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

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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

2016年11月10日 15:17:41

閱讀數：7279

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。

　　首先說一下這篇文章的主要內容分爲：

　　一、Maven多模塊項目的建立；

　　二、Maven與SpringMVC的整合；

　　三、Dubbo的環境配置及與整合；

　　四、新手在整合過程易犯的錯誤。

　　經過一個簡單的demo來講明，你們多多指教，分享經驗！

　　1、Maven多模塊項目的建立

　　　　咱們須要創建一個多模塊的maven項目，其目錄結構爲

　　　　

 　　　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）。

　　　　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：

 

<?xml version="1.0"?>
<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"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.student.demo</groupId>
    <artifactId>student-demo</artifactId>
    <version>1.0.0-SNAPSHOT</version>
  </parent>

  <artifactId>student-service</artifactId>
  <packaging>jar</packaging>
</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。

 

<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>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <dep.ver.lombok>1.16.10</dep.ver.lombok>
        <dep.ver.druid>1.0.1</dep.ver.druid>
        <dep.ver.mysql>5.1.21</dep.ver.mysql>
        <dep.ver.springframework>4.2.5.RELEASE</dep.ver.springframework>
        <dep.ver.mybatis>3.3.0</dep.ver.mybatis>
        <dep.ver.mybatis-spring>1.3.0</dep.ver.mybatis-spring>
        <dep.ver.pagehelper>4.1.6</dep.ver.pagehelper>
        <dep.ver.aspectjrt>1.5.4</dep.ver.aspectjrt>
        <dep.ver.aspectjweaver>1.8.0</dep.ver.aspectjweaver>
        <dep.ver.servlet>3.1.0</dep.ver.servlet>
        <dep.ver.orika-core>1.4.6</dep.ver.orika-core>
        <dep.ver.javassist>3.20.0-GA</dep.ver.javassist>
        <dep.ver.paranamer>2.7</dep.ver.paranamer>
        <dep.ver.concurrentlinkedhashmap-lru>1.4.2</dep.ver.concurrentlinkedhashmap-lru>
        <dep.ver.gson>2.2.4</dep.ver.gson>
        <dep.ver.guava>15.0</dep.ver.guava>
        <dep.ver.slf4j>1.7.21</dep.ver.slf4j>
        <dep.ver.logback>1.1.7</dep.ver.logback>
        <dep.ver.log4j>1.2.12</dep.ver.log4j>
        <dep.ver.slf4j-log4j12>1.7.5</dep.ver.slf4j-log4j12>
        <dep.ver.logback-ext-spring>0.1.2</dep.ver.logback-ext-spring>
        <dep.ver.dubbo>2.5.3</dep.ver.dubbo>
        <dep.ver.zookeeper>3.4.8</dep.ver.zookeeper>
        <dep.ver.zkclient>0.8</dep.ver.zkclient>
        <dep.ver.commons-lang3>3.1</dep.ver.commons-lang3>
        <dep.ver.jackson>1.9.12</dep.ver.jackson>
        <dep.ver.shiro>1.2.3</dep.ver.shiro>
        <dep.ver.freemarker>2.3.22</dep.ver.freemarker>
        <dep.ver.commons-beanutils>1.9.2</dep.ver.commons-beanutils>
        <dep.ver.junit>4.11</dep.ver.junit>
        <dep.ver.mockito>1.10.19</dep.ver.mockito>
        <dep.ver.joda-time>2.9.3</dep.ver.joda-time>
        <dep.ver.commons-collections4>4.1</dep.ver.commons-collections4>
        <dep.ver.httpclient>4.5.2</dep.ver.httpclient>

        <dep.ver.fastjson>1.2.11</dep.ver.fastjson>

        <plg.ver.maven-resources-plugin>2.7</plg.ver.maven-resources-plugin>
        <plg.ver.maven-compiler-plugin>2.5.1</plg.ver.maven-compiler-plugin>
        <plg.ver.maven-source-plugin>3.0.0</plg.ver.maven-source-plugin>
        <plg.ver.lombok-maven-plugin>1.14.8.0</plg.ver.lombok-maven-plugin>

        <jdk.ver>1.8</jdk.ver>
        <encoding>UTF-8</encoding>
        <center.project.name>${project.artifactId}</center.project.name>
        <profiles.dir>src/profiles</profiles.dir>
        <jackson.version>2.6.0</jackson.version>
  </properties>
  <modules>
      <module>student-service</module>
      <module>student-api</module>
      <module>student-web</module>
  </modules>

