162                 <groupId>commons-beanutils</groupId>
163                 <artifactId>commons-beanutils</artifactId>
164                 <version>${dep.ver.commons-beanutils}</version>
165                 <exclusions>
166                     <exclusion>
167                         <groupId>commons-logging</groupId>
168                         <artifactId>commons-logging</artifactId>
169                     </exclusion>
170                 </exclusions>
171             </dependency>
172             <!-- commons-beanutils -->
173             <!-- log -->
174             <dependency>
175                 <groupId>org.slf4j</groupId>
176                 <artifactId>slf4j-api</artifactId>
177                 <version>${dep.ver.slf4j}</version>
178             </dependency>
179             <dependency>
180                 <groupId>org.slf4j</groupId>
181                 <artifactId>log4j-over-slf4j</artifactId>
182                 <version>${dep.ver.slf4j}</version>
183             </dependency>
184             <dependency>
185                 <groupId>org.slf4j</groupId>
186                 <artifactId>jcl-over-slf4j</artifactId>
187                 <version>${dep.ver.slf4j}</version>
188             </dependency>
189             <dependency>
190                 <groupId>ch.qos.logback</groupId>
191                 <artifactId>logback-classic</artifactId>
192                 <version>${dep.ver.logback}</version>
193             </dependency>
194             <!-- log -->
195             <!-- dubbo -->
196             <dependency>
197                 <groupId>com.alibaba</groupId>
198                 <artifactId>dubbo</artifactId>
199                 <version>${dep.ver.dubbo}</version>
200                 <exclusions>
201                     <exclusion>
202                         <artifactId>spring</artifactId>
203                         <groupId>org.springframework</groupId>
204                     </exclusion>
205                     <exclusion>
206                         <artifactId>netty</artifactId>
207                         <groupId>org.jboss.netty</groupId>
208                     </exclusion>
209                 </exclusions>
210             </dependency>
211             <!-- dubbo -->
212             <!-- zookeeper -->
213             <dependency>
214                 <groupId>org.apache.zookeeper</groupId>
215                 <artifactId>zookeeper</artifactId>
216                 <version>${dep.ver.zookeeper}</version>
217                 <exclusions>
218                     <exclusion>
219                         <groupId>log4j</groupId>
220                         <artifactId>log4j</artifactId>
221                     </exclusion>
222                 </exclusions>
223             </dependency>
224             <dependency>
225                 <groupId>com.101tec</groupId>
226                 <artifactId>zkclient</artifactId>
227                 <version>${dep.ver.zkclient}</version>
228                 <exclusions>
229                     <exclusion>
230                         <groupId>log4j</groupId>
231                         <artifactId>log4j</artifactId>
232                     </exclusion>
233                 </exclusions>
234             </dependency>
235             <!-- zookeeper -->
236             <!-- jackson -->
237             <dependency>
238                 <groupId>org.codehaus.jackson</groupId>
239                 <artifactId>jackson-core-asl</artifactId>
240                 <version>${dep.ver.jackson}</version>
241             </dependency>
242             <dependency>
243                 <groupId>org.codehaus.jackson</groupId>
244                 <artifactId>jackson-mapper-asl</artifactId>
245                 <version>${dep.ver.jackson}</version>
246             </dependency>
247             <!-- jackson -->
248             <!-- aspectj -->
249             <dependency>
250                 <groupId>aspectj</groupId>
251                 <artifactId>aspectjrt</artifactId>
252                 <version>${dep.ver.aspectjrt}</version>
253             </dependency>
254             <dependency>
255                 <groupId>org.aspectj</groupId>
256                 <artifactId>aspectjweaver</artifactId>
257                 <version>${dep.ver.aspectjweaver}</version>
258             </dependency>
259             <!-- aspectj -->
260             <!-- servlet -->
261             <dependency>
262                 <groupId>javax.servlet</groupId>
263                 <artifactId>javax.servlet-api</artifactId>
264                 <version>${dep.ver.servlet}</version>
265                 <scope>provided</scope>
266             </dependency>
267             <!-- servlet -->
268             <!-- javassist -->
269             <dependency>
270                 <groupId>org.javassist</groupId>
271                 <artifactId>javassist</artifactId>
272                 <version>${dep.ver.javassist}</version>
273             </dependency>
274             <!-- javassist -->
275             <!-- test start -->
276             <dependency>
277                 <groupId>junit</groupId>
278                 <artifactId>junit</artifactId>
279                 <version>${dep.ver.junit}</version>
280                 <scope>test</scope>
281             </dependency>
282             <dependency>
283                 <groupId>org.springframework</groupId>
284                 <artifactId>spring-test</artifactId>
285                 <version>${dep.ver.springframework}</version>
286                 <scope>test</scope>
287             </dependency>
288             <dependency>
289                 <groupId>org.mockito</groupId>
290                 <artifactId>mockito-core</artifactId>
291                 <version>${dep.ver.mockito}</version>
292                 <scope>test</scope>
293             </dependency>
294             <!-- test end -->
295             <!-- google -->
296             <dependency>
297                 <groupId>com.google.code.gson</groupId>
298                 <artifactId>gson</artifactId>
299                 <version>${dep.ver.gson}</version>
300             </dependency>
301             <dependency>
302                 <groupId>com.google.guava</groupId>
303                 <artifactId>guava</artifactId>
304                 <version>${dep.ver.guava}</version>
305             </dependency>
306             <!-- google -->
307             <!-- lombok -->
308             <dependency>
309                 <groupId>org.projectlombok</groupId>
310                 <artifactId>lombok</artifactId>
311                 <version>${dep.ver.lombok}</version>
312             </dependency>
313             <!-- lombok -->
314             <dependency>
315                 <groupId>org.apache.commons</groupId>
316                 <artifactId>commons-collections4</artifactId>
317                 <version>${dep.ver.commons-collections4}</version>
318             </dependency>
319             <dependency>
320                 <groupId>org.apache.httpcomponents</groupId>
321                 <artifactId>httpclient</artifactId>
322                 <version>${dep.ver.httpclient}</version>
323                 <exclusions>
324                     <exclusion>
325                         <groupId>commons-logging</groupId>
326                         <artifactId>commons-logging</artifactId>
327                     </exclusion>
328                 </exclusions>
329             </dependency>
330         </dependencies>
331     </dependencyManagement>
332   
333   <profiles>
334         <profile>
335             <id>local</id>
336             <build>
337                 <resources>
338                     <resource>
339                         <directory>${profiles.dir}/local</directory>
340                     </resource>
341                 </resources>
342             </build>
343         </profile>
344 
345         <profile>
346             <id>dev</id>
347             <build>
348                 <resources>
349                     <resource>
350                         <directory>${profiles.dir}/dev</directory>
351                     </resource>
352                 </resources>
353             </build>
354         </profile>
355     </profiles>
356 
357     <build>
358         <finalName>${center.project.name}</finalName>
359 
360         <plugins>
361             <plugin>
362                 <groupId>org.apache.maven.plugins</groupId>
363                 <artifactId>maven-resources-plugin</artifactId>
364                 <version>${plg.ver.maven-resources-plugin}</version>
365                 <configuration>
366                     <encoding>${encoding}</encoding>
367                 </configuration>
368             </plugin>
369             <plugin>
370                 <groupId>org.apache.maven.plugins</groupId>
371                 <artifactId>maven-compiler-plugin</artifactId>
372                 <version>${plg.ver.maven-compiler-plugin}</version>
373                 <configuration>
374                     <source>${jdk.ver}</source>
375                     <target>${jdk.ver}</target>
376                     <encoding>${encoding}</encoding>
377                 </configuration>
378             </plugin>
379             <plugin>
380                 <artifactId>maven-source-plugin</artifactId>
381                 <version>${plg.ver.maven-source-plugin}</version>
382                 <configuration>
383                     <attach>true</attach>
384                 </configuration> 
385                 <executions>
386                     <execution>
387                         <phase>compile</phase>
388                         <goals>
389                             <goal>jar</goal>
390                         </goals>
391                     </execution>
392                 </executions>
393             </plugin>
394         </plugins>
395         <resources>
396             <resource>
397                 <directory>src/main/resources</directory>
398                 <filtering>true</filtering>
399             </resource>
400         </resources>
401     </build>
402 </project>
View Code

