Maven项目中Spring整合Mybatis
spring需要的jar包依赖
<dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.3.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.3.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>4.3.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>4.3.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>4.3.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.3.2.RELEASE</version> </dependency>
mybatis的jar包依赖
<dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.8</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.0</version> </dependency>
mysql的jar包依赖
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.38</version> </dependency>
阿里巴巴druid数据源的jar包依赖
<dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.18</version> </dependency>
junit测试使用的jar包依赖
<dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency>
添加属性文件config.properties，文件内容如下
#jdbc jdbc_driverClassName=com.mysql.jdbc.Driver jdbc_url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull jdbc_username=root jdbc_password=111111 validationQuery=SELECT 1
<?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:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="com.ljd.service"></context:component-scan> <context:property-placeholder location="classpath:config.properties" ignore-unresolvable="true" /> <!-- 配置数据源 --> <bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="url" value="${jdbc_url}" /> <property name="username" value="${jdbc_username}" /> <property name="password" value="${jdbc_password}" /> <!-- 初始化连接大小 --> <property name="initialSize" value="0" /> <!-- 连接池最大使用连接数量 --> <property name="maxActive" value="20" /> <!-- 连接池最小空闲 --> <property name="minIdle" value="0" /> <!-- 获取连接最大等待时间 --> <property name="maxWait" value="60000" /> <property name="validationQuery" value="${validationQuery}" /> <property name="testOnBorrow" value="false" /> <property name="testOnReturn" value="false" /> <property name="testWhileIdle" value="true" /> <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000" /> <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="25200000" /> <!-- 打开removeAbandoned功能 --> <property name="removeAbandoned" value="true" /> <!-- 1800秒，也就是30分钟 --> <property name="removeAbandonedTimeout" value="1800" /> <!-- 关闭abanded连接时输出错误日志 --> <property name="logAbandoned" value="true" /> <!-- 监控数据库 --> <!-- <property name="filters" value="stat" /> --> <property name="filters" value="mergeStat" /> </bean> <!-- myBatis文件 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- 配置数据库表对应的java实体类 --> <property name="typeAliasesPackage" value="com.ljd.pojo" /> <!-- 自动扫描entity目录, 省掉Configuration.xml里的手工配置 --> <property name="mapperLocations" value="classpath:com/ljd/mapper/*.xml" /> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.ljd.mapper" /> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> </bean> </beans>
其中，黄色字体的位置需要根据自己项目的包名修改为具体的字串。
4.添加测试使用的文件：
该图是本示例的代码目录结构，
User是与数据库表对应的实体。如果UserMapper.xml中使用到该类，则该User类必须提供一个无参的构造函数。
public class User {
private String username;
private String password;
//…getter,setter
}
UserMapper.xml如下
<?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.sm.mapper.UserMapper">
<select id="selectUser1" parameterType="java.lang.String"
resultType="User">
select * from user where username=#{username}
</select>
</mapper>
与UserMapper.xml对应的UserMapper.java如下:
package com.sm.mapper;
import java.util.HashMap;
import com.sm.pojo.User;
public interface UserMapper {
User selectUser1(String username);
}
编写业务逻辑层Service：UserService接口
package com.sm.service;
import com.sm.pojo.User;
public interface UserService {
User getUserByUsername(String username);
}
编写UserService实现类UserServiceImpl
package com.sm.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.sm.mapper.UserMapper;
import com.sm.pojo.User;
import com.sm.service.UserService;
@Service("userService")
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public User getUserByUsername(String username) {
User user = userMapper.selectUser1(username);
return user;
}
}
编写测试类用于测试UserServiceImpl是否能正常工作：Test.java类如下
package com.myPj.Spring_Mybatis;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.sm.pojo.User;
import com.sm.service.UserService;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:spring-mybatis.xml" })
public class Test {
@Autowired
private UserService userService;
@org.junit.Test
public void test1() {
User user = userService.getUserByUsername("ggg");
System.out.println(user.getUsername());
System.out.println(user.getPassword());
}
}
点击方法运行为junit测试后结果如下：
至此，spring与mybatis的整合完成。