http请求(restful请求）

Controller

package com.mvca.controller;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
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;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
@RequestMapping("/rest")
public class TestRestController {
    Logger log = Logger.getLogger(TestRestController.class);
    @RequestMapping(value = "jsp", method = RequestMethod.GET)
    public String toJsp() throws IOException {
        return "rest";
    }
    @RequestMapping(method = RequestMethod.GET)
    public void get(HttpServletResponse resp, @RequestParam Map map) throws IOException {
        PrintWriter out = resp.getWriter();
        out.print("GET" + map);
    }
    @RequestMapping(method = RequestMethod.DELETE)
    public void delete(HttpServletResponse resp, @RequestParam Map map) throws IOException {
        PrintWriter out = resp.getWriter();
        out.print("DELETE,@Map:" + map);
    }
    @RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
    public void delete(HttpServletResponse resp, @RequestParam Map map, @PathVariable int id) throws IOException {
        PrintWriter out = resp.getWriter();
        out.print("DELETE/{id},@Map:" + map +",@PathVariable:"+ id);
    }
    @RequestMapping(method = RequestMethod.PUT)
    public void put(HttpServletResponse resp, @RequestParam Map map) throws IOException {
        PrintWriter out = resp.getWriter();
        out.print("PUT" + map);
    }
    @RequestMapping(method = RequestMethod.POST)
    public void post(HttpServletResponse resp, @RequestParam Map map) throws IOException {
        PrintWriter out = resp.getWriter();
        out.print("POST" + map);
    }
}

 web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>mva</display-name>
  <welcome-file-list>   
    <welcome-file>fld</welcome-file>  
  </welcome-file-list>
  
 <context-param>
     <param-name>log4jConfigLocation</param-name>
     <param-value>/WEB-INF/log4j.properties</param-value>
 </context-param>
 <listener>
     <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
 </listener>
  <filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
  
  <servlet>
  <servlet-name>wh</servlet-name>

  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
 
  <load-on-startup>1</load-on-startup>
  </servlet>      
  <servlet-mapping>
  <servlet-name>wh</servlet-name>
  
  <url-pattern>/</url-pattern>
  <url-pattern>/fld</url-pattern>
  </servlet-mapping>
  
</web-app>

jsp

<%@ 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>
<script type="text/javascript" 
    src="${pageContext.request.contextPath}/static/js/jquery-3.5.1.js"></script>
</head>
<body>

    <div id="http"></div>
    <form action="${pageContext.request.contextPath}/rest"
        method="post">
        <select name="_method"
            onchange="if(this.value=='GET') { this.parentNode.method='get';} else {  this.parentNode.method='post'; } ">
            <option value="GET">get</option>
            <option value="POST" selected="selected">post</option>
            <option value="PUT">put</option>
            <option value="DELETE">delete</option>
        </select> <input name="msg" value="msg"> <input
            type="submit" value="rest">
    </form>

</body>
<script type="text/javascript">
    $.ajax({
        type:'get',
        url : "${pageContext.request.contextPath}/rest",
        data : {
             msg : "getmsg"
        },
        success : function(res) {
            $("#http").append("<br>"+res + "&nbsp; using $.ajax  GET<br>");
        }

    });

    $.ajax({
        type:'post',
        url : "${pageContext.request.contextPath}/rest",
        data : {
            msg : "postmsg"
        },
        success : function(res) {
            $("#http").append("<br>"+res + "&nbsp; using $.ajax POST<br>");
        }

    });

    $.ajax({
        type:'post',
        url : "${pageContext.request.contextPath}/rest",
        data : {
            _method : "PUT",
            msg : "putmsg"
        },
        success : function(res) {
            $("#http").append("<br>"+res + "&nbsp; using $.ajax  _PUT<br>");
        },
        error:function(res){
            alert(res)
        }

    });

    $.ajax({
        type : "POST",
        url : "${pageContext.request.contextPath}/rest/110",
        data : {
            _method : "DELETE",
            msg : "delmsg110"
        },
        success : function(res) {
            $("#http").append("<br>"+res + "&nbsp; using $.ajax  _DELETE<br>");

        }

    });
    
    $.ajax({
        type : "POST",
        url : "${pageContext.request.contextPath}/rest",
        data : {
            _method : "DELETE",
            msg : "delete "
        },
        success : function(res) {
            $("#http").append("<br>"+res + "&nbsp; using $.ajax  _DELETE<br>");

        }

    });
</script>
</html>