  <dependencies>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>5.2.4.Final</version>
        </dependency>
    </dependencies>

  <dependencyManagement>
        <dependencies>
            <!-- spring -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>${dep.ver.springframework}</version>
                <exclusions>
                    <exclusion>
                        <groupId>commons-logging</groupId>
                        <artifactId>commons-logging</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${dep.ver.springframework}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context-support</artifactId>
                <version>${dep.ver.springframework}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
                <version>${dep.ver.springframework}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${dep.ver.springframework}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>${dep.ver.springframework}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>${dep.ver.springframework}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aspects</artifactId>
                <version>${dep.ver.springframework}</version>
            </dependency>
            <!-- spring -->
            <!-- db -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${dep.ver.druid}</version>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${dep.ver.mysql}</version>
            </dependency>
            <!-- db -->
            <!-- mybatis -->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>${dep.ver.mybatis}</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>${dep.ver.mybatis-spring}</version>
            </dependency>
            <dependency>
                <groupId>com.github.pagehelper</groupId>
                <artifactId>pagehelper</artifactId>
                <version>${dep.ver.pagehelper}</version>
            </dependency>
            <!-- mybatis -->
            <!-- apache -->
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>${dep.ver.commons-lang3}</version>
            </dependency>
            <!-- apache -->
            <!-- commons-beanutils -->
            <dependency>
                <groupId>commons-beanutils</groupId>
                <artifactId>commons-beanutils</artifactId>
                <version>${dep.ver.commons-beanutils}</version>
                <exclusions>
                    <exclusion>
                        <groupId>commons-logging</groupId>
                        <artifactId>commons-logging</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <!-- commons-beanutils -->
            <!-- log -->
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>${dep.ver.slf4j}</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>log4j-over-slf4j</artifactId>
                <version>${dep.ver.slf4j}</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>jcl-over-slf4j</artifactId>
                <version>${dep.ver.slf4j}</version>
            </dependency>
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-classic</artifactId>
                <version>${dep.ver.logback}</version>
            </dependency>
            <!-- log -->
            <!-- dubbo -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>dubbo</artifactId>
                <version>${dep.ver.dubbo}</version>
                <exclusions>
                    <exclusion>
                        <artifactId>spring</artifactId>
                        <groupId>org.springframework</groupId>
                    </exclusion>
                    <exclusion>
                        <artifactId>netty</artifactId>
                        <groupId>org.jboss.netty</groupId>
                    </exclusion>
                </exclusions>
            </dependency>
            <!-- dubbo -->
            <!-- zookeeper -->
            <dependency>
                <groupId>org.apache.zookeeper</groupId>
                <artifactId>zookeeper</artifactId>
                <version>${dep.ver.zookeeper}</version>
                <exclusions>
                    <exclusion>
                        <groupId>log4j</groupId>
                        <artifactId>log4j</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>com.101tec</groupId>
                <artifactId>zkclient</artifactId>
                <version>${dep.ver.zkclient}</version>
                <exclusions>
                    <exclusion>
                        <groupId>log4j</groupId>
                        <artifactId>log4j</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <!-- zookeeper -->
            <!-- jackson -->
            <dependency>
                <groupId>org.codehaus.jackson</groupId>
                <artifactId>jackson-core-asl</artifactId>
                <version>${dep.ver.jackson}</version>
            </dependency>
            <dependency>
                <groupId>org.codehaus.jackson</groupId>
                <artifactId>jackson-mapper-asl</artifactId>
                <version>${dep.ver.jackson}</version>
            </dependency>
            <!-- jackson -->
            <!-- aspectj -->
            <dependency>
                <groupId>aspectj</groupId>
                <artifactId>aspectjrt</artifactId>
                <version>${dep.ver.aspectjrt}</version>
            </dependency>
            <dependency>
                <groupId>org.aspectj</groupId>
                <artifactId>aspectjweaver</artifactId>
                <version>${dep.ver.aspectjweaver}</version>
            </dependency>
            <!-- aspectj -->
            <!-- servlet -->
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>${dep.ver.servlet}</version>
                <scope>provided</scope>
            </dependency>
            <!-- servlet -->
            <!-- javassist -->
            <dependency>
                <groupId>org.javassist</groupId>
                <artifactId>javassist</artifactId>
                <version>${dep.ver.javassist}</version>
            </dependency>
            <!-- javassist -->
            <!-- test start -->
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>${dep.ver.junit}</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>${dep.ver.springframework}</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.mockito</groupId>
                <artifactId>mockito-core</artifactId>
                <version>${dep.ver.mockito}</version>
                <scope>test</scope>
            </dependency>
            <!-- test end -->
            <!-- google -->
            <dependency>
                <groupId>com.google.code.gson</groupId>
                <artifactId>gson</artifactId>
                <version>${dep.ver.gson}</version>
            </dependency>
            <dependency>
                <groupId>com.google.guava</groupId>
                <artifactId>guava</artifactId>
                <version>${dep.ver.guava}</version>
            </dependency>
            <!-- google -->
            <!-- lombok -->
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${dep.ver.lombok}</version>
            </dependency>
            <!-- lombok -->
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-collections4</artifactId>
                <version>${dep.ver.commons-collections4}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.httpcomponents</groupId>
                <artifactId>httpclient</artifactId>
                <version>${dep.ver.httpclient}</version>
                <exclusions>
                    <exclusion>
                        <groupId>commons-logging</groupId>
                        <artifactId>commons-logging</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
        </dependencies>
    </dependencyManagement>

