框架简集

1、springmvc将所有的请求都提交给DispatcherServlet,它会委托应用系统的其他模块负责对请求进行真正的处理工作;
2、DispatcherServlet查询一个或多个HandlerMapping,找到处理请求的Controller;3、DispatcherServlet将请求提交到目标Controller;4、Controller进行业务逻辑处理后,会返回一个ModelAndView;5、DispathcherServlet查询一个或多个ViewResolver视图解析器,找到ModelAndView对象指定的视图对象;6、视图负责将结果显示到客户端;视图对象负责渲染返回给客户端。DispatcherServlet:前端控制器;(相当于一个转发器,中央处理器,调度)ModelAndView:模型和视图的结合体;(Spring mvc的底层对象)HandlerMapping:处理器映射器spring mvc运行原理1、客户端请求提交到DispatcherServlet;2、由DispatcherServlet控制器查询一个或多HandlerMapping,找到处理请求的Controller;3、DispatcherServlet将请求提交到Controller;4、Controller调用业务逻辑处理后,返回ModelAndView;5、DispatcherServlet查询一个或多个ViewResoler视图解析器,找到ModelAndView指定的视图;6、视图负责将结果显示到客户端。DispatcherServlet是整个Spring MVC的核心。它负责接收HTTP请求组织协调Spring MVC的各个组成部分。其主要工作有以下三项:1、截获符合特定格式的URL请求;2、初始化DispatcherServlet上下文对应的WebApplicationContext,并将其与业务层、持久化层的WebApplicationContext建立关联;3、初始化Spring MVC的各个组成组件,并装配到DispatcherServlet中。Hibernate工作原理及为什么要用?原理:1、读取并解析配置文件2、读取并解析映射信息,创建SessionFactory3、打开Sesssion4、创建事务 Transation5、持久化操作6、提交事务7、关闭Session8、关闭SesstionFactory为什么要用:1、对JDBC访问数据库的代码做了封装,大大简化了数据访问层繁琐的重复性代码;2、Hibernate是一个基于JDBC的主流持久化框架,是一个优秀的ORM实现。他很大程度的简化DAO层的编码工作;3、hibernate使用Java反射机制,而不是字节码增强程序来实现透明性;4、hibernate的性能非常好,因为它是个轻量级框架。映射的灵活性很出色。它支持各

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种关系数据库,从一对一到多对多的各种复杂关系。

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