1、MVC&&Spring MVC
.mvc的就核心思想是业务数据抽取同业务数据呈现相分离
.View,视图层，为用户提供UI，重点关注数据的呈现
.model,业务数据的信息表示，关注支撑业务信息构成（对象类），通常是多个业务实体的组合
.controller,调用业务逻辑产生合适的数据（model）,传递数据给视图层用于呈现
Mvc是一种架构模式，程序分层，分工合作
spirng mvc 概念：
DispatcherServlet(前端控制器)
浏览器的请求通过DispacherServlet的分发到达一个合理的Controller，来生成业务数据model，再通过DispatcherServlet进行传递到View层
DispatcherServlet使用HandlerAdapter适配器.适配到相应的Controller
HandlerIntercaptor,拦截器,afterCompletion/postHandle/preHandle
HandlerMapping：
1.help DispatcherServlet to get the right cotroller
2.Wrap controller with HandlerInterceptor
HandlerExecutionChain:
preHandle-->Controoler method-->postHandle-->afterCompletion
ModelAndView
ViewResovle视图解析器
导入jar包
配置spring mvc 核心过滤器web.xml
<servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:application_spring_mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>
apllication.xml：
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd"> <context:component-scan base-package="com.nyan"/> <mvc:annotation-driven/> <!-- 視圖解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> </bean> <!-- 对静态资源的访问 --> <mvc:resources mapping="/images/**" location="/WEB-INF/images" cache-period="31556926"/> </beans>
Controller层：
package com.nyan.action; import org.springframework.context.annotation.Scope; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.servlet.ModelAndView; /** * Created by Administrator on 2017/3/11 0011. */ @Controller @Scope("prototype") @RequestMapping("/user") public class UserAction { @RequestMapping(value = "/save",method = RequestMethod.GET) public ModelAndView save(String name,String password){ System.out.println("後台處理數據:"+name); ModelAndView modelAndView = new ModelAndView();
//返回saveUserSuccess.jsp页面 modelAndView.setViewName("saveUserSuccess"); modelAndView.addObject("msg","save successfully"); return modelAndView; } }
view层：
<%-- Created by IntelliJ IDEA. User: Administrator Date: 2017/3/11 0011 Time: 12:05 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>$Title$</title> </head> <body> <form action="./user/save" method="get"> <input type="text" name="name" value="nyan"/> <input type="password" name="password" value="passw0rd"/> <input type="submit" value="submit"/> </form> </body> </html>
submit后调用./user/save,通过RequestMapping找到对应的action，进行业务逻辑处理返回一个modelAndView，通过视图解析器解析返回的modelAndView对象返回对应Dev视图。