　　　　在student-api中繼承父pom的依賴，而且直接引入。

 1 <?xml version="1.0"?>
 2 <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
 3  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 4   <modelVersion>4.0.0</modelVersion>
 5   <parent>
 6     <groupId>com.student.demo</groupId>
 7     <artifactId>student-demo</artifactId>
 8     <version>1.0.0-SNAPSHOT</version>
 9   </parent>
10   <artifactId>student-api</artifactId>
11  
12  <dependencies>
13         <dependency>
14             <groupId>com.alibaba</groupId>
15             <artifactId>fastjson</artifactId>
16             <version>${dep.ver.fastjson}</version>
17         </dependency>
18 
19         <dependency>
20             <groupId>org.springframework</groupId>
21             <artifactId>spring-context</artifactId>
22         </dependency>
23         <dependency>
24             <groupId>org.springframework</groupId>
25             <artifactId>spring-web</artifactId>
26         </dependency>
27         <dependency>
28             <groupId>org.apache.httpcomponents</groupId>
29             <artifactId>httpclient</artifactId>
30         </dependency>
31         <!-- google -->
32         <dependency>
33             <groupId>com.google.code.gson</groupId>
34             <artifactId>gson</artifactId>
35         </dependency>
36         <dependency>
37             <groupId>com.google.guava</groupId>
38             <artifactId>guava</artifactId>
39         </dependency>
40         <!-- google -->
41 
42     </dependencies>
43 </project>
View Code

