Java 获取http请求头内容

<span style="white-space:pre"></span>String headValue = request.getHeader("user-agent");            Enumeration en = request.getHeaders("Accept-Encoding");              while(en.hasMoreElements()){                  headValue = (String) en.nextElement();                  String value = request.getHeader(headValue);                  System.out.println(headValue+"="+value);              }              System.out.println("-------------------------------------------------");              en = request.getHeaderNames()   ;               while(en.hasMoreElements()){                   String name = (String) en.nextElement();                   String value = request.getHeader(name);                   System.out.println(name+" = "+value);                                  }               System.out.println("-------------------------------------------------");