Mybatis+Spring整合创建Web项目

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

[**本文工程免费下载**][Link 1]

# 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：

![20150515185054921][]

**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：**

![20150515185138882][]

# 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：

![20150515184141775][]

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">	
    	  
        <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>
       
     	<typeAliases>
          <typeAlias alias="User" type="com.mucfc.model.User"/> 
       </typeAliases>  
       
       <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">
    	
    	<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="christmas258@" />
    	</bean>
    
    
    	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    		<property name="dataSource" ref="dataSource" />
    	
    		<property name="configLocation" value="conf/MyBatisConf.xml" />
    		
    	</bean>
    
    	  <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">  
           <property name="mapperInterface"  
               value="com.mucfc.mapper.UserMapper" />  
           <property name="sqlSessionFactory" ref="sqlSessionFactory" />  
        </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">
    	
    	<welcome-file-list>
    		<welcome-file>index.html</welcome-file>
    		<welcome-file>index.htm</welcome-file>
    		<welcome-file>index.jsp</welcome-file>
    	</welcome-file-list>
    	
    	
    	<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：

![20150515183717288][]

![20150515183722296][]

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

**[本文工程免费下载][Link 1]**

[Evankaka]: http://my.csdn.net/Evankaka
[http_blog.csdn.net_evankaka]: http://blog.csdn.net/evankaka
[Link 1]: http://download.csdn.net/detail/evankaka/8704401
[20150515185054921]: /images/20210811/09aaac4ba59845c9a142d970334f8094.png
[20150515185138882]: /images/20210811/356cd6f633104426ae0feb806fbd9224.png
[20150515184141775]: /images/20210811/ff03fda26afc4bef8a2490ee5bb8cfd0.png
[20150515183717288]: /images/20210811/c8d33297cf074ec2aa40f642a7fa3f65.png
[20150515183722296]: /images/20210811/360c25941bb94352a21a36a6bdf1e5dd.png