Mybatis学习笔记（四）——MyBatis整合spring

本案例源码下载

导入jar包

新建一个java project，命名为mybatis-spring.
在项目下新建一个lib文件夹，导入相应的包：

导入后，选中lib下的所有jar包，右键——>Build Path——>Add to BuildPath.

src下新建sqlMapConfig.xml

sqlMapConfig.xml文件完整代码如下：

<?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>        <!-- 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.zrxjuly.mybatis.pojo" />    </typeAliases>    <mappers>        <!-- 扫描mapper下的xml文件 -->        <package name="com.zrxjuly.mybatis.mapper"/>    </mappers></configuration>

src下新建applicationContext.xml

完整代码如下：

<?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"/>    <!-- 配置数据库连接池 -->    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">        <!-- 此处的property的name值不可随便更改，必须是以下名称 -->        <property name="driverClassName" value="${jdbc.driver}"></property>        <property name="url" value="${jdbc.url}"></property>        <property name="username" value="${jdbc.username}"></property>        <property name="password" value="${jdbc.password}"></property>        <property name="maxActive" value="10"></property>        <property name="maxIdle" value="5"></property>    </bean>    <!-- mybatis的工厂. 此处的class名直接从 mybatis-spring-xxx.jar下的org.mybatis.spring下拷贝SqpSessionFactoryBean的类名称-->    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">        <!-- 注入数据库连接池 -->        <property name="dataSource" ref="dataSource"></property>        <!-- mybatis核心配置文件的位置 -->        <property name="configLocation" value="classpath:sqlMapConfig.xml"></property>    </bean>    <!-- 方式1：手动实例化DAO,原始的开发 -->    <bean id="userDAO" class="com.zrxjuly.mybatis.dao.UserDAOImpl">        <property name="sqlSessionFactory" ref="sqlSessionFactoryBean"></property>    </bean>    <!-- 方式2：使用Mapper动态代理开发 -->    <!-- <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">        注入mybatis的工厂        <property name="sqlSessionFactory" ref="sqlSessionFactoryBean" />        <property name="mapperInterface" value="com.zrxjuly.mybatis.mapper.UserMapper"></property>    </bean> -->    <!-- 方式3：扫描   Mapper动态代理开发 -->      <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">        <!-- 基本包  扫描的是基础包下的类文件.-->        <property name="basePackage" value="com.zrxjuly.mybatis.mapper"></property>    </bean></beans>

src下的db.properties

jdbc.driver=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf-8jdbc.username=rootjdbc.password=rongxiang

src下的log4j.properties

# Global logging configurationlog4j.rootLogger=ERROR, stdout # MyBatis logging configuration...log4j.logger.org.mybatis.example.BlogMapper=TRACE# Console output...log4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

User.java

src下新建包，名为com.zrxjuly.mybatis.pojo，在该包下新建User.java

package com.zrxjuly.mybatis.pojo;import java.util.Date;public class User {    private Integer id;    private String username;    private String sex;    private Date birthday;    private String address;    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 + "]";    }}

UserMapper.java

src下新建包，名为com.zrxjuly.mybatis.mapper,包下新建UserMapper.java。

package com.zrxjuly.mybatis.mapper;import com.zrxjuly.mybatis.pojo.User;public interface UserMapper {    public User selectUserById(Integer id);}

UserMapper.xml

与UserMapper.java同一个目录下，新建UserMapper.xml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="com.zrxjuly.mybatis.mapper.UserMapper">    <select id="selectUserById" parameterType="Integer" resultType="User">        select * from user where id=#{id}    </select></mapper>

新建测试类

src下新建包，名为com.zrxjuly.mybatis.junit，在包下新建UserTest.java

package com.zrxjuly.mybatis.junit;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.zrxjuly.mybatis.mapper.UserMapper;import com.zrxjuly.mybatis.pojo.User;/** *  * 测试类. *  */public class UserTest {    // 使用Mapper动态代理开发applicationContext.xml中的方式2.    @SuppressWarnings("resource")    @Test    public void testMapper() {        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");        UserMapper userMapper = (UserMapper) ac.getBean("userMapper");        User user = userMapper.selectUserById(1);        System.out.println(user);    }    // 使用Mapper动态代理开发applicationContext.xml中的方式3.    @SuppressWarnings("resource")    @Test    public void testMappers() {        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");        UserMapper userMapper = (UserMapper) ac.getBean(UserMapper.class);        User user = userMapper.selectUserById(1);        System.out.println(user);    }}