本文讲解使用Maven单模块方式进行Spring MVC+Spring+MyBatis整合。为了把整合步骤体现地更加清晰，我们可以把步骤分为以下六个部分：
- 准备数据库环境
- 单独搭建Spring环境
- 单独搭建Spring MVC环境
- Spring整合Spring MVC
- 单独搭建MyBatis环境
- MyBatis整合Spring
1 准备数据库环境
1.1 创建ssm数据库
1.2 建立测试表
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(32) NOT NULL COMMENT '用户名称',
`birthday` datetime DEFAULT NULL COMMENT '生日',
`sex` char(1) DEFAULT NULL COMMENT '性别',
`address` varchar(256) DEFAULT NULL COMMENT '地址',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=49 DEFAULT CHARSET=utf8
1.3 插入测试数据
2 单独搭建Spring环境
2.1 创建Web项目
2.2 导入SSM相关依赖
<?xml version="1.0" encoding="UTF-8"?>
<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.yiidian</groupId>
<artifactId>ch04_04_springmvc_ssm</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<!--
SSM整合的基础依赖
-->
<!-- 1.spring相关的依赖 -->
<dependencies>
<!-- 1.1 ioc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!--1.2 aop -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.7</version>
</dependency>
<!-- 1.3 声明式事务-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- 1.4 test -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!-- 2. mybatis相关依赖 -->
<!-- 2.1 mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.46</version>
</dependency>
<!-- 2.2 数据源 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.6</version>
</dependency>
<!-- 2.3 mybatis核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<!-- 3. springmvc相关依赖-->
<!-- 3.1 springmvc核心包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!--3.2 servlet依赖 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<!--3.3 jstl标签库-->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- 4. log4j日志 -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- 5. spring与mybatis整合包 *** -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
</dependencies>
</project>
2.3 设计Pojo
package com.yiidian.domain;
import java.util.Date;
/**
* 实体类
* 一点教程网 - www.yiidian.com
*/
public class User {
private Integer id;
private String username;
private Date birthday;
private String sex;
private String address;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", birthday=" + birthday +
", sex='" + sex + '\'' +
", address='" + address + '\'' +
'}';
}
}
2.3 编写业务接口和实现
UserService接口：
package com.yiidian.service;
import com.yiidian.domain.User;
import java.util.List;
/**
* 业务层接口
* 一点教程网 - www.yiidian.com
*/
public interface UserService {
/**
* 查询所有用户
*/
public List<User> findAll();
}
UserService实现类：
package com.yiidian.service.impl;
import com.yiidian.domain.User;
import com.yiidian.service.UserService;
import org.springframework.stereotype.Service;
import java.util.List;
/**
*业务层实现类
* 一点教程网 - www.yiidian.com
*/
@Service
public class UserServiceImpl implements UserService{
@Override
public List<User> findAll() {
System.out.println("查询所有用户...");
return null;
}
}
这里给业务实现类加入@Service注解，目的是把该对象放入Spring IOC容器。
2.4 编写Spring配置
内容如下：
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--扫描Service实现类-->
<context:component-scan base-package="com.yiidian.service"/>
</beans>
2.5 编写Spring环境测试类
内容如下：
package com.yiidian.test;
import com.yiidian.service.UserService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
/**
* 单独测试Spring环境是否OK
* 一点教程网 - www.yiidian.com
*/
@RunWith(SpringJUnit4ClassRunner.class) // 加载Spring环境
@ContextConfiguration("classpath:applicationContext.xml") //读取spring配置，创建IOC容器
public class TestSpring {
//注入service对象
@Autowired
private UserService userService;
@Test
public void testFindAll(){
userService.findAll();
}
}
2.6 运行测试类
3 单独搭建Spring MVC环境
3.1 Spring MVC核心控制器
<?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_2_5.xsd"
version="2.5">
<!-- 配置核心控制器 -->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
3.2 springmvc.xml配置
内容如下：
<?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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 1.扫描控制器 -->
<context:component-scan base-package="com.yiidian.controller"/>
<!-- 2.视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!-- 3.创建处理器映射器和处理器适配器 -->
<mvc:annotation-driven/>
</beans>
3.3 编写UserController
package com.yiidian.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
/**
* 控制器
* 一点教程网 - www.yiidian.com
*/
@Controller
@RequestMapping("/user")
public class UserController {
/**
* 查询所有用户
*/
@RequestMapping("/list")
public String list(Model model){
//存入数据到request域
model.addAttribute("list","用户数据");
//返回list.jsp页面
return "list";
}
}
3.4 编写list.jsp，显示数据
内容如下：
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>一点教程网-显示用户数据</title>
</head>
<body>
${list}
</body>
</html>
3.5 项目部署到Tomcat
访问Controller：http://localhost:8080/user/list，显示效果如下：
4 Spring整合Spring MVC
4.1 配置Spring监听器
Spring和Spring MVC融合使用，非常简单，只要在web.xml配置监听器，在项目启动的时候，加载applicationContext.xml文件，把Spring环境启动即可。
<!-- 配置spring监听器，用于加载applicationContext.xml（初始化SpringIOC容器） -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
4.2 在控制层调用业务层
package com.yiidian.controller;
import com.yiidian.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
/**
* 控制器
* 一点教程网 - www.yiidian.com
*/
