controller层： 接受请求（例如登录请求） （调用service层，返回结果） 响应结果（） 实现思路：首先要与用户建立会话，然后调用service层的方法
service层： 业务逻辑判断 实现方法
entity层： 写出实体相关属性，以及所有获取属性，修改属性的方法
dao层： 定义了一系列操作数据库的方法。 DAO实现类:实现了操作数据库的方法 具体实现在在mapper文件下.xml文件里
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