因爲本人愚鈍,整合ssm框架真是費勁了全身的力氣,因此打算寫下這篇文章,一來是對整個過程進行一個回顧,二來是方便有像我同樣的笨鳥看過這篇文章後對其有所幫助,若是本文中有不對的地方,也請大神們指教。java
1、代碼結構mysql
整個項目的代碼結構如圖所示:
controller爲控制層,主要用於對業務模塊的流程控制。
dao爲數據接入層,主要用於與數據庫進行鏈接,訪問數據庫進行操做,這裏定義了各類操做數據庫的接口。
mapper中存放mybatis的數據庫映射配置。能夠經過查看mybatis相關教程瞭解
model中存放了咱們的實體類
service爲業務層,咱們的各類業務都定義在此,由controller調用不一樣業務實現不一樣的操做。web
因爲以前搭建環境都是本身配置依賴環境,致使缺各類缺包或者依賴衝突,因此此次我使用了maven來管理項目,能夠上網查一下相關的教程,使用起來很是方便。
下面是個人pom.xml文件的配置spring
<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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.mjl</groupId> <artifactId>testssm</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>testssm Maven Webapp</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <spring.version>4.1.4.RELEASE</spring.version> <jackson.version>2.5.0</jackson.version> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <!-- spring配置 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> <scope>test</scope> </dependency> <!-- mybatis 包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.8</version> </dependency> <!--mybatis spring 插件 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> <!-- mysql鏈接 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.34</version> </dependency> <!-- 數據源 --> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5-pre8</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.4</version> </dependency> <!-- log4j --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <!-- servlet --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>3.0-alpha-1</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <!-- json --> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> <version>1.9.13</version> </dependency> <!-- 文件上傳 --> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.2.2</version> </dependency> </dependencies> <build> <finalName>testssm</finalName> </build> </project>
下面進入主題,直接上代碼,我以前是先看了各類原理,可是看了半天也沒明白,因此你們能夠先把項目跑起來,而後再去對照springmvc的各個模塊進行分析,哪一個模塊執行哪一個操做,我認爲這樣的效果比較好。sql
我我的喜歡先從數據庫與ORM框架與spirng開始搭建,這樣的話在一開始就能夠對ORM框架進行檢驗,省得在最後檢驗的時候出了問題。數據庫
先看web.xml的配置apache
1 <?xml version="1.0" encoding="utf-8"?> 2 <web-app xmlns="http://java.sun.com/xml/ns/j2ee" version="2.4" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 3 xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> 4 <!-- Spring配置 --> 5 <!-- 配置Spring配置文件路徑,好讓ContextLoaderListener對其加載與解析--> 6 <context-param> 7 <param-name>contextConfigLocation</param-name> 8 <param-value> 9 classpath*:config/applicationContext.xml 10 </param-value> 11 </context-param> 12 <!-- 配置Spring上下文監聽器,它的做用就是在啓動WEB容器時,就會自動裝在咱們applicationContext.xml配置--> 13 <listener> 14 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 15 </listener> 16 <!-- 配置Spring字符編碼過濾器 --> 17 <filter> 18 <filter-name>encodingFilter</filter-name> 19 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> 20 <init-param> 21 <param-name>encoding</param-name> 22 <param-value>UTF-8</param-value> 23 </init-param> 24 <init-param> 25 <param-name>forceEncoding</param-name> 26 <param-value>true</param-value> 27 </init-param> 28 </filter> 29 <filter-mapping> 30 <filter-name>encodingFilter</filter-name> 31 <url-pattern>/*</url-pattern> 32 </filter-mapping> 33 </web-app>
配置完web.xml後,配置spring的applicationContext.xml,它是spring的配置文件,通常與spring集成的框架都要在這裏進行配置。編程
<?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" 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.xsd"> <!--引入jdbc配置 --> <context:property-placeholder location="classpath*:config/jdbc.properties"/> <!-- 掃描文件(自動將service層注入)--> <context:component-scan base-package="com.mjl.service"/> <!--配置數據源--> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc_driverClassName}"/> <property name="jdbcUrl" value="${jdbc_url}"/> <property name="user" value="${jdbc_username}"/> <property name="password" value="${jdbc_password}"/> <!--鏈接池中保存的最大鏈接數目--> <property name="maxPoolSize" value="20"/> <!