package HelloWorld;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import HelloWorld.UserDao;
import HelloWorld.User;public class HelloWorld {/*** @param args*/public static void main(String[] args) {ApplicationContext ctx=new ClassPathXmlApplicationContext("classpath:ApplicationContext.xml");UserDao userDao=(UserDao) ctx.getBean("userDao");User user=new User();user.setId(1);System.out.println(userDao.getUser(user).toString());}}

<?xml version="1.0" encoding="UTF-8"?>
<beans  xmlns="http://www.springframework.org/schema/beans"  xmlns:tx="http://www.springframework.org/schema/tx"  xmlns:p="http://www.springframework.org/schema/p"  xmlns:aop="http://www.springframework.org/schema/aop"   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-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">
<!-- 配置数据源-->  <bean id="jdbcDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">  <property name="driverClassName">  <value>com.mysql.jdbc.Driver</value>  </property>  <property name="url">  <value>jdbc:mysql://localhost:3306/mybatis</value>  <!--springmybaitis是我的数据库  --></property>  <property name="username">  <value>root</value>  </property>  <property name="password">  <value>root</value>  </property>  </bean>  <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">  <property name="dataSource" ref="jdbcDataSource" />  <property name="configLocation" value="classpath:conf.xml"></property>  </bean>  <bean id="userDao" class="org.mybatis.spring.mapper.MapperFactoryBean">  <property name="mapperInterface" value="HelloWorld.UserDao"></property>  <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>  </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><mappers><!-- 注册userMapper.xml文件， userMapper.xml位于me.gacl.mapping这个包下，所以resource写成me/gacl/mapping/userMapper.xml--><mapper resource="HelloWorld/UserDao.xml"/></mappers></configuration>

<?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">
<!-- 为这个mapper指定一个唯一的namespace，namespace的值习惯上设置成包名+sql映射文件名，这样就能够保证namespace的值是唯一的
例如namespace="me.gacl.mapping.userMapper"就是me.gacl.mapping(包名)+userMapper(userMapper.xml文件去除后缀)-->
<mapper namespace="HelloWorld.UserDao"><!-- 在select标签中编写查询的SQL语句， 设置select标签的id属性为getUser，id属性值必须是唯一的，不能够重复使用parameterType属性指明查询时使用的参数类型，resultType属性指明查询返回的结果集类型resultType="me.gacl.domain.User"就表示将查询结果封装成一个User类的对象返回User类就是users表所对应的实体类--><!-- 根据id查询得到一个user对象--><select id="getUser" parameterType="int" resultType="HelloWorld.User">select * from users where id=#{id}</select>
</mapper>

package HelloWorld;import HelloWorld.User;public interface UserDao {public User getUser(User user);public void addUser(User user);public void updateUser(User user);public void deleteUser(int UserId);
}

package HelloWorld;/*** @author gacl* users表所对应的实体类*/
public class User {//实体类的属性和表的字段名称一一对应private int id;private String name;private int age;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "User [id=" + id + ", name=" + name + ", age=" + age + "]";}
}