Mybatis框架，使用代理方式整合spring

整合思路

1. SqlSessionFactory对象应该放到spring容器中作为单例存在。
2. Mapper代理形式中，应该从spring容器中直接获得mapper的代理对象。
3. 数据库的连接以及数据库连接池事务管理都交给spring容器来完成。

整合需要的jar包

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1. spring的jar包
2. Mybatis的jar包
3. Spring+mybatis的整合包。
4. Mysql的数据库驱动jar包。
5. 数据库连接池的jar包。

项目结构

 

llog4j.properties

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.err
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=c\:mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###
# error warn info debug trace
log4j.rootLogger= info, stdout

jdbc.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true
jdbc.username=root
jdbc.password=123


#jdbc.driver=com.mysql.jdbc.Driver
#jdbc.url=jdbc:oracle://localhost:3306/hibernate
#jdbc.username=root
#jdbc.password=1234


#jdbc.driver=com.mysql.jdbc.Driver
#jdbc.url=jdbc:db2://localhost:3306/hibernate
#jdbc.username=root
#jdbc.password=1234

applicationContext.xml

<?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">
	<!--加载配置文件  -->
	<context:property-placeholder location="classpath:jdbc.properties"/>
	
	<!--数据库连接池  -->
	<bean id="dataSource" 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>
	
	<!-- mapper配置 -->
	<!-- 让spring管理sqlsessionfactory 使用mybatis和spring整合包中的 -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<!--数据库连接池  -->
		<property name="dataSource" ref="dataSource"></property>
		<!-- 别名 -->
		<property name="typeAliasesPackage" value="com.it.mapper"></property>
	</bean>
	
	<bean  class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.it.mapper"></property>
	</bean>
</beans>

UserMapper.xml

<?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.it.mapper.UserMapper">
	<!--   statementId -->
	<select id="findById" parameterType="int" resultType="com.it.bean.User">
		select * from user where id = #{id}
	</select>
	
</mapper>

UserMapper.java

package com.it.mapper;


import com.it.bean.User;

public interface UserMapper {
	//Mapper接口方法名和Mapper.xml中定义的statement的id相同
	//Mapper接口方法的输入参数类型和mapper.xml中定义的statement的parameterType的类型相同
	//Mapper接口方法的输出参数类型和mapper.xml中定义的statement的resultType的类型相同
	//接口和映射文件的名字最好保持一致   UserMapper.java  UserMapper.xml
	//接口和映射文件最好放到同一个目录

	public User findById(int id);
	
	
	
}

user.java

package com.it.bean;

import java.util.Date;

public class User {
	private int id;
	private String username;// 用户姓名
	private String sex;// 性别
	private Date birthday;// 生日
	private String address;// 地址
	
	public int getId() {
		return id;
	}
	public void setId(int 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 + "]";
	}
	
}

测试

package com.it.test;

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

import com.it.bean.User;
import com.it.mapper.UserMapper;

public class Test {
	@SuppressWarnings("resource")
	public static void main(String[] args) {
//		1、加载spring容器|初始化容器
		ApplicationContext context = new  ClassPathXmlApplicationContext("applicationContext.xml");
//		2、从容器中获取对象
		UserMapper bean = context.getBean(UserMapper.class);
		User user = bean.findById(1);
		System.out.println(user);
	}
}