Spring整合Mybatis极简完整示例（结构清晰仅需一个xml系统配置文件！）

看网上的教程都是一堆xml配置文件，我今天出一个教程，除mybatis映射文件外,整个spring容器框架整合mybatis只需要一个xml配置文件即可完成，

无需 :mybatis-config.xml, db.properties，web.xml。

示例环境：

spring5.2.9,下载地址：https://repo.spring.io/libs-release-local/org/springframework/spring/5.2.9.RELEASE/

Mybatis:3.5.6,下载地址：https://github.com/mybatis/mybatis-3/releases

以上包均为目前最新版本

1,User.java实体类

package com.sm.entity;

public class User {
    private String loginid;
    private String loginname;
    private String sex;
    private String mobile;

    public String getLoginid() {
        return loginid;
    }

    public void setLoginid(String loginid) {
        this.loginid = loginid;
    }

    public String getLoginname() {
        return loginname;
    }

    public void setLoginname(String loginname) {
        this.loginname = loginname;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append(getClass().getSimpleName());
        sb.append(" [");
        sb.append("loginid=").append(loginid);
        sb.append(", loginname=").append(loginname);
        sb.append(", sex=").append(sex);
        sb.append(", mobile=").append(mobile);
        sb.append("]");
        return sb.toString();
    }

}

2,UserDao.java 接口类

package com.sm.dao;

import java.util.List;

import com.sm.entity.User;

public interface UserDao {
	public User selectUserByID (int id);
	public List<User> selectUserByName (String loginname);
}

3，UserDao.xml 映射文件

<?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="user"> -->
<mapper namespace="com.sm.dao.UserDao">

<select id="selectUserByID" parameterType="int" resultType="com.sm.entity.User" >
  select * from t_users where id=#{id}
</select>


<select id="selectUserByName" parameterType="string" resultType="com.sm.entity.User" >
  select * from t_users where loginName like '%${value}%'
</select>

</mapper>

4，applicationContext.xml （spring+mybatis配置文件）

<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:p="http://www.springframework.org/schema/p"
    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-4.3.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.3.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
        
    <!-- 读取db.properties 
    <context:property-placeholder location="db.properties"/>
-->	
	<!-- 配置数据源 -->
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"  destroy-method="close">
		<property name="driverClassName" value="com.mysql.jdbc.Driver" />
		<property name="url" value="jdbc:mysql://127.0.0.1:3306/itqs" />
		<property name="username" value="root" />
		<property name="password" value="123" />
	</bean>

	
    <!-- 配置SqlSessionFactory对象 --> 
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
<!--         <property name="configLocation" value="mybatis-config.xml"/> -->
        <property name="mapperLocations" value="com/sm/dao/*.xml"/>
<!--         <property name="typeAliasesPackage" value="com.sm.entity" /> -->
    </bean>
 

    <!--配置userMapper对象-->
    <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <property name="mapperInterface" value="com.sm.dao.UserDao"/>
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>	
</beans>
                        

5，测试类Test.java

package com.sm.test;


import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.sm.dao.UserDao;
import com.sm.entity.User;

public class Test1 {

	public static void main(String[] args) {
		
		//第一种写法
	    ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
	    UserDao mapper = (UserDao)context.getBean("userMapper");
        User user = mapper.selectUserByID(18);
        System.out.println(user);
        
        //第二种写法
	    ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
	    UserDao mapper1 = ctx.getBean("userMapper",UserDao.class);
        List<User> userlist = mapper1.selectUserByName("李");
        System.out.println(userlist);		

	}

}

6, 效果：