mybatis中sqlsession工具类的创建

package com.imooc.mybatis.utils;
 
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 
import java.io.Reader;
 
public class MybatisUtils {
    private static SqlSessionFactory sqlSessionFactory = null;
    static {
        try {
            Reader reader = Resources.getResourceAsReader("mybatis-config.xml");
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        }catch (Exception e) {
            e.printStackTrace();
            throw new ExceptionInInitializerError(e);
        }
    }
 
    //创建sqlSession
    public static SqlSession openSession(){
        return sqlSessionFactory.openSession();
    }
 
    //关闭sqlSession
    public static void closeSession(SqlSession sqlSession) {
        if(sqlSession!=null) {
            sqlSession.close();
        }
    }
}