　　　　在student-service中添加繼承依賴，添加對student-api的依賴。

 1 <?xml version="1.0"?>
 2 <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
 3  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 4   <modelVersion>4.0.0</modelVersion>
 5   <parent>
 6     <groupId>com.student.demo</groupId>
 7     <artifactId>student-demo</artifactId>
 8     <version>1.0.0-SNAPSHOT</version>
 9   </parent>
 10   <artifactId>student-service</artifactId>
 11 
 12   <dependencies>
 13         <dependency>
 14             <groupId>com.student.demo</groupId>
 15             <artifactId>student-api</artifactId>
 16             <version>1.0.0-SNAPSHOT</version>
 17         </dependency>
 18 
 19         <dependency>
 20             <groupId>com.alibaba</groupId>
 21             <artifactId>fastjson</artifactId>
 22             <version>${dep.ver.fastjson}</version>
 23         </dependency>
 24 
 25         <!-- oss相關依賴 -->
 26         <dependency>
 27             <groupId>com.aliyun.oss</groupId>
 28             <artifactId>aliyun-sdk-oss</artifactId>
 29             <version>2.0.7</version>
 30             <exclusions>
 31                 <exclusion>
 32                     <groupId>commons-logging</groupId>
 33                     <artifactId>commons-logging</artifactId>
 34                 </exclusion>
 35             </exclusions>
 36         </dependency>
 37         <!-- oss相關依賴 結束 -->
 38 
 39         <!-- db -->
 40         <dependency>
 41             <groupId>com.alibaba</groupId>
 42             <artifactId>druid</artifactId>
 43         </dependency>
 44         <dependency>
 45             <groupId>mysql</groupId>
 46             <artifactId>mysql-connector-java</artifactId>
 47         </dependency>
 48         <!-- db -->
 49 
 50         <!-- mybatis -->
 51         <dependency>
 52             <groupId>org.mybatis</groupId>
 53             <artifactId>mybatis</artifactId>
 54         </dependency>
 55         <dependency>
 56             <groupId>org.mybatis</groupId>
 57             <artifactId>mybatis-spring</artifactId>
 58         </dependency>
 59         <dependency>
 60             <groupId>com.github.pagehelper</groupId>
 61             <artifactId>pagehelper</artifactId>
 62         </dependency>
 63         <!-- mybatis -->
 64 
 65         <!-- spring配置 -->
 66         <dependency>
 67             <groupId>org.springframework</groupId>
 68             <artifactId>spring-core</artifactId>
 69         </dependency>
 70         <dependency>
 71             <groupId>org.springframework</groupId>
 72             <artifactId>spring-context</artifactId>
 73         </dependency>
 74         <dependency>
 75             <groupId>org.springframework</groupId>
 76             <artifactId>spring-webmvc</artifactId>
 77         </dependency>
 78         <dependency>
 79             <groupId>org.springframework</groupId>
 80             <artifactId>spring-jdbc</artifactId>
 81         </dependency>
 82         <dependency>
 83             <groupId>org.springframework</groupId>
 84             <artifactId>spring-context-support</artifactId>
 85         </dependency>
 86         <dependency>
 87             <groupId>org.springframework</groupId>
 88             <artifactId>spring-tx</artifactId>
 89         </dependency>
 90         <dependency>
 91             <groupId>org.springframework</groupId>
 92             <artifactId>spring-aspects</artifactId>
 93         </dependency>
 94         <!-- spring配置 -->
 95 
 96         <!-- jackson -->
 97         <!-- <dependency> -->
 98         <!-- <groupId>org.codehaus.jackson</groupId> -->
 99         <!-- <artifactId>jackson-core-asl</artifactId> -->
100         <!-- </dependency> -->
101         <!-- <dependency> -->
102         <!-- <groupId>org.codehaus.jackson</groupId> -->
103         <!-- <artifactId>jackson-mapper-asl</artifactId> -->
104         <!-- </dependency> -->
105         <dependency>
106             <groupId>com.fasterxml.jackson.core</groupId>
107             <artifactId>jackson-core</artifactId>
108             <version>${jackson.version}</version>
109         </dependency>
110         <dependency>
111             <groupId>com.fasterxml.jackson.core</groupId>
112             <artifactId>jackson-databind</artifactId>
113             <version>${jackson.version}</version>
114         </dependency>
115         <dependency>
116             <groupId>com.fasterxml.jackson.core</groupId>
117             <artifactId>jackson-annotations</artifactId>
118             <version>${jackson.version}</version>
119         </dependency>
120         <!-- jackson -->
121 
122         <!-- log -->
123         <dependency>
124             <groupId>org.slf4j</groupId>
125             <artifactId>slf4j-api</artifactId>
126         </dependency>
127         <dependency>
128             <groupId>ch.qos.logback</groupId>
129             <artifactId>logback-classic</artifactId>
130         </dependency>
131         <dependency>
132             <groupId>org.slf4j</groupId>
133             <artifactId>log4j-over-slf4j</artifactId>
134         </dependency>
135         <dependency>
136             <groupId>org.slf4j</groupId>
137             <artifactId>jcl-over-slf4j</artifactId>
138         </dependency>
139         <!-- log -->
140 
141         <!-- google -->
142         <dependency>
143             <groupId>com.google.guava</groupId>
144             <artifactId>guava</artifactId>
145         </dependency>
146         <!-- <dependency> -->
147         <!-- <groupId>com.google.code.gson</groupId> -->
148         <!-- <artifactId>gson</artifactId> -->
149         <!-- </dependency> -->
150         <!-- google -->
151 
152         <dependency>
153             <groupId>org.apache.commons</groupId>
154             <artifactId>commons-lang3</artifactId>
155         </dependency>
156 
157         <dependency>
158             <groupId>commons-beanutils</groupId>
159             <artifactId>commons-beanutils</artifactId>
160         </dependency>
161 
162         <dependency>
163             <groupId>javax.servlet</groupId>
164             <artifactId>javax.servlet-api</artifactId>
165         </dependency>
166 
167         <dependency>
168             <groupId>org.javassist</groupId>
169             <artifactId>javassist</artifactId>
170         </dependency>
171 
172         <!-- aspectj -->
173         <dependency>
174             <groupId>aspectj</groupId>
175             <artifactId>aspectjrt</artifactId>
176         </dependency>
177         <dependency>
178             <groupId>org.aspectj</groupId>
179             <artifactId>aspectjweaver</artifactId>
180         </dependency>
181         <!-- aspectj -->
182 
183         <!-- dubbo -->
184         <dependency>
185             <groupId>com.alibaba</groupId>
186             <artifactId>dubbo</artifactId>
187             <exclusions>
188                 <exclusion>
189                     <artifactId>spring</artifactId>
190                     <groupId>org.springframework</groupId>
191                 </exclusion>
192                 <exclusion>
193                     <artifactId>netty</artifactId>
194                     <groupId>org.jboss.netty</groupId>
195                 </exclusion>
196             </exclusions>
197         </dependency>
198         <dependency>
199             <groupId>org.apache.zookeeper</groupId>
200             <artifactId>zookeeper</artifactId>
201             <exclusions>
202                 <exclusion>
203                     <groupId>org.slf4j</groupId>
204                     <artifactId>slf4j-log4j12</artifactId>
205                 </exclusion>
206             </exclusions>
207         </dependency>
208         <dependency>
209             <groupId>com.101tec</groupId>
210             <artifactId>zkclient</artifactId>
211             <exclusions>
212                 <exclusion>
213                     <groupId>org.slf4j</groupId>
214                     <artifactId>slf4j-log4j12</artifactId>
215                 </exclusion>
216             </exclusions>
217         </dependency>
218         <!-- dubbo -->
219 
220         <dependency>
221             <groupId>org.apache.httpcomponents</groupId>
222             <artifactId>httpclient</artifactId>
223         </dependency>
224 
225         <dependency>
226             <groupId>cglib</groupId>
227             <artifactId>cglib</artifactId>
228             <version>3.1</version>
229         </dependency>
230     </dependencies>
231 </project>
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　　　　在student-web中繼承依賴，添加對student-api，student-service的依賴。注意子項目依賴版本都爲<version>1.0.0-SNAPSHOT</version>

