Mybatis+Spring整合创建Web项目

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

本文工程免费下载

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

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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：

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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

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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：

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<?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

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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

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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

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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

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<?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

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<?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="christmas258@" />

</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

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<?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

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<%@ 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：