封裝一個Mybatis工具類

1、新建一個類MybatisUtil

注意：
定義一個全局變量public static SqlSessionFactory factory
用一個靜態塊來初始化

package cn.bdqn.smbms.dao.mybatisUtil;

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;

public class MybatisUtil {
//創建會話工廠
	public static SqlSessionFactory factory;
	
	static {
		SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder();
		try {
			InputStream is= Resources.getResourceAsStream("mybatis-config.xml");
			factory=builder.build(is);
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
	
	//改爲靜態方法，或者實例化
	public static SqlSession createSession() {
		//獲取會話
			return factory.openSession();
		
	}
	
	public static void closeSession(SqlSession session) {
			//關閉會話
		session.close();
	
	}
	
	
}

測試類

package cn.bdqn.smbms.test;

import java.util.List;

import org.apache.ibatis.session.SqlSession;

import cn.bdqn.smbms.dao.mybatisUtil.MybatisUtil;
import cn.bdqn.smbms.dao.user.UserDao;
import cn.bdqn.smbms.pojo.User;

public class testTwo {

	public static void main(String[] args) {
		
		SqlSession session=MybatisUtil.createSession();
		
		String userName="張";
		Integer roleId=3;
		List<User> userList=session.getMapper(UserDao.class).selectByNameRole(userName, roleId);
		for (User user : userList) {
			System.out.println(user.getUserRoleName());
		}
				
	}

}