  <profiles>
        <profile>
            <id>local</id>
            <build>
                <resources>
                    <resource>
                        <directory>${profiles.dir}/local</directory>
                    </resource>
                </resources>
            </build>
        </profile>

        <profile>
            <id>dev</id>
            <build>
                <resources>
                    <resource>
                        <directory>${profiles.dir}/dev</directory>
                    </resource>
                </resources>
            </build>
        </profile>
    </profiles>

    <build>
        <finalName>${center.project.name}</finalName>

        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>${plg.ver.maven-resources-plugin}</version>
                <configuration>
                    <encoding>${encoding}</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>${plg.ver.maven-compiler-plugin}</version>
                <configuration>
                    <source>${jdk.ver}</source>
                    <target>${jdk.ver}</target>
                    <encoding>${encoding}</encoding>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-source-plugin</artifactId>
                <version>${plg.ver.maven-source-plugin}</version>
                <configuration>
                    <attach>true</attach>
                </configuration>
                <executions>
                    <execution>
                        <phase>compile</phase>
                        <goals>
                            <goal>jar</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>
</project>

 

在student-api中繼承父pom的依賴，而且直接引入。

 

<?xml version="1.0"?>
<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"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.student.demo</groupId>
    <artifactId>student-demo</artifactId>
    <version>1.0.0-SNAPSHOT</version>
  </parent>
  <artifactId>student-api</artifactId>

 <dependencies>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${dep.ver.fastjson}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
        </dependency>
        <!-- google -->
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
        </dependency>
        <!-- google -->

    </dependencies>
</project>

 

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

 

<?xml version="1.0"?>
<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"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.student.demo</groupId>
    <artifactId>student-demo</artifactId>
    <version>1.0.0-SNAPSHOT</version>
  </parent>
  <artifactId>student-service</artifactId>

  <dependencies>
        <dependency>
            <groupId>com.student.demo</groupId>
            <artifactId>student-api</artifactId>
            <version>1.0.0-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${dep.ver.fastjson}</version>
        </dependency>

        <!-- oss相關依賴 -->
        <dependency>
            <groupId>com.aliyun.oss</groupId>
            <artifactId>aliyun-sdk-oss</artifactId>
            <version>2.0.7</version>
            <exclusions>
                <exclusion>
                    <groupId>commons-logging</groupId>
                    <artifactId>commons-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- oss相關依賴 結束 -->

        <!-- db -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!-- db -->

        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
        </dependency>
        <!-- mybatis -->

        <!-- spring配置 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
        </dependency>
        <!-- spring配置 -->

        <!-- jackson -->
        <!-- <dependency> -->
        <!-- <groupId>org.codehaus.jackson</groupId> -->
        <!-- <artifactId>jackson-core-asl</artifactId> -->
        <!-- </dependency> -->
        <!-- <dependency> -->
        <!-- <groupId>org.codehaus.jackson</groupId> -->
        <!-- <artifactId>jackson-mapper-asl</artifactId> -->
        <!-- </dependency> -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <!-- jackson -->

        <!-- log -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>log4j-over-slf4j</artifactId>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
        </dependency>
        <!-- log -->

        <!-- google -->
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
        </dependency>
        <!-- <dependency> -->
        <!-- <groupId>com.google.code.gson</groupId> -->
        <!-- <artifactId>gson</artifactId> -->
        <!-- </dependency> -->
        <!-- google -->

