public static String addStudent(Student student)
{
Configuration config = new Configuration().configure();
SessionFactory sessionFactory = config.buildSessionFactory();
String result="ok";
Session session=sessionFactory.openSession();
Transaction t=session.beginTransaction();

try {
session.save(student);
t.commit();
} catch (Exception e) {
result="fail";
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
session.close();
sessionFactory.close();
}

return result;
}

一定要注意要在每一个方法中创建sessionFactory，不能定义为全局静态变量！！！！！ 

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解决 bae 私有mysql 出现Caused by: java.net.SocketException: Connection reset的异常