转自： https://blog.csdn.net/cockroach02/article/details/82194126
https://blog.csdn.net/cockroach02/article/details/82194126
一、当前现状
浏览器使用form提交信息的时候只支持GET和POST，如果需要在浏览器上使用PUT和DELETE请求方式的话，只能使用欺骗的方式了，SpringMvc提供了HiddenHttpMethodFilter类来提供支持，请看代码：
public class HiddenHttpMethodFilter extends OncePerRequestFilter {/** Default method parameter: {@code _method} *///我们的隐藏字段name必须为_methodpublic static final String DEFAULT_METHOD_PARAM = "_method";private String methodParam = DEFAULT_METHOD_PARAM;/*** Set the parameter name to look for HTTP methods.* @see #DEFAULT_METHOD_PARAM*/public void setMethodParam(String methodParam) {Assert.hasText(methodParam, "'methodParam' must not be empty");this.methodParam = methodParam;}@Overrideprotected 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);}/*** Simple {@link HttpServletRequest} wrapper that returns the supplied method for* {@link HttpServletRequest#getMethod()}.*/private static class HttpMethodRequestWrapper extends HttpServletRequestWrapper {private final String method;public HttpMethodRequestWrapper(HttpServletRequest request, String method) {super(request);this.method = method.toUpperCase(Locale.ENGLISH);}//通过继承方式对getMethod方法做了下改变，就变成了PUT或者DELETE了@Overridepublic String getMethod() {return this.method;}}}二、配置步骤
1. web.xml
<!-- HTTP PUT Form --><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>2. putform.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body><form method="POST" action="<%=request.getServletContext().getContextPath()%>/home/putformBody"><input type="hidden" name="_method" value="PUT"><p>姓名：</p><input type="text" name="name" /><br/><p>性别：</p><input type="text" name="sex" /><br/><p>年龄：</p><input type="text" name="age" /><br/><button type="submit">提交</button></form>
</body>
</html>3. putformBody（controller方法）
@RequestMapping(path="home/putformBody", method=RequestMethod.PUT, produces = "text/plain;charset=utf-8")@ResponseBodypublic String putformBody(HttpServletRequest req, HttpServletResponse resp) {String name = req.getParameter("name");String sex = req.getParameter("sex");String age = req.getParameter("age");return "name:" + name + ",sex:" + sex + ",age:" + age;}四、中间遇到的坑
1、拦截器的url-pattern必须配置为/*，不能配置/，否则不生效；
2、为对中文支持避免乱码配置CharacterEncodingFilter必须为放在第一个，否则即使是配置生效（断点调试能进去），但是依然中文乱码，初学的朋友参考web.xml如下：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"><description>cockroach-springmvc-xml</description><context-param><param-name>contextConfigLocation</param-name><param-value>classpath*:applicationContext.xml</param-value></context-param><servlet><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>/WEB-INF/springmvc-servlet.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>/</url-pattern></servlet-mapping><!-- UTF-8 encoding --><filter><filter-name>CharacterEncodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param><init-param><param-name>forceEncoding</param-name><param-value>true</param-value></init-param></filter><filter-mapping><filter-name>CharacterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><!-- HTTP PUT Form --><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>
</web-app>3、SpringMvc以@ResponseBody返回的时中文乱码，demo学习的话可以配置下@RequestMapping如下：
@RequestMapping(path="home/putformBody", method=RequestMethod.PUT, produces = "text/plain;charset=utf-8")五 参考连接
- 如何发送PUT请求和DELETE请求
- html 对 form 表单中 put,delete,patch的支持
- HTTP PUT请求时，表单数据无法传递
- springmvc 明明到处都配置了编码为UTF-8，可还是乱码！！！
)
)