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>

        <dependency>
            <groupId>commons-beanutils</groupId>
            <artifactId>commons-beanutils</artifactId>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
        </dependency>

        <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
        </dependency>

        <!-- aspectj -->
        <dependency>
            <groupId>aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
        </dependency>
        <!-- aspectj -->

        <!-- dubbo -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>spring</artifactId>
                    <groupId>org.springframework</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>netty</artifactId>
                    <groupId>org.jboss.netty</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- dubbo -->

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
        </dependency>

        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib</artifactId>
            <version>3.1</version>
        </dependency>
    </dependencies>
</project>

 

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>

 

<?xml version="1.0"?>
<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"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.student.demo</groupId>
    <artifactId>student-demo</artifactId>
    <version>1.0.0-SNAPSHOT</version>
  </parent>
  <artifactId>student-web</artifactId>
  <packaging>war</packaging>
  <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>

        <dependency>
            <groupId>com.student.demo</groupId>
            <artifactId>student-api</artifactId>
            <version>1.0.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.student.demo</groupId>
            <artifactId>student-service</artifactId>
            <version>1.0.0-SNAPSHOT</version>
        </dependency>
    </dependencies>
  <build>
    <finalName>student-web</finalName>
  </build>
</project>

 

　　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>

 

　　   一樣DispatcherServlet會從classpath:spring/spring-dispatcher.xml加載它的bean。

 

<?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:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="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://www.springframework.org/schema/mvc
                        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <mvc:annotation-driven>
        <mvc:message-converters>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter " />
        </mvc:message-converters>
    </mvc:annotation-driven>

    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
    <!-- 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 -->
</beans>

 

　　　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

 

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    id="schedule-console" version="3.0">
    <display-name>student-web</display-name>

    <!-- web.xml中加載順序是 context-param -> listener -> filter -> servlet -->
    <!-- spring基礎配置文件位置 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring/spring-base.xml</param-value>
    </context-param>

    <!-- Spring監聽 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- 設置servlet編碼開始 -->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!-- 設置servlet編碼結束 -->
    <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>
</web-app>

 

　　　　　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：

 

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

    <!-- 採用druid做爲鏈接池 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
        init-method="init" destroy-method="close">
        <!-- 基本屬性 url、user、password -->
        <property name="driverClassName" value="${database.driverClassName}" />
        <property name="url" value="${database.url}" />
        <property name="username" value="${database.user}" />
        <property name="password" value="${database.password}" />

        <!-- 配置初始化大小、最小、最大 -->
        <property name="initialSize" value="1" />
        <property name="minIdle" value="1" />
        <property name="maxActive" value="20" />

        <!-- 配置獲取鏈接等待超時的時間 -->
        <property name="maxWait" value="60000" />

        <!-- 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 -->
        <property name="timeBetweenEvictionRunsMillis" value="60000" />

        <!-- 配置一個鏈接在池中最小生存的時間，單位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="300000" />
        <property name="validationQuery" value="SELECT 'x'" />
        <property name="testWhileIdle" value="true" />
        <property name="testOnBorrow" value="false" />
        <property name="testOnReturn" value="false" />

        <!-- 打開PSCache，而且指定每一個鏈接上PSCache的大小 -->
        <property name="poolPreparedStatements" value="true" />
        <property name="maxPoolPreparedStatementPerConnectionSize"
            value="20" />

        <!-- 配置監控統計攔截的filters -->
        <property name="filters" value="stat" />
    </bean>

    <!-- 配置mybatis的sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="configLocation" value="classpath:mybatis/mybatis.xml" />
        <property name="mapperLocations" value="classpath:mybatis/mapper/*.xml" />
    </bean>

    <!-- mybatis mapper接口掃描 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="org.student.service.mapper" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
    </bean>

    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 開啓@Transactional事務註解 -->
    <tx:annotation-driven transaction-manager="transactionManager" />
</beans>

 

 　　　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>

 

　　　　　2.寫一個簡單的服務接口

　　　　　1）首先在student-service中創建Student實體類

 

package org.student.bean;

public class Student {
    private Long id;
    private String name;
    private Integer age;
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }

}

 

　　　　　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。

 

package org.student.api.dto;

import java.io.Serializable;

public class StudentDTO implements Serializable{

    private static final long serialVersionUID = 1L;
    private Long id;
    private String name;
    private Integer age;
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "id = " + id + ", name = " + name + ",age = " + age;
    }
}

