MyBatis获取SqlSession

package com.ykmimi.dao;

import org.apache.ibatis.session.SqlSession;

import com.ykmimi.entity.Student;
import com.ykmimi.utils.MyBatisUtils;

public class StudentDaoImpl implements IStudentDao {

    private SqlSession sqlSession;

    @Override
    public void insertStu(Student student) {
        try {
            //通过MyBatis工具类获取SqlSession
            sqlSession = MyBatisUtils.getSqlSession();
            // .相关操作
            sqlSession.insert("stu.insertStudent", student);
            sqlSession.commit();
        } finally {// 异常在getSqlSession方法中被捕获
            if (sqlSession != null) {
                sqlSession.close();
            }
        }
    }

}

package com.ykmimi.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;
/*
 * 获取SqlSession 
 */
public class MyBatisUtils {

    private static SqlSessionFactory sqlSessionFactory;

    public static SqlSession getSqlSession() {
        try {
            InputStream is = Resources.getResourceAsStream("mybatis.xml");
            if (sqlSessionFactory == null) {
                sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
            }
            return sqlSessionFactory.openSession();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}