spring 集成 mybatis的实例详解

 <build>
 <!--
  Maven 项目:如果源代码(src/main/java)存在xml、properties、tld 等文件
  Maven 默认不会自动编译该文件到输出目录,如果要编译源代码中xml properties tld 等文件
  需要显式配置 resources 标签
 -->
 <resources>
  <resource>
  <directory>src/main/resources</directory>
  </resource>
  <resource>
  <directory>src/main/java</directory>
  <includes>
   <include>**/*.xml</include>
   <include>**/*.properties</include>
   <include>**/*.tld</include>
  </includes>
  <filtering>false</filtering>
  </resource>
 </resources>
 </build>

<?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:context="http://www.springframework.org/schema/context"
  xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context.xsd
  http://www.springframework.org/schema/aop
  http://www.springframework.org/schema/aop/spring-aop.xsd
  http://www.springframework.org/schema/tx
  http://www.springframework.org/schema/tx/spring-tx.xsd">
  <!-- 扫描基本包 -->
  <context:component-scan base-package="com.xxxx" />

  <!-- 加载properties 配置文件 -->
  <context:property-placeholder location="classpath:db.properties" />

  <!-- aop -->
  <aop:aspectj-autoproxy />

  <!-- 配置c3p0 数据源 -->
  <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="${jdbc.driver}"></property>
    <property name="jdbcUrl" value="${jdbc.url}"></property>
    <property name="user" value="${jdbc.username}"></property>
    <property name="password" value="${jdbc.password}"></property>
  </bean>

  <!-- 配置事务管理器 -->
  <bean id="txManager"
     class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
  </bean>

  <!-- 设置事物增强 -->
  <tx:advice id="txAdvice" transaction-manager="txManager">
    <tx:attributes>
      <tx:method name="add*" propagation="REQUIRED" />
      <tx:method name="insert*" propagation="REQUIRED" />
      <tx:method name="update*" propagation="REQUIRED" />
      <tx:method name="delete*" propagation="REQUIRED" />
    </tx:attributes>
  </tx:advice>

  <!-- aop 切面配置 -->
  <aop:config>
    <aop:pointcut id="servicePointcut" expression="execution(* com.xxxx.service..*.*(..))" />
    <aop:advisor advice-ref="txAdvice" pointcut-ref="servicePointcut" />
  </aop:config>

  <!-- 配置 sqlSessionFactory -->
  <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"></property>
    <property name="configLocation" value="classpath:mybatis.xml" />
    <property name="mapperLocations" value="classpath:com/xxxx/mapper/*.xml" />
  </bean>

  <!-- 配置扫描器 -->
  <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <!-- 扫描com.xxxx.dao这个包以及它的子包下的所有映射接口类 -->
    <property name="basePackage" value="com.xxxx.dao" />
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
  </bean>
</beans>

<?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>
 <!-- 定义类别名 -->
 <typeAliases>
  <package name="com.xxxx.po"/>
 </typeAliases>
</configuration>

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring_mybatis?
useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false
jdbc.username=root
jdbc.password=root 

log4j.rootLogger=DEBUG, Console
# Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n
log4j.logger.java.sql.ResultSet=INFO
log4j.logger.org.apache=INFO
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

public class User {
 private Integer userId;
 private String userName;
 private String userPwd;
 private String userEmail;
 private Date createDate;
 private Date updateDate;
 
 /**
  set get toString 方法省略
 **/
}

public interface UserDao {
 User queryUserByUserId(Integer userId);
}

<?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.xxxx.dao.UserDao">
  <select id="queryUserByUserId" parameterType="int"
resultType="com.xxxx.po.User">
   select user_id as userId,user_name as userName,user_pwd as userPwd
   from tb_user
   where user_id = #{userId}
  </select>
</mapper>

@Service
public class UserService {
 @Autowired
 private UserDao userDao;
 public User queryUserByUserId(Integer userId){
  return userDao.queryUserByUserId(userId);
 }
}

@Controller
public class UserController {
 // 注入userService
 @Resource
 private UserService userService;
 /**
 * 通过用户ID查询用户对象
 * @param userId
 * @return
 */
 public User queryUserByUserId(Integer userId) {
  User user = userService.queryUserByUserId(userId);
  return user;
 }
}

public class App {
 public static void main(String[] args) {
  // 加载Spring的配置
  BeanFactory factory = new ClassPathXmlApplicationContext("spring.xml");
  // 得到UserController对象
  UserController userController = (UserController)
factory.getBean("userController");
  // 调用方法
  User user = userController.queryUserByUserId(1);
System.out.println(user.toString());
 }
}