 1 <?xml version="1.0"?>
 2 <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
 3  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 4   <modelVersion>4.0.0</modelVersion>
 5   <parent>
 6     <groupId>com.student.demo</groupId>
 7     <artifactId>student-demo</artifactId>
 8     <version>1.0.0-SNAPSHOT</version>
 9   </parent>
10   <artifactId>student-web</artifactId>
11   <packaging>war</packaging>
12   <dependencies>
13         <dependency>
14             <groupId>junit</groupId>
15             <artifactId>junit</artifactId>
16         </dependency>
17     
18         <dependency>
19             <groupId>com.student.demo</groupId>
20             <artifactId>student-api</artifactId>
21             <version>1.0.0-SNAPSHOT</version>
22         </dependency>
23         <dependency>
24             <groupId>com.student.demo</groupId>
25             <artifactId>student-service</artifactId>
26             <version>1.0.0-SNAPSHOT</version>
27         </dependency>
28     </dependencies>
29   <build>
30     <finalName>student-web</finalName>
31   </build>
32 </project>
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　　　2、Maven與SpringMVC的整合

　　　　1.第一部分已經在項目pom文件中配置了spring的相關依賴

　　　　2.在student-web項目根路徑上添加profiles源目錄及配置文件

　　　　　注意是創建源文件不是普通文件夾。

　　　　　

　　　　　而後在此源文件夾下創建普通文件夾props，用於存放配置文件。在props下新建db-config.properties資源文件，用於配置mysql，其配置內容爲：

1 database.database=mysql 2 database.driverClassName=com.mysql.jdbc.Driver 3 database.url=jdbc:mysql://172.0.0.1:3306/student_data?characterEncoding=utf8 4 database.user=root 5 database.password=root 6 database.show_sql=true

　　　　　在mysql數據庫中創建一張簡單的student數據表，其結構爲：

　　　　　

　　　　　3.在student-web的src/main/resources目錄中新建spring文件夾，新建spring-base.xml和spring-dispatcher.xml。其中值得說明一下的是，spring監聽器ContextLoaderListener和控制器DispatcherServlet會加載應用上下文。其中上下文參數contextConfigLocation的value值是根應用上下文路徑classpath:spring/spring-base.xml，它會被ContextLoaderListener加載bean定義。spring-base.xml中的內容爲：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <!-- 開啓aspectj自動註解 -->
    <aop:aspectj-autoproxy proxy-target-class="true" />

    <context:component-scan base-package="org.student" />
    <context:annotation-config />

    <!-- 配置文件加載 -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="order" value="1" />
        <property name="ignoreUnresolvablePlaceholders" value="true" />
        <property name="locations">
            <list>
                <value>classpath:props/db-config.properties</value>
            </list>
        </property>
    </bean>
    <import resource="classpath:spring/spring-db.xml" />
</beans>
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　　　　   一樣DispatcherServlet會從classpath:spring/spring-dispatcher.xml加載它的bean。

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
 4  xmlns:mvc="http://www.springframework.org/schema/mvc"
 5  xsi:schemaLocation="http://www.springframework.org/schema/beans  6  http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  7  http://www.springframework.org/schema/context  8  http://www.springframework.org/schema/context/spring-context-3.0.xsd  9  http://www.springframework.org/schema/mvc 10  http://www.springframework.org/schema/mvc/spring-mvc.xsd">
11 
12     <mvc:annotation-driven>
13         <mvc:message-converters>
14             <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter " />
15         </mvc:message-converters>
16     </mvc:annotation-driven>
17 
18     <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
19     <!-- 至關於註冊了DefaultAnnotationHandlerMapping和AnnotationMethodHandlerAdapter兩個bean，配置一些messageconverter。即解決了@Controller註解的使用前提配置 -->
20 </beans>
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　　　　　4.在Web.xml中聲明DispatcherServlet

　　　　　SpringMVC全部請求都會經過一個前端控制器DispatcherServlet，經過這個控制器將請求委託給應用程序的其它執行單元來處理，因此須要經過web.xml來註冊。打開student-web項目目錄下src/main/webapp/WEB-INF/web.xml，修改web.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3  xmlns="http://java.sun.com/xml/ns/javaee"
 4  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
 5  id="schedule-console" version="3.0">
 6     <display-name>student-web</display-name>
 7 
 8     <!-- web.xml中加載順序是 context-param -> listener -> filter -> servlet -->
 9     <!-- spring基礎配置文件位置 -->
10     <context-param>
11         <param-name>contextConfigLocation</param-name>
12         <param-value>classpath:spring/spring-base.xml</param-value>
13     </context-param>
14 
15     <!-- Spring監聽 -->
16     <listener>
17         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
18     </listener>
19     <!-- 設置servlet編碼開始 -->
20     <filter>
21         <filter-name>characterEncodingFilter</filter-name>
22         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
23         <init-param>
24             <param-name>encoding</param-name>
25             <param-value>UTF-8</param-value>
26         </init-param>
27         <init-param>
28             <param-name>forceEncoding</param-name>
29             <param-value>true</param-value>
30         </init-param>
31     </filter>
32     <filter-mapping>
33         <filter-name>characterEncodingFilter</filter-name>
34         <url-pattern>/*</url-pattern>
35     </filter-mapping>
36     <!-- 設置servlet編碼結束 -->
37     <servlet>
38         <servlet-name>dispatcher</servlet-name>
39         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
40         <init-param>
41             <param-name>contextConfigLocation</param-name>
42             <param-value>classpath:spring/spring-dispatcher.xml</param-value>
43         </init-param>
44     </servlet>
45     <servlet-mapping>
46         <servlet-name>dispatcher</servlet-name>
47         <url-pattern>/</url-pattern>
48     </servlet-mapping>
49 </web-app>
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　　　　　5.spring與Mybatis的整合

