package com.ssm.utils;import java.io.IOException;
import java.io.InputStream;import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
/*** MyBatis的核心接口和类* @author Administrator**/
public class MyBatisUtil {private static SqlSessionFactory factory;/** 在静态代码块下，factory只会被创建一次*/static{try {String resource="mybatis-config.xml";InputStream is=Resources.getResourceAsStream(resource);factory=new SqlSessionFactoryBuilder().build(is);} catch (IOException e) {// TODO Auto-generated catch block
            e.printStackTrace();}}/*** 创建SqlSession对象* @return*/public static SqlSession createSession(){return factory.openSession(false);//true为自动提交事务，true为默认值
    }/*** 关闭SqlSession对象* @param session*/public static void closeSession(SqlSession session){if (session!=null) {session.close();}}
}

package com.ssm.test;import java.util.List;import org.apache.ibatis.session.SqlSession;import com.ssm.entity.Address;
import com.ssm.entity.User;
import com.ssm.mapper.UserMapper;
import com.ssm.utils.MyBatisUtil;public class TestUser {public static void main(String[] args) {SqlSession session=null;List<User> userList;/*** 查询所有user的集合*/try {session=MyBatisUtil.createSession();userList = session.getMapper(UserMapper.class).getUserList();for (User user : userList) {System.out.println("userid:"+user.getId()+"\tuserName:"+user.getUserName());}} catch (Exception e) {// TODO Auto-generated catch block
            e.printStackTrace();}finally{MyBatisUtil.closeSession(session);}}
}