Mybatis学习笔记（四）——MyBatis整合spring

矫情吗；* 2022-06-03 05:24 225阅读 0赞

[本案例源码下载][Link 1]

## 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：  
![需要导入的jar包][jar]  
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>
        
        <typeAliases>
            
            <package name="com.zrxjuly.mybatis.pojo" />
        </typeAliases>
    
        <mappers>
            
            <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">
    
        
        <context:property-placeholder location="classpath:db.properties"/>
    
        
        <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
            
            <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>
    
        
        <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
            
            <property name="dataSource" ref="dataSource"></property>
    
            
            <property name="configLocation" value="classpath:sqlMapConfig.xml"></property>
        </bean>
    
        
        <bean id="userDAO" class="com.zrxjuly.mybatis.dao.UserDAOImpl">
            <property name="sqlSessionFactory" ref="sqlSessionFactoryBean"></property>
        </bean>
    
        
        
    
          
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            
            <property name="basePackage" value="com.zrxjuly.mybatis.mapper"></property>
        </bean>
    </beans>

## src下的db.properties ##

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

## src下的log4j.properties ##

# Global logging configuration
    log4j.rootLogger=ERROR, stdout 
    # MyBatis logging configuration...
    log4j.logger.org.mybatis.example.BlogMapper=TRACE
    # Console output...
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
    log4j.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);
        }
    }

[Link 1]: https://github.com/zrxJuly/frame_demo/tree/master/mybatis-spring
[jar]: /images/20220603/d15d8ee20bee4306ba0b928cf49516ac.png