　　　　　在student-web的src/main/resources目錄中新建mybatis文件夾，再在此目錄新建mybatis.xml和mapper文件夾。在spring文件夾下新建spring-db.xml用於spring加載mybatis配置。spring-db.xml內容以下：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3  xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
 4  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 5  xsi:schemaLocation="http://www.springframework.org/schema/beans  6  http://www.springframework.org/schema/beans/spring-beans-4.0.xsd  7  http://www.springframework.org/schema/context  8  http://www.springframework.org/schema/context/spring-context-4.0.xsd  9  http://www.springframework.org/schema/tx 10  http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
11 
12     <!-- 採用druid做爲鏈接池 -->
13     <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
14  init-method="init" destroy-method="close">
15         <!-- 基本屬性 url、user、password -->
16         <property name="driverClassName" value="${database.driverClassName}" />
17         <property name="url" value="${database.url}" />
18         <property name="username" value="${database.user}" />
19         <property name="password" value="${database.password}" />
20 
21         <!-- 配置初始化大小、最小、最大 -->
22         <property name="initialSize" value="1" />
23         <property name="minIdle" value="1" />
24         <property name="maxActive" value="20" />
25 
26         <!-- 配置獲取鏈接等待超時的時間 -->
27         <property name="maxWait" value="60000" />
28 
29         <!-- 配置間隔多久才進行一次檢測，檢測須要關閉的空閒鏈接，單位是毫秒 -->
30         <property name="timeBetweenEvictionRunsMillis" value="60000" />
31 
32         <!-- 配置一個鏈接在池中最小生存的時間，單位是毫秒 -->
33         <property name="minEvictableIdleTimeMillis" value="300000" />
34         <property name="validationQuery" value="SELECT 'x'" />
35         <property name="testWhileIdle" value="true" />
36         <property name="testOnBorrow" value="false" />
37         <property name="testOnReturn" value="false" />
38 
39         <!-- 打開PSCache，而且指定每一個鏈接上PSCache的大小 -->
40         <property name="poolPreparedStatements" value="true" />
41         <property name="maxPoolPreparedStatementPerConnectionSize"
42  value="20" />
43 
44         <!-- 配置監控統計攔截的filters -->
45         <property name="filters" value="stat" />
46     </bean>
47 
48     <!-- 配置mybatis的sqlSessionFactory -->
49     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
50         <property name="dataSource" ref="dataSource" />
51         <property name="configLocation" value="classpath:mybatis/mybatis.xml" />
52         <property name="mapperLocations" value="classpath:mybatis/mapper/*.xml" />
53     </bean>
54 
55     <!-- mybatis mapper接口掃描 -->
56     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
57         <property name="basePackage" value="org.student.service.mapper" />
58         <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
59     </bean>
60 
61     <bean id="transactionManager"
62  class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
63         <property name="dataSource" ref="dataSource" />
64     </bean>
65 
66     <!-- 開啓@Transactional事務註解 -->
67     <tx:annotation-driven transaction-manager="transactionManager" />
68 </beans>
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 　　　3、Dubbo的環境配置及與整合

　　　　　咱們已經搭建好student-demo項目來做爲provider，爲其它服務提供接口，因此咱們須要先配置好dubbo提供者，PS：這裏不會講解zookeeper的搭建，請自行百度。其項目結構爲：

　　　　　　

　　　　　1.首先在student-web中配置dubbo

　　　　　因爲咱們已經在student-demo中添加了dubbo和zookeeper的相關依賴，下一步字啊resources目錄中創建dubbo文件夾，再新建dubbo-producer.xml，同時在profiles的dev環境中添加dubbo-producer.properties配置文件，設置zookeeper註冊中心暴露服務地址，配置group分組，服務端口，註冊中心請求超時時間(毫秒)和版本。其中組別＋接口地址＋版本號惟一的標識了一個接口。文件內容爲：

1 student-registry-address=172.0.0.1:2181 2 student-group=student-min 3 student-service-port=22026 4 student-timeout=120000 5 student-version=1.0.0

　　　　　這樣咱們就能夠來配置dubbo-producer.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
    
    <context:property-placeholder location="classpath:props/dubbo-producer.properties" ignore-unresolvable="true"/>
    
    <dubbo:application name="provider-student-demo"/>
    <dubbo:registry address="${student-registry-address}" protocol="zookeeper"/>
    <dubbo:protocol name="dubbo" port="${student-service-port}" accesslog="true" />
</beans>
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　　　　　2.寫一個簡單的服務接口
　　　　　1）首先在student-service中創建Student實體類

 1 package org.student.bean;  2 
 3 public class Student {  4     private Long id;  5     private String name;  6     private Integer age;  7     public Long getId() {  8         return id;  9  } 10     public void setId(Long id) { 11         this.id = id; 12  } 13     public String getName() { 14         return name; 15  } 16     public void setName(String name) { 17         this.name = name; 18  } 19     public Integer getAge() { 20         return age; 21  } 22     public void setAge(Integer age) { 23         this.age = age; 24  } 25     
26     
27 }
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　　　　　2）同時在student-api中創建與實體bean對應的DTO類實現Serializable接口，並重寫toString方法。通常爲了避免破壞實體類和數據庫表一一對應的接口，咱們會新建一個DTO實體類，而且加入一些冗餘的字段，做爲先後端的傳輸對象。

