参考视频：传送门
@RequestMapping 注解除了可以修饰类中的方法外，还可以用来修饰类，修改SpringMVCHandler类,通过在类上添加@Mapping注解可以将请求分路径
在index.jsp文件页面中HelloWorld超链要做如下修改：
<a href="spingmvc/helloWorld">helloWorld</a>
（1）根据请求方式进行映射
通过method属性 （get请求，post请求）
reset 风格的URL路径的映射
GET请求
POST请求
DELETE请求
PUT请求
rest意思是表现层状态转换。在WEB中，REST使用HTTP协议连接器来标识对资源的操作（获取/查询、创建、删除、修改），用HTTP Method 标识操作类型。HTTP GET 获取和查询资源、HTTP POST创建资源 、HTTP PUT修改资源 、HTTP DELETE删除资源
由于from表单只支持GET和POST方式，spring提供了一个过滤器HiddenHttpMethodFilter,可以将DELETE和PUT请求转换为标准的HTTP方式，即能将POST请求转为DELET或PUT请求
过程：
1）在web.xml配置一个过滤器
<!-- 配置HiddenHttpFilter 可将POST请求转为我们所需要的PUT或DELETE 定义部分-->
<filter>
<filter-name>HiddenHttpFilter</filter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
</filter>
<!-- 映射部分 -->
<filter-mapping>
<filter-name>HiddenHttpFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>2)处理GET请求
①在index.jsp页面中添加Rest GET超链接：<a href="springmvc/rest/1">Rest GET </a>
上篇文章也是做过的了，不知道有什么区别
3)处理POST请求，上篇文章其实已经做过了
用form表单
<form action="springmvc/rest" method="post">
<input type="submit" value="RestPOST">
</form>
类中对应的方法：
@RequestMapping(value="/rest",method=RequestMethod.POST)
public String restPost(){
System.out.println("REST POST:");
return "success";
}
4)处理DELETE请求
依然用表单完成，POST转换为DELET
<form action="springmvc/rest/1" method="post">
<input type="hidden" name="_method" value="DELETE">
<input type="submit" value="rest DELETE">
</form>类中方法：
@RequestMapping(value="/rest/{id}",method=RequestMethod.DELETE)
public String restDELETE(@PathVariable Integer id){
System.out.println("REST DELETE:"+id);
return "redirect:/springmvc/doTransfer";//重定向
}
@RequestMapping("doTransfer")
public String doTransfer(){
return "success";
}
5）处理PUT请求
跟DELETE一样，DELET改成PUT就可以了
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<a href="springmvc/helloWorld">helloWorld</a><br><br> <!-- 超链接，跳到 "helloWorld的控制器 -->
<!-- <a href="springmvc/requestMethod">RequestMethod</a><br><br> 用于get -->
<form action="springmvc/requestMethod" method="post">
<input type="submit" value="RequestMethod">
</form>
<br>
<a href="springmvc/rest/1">Rest GET</a><br><br>
<form action="springmvc/rest" method="post">
<input type="submit" value="RestPOST">
</form>
<br>
<form action="springmvc/rest/1" method="post"><!-- post转DELETE -->
<input type="hidden" name="_method" value="DELETE">
<input type="submit" value="rest DELETE">
</form>
<br><br>
<form action="springmvc/rest/1" method="post"><!-- post转PUT -->
<input type="hidden" name="_method" value="PUT">
<input type="submit" value="rest PUT">
</form>
</body>
</html>
package com.springmvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
//声明一个控制器
@RequestMapping("/springmvc")
@Controller
public class SpringMVCHandler {
//地址映射
@RequestMapping("/helloWorld")
public String sayHello() {
System.out.println("Hello World");
return "success";//逻辑视图名称
}
@RequestMapping(value="/requestMethod",method=RequestMethod.POST)
public String requestMethod() {
System.out.println("Hello World1");
return "success";
}
@RequestMapping(value="/rest/{id}")
public String restGet(@PathVariable Integer id){
System.out.println("REST GET:"+id);
return "success";
}
@RequestMapping(value="/rest",method=RequestMethod.POST)
public String restPost(){
System.out.println("REST POST:");
return "success";
}
@RequestMapping(value="/rest/{id}",method=RequestMethod.DELETE)
public String restDELETE(@PathVariable Integer id){
System.out.println("REST DELETE:"+id);
return "redirect:/springmvc/doTransfer";//重定向
}
@RequestMapping(value="/rest/{id}",method=RequestMethod.PUT)
public String restPUT(@PathVariable Integer id){
System.out.println("REST PUT:"+id);
return "redirect:/springmvc/doTransfer";//重定向
}
@RequestMapping("doTransfer")
public String doTransfer(){
return "success";
}
}
