林炳文Evankaka原创作品。转载请注明出处http://blog.csdn.net/evankaka

本文要实现使用Mybatis+Spring+Mysql实现一个Web项目的整目。在Spring中配置数据源和Mybatis的SqlSessionFactory,然后在Web中的JSP中取得Spring中的bean。通过这个bean来操作Mysql中的表。网上看了好多人有写，但是要么是图没表示清楚，要么是代码没贴完。本文是一个完整的教程，照着做你也可以自己整合！

使用的版本：Mybatis-3.2.8

                        Spring3.2.9

                         Mysql5.6

开发环境：    Eclipse  Java EE Kepler+Win7

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一、创建Web项目并导入包

Eclipse中创建一个Web项目，导入如下的包：

这里一定要注意不能少mybatis-spring-1.2.2.jar这个包，这个包是用来联系Spring和Mybatis的，很重要！！

整个工程目录如下：

二、创建库表映射类并配置MyBatis

1、首先在数据库中创建一张表 t_user

use test;
DROP TABLE IF EXISTS t_user;
create table t_user
(
 userId  int primary key auto_increment,
 userName VARCHAR(50) not null,
 userAge int not null
);

然后插入4条数据：

insert into t_user values(1,‘小王‘,10);
insert into t_user values(2,‘红红‘,11);
insert into t_user values(3,‘明明‘,12);
insert into t_user values(4,‘天天‘,13);

查看下结果：

2、表创建好之后便创建其映射类User，位于包com.mucfc.model中

package com.mucfc.model;
/**
 * User映射类
 * @author linbingwen
 * @time 2015.5.15
 */
public class User {
	private Integer userId;
	private String userName;
	private int userAge;
	public Integer getUserId() {
		return userId;
	}
	public void setUserId(Integer userId) {
		this.userId = userId;
	}
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public int getUserAge() {
		return userAge;
	}
	public void setUserAge(int userAge) {
		this.userAge = userAge;
	}
	@Override
	public String toString() {
		return "User [userId=" + userId + ", userName=" + userName
				+ ", userAge=" + userAge + "]";
	}

}

2、映射类创建好之后便创建MyBatis映射文件（即Mapper文件），位于和src同级的conf的mapper包中，文件内容如下：

<?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="com.mucfc.mapper.UserMapper">
	<!--  查询单条记录  -->
    <select id="selectUserById" parameterType="int" resultType="User">
       select * from t_user where userId = #{userId}
    </select>
</mapper>

3、创建映射UserMapper类如下，位于包com.mucfc.mapper中

package com.mucfc.mapper;

import com.mucfc.model.User;
/**
 * Mapper映射类
 * @author linbingwen
 * @time 2015.5.15
 */
public interface UserMapper {
	public User selectUserById(int userId);

}

4、创建操作数据的DAO层

package com.mucfc.dao;

import com.mucfc.model.User;
/**
 * DAO接口层
 * @author linbingwen
 * @time 2015.5.15
 */
public interface UserDao {
	/**
	 * 根据用户ID查询用户信息
	 * @param id
	 * @return
	 */
	public User findUserById(int id);
}

然后是对应的实现层

package com.mucfc.dao;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import  com.mucfc.mapper.UserMapper;
import com.mucfc.model.User;
/**
 * DAO实现层
 * @author linbingwen
 * @time 2015.5.15
 */
@Component
public class UserDaoImpl implements UserDao{
    @Autowired
	private UserMapper userMapper;
	@Override
	public User findUserById(int id) {
		User user = userMapper.selectUserById(id);
		 return user;
	}

}

5、在conf里配置Mybatis的配置文件：

MyBatisConf.xmll放在conf里，注意路径

<?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>
   <!-- 配置映射类的别名 -->
 	<typeAliases>
      <typeAlias alias="User" type="com.mucfc.model.User"/>
   </typeAliases>
   <!-- 配置Mapper文件的路径 -->
   <mappers>
       <mapper resource="mapper/UserMapper.xml"/>
   </mappers>
</configuration>

如果不与Spring进行整合的话，此配置文件还需要配置数据源信息，与Spring整合之后数据源就配置在Spring配置文件中，只需要配置映射文件的路径就可以了。

三、配置Spring

1、在WEB-INF里配置Spring的配置文件:

SpringConf.xml放在WEB-INF里，注意路径

<?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:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="
           http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-3.0.xsd">
	<!-- 配置数据源 -->
	<bean id="dataSource"
		class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName" value="com.mysql.jdbc.Driver" />
		<property name="url" value="jdbc:mysql://localhost:3306/test" />
		<property name="username" value="root" />
		<property name="password" value="[email protected]" />
	</bean>

	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
	<!-- 	 <property name="mapperLocations" value="conf/mapper/UserMapper.xml"/>  -->
		<property name="configLocation" value="conf/MyBatisConf.xml" />
		<!-- <property name="typeAliasesPackage" value="com.tiantian.ckeditor.model"
			/> -->
	</bean>

	  <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
       <property name="mapperInterface"
           value="com.mucfc.mapper.UserMapper" />
       <property name="sqlSessionFactory" ref="sqlSessionFactory" />
    </bean>
	<!-- 自动扫描注解的bean -->
	<context:component-scan base-package="com.mucfc.dao" />

</beans>

2、web.xml中启动Spring

web.xml放在WEB-INF里

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
	<!-- 配置初始打开的页面 -->
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>

	<!-- Spring 容器加载 -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>/WEB-INF/SpringConf.xml</param-value>
	</context-param>

</web-app>

3、读取bean,进行查找

在index.jsp中设置如下：

index.jsp放置在WebContent中

<%@ page import="com.mucfc.dao.UserDao"%>
<%@page import="org.springframework.web.context.WebApplicationContext"%>
<%@page
	import="org.springframework.web.context.support.WebApplicationContextUtils"%>
<%@ page language="java" contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Insert title here</title>
</head>
<body>
	<center>
		欢迎<br/>
		<%
			WebApplicationContext wac = WebApplicationContextUtils
					.getWebApplicationContext(this.getServletContext());
			UserDao userDao = (UserDao) wac.getBean("userDaoImpl");
		%>
		<%=userDao.findUserById(1)%><br />
		<%=userDao.findUserById(2)%><br />
		<%=userDao.findUserById(3)%><br />
		<%=userDao.findUserById(4)%><br />
	</center>
</body>
</html>

四、运行

1、以run on server运行

2、浏览器输入：http://localhost:8080/MybatisLearningChapter5/

结果如下：

林炳文Evankaka原创作品。转载请注明出处http://blog.csdn.net/evankaka

本文工程免费下载