HTTP Status 405 - JSPs only permit GET POST or HEAD问题的分析和解决办法

1.出错时的代码

（1）web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"version="3.1"><context-param><param-name>contextConfigLocation</param-name><param-value>/WEB-INF/applicationContext.xml</param-value></context-param>
<!-- 配置HiddenHttpMethodFilter:可以把post请求转为DELETE请求和PUT请求 --><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><!-- 配置DispatcherServlet --><!-- 默认的配置文件为 /WEB-INF/<servlet-name>-servlet.xml --><servlet><servlet-name>dispatcher</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>dispatcher</servlet-name><url-pattern>/</url-pattern></servlet-mapping>
</web-app>

（2）dispatcher-servlet.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:mvc="http://www.springframework.org/schema/mvc"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--自动扫描包中的Controlller --><context:component-scan base-package="com.itheima.controller"/><!-- 配置视图解析器: 如何把 handler 方法返回值解析为实际的物理视图 --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/jsp/"/><!-- 前缀 --><property name="suffix" value=".jsp"/><!-- 后缀，自动拼接 --></bean>
</beans>

（4）Test.java

    @RequestMapping(value = "order", method = RequestMethod.DELETE)@ResponseBody()public String testOrderDelete(@RequestParam("id") Integer id) {System.out.println("删除id为" + id + "的员工");return "success";}
@RequestMapping(value = "order", method = RequestMethod.PUT)@ResponseBody()public String testOrderPut(@RequestParam("id") Integer id) {System.out.println("更新id为" + id + "的员工");return "success";}

（5）index.jsp

<form action="order" method="post">id:<input type="text" name="id"><input type="hidden" name="_method" value="DELETE"><input type="submit" value="order提交delete">
</form>

<form action="order" method="post">id:<input type="text" name="id"><input type="hidden" name="_method" value="PUT"><input type="submit" value="order提交put">
</form>

2.错误原因分析

当在index.jsp中提交后，HiddenHttpMethodFilter会将method转换成对应的DELETE或PUT,SpingMVC会继续用对应的请求重定向到success.jsp中,而jsp只支持GET、POST、HEAD请求方法。

3.解决方法

（1）为controller里的方法加上@ResponseBody()注解，并且返回一个字符串。不过此方法无法进入指定success.jsp页面。

  @RequestMapping(value = "order", method = RequestMethod.PUT)@ResponseBody()public String testOrderPut(@RequestParam("id") Integer id) {System.out.println("更新id为" + id + "的员工");return "success";}

（2）使用重定向跳转到指定页面

  @RequestMapping(value = "order", method = RequestMethod.DELETE)public String testOrderDelete(@RequestParam("id") Integer id) {System.out.println("删除id为" + id + "的员工");//无法重定向到WEB-INF目录中，若要访问，需把该页面放入其它路径return "redirect:success.jsp";}

（3）taocat换到7.0以及以下版本

（4）在你的success页面头部文件设置其页面为错误页面

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

4.HiddenHttpMethodFilter转换请求的源码

   private String methodParam = "_method";
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {HttpServletRequest requestToUse = request;if ("POST".equals(request.getMethod()) && request.getAttribute("javax.servlet.error.exception") == null) {String paramValue = request.getParameter(this.methodParam);if (StringUtils.hasLength(paramValue)) {String method = paramValue.toUpperCase(Locale.ENGLISH);if (ALLOWED_METHODS.contains(method)) {requestToUse = new HiddenHttpMethodFilter.HttpMethodRequestWrapper(request, method);}}}
filterChain.doFilter((ServletRequest)requestToUse, response);}

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