MyBatis与Spring整合的两种方式

1、第一步：导入jar包

spring的jar包、Mybatis的jar包、Spring+mybatis的整合包、Mysql的数据库驱动jar包、数据库连接池的jar包

2、加入配置文件：

Spring的配置文件——applicationContext.xml

这里有一点需要注意：在配置sqlSessionFactory工厂时，在注入数据库连接池的时候property的属性名是dataSource，不要乱写(很容易写成dataSourse)，否则会报如下错误：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactoryBean' defined in class path resource [applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'dataSourse'ofbean class [org.mybatis.spring.SqlSessionFactoryBean]: Bean property 'dataSourse' is not writable or has an invalid setter method. Did you mean'dataSource'?

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
	<!-- 加载数据库配置文件 -->
	<context:property-placeholder location="classpath:db.properties"/>
	
    <!-- 数据库连接池 -->
    <bean id="dataSourse" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
    	<property name="driverClassName" value="${jdbc.driver}"/>
		<property name="url" value="${jdbc.url}"/>
		<property name="username" value="${jdbc.username}"/>
		<property name="password" value="${jdbc.password}"/>
		<property name="maxActive" value="10"/>
		<property name="maxIdle" value="5"/>
    </bean>
    <!-- 配置SQLSessionFactory -->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 配置mybatis核心配置文件 -->
    	<property name="configLocation" value="sqlMapConfig.xml"/>
    	<!-- 注入连接池 -->
    	<property name="dataSource" ref="dataSourse"/>
    </bean>

	<!-- 配置Dao 原始dao开发-->
	<bean id="UserDao" class="com.qianjin.dao.UserDaoImpl">
	  	<property name="sqlSessionFactory" ref="sqlSessionFactoryBean"/>
	</bean>
	<!-- Mapper动态代理 -->
	<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
		<!-- 注入工厂 -->
		<property name="sqlSessionFactory" ref="sqlSessionFactoryBean"/>
		<!-- 注入接口 -->
		<property name="mapperInterface" value="sqlmapper.UserMapper"/>
	</bean>
</beans>

MyBatis的配置文件——sqlMapConfig.xml

<?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>
	<!-- 设置别名 -->
	<typeAliases>
		<!-- 2. 指定扫描包，会把包内所有的类都设置别名，别名的名称就是类名，大小写不敏感 -->
		<package name="com.qianjin.pojo"/>
	</typeAliases>
	
	<mappers>
		<package name="sqlmapper"/>
	</mappers>
	
</configuration>

链接数据库的配置信息文件——db.property

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8
jdbc.username=root
jdbc.password=123456

3、Dao开发：有两种形式。一种是传统的DAO开发，另一种是Mapper动态代理开发

（1）传统Dao开发

pojo类:

package com.qianjin.pojo;

import java.util.Date;

public class User{
	private Integer id;
	private String username;// 用户姓名
	private String sex;// 性别
	private Date birthday;// 生日
	private String address;// 地址
	
	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 String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	@Override
	public String toString() {
		return "User [id=" + id + ", username=" + username + ", sex=" + sex + ", birthday=" + birthday + ", address="
				+ address + "]";
	}

}

package com.qianjin.dao;

import com.qianjin.pojo.User;

public interface UserDao {
	User queryUserById(Integer id);
}

package com.qianjin.dao;

import org.mybatis.spring.support.SqlSessionDaoSupport;

import com.qianjin.pojo.User;

public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao{

	@Override
	public User queryUserById(Integer id) {
		User user = this.getSqlSession().selectOne("queryUserById", 10);
		return user;
	}
	

}

测试运行：

package com.qianjin.dao.test;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.qianjin.dao.UserDao;
import com.qianjin.pojo.User;
public class UserDaoTest {
	ApplicationContext context;
	@Before
    public void init(){
    	 this.context = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
    }
	@Test
	public void testQueryUserById(){
		UserDao userDao=this.context.getBean(UserDao.class);
		User user = userDao.queryUserById(10);
		System.out.println(user);
		
	}
}

（2）Mapper动态代理开发（UserMapper接口和UserMapper.xml配置文件要在同一个包下）

配置UserMapper接口：

package sqlmapper;

import com.qianjin.pojo.User;

public interface UserMapper {
	User queryUserById(Integer id);
}

配置UserMapper.xml配置文件：

<?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="sqlmapper.UserMapper">
	<!-- 根据用户id查询 -->
	<select id="queryUserById" parameterType="Integer" resultType="user">
		select * from user where id = #{id}
	</select>
</mapper>

在Spring的配置文件applicationContext.xml中配置UserMapper的配置信息（上面的代码中已经配置，此处再贴一遍）

<!-- Mapper动态代理 -->
	<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
		<!-- 注入工厂 -->
		<property name="sqlSessionFactory" ref="sqlSessionFactoryBean"/>
		<!-- 注入接口 -->
		<property name="mapperInterface" value="sqlmapper.UserMapper"/>
	</bean>

写测试类进行测试：

package com.qianjin;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.qianjin.pojo.User;

import sqlmapper.UserMapper;

public class JunitTest {
	private ApplicationContext context;
	@Before
	public void init() {
		//通过类路径配置spring配置文件的位置信息
		this.context=new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
	}
	@Test
	public void testQueryUserById() {
		//根据spring配置文件获取bean
		UserMapper userMapper = (UserMapper) this.context.getBean("userMapper");
		User user = userMapper.queryUserById(10);
		System.out.println(user);
	}
}