 

　　　　　3）在student-api中創建StudentApi接口，值得注意的是@service註解中的對象

 

package org.student.api;

import java.util.List;

import org.student.api.dto.StudentDTO;

public interface StudentApi {
    List<StudentDTO> listStudents();
}

 

 　　　　　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

 

package org.student.service.biz;

import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.student.api.StudentApi;
import org.student.api.dto.StudentDTO;
import org.student.bean.Student;
import org.student.service.StudentService;

import com.google.common.collect.Lists;

@Service("studentApi")
public class StudentBiz implements StudentApi{
    private Logger logger = LoggerFactory.getLogger(StudentBiz.class);

    @Autowired
    private StudentService studentService;

    @Override
    public List<StudentDTO> listStudents() {
        List<Student> listStudent = studentService.listStudent();
        List<StudentDTO> listStudentDTO = Lists.newArrayList();
        for(Student student: listStudent){
            StudentDTO studentDTO = new StudentDTO();
            studentDTO.setId(student.getId());
            studentDTO.setAge(student.getAge());
            studentDTO.setName(student.getName());
            listStudentDTO.add(studentDTO);
        }
        return listStudentDTO;
    }
}

 

　　　　　6）在student-service中建立service層接口StudentService

 

package org.student.service;

import java.util.List;

import org.springframework.stereotype.Service;
import org.student.bean.Student;

@Service
public interface StudentService {

    List<Student> listStudent();

}

 

　　　7）在student-service中實現StudentService接口

 

package org.student.service.impl;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;
import org.student.bean.Student;
import org.student.service.StudentService;
import org.student.service.mapper.StudentMapper;

@Service("studentService")
public class StudentServiceImpl implements StudentService{

    @Resource
    private StudentMapper studentMapper;

    @Override
    public List<Student> listStudent() {
        List<Student> listStudent = studentMapper.listStudent();
        return listStudent;
    }

}

 

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

 

package org.student.service.mapper;

import java.util.List;

import org.student.bean.Student;

public interface StudentMapper {
    List<Student> listStudent();
}

 

　　　　　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

 

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="org.student.service.mapper.StudentMapper">
    <!--查詢字段-->
    <sql id="columns">
        a.id,
        a.name,
        a.age
    </sql>

    <!--查詢結果集-->
    <resultMap id="beanMap" type="org.student.bean.Student">
        <result property="id" column="id"/>
        <result property="name" column="name"/>
        <result property="age" column="age"/>
    </resultMap>


    <!--根據主鍵獲取實體-->
    <select id="listStudent" resultMap="beanMap">
        SELECT
        <include refid="columns"/>
        FROM
        student a
    </select>

</mapper>

 

　　　　　dubbo提供者已建立完成，建立完成子應用結構爲

　　　

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>

student-registry-address=172.0.0.1:2181
student-service-group=student-min
student-service-version=1.0.0
student-service-timeout=120000

 

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

<?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">

    <dubbo:application name="consumer-student-test" />

    <dubbo:registry address="${student-registry-address}" protocol="zookeeper" />


    <dubbo:reference id="studentApi" interface="org.student.api.StudentApi"
        group="${student-service-group}" version="${student-service-version}"
        check="false" />

</beans>

 

3）調用者的controller層　

package org.student.controller;

import javax.annotation.Resource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.student.api.StudentApi;

@RestController
@RequestMapping("/student")
public class StudentController {
    private static Logger logger = LoggerFactory.getLogger(StudentController.class);

    @Resource
    private StudentApi studentApi;

    @RequestMapping(path = "/listStudent", method = RequestMethod.POST)
    public void listStudent(){
        logger.info("get students...");
        logger.info("the data are " + studentApi.listStudents());
    }
}

 

4）服務器同時啓動provider和consumer，會看到啓動信息

　　　　　　　

<span style="white-space:pre">    </span>查看zookeeper註冊中心發現提供者消費者都已成功註冊

<span style="white-space:pre">    </span><img src="https://img-blog.csdn.net/20161110162252922?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" width="800" height="30" alt="" />

<span style="white-space:pre">    </span><img src="https://img-blog.csdn.net/20161110162424347?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" width="800" height="90" alt="" />

　　　　　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
://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

版權聲明：本文爲博主原創文章，未經博主容許不得轉載。 https://blog.csdn.net/u013098329/article/details/53116084

文章標籤： spring分佈式spring mvcdubbomaven

我的分類： DobboMavenspringMVC