SqlSession的工具类

package com.cbh.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;

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;
}
}