--鏈接池中保存的最少鏈接數目--> <property name="minPoolSize" value="2"/> <!-- 初始化鏈接大小 --> <property name="initialPoolSize" value="2"/> <!-- 獲取鏈接最大等待時間 --> <property name="maxConnectionAge" value="6000"/> <!-- 鏈接池最大空閒 --> <property name="maxIdleTime" value="60"/> </bean> <!--配置sqlSessionFactory 並將數據源注入--> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--注入數據源--> <property name="dataSource" ref="dataSource"/> <!--指定要使用到到mybatis配置文件--> <property name="configLocation" value="classpath:config/config.xml"/> <!--用於配置mapper映射xml--> <property name="mapperLocations" value="classpath*:com/mjl/mapper/*.xml"/> </bean> <!-- 建立數據映射器--> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.mjl.dao"/> </bean> <!-- 對數據源進行事務管理 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> </beans>
在這裏使用了jdbc.properties來分散配置,jdbc.properties中保存了數據庫的信息,須要根據大家的數據庫配置進行修改。json
jdbc.propertiesapi
1 jdbc_driverClassName=com.mysql.jdbc.Driver 2 jdbc_url=jdbc:mysql://localhost:3307/db_ssm?useUnicode=true&characterEncoding=utf-8 3 jdbc_username=root 4 jdbc_password=1234
而後是爭對mybatis進行配置,因爲我把數據庫配置都配置在applicationcontext.xml中,因此我對mybatis中只進行了別名配置。
config.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!--爲com.mjl.model.User設置別名 User 方便調用--> <typeAliases> <typeAlias alias="User" type="com.mjl.model.User"/> </typeAliases> </configuration>
配置完後,就開始進行數據庫開發了,因爲是一個簡單的登陸功能的實現,因此數據庫也很是簡單。
1 create database if not exists db_ssm character set utf8; 2 use db_ssm; 3 create table tb_user( 4 id int(10) auto_increment, 5 username varchar(20) not null, 6 password varchar(20) not null, 7 primary key (id) 8 )ENGINE=InnoDB DEFAULT CHARSET utf8 COLLATE utf8_general_ci; 9 10 insert into tb_user(id,username,password) values(1,'alvin',1234);
建立完數據庫後開始寫model下面的實體類
User.java
package com.mjl.model; /** * Created by alvin on 15/9/7. */ public class User { private int id; private String username; private String password; public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } }
數據庫接入層dao的接口,在這裏我使用了mybatis以接口方式編程,這部分借鑑了其餘的教程,有不懂的地方能夠查看http://www.yihaomen.com/article/java/302.htm 該網址的mybatis教程,我以爲寫的很不錯。
1 package com.mjl.dao; 2 3 import com.mjl.model.User; 4 5 /** 6 * Created by alvin on 15/9/7. 7 * 此類爲接口模式下的配置 8 */ 9 10 public interface IUserDao { 11 //這裏以接口形式定義了數據庫操做方法,咱們只需 12 // 在Mybatis映射文件中對其進行映射就能夠直接使用 13 public User selectById(int id); 14 public User selectByName(String username); 15 }
mybatis映射文件文件名必須與接口類相同,不然沒法映射成功。
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 3 "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 4 5 <!--namespace用於與DAO層的接口類進行綁定,這樣咱們無需實現DAO層的接口 6 類,其接口類就可以自動的找到相關的SQL語句進行綁定實現--> 7 <mapper namespace="com.mjl.dao.IUserDao"> 8 <!--select表示查詢,它的id名稱必須與DAO層接口的方法名相同,不然沒法綁定--> 9 <select id="selectByName" parameterType="string" resultType="User"> 10 select * from tb_user where username = #{username} 11 </select> 12 13 <select id="selectById" parameterType="int" resultType="User"> 14 15 select * from tb_user where id = #{id} 16 </select> 17 18 19 </mapper>
好了,到這裏mybatis與spring已經整合完畢,咱們須要測試一下mybatis是否與spring整合成功,寫一個test類
1 package com.mjl.test; 2 3 import com.mjl.dao.IUserDao; 4 5 6 import com.mjl.model.User; 7 import org.springframework.context.ApplicationContext; 8 import org.springframework.context.support.ClassPathXmlApplicationContext; 9 10 11 /** 12 * Created by Alvin on 15/9/6. 13 */ 14 public class Test { 15 private static ApplicationContext ac; 16 static { 17 ac = new ClassPathXmlApplicationContext("config/applicationContext.xml"); 18 } 19 20 public static void main(String[] args) { 21 IUserDao mapper = (IUserDao) ac.getBean("IUserDao"); 22 System.out.println("獲取alvin"); 23 User user = mapper.selectByName("alvin"); 24 25 System.out.println(user.getId()+":"+"username:"+user.getUsername()); 26 System.out.println("password:"+user.getPassword()); 27 28 } 29 }
若是成功,以下圖所示:
到這裏mybatis與spring就整合結束了,明天繼續更新下半部分。