发起PUT,DELETE请求

浏览器只能发起get,post请求,通过添加Filter改变请求类型

package com;

import java.io.IOException;
import java.util.Locale;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;

public class HiddenHttpMethodFilter implements javax.servlet.Filter {

 /** 
  * 默认请求名称
  * Default method parameter: _method 
  */
 public static final String DEFAULT_METHOD_PARAM = "_method";
 /**
  * 支持转换的类型
  */
 public static final String[] SUPPORT_METHODS =new String[]{"PUT","DELETE"};

 private String methodParam = DEFAULT_METHOD_PARAM;

 public void destroy() {
 }

 public void doFilter(ServletRequest servletrequest,
   ServletResponse servletresponse, FilterChain filterchain)
   throws IOException, ServletException {
  HttpServletRequest request = (HttpServletRequest) servletrequest;
  HttpServletResponse response = (HttpServletResponse) servletresponse;
  String paramValue = request.getParameter(this.methodParam);
  if ("POST".equals(request.getMethod())
    && StringUtils.isNotBlank(paramValue)) {
   String method = paramValue.toUpperCase(Locale.ENGLISH);
   if(isSupportMethod(method)){
     request = new HttpMethodRequestWrapper(request,method);
   }
   filterchain.doFilter(request, response);
  } else {
   filterchain.doFilter(request, response);
  }

 }

 public void init(FilterConfig filterconfig) throws ServletException {
  String initMethodParam = filterconfig.getInitParameter("methodParam");
  methodParam = StringUtils.isNotBlank(initMethodParam) ? initMethodParam
    : DEFAULT_METHOD_PARAM;
 }
 public void setMethodParam(String methodParam) {
  this.methodParam = methodParam;
 }

 private static class HttpMethodRequestWrapper extends
   HttpServletRequestWrapper {

  private final String method;

  public HttpMethodRequestWrapper(HttpServletRequest request,
    String method) {
   super(request);
   this.method = method;
  }

  @Override
  public String getMethod() {
   return this.method;
  }
 }
 /**
  * 是否是支持的转换类型
  * @param method
  * @return
  */
 private static boolean isSupportMethod(String  method){
  for (int i = 0; i < SUPPORT_METHODS.length; i++) {
   String support_method = SUPPORT_METHODS[i];
   if(support_method.equalsIgnoreCase(method)){
    return true;
   }
  }
  return false;
 }
}

Web.xml配置

  
        HiddenHttpMethodFilter
        com.HiddenHttpMethodFilter
    
       
    HiddenHttpMethodFilter   
    /*   

 页面发起请求时在页面加入隐藏域,只有当请求为Post时,才进行转换