@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
/**
* 查询所有用户
*/
@RequestMapping("/list")
public String list(Model model){
//调用业务层方法
userService.findAll();
//存入数据到request域
model.addAttribute("list","用户数据");
//返回list.jsp页面
return "list";
}
}
如果Controller成功注入Service，代表Spring与Spring MVC整合成功！
4.3 测试
5 单独搭建MyBatis环境
5.1 编写UserDao接口
package com.yiidian.dao;
import com.yiidian.domain.User;
import org.apache.ibatis.annotations.Select;
import java.util.List;
/**
* Dao接口
*/
public interface UserDao {
/**
* 查询所有账户
*/
@Select("select * from user")
public List<User> findAll();
}
5.2 编写SqlMapConfig.xml
该文件是MyBatis核心配置，里面配置数据源及Dao接口映射等信息。
内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 读取jdbc.properties -->
<properties resource="jdbc.properties"/>
<!--1.别名扫描 -->
<typeAliases>
<package name="com.yiidian.domain"/>
</typeAliases>
<!--2.数据库连接 -->
<environments default="mysql">
<environment id="mysql">
<transactionManager type="jdbc"></transactionManager>
<dataSource type="pooled">
<property name="url" value="${jdbc.url}"/>
<property name="driver" value="${jdbc.driver}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</dataSource>
</environment>
</environments>
<!--3.映射关联 -->
<mappers>
<package name="com.yiidian.dao"/>
</mappers>
</configuration>
jdbc.properties:
内容如下：
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf8
jdbc.username=root
jdbc.password=root
jdbc.initialSize=3
jdbc.maxActive=10
5.3 编写MyBatis测试类
内容如下：
package com.yiidian.test;
import com.yiidian.dao.UserDao;
import com.yiidian.domain.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
* 单独测试MyBatis环境是否OK
*一点教程网 - www.yiidian.com
*/
public class TestMyBatis {
@Test
public void testFindAll() throws IOException {
//1.加载SqlMapConfig.xml
InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
//2.创建SqlSessionFactory
SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
SqlSessionFactory factory = builder.build(in);
//3.创建SqlSession
SqlSession sqlSession = factory.openSession();
//4.创建Dao代理对象
UserDao accountDao = sqlSession.getMapper(UserDao.class);
//5.执行方法
List<User> list = accountDao.findAll();
System.out.println(list);
//6.释放资源
sqlSession.close();
in.close();
}
}
5.4 运行测试类
6 MyBatis整合Spring
MyBatis整合Spring是SSM整合最关键的一步！毕竟MyBatis和Spring是两个不同框架。整合的思路是：Spring依赖IOC容器创建MyBatis所需要的SqlSessionFactory，从利用SqlSessionFactory完成Dao层的操作。我们来具体步骤：
6.1 MyBatis整合Spring配置
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--扫描Service实现类-->
<context:component-scan base-package="com.yiidian.service"/>
<!-- 1. 创建数据源 -->
<context:property-placeholder location="classpath:jdbc.properties"/>
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="url" value="${jdbc.url}"/>
<property name="driverClassName" value="${jdbc.driver}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!-- 2. 为了创建Dao代理对象，先创建SqlSessionFactory对象 -->
<!-- SqlSessionFactoryBean: 创建SqlSessionFactory对象的工具 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 注入数据源 -->
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 3. 扫描Dao接口所在包，扫描后用于创建Dao代理对象，把代理对象放入IOC容器 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- Dao扫描目录 -->
<property name="basePackage" value="com.yiidian.dao"/>
</bean>
</beans>
因为Spring已经把之前MyBatis的数据源及Dao映射等信息都集成了，所以MyBatis的SqlMapConfig.xml已经不需要啦，可以删除。
6.2 业务层注入持久层对象
上面的配置已经成功地让MyBatis和Spring完成整合。接着，我们可以在Service层注入Dao对象，调用其方法：
package com.yiidian.service.impl;
import com.yiidian.dao.UserDao;
import com.yiidian.domain.User;
import com.yiidian.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
*业务层实现类
* 一点教程网 - www.yiidian.com
*/
@Service
public class UserServiceImpl implements UserService{
//注入Dao对象
@Autowired
private UserDao userDao;
@Override
public List<User> findAll() {
return userDao.findAll();
}
}
6.3 编写测试类
内容如下：
package com.yiidian.test;
import com.yiidian.service.UserService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
/**
* 测试Spring与MyBatis环境是否OK
* 一点教程网 - www.yiidian.com
*/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(value = "classpath:applicationContext.xml")
public class TestSpringMyBatis {
//从IOC容器中获取业务实现
@Autowired
private UserService userService;
@Test
public void testFindAll(){
System.out.println( userService.findAll());
}
}
6.4 运行测试
至此，SSM框架已经整合完成。剩下就是把数据显示到JSP页面上。
6.5 修改UserController类
package com.yiidian.controller;
import com.yiidian.domain.User;
import com.yiidian.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
/**
* 控制器
* 一点教程网 - www.yiidian.com
*/
@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
/**
* 查询所有用户
*/
@RequestMapping("/list")
public String list(Model model){
//调用业务层方法
List<User> list = userService.findAll();
//存入数据到request域
model.addAttribute("list",list);
//返回list.jsp页面
return "list";
}
}
6.6 修改JSP页面显示内容
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>一点教程网-显示用户数据</title>
</head>
<body>
<h3>用户列表</h3>
| 编号|用户名|生日|性别|地址|
| :-----: | :-----: | :-----: | :-----: | :-----: |
| 编号 | 用户名 | 生日 | 性别 | 地址 |
| ${user.id} | ${user.username} | ${user.birthday} | ${user.sex} | ${user.address} |
</body>
</html>
6.7 最终显示效果如下