 1 package org.student.api.dto;  2 
 3 import java.io.Serializable;  4 
 5 public class StudentDTO implements Serializable{  6     
 7     private static final long serialVersionUID = 1L;  8     private Long id;  9     private String name; 10     private Integer age; 11     public Long getId() { 12         return id; 13  } 14     public void setId(Long id) { 15         this.id = id; 16  } 17     public String getName() { 18         return name; 19  } 20     public void setName(String name) { 21         this.name = name; 22  } 23     public Integer getAge() { 24         return age; 25  } 26     public void setAge(Integer age) { 27         this.age = age; 28  } 29     
30  @Override 31     public String toString() { 32         return "id = " + id + ", name = " + name + ",age = " + age; 33  } 34     
35     
36 }
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　　　　　3）在student-api中創建StudentApi接口，值得注意的是@service註解中的對象

1 package org.student.api; 2 
3 import java.util.List; 4 
5 import org.student.api.dto.StudentDTO; 6 
7 public interface StudentApi { 8     List<StudentDTO> listStudents(); 9 }
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 　　　　　4）在dubbo-producer.xml中註冊StudentApi，添加配置：

<dubbo:service interface="org.student.api.StudentApi" ref="studentApi" group="${student-group}" version="${student-version}" timeout="${student-timeout}" />

　　　　　5）從service業務邏輯層子模塊開始編寫接口實現，新建在student-service中新建StudentBiz實現StudentApi接口

 1 package org.student.service.biz;  2 
 3 import java.util.List;  4 
 5 import org.slf4j.Logger;  6 import org.slf4j.LoggerFactory;  7 import org.springframework.beans.factory.annotation.Autowired;  8 import org.springframework.stereotype.Service;  9 import org.student.api.StudentApi; 10 import org.student.api.dto.StudentDTO; 11 import org.student.bean.Student; 12 import org.student.service.StudentService; 13 
14 import com.google.common.collect.Lists; 15 
16 @Service("studentApi") 17 public class StudentBiz implements StudentApi{ 18     private Logger logger = LoggerFactory.getLogger(StudentBiz.class); 19     
20  @Autowired 21     private StudentService studentService; 22     
23  @Override 24     public List<StudentDTO> listStudents() { 25         List<Student> listStudent = studentService.listStudent(); 26         List<StudentDTO> listStudentDTO = Lists.newArrayList(); 27         for(Student student: listStudent){ 28             StudentDTO studentDTO = new StudentDTO(); 29  studentDTO.setId(student.getId()); 30  studentDTO.setAge(student.getAge()); 31  studentDTO.setName(student.getName()); 32  listStudentDTO.add(studentDTO); 33  } 34         return listStudentDTO; 35  } 36 }
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　　　　　6）在student-service中建立service層接口StudentService

 1 package org.student.service;  2 
 3 import java.util.List;  4 
 5 import org.springframework.stereotype.Service;  6 import org.student.bean.Student;  7 
 8 @Service  9 public interface StudentService { 10 
11     List<Student> listStudent(); 12     
13 }
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　　　　　7）在student-service中實現StudentService接口

 1 package org.student.service.impl;  2 
 3 import java.util.List;  4 
 5 import javax.annotation.Resource;  6 
 7 import org.springframework.stereotype.Service;  8 import org.student.bean.Student;  9 import org.student.service.StudentService; 10 import org.student.service.mapper.StudentMapper; 11 
12 @Service("studentService") 13 public class StudentServiceImpl implements StudentService{ 14 
15  @Resource 16     private StudentMapper studentMapper; 17     
18  @Override 19     public List<Student> listStudent() { 20         List<Student> listStudent = studentMapper.listStudent(); 21         return listStudent; 22  } 23 
24 }
View Code

　　　　　8）在student-service中建立數據層StudentMapper接口

1 package org.student.service.mapper; 2 
3 import java.util.List; 4 
5 import org.student.bean.Student; 6 
7 public interface StudentMapper { 8     List<Student> listStudent(); 9 }
View Code

　　　　　9）在student-web中建立實體映射的XML文件，注意StudentMapper類與sql ID的對應關係

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
 3 <mapper namespace="org.student.service.mapper.StudentMapper">
 4     <!--查詢字段-->
 5     <sql id="columns">
 6         a.id,
 7         a.name,
 8         a.age
 9     </sql>
10 
11     <!--查詢結果集-->
12     <resultMap id="beanMap" type="org.student.bean.Student">
13         <result property="id" column="id"/>
14         <result property="name" column="name"/>
15         <result property="age" column="age"/>
16     </resultMap>
17 
18 
19     <!--根據主鍵獲取實體-->
20     <select id="listStudent" resultMap="beanMap">
21         SELECT
22         <include refid="columns"/>
23         FROM
24         student a
25     </select>
26 
27 </mapper>
View Code

　　　　   dubbo提供者已建立完成，建立完成子應用結構爲

　　　　　　　

　　　　3.爲了更好的驗證，須要建立一個消費者，跳用dubbo接口，其項目結構與子項目student-web相似，Maven項目類型爲Webapp project。爲了避免冗餘介紹，請參考Maven項目搭建方式。其將建完成的結構爲：
　　　　　　　　　　　
　　　　做爲消費者，student-test項目的dubbo配置有所不一樣
　　　　1）dubbo-consumer.properties的service-group應該與提供者一致，否者找不到提供者方的接口。同時pom.xml中須要增長對的依賴
<dependency>
    <groupId>com.student.demo</groupId>
    <artifactId>student-api</artifactId>
    <version>1.0.0-SNAPSHOT</version>
</dependency>
1 student-registry-address=172.0.0.1:2181 2 student-service-group=student-min 3 student-service-version=1.0.0 4 student-service-timeout=120000

