SpringMVC之REST

概述

简单理解：对一个资源的增删改查用请求方式来区分：

  • /book/1 GET：查询1号图书
  • /book/1 DELETE：删除1号图书
  • /book/1 PUT：修改1号图书
  • /book POST：新增图书

实验步骤

编写 jsp页面

<%--发起图书的增删改查--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isErrorPage="true" %>
<html>
  <head>
    <title>$Title$</title>
  </head>
  <body>
<%--  /book/1  get:查询图书--%>
<%--  /book/1  delete:删除图书--%>
<%--  /book/1  put:修改图书--%>
<%--  /book  get:添加图书--%>
<a href="book/1">查询图书</a><br>

  <form action="book" method="post">
    <input type="submit" value="添加图书">
  </form><br>

<form action="book/1" method="post">
  <input type="hidden" name="_method" value="delete">
  <input type="submit" value="删除图书">
</form><br>

<form action="book/1" method="post">
  <input type="hidden" name="_method" value="put">
  <input type="submit" value="修改图书">
</form><br>

  </body>
</html>

在web.xml中配置一个filter：HiddenHttpMethodFilter过滤器

<!--    配置rest风格的过滤器-->
    <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层的代码

package com.yicurtain.servlet;

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;

@Controller
public class bookController {
    @RequestMapping(value = "/book/{bid}",method = RequestMethod.GET)
    public String getBook(@PathVariable("bid")Integer id){
        System.out.println("查询到了"+id+"号图书");
        return "success";
    }
    @RequestMapping(value = "/book",method = RequestMethod.POST)
    public String addBook(){
        System.out.println("添加到了图书");
        return "success";
    }
    @RequestMapping(value = "/book/{bid}",method = RequestMethod.DELETE)
    public String deleteBook(@PathVariable("bid") Integer id){
        System.out.println("删除到了"+id+"号图书");
        return "success";
    }
    @RequestMapping(value = "/book/{bid}",method = RequestMethod.PUT)
    public String updateBook(@PathVariable("bid") Integer id){
        System.out.println("更新到了"+id+"号图书");
        return "success";
    }

}

注意事项

​ 高版本Tomcat会出现问题：JSPs only permit GET POST or HEAD，在在跳转之后的(success.jsp)页面上加上异常处理即可.

<%@ page contentType="text/html;charset=UTF-8" language="java"  isErrorPage="true" %>