如果项目是运行在 Tomcat 8 及以上，会发现发出的 PUT 请求和 DELETE 请求可以被控制其接收到，但是返回页面时（forward）会报HTTP 405 的错误提示："消息 JSP 只允许 GET、POST 或 HEAD。Jasper 还允许 OPTIONS"。
解决方案：
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使用 Tomcat 8 以下版本。
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使用
@RestController或者@Controller + @ResponseBody标签，但是这样就无法跳转页面了。 -
避免使用 forward 方式跳转页面，改为 重定向
redirect方式跳转到另一个控制器方法，再由这个控制器方法跳转页面。@RequestMapping(value = "/rest", method = RequestMethod.PUT) public String put() { // 接收表单中的各种信息 System.out.println("PUT --- 更新数据"); return "redirect:/success"; } @RequestMapping(value = "/success") public String success() { return "success"; } -
给 Tomcat 添加启动参数，使Tomcat允许写操作
<init-param> <param-name>readonly</param-name> <param-value>false</param-value> </init-param> -
创建一个新的 Filter 来过滤 FORWARD
// HiddenHttpMethodFilter.java @Override protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { HttpServletRequest requestToUse = request; if ("POST".equals(request.getMethod()) && request.getAttribute(WebUtils.ERROR_EXCEPTION_ATTRIBUTE) == null) { String paramValue = request.getParameter(this.methodParam); if (StringUtils.hasLength(paramValue)) { requestToUse = new HttpMethodRequestWrapper(request, paramValue); } } filterChain.doFilter(requestToUse, response); }HiddenHttpMethodFilter 中的
doFilterInternal方法是用来过滤 form 表单中 name 为 _method的请求。可以发现，它把请求作为参数传进HttpMethodRequestWrapper中并且返回了一个新的请求，放行的也是新的请求。所以我们可以重写 HttpMethodRequestWrapper 中的getMethod()方法，让它支持 forward 方式的跳转。// 重写 getMethod() package com.pudding.conf; import java.io.IOException; import javax.servlet.FilterChain; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletRequestWrapper; import javax.servlet.http.HttpServletResponse; import org.springframework.web.filter.HiddenHttpMethodFilter; public class MyHttpMethodFilter extends HiddenHttpMethodFilter { @Override protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException { HttpServletRequest requestToUse = request; String method = requestToUse.getMethod(); if (method.equalsIgnoreCase("delete") || method.equalsIgnoreCase("put")) { method = "POST"; } requestToUse = new HttpMethodRequestWrapper(request, method); filterChain.doFilter(requestToUse, response); } private static class HttpMethodRequestWrapper extends HttpServletRequestWrapper { private final String method; public HttpMethodRequestWrapper(HttpServletRequest request, String method) { super(request); this.method = method; } public String getMethod() { return this.method; } } }在 web.xml 中配置自己的过滤器：
<filter> <filter-name>myFilter</filter-name> <filter-class>com.pudding.conf.MyHttpMethodFilter</filter-class> </filter> <filter-mapping> <filter-name>myFilter</filter-name> <url-pattern>/*</url-pattern> <dispatcher>FORWARD</dispatcher> </filter-mapping> -
在 forward 需要跳转的页面头加上
isErrorPage="true"：<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" isErrorPage="true"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <h1>success</h1> </body> </html>