　　　　　2）spring-dubbo-consumer.xml的配置及接口調用方式

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3  xmlns:context="http://www.springframework.org/schema/context"
 4  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
 5  xsi:schemaLocation="http://www.springframework.org/schema/beans  6  http://www.springframework.org/schema/beans/spring-beans.xsd  7  http://www.springframework.org/schema/beans  8  http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  9  http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd 10  http://code.alibabatech.com/schema/dubbo 11  http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
12      
13     <dubbo:application name="consumer-student-test" />
14 
15     <dubbo:registry address="${student-registry-address}" protocol="zookeeper" />
16     
17     
18     <dubbo:reference id="studentApi" interface="org.student.api.StudentApi"
19  group="${student-service-group}" version="${student-service-version}"
20  check="false" />
21     
22 </beans>
View Code

　　　　　3）調用者的controller層

 1 package org.student.controller;  2 
 3 import javax.annotation.Resource;  4 
 5 import org.slf4j.Logger;  6 import org.slf4j.LoggerFactory;  7 import org.springframework.web.bind.annotation.RequestMapping;  8 import org.springframework.web.bind.annotation.RequestMethod;  9 import org.springframework.web.bind.annotation.RestController; 10 import org.student.api.StudentApi; 11 
12 @RestController 13 @RequestMapping("/student") 14 public class StudentController { 15     private static Logger logger = LoggerFactory.getLogger(StudentController.class); 16 
17  @Resource 18     private StudentApi studentApi; 19     
20     @RequestMapping(path = "/listStudent", method = RequestMethod.POST) 21     public void listStudent(){ 22         logger.info("get students..."); 23         logger.info("the data are " + studentApi.listStudents()); 24  } 25 }

　　　　　4）服務器同時啓動provider和consumer，會看到啓動信息

　　　　　　　

　　　　查看zookeeper註冊中心發現提供者消費者都已成功註冊
　　　　　　　
　　　　　　　
　　　　5）測試接口
　　　　因爲我並無寫view層來展現數據，如今只能經過控制檯的日誌信息來簡單測試接口。（logback的用法不作解釋）利用瀏覽器post請求訪問
http://172.0.0.1:8080/student-test/student/listStudent，控制檯輸出爲
[http-nio-8080-exec-2] INFO  2016-11-07 18:33:24.450 o.s.c.StudentController[24] - get students...
[DubboServerHandler-172.28.19.7:22026-thread-2] INFO  2016-11-07 18:33:24.729 d.a.o.s.a.StudentApi[58] -  [DUBBO] [2016-11-07 18:3:24] 172.28.19.7:56346 -> 172.28.19.7:22026 - student-min/org.student.api.StudentApi:1.0.0 listStudents() , dubbo version: 2.5.3, current host: 127.0.0.1
[http-nio-8080-exec-2] INFO  2016-11-07 18:33:25.026 o.s.c.StudentController[25] - the data are [id = 1, name = 張三,age = 20]
 

　　　　4、新手在整合過程易犯的錯誤。
 

　　　　1.ClassNotFound異常
 

 
 
嚴重: Error configuring application listener of class org.springframework.web.context.ContextLoaderListener java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1332) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1166) at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:518) at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:499) at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:118) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4764) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5303) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1407) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1397) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)
 

 

　　　　　　eclipse會自動將deployment assembly指定的工程，打成jar包，放入到web-inf/lib目錄下，tomcat在發佈項目的時候沒有同時發佈maven依賴所添加的jar包，可是若是在deployment assembly沒有配置相應的依賴包，就會拋出異常。解決方法：項目 —> properties -> Deployment Assembly -> Add -> Java Build Path Entries -> 選擇Maven Dependencies -> Finish -> OK 把對應的Maven依賴包也發佈到tomcat，調試時會自動把那些jar發佈到指定目錄下，tomcat也能找到那些jar了。
　　　　　　另外，一樣的報錯可能因爲不一樣的緣由形成，若是沒有激活Maven profile也會報這種錯誤，激活profile的方式有不少，經過命令首先須要在pom.xml中用<profiles>配置（詳細配置請查看上文）再經過命令行：
 

 
 
mvn install -Pdev #激活dev環境
 

 

　　　　　　也能夠經過eclipse的配置：項目－－>properties-->Maven-->填寫profile名－－>apply-->finish
 

　　　　　　　　
 

 
 
　　　　　　2.啓動student-web，spring建立bean對象失敗
 
 
 
  
十一月 07, 2016 8:19:24 下午 org.apache.catalina.core.StandardContext listenerStart 嚴重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.student.api.StudentApi': Cannot resolve reference to bean 'studentApi' while setting bean property 'ref'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'studentApi' is defined at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:359) 　 ... at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) 　... Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'studentApi' is defined at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:698) at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1175) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:284) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:351) ...
 
 
 
 
　　　　　　spring有強大的註解幫助咱們簡化很大部分代碼，並下降的耦合。@Autowired或@Resource在 Bean 類中使用自動注入功能，可是 Bean 仍是在 XML 文件中經過 <bean> 進行定義 —— 也就是說，在 XML 配置文件中定義 Bean，經過@Autowired或@Resource爲 Bean 的成員變量、方法入參或構造函數入參提供自動注入的功能。之前經過在spring文件中配置<bean>的方式被移除，僅須要添加一行 <context:component-scan/> 配置就解決全部問題了——Spring XML 配置文件獲得了極致的簡化。<context:component-scan/> 的 base-package 屬性指定了須要掃描的類包，類包及其遞歸子包中全部的類都會被處理。解決：在spring-base.xml中添加
 
 
 
  
<context:component-scan base-package="org.student" />
 
 
 
 
　　　　　　3.消費者訪問dubbo接口被拒絕
 
 
 
  
嚴重: Servlet.service() for servlet [dispatcher] in context with path [] threw exception [Request processing failed; nested exception is com.alibaba.dubbo.rpc.RpcException: Forbid consumer 172.0.0.1 access service org.student.api.StudentApi from registry 172.0.0.1:2181 use dubbo version 2.5.3, Please check registry access list (whitelist/blacklist).] with root cause com.alibaba.dubbo.rpc.RpcException: Forbid consumer 172.0.0.1 access service org.student.api.StudentApi from registry 172.0.0.1:2181 use dubbo version 2.5.3, Please check registry access list (whitelist/blacklist). at com.alibaba.dubbo.registry.integration.RegistryDirectory.doList(RegistryDirectory.java:579) at com.alibaba.dubbo.rpc.cluster.directory.AbstractDirectory.list(AbstractDirectory.java:73) at com.alibaba.dubbo.rpc.cluster.support.AbstractClusterInvoker.list(AbstractClusterInvoker.java:260) at com.alibaba.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:219) at com.alibaba.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker.invoke(MockClusterInvoker.java:72) at com.alibaba.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:52) at com.alibaba.dubbo.common.bytecode.proxy0.listStudents(proxy0.java) at org.student.controller.StudentController.listStudent(StudentController.java:25) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498)
....
 
 
 
 
　　　　　　若是消費者訪問的接口路徑不正確，則沒法調用接口。出現這種錯誤是我沒有把消費者的組設置成提供者的組，解決方法是group保持一致
 
 
　　　　　　 　　　　　　
 
 
　　　　 　　4.訪問全部接口都報404錯誤 
 
 
 
  
INFO  2016-11-08 12:42:28.507 o.s.w.s.DispatcherServlet[488] - FrameworkServlet 'dispatcher': initialization started
INFO  2016-11-08 12:42:28.518 o.s.w.c.s.XmlWebApplicationContext[578] - Refreshing WebApplicationContext for namespace 'dispatcher-servlet': startup date [Tue Nov 08 12:42:28 CST 2016]; parent: Root WebApplicationContext
INFO  2016-11-08 12:42:28.519 o.s.b.f.x.XmlBeanDefinitionReader[317] - Loading XML bean definitions from class path resource [spring/spring-dispatcher.xml]
INFO  2016-11-08 12:42:28.657 o.s.b.f.s.DefaultListableBeanFactory[839] - Overriding bean definition for bean 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping' with a different definition: replacing [Root bean: class [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] with [Root bean: class [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null]
...
INFO  2016-11-08 12:42:29.545 o.s.w.s.m.m.a.RequestMappingHandlerAdapter[532] - Looking for @ControllerAdvice: WebApplicationContext for namespace 'dispatcher-servlet': startup date [Tue Nov 08 12:42:28 CST 2016]; parent: Root WebApplicationContext
INFO  2016-11-08 12:42:29.810 o.s.w.s.v.v.VelocityConfigurer[140] - ClasspathResourceLoader with name 'springMacro' added to configured VelocityEngine
INFO  2016-11-08 12:42:30.193 o.s.w.s.DispatcherServlet[507] - FrameworkServlet 'dispatcher': initialization completed in 1684 ms
WARN  2016-11-08 12:42:30.206 o.s.w.s.PageNotFound[1136] - No mapping found for HTTP request with URI [/student/listStudent] in DispatcherServlet with name 'dispatcher'
 
 
 
 
　　　　　　這個錯誤我找了好久才發現，並非簡單的訪問路徑錯誤。仔細查看日誌信息會發現spring加載dispatcher的過程，截取在web.xml中配置
 

 

 
 
 
  
<!--spring加載-->
<context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring/spring-base.xml</param-value> </context-param> ...
 
  
<!--springMVC加載-->
 
  
<servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/spring-dispatcher.xml</param-value>
        </init-param>
</servlet>
<servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
</servlet-mapping>
 
 
 
 
　　　　　　在Tomcat啓動時，web.xml中加載順序是 context-param -> listener -> filter -> servlet，ContextLoaderListener基於Web上下文級別的監聽器在啓動服務器時就建立ApplicationContext而且將配置的Spring Bean加載到XML中。DispatcherServlet是一個請求分發控制器，全部匹配的URL都會經過該Servlet分發執行，在建立Servlet對象時會初始化Spring MVC相關配置。spring-dispatcher.xml中定義了控制器映射，使用Controller+RequestMapping註解映射時，相關controller組件掃描要定義在spring-dispatcher.xml中，而非spring-base.xml中。依據這樣的分析，我去查看了student-test項目中spring-dispatcher.xml和spring-base.xml的配置，發現spring-base.xml配置了
 
 
 
  
<context:component-scan base-package="org.student"/>
 
 
 
 
　　　　　　而在spring-dispatcher.xml中未配置掃描路徑。因此spring沒法加載controller中的映射，天然會404了，解決方式則是在spring-dispatcher.xml中加上掃描。
 

 

 
 　　　　　　至此，這是全部我想介紹的內容，歡迎你們批評指正，轉載請註明出處http://www.cnblogs.com/blueness-sunshine/p/6015965.html，另外想要源碼的朋友能夠留言，謝謝。 

 

　　　　　　博客推薦：
 

　　　　　　   http://blessht.iteye.com/blog/2121845
 

　　　　　　　 http://www.cnblogs.com/szlbm/p/5512931.html
 

　　　　　　　 http://blog.csdn.net/congcong68/article/details/41113239
 

　　　　　PS:太多朋友須要源碼，可能沒有及時回覆郵件。現我已上傳至Github，請自行下載，歡迎你們多作交流。
　　　　　student-demo
　　　　　student-test


        

            

        	





    

		

            
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