获取IP地址 & 伪装IP地址发送请求

 //获取请求客户端IP地址   　　

 public final static String getIpAddress(HttpServletRequest request) throws IOException {  
         // 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址  
         String ip = request.getHeader("X-Forwarded-For");  
         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
             if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
                 ip = request.getHeader("Proxy-Client-IP");  
             }  
             if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
                 ip = request.getHeader("WL-Proxy-Client-IP");  
             }  
             if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
                 ip = request.getHeader("HTTP_CLIENT_IP");  
             }  
             if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
                 ip = request.getHeader("HTTP_X_FORWARDED_FOR");  
             }  
             if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
                 ip = request.getRemoteAddr();  
             }  
         } else if (ip.length() > 15) {  
             String[] ips = ip.split(",");  
             for (int index = 0; index < ips.length; index++) {  
                 String strIp = (String) ips[index];  
                 if (!("unknown".equalsIgnoreCase(strIp))) {  
                     ip = strIp;  
                     break;  
                 }  
             }  
         }  
         return ip;  
     } 

  　　　  //指定伪IP地址代理请求
            String visitIP=getIpAddress(request);
            URL url = new URL("http://www.baidu.com");    
            URLConnection connection = url.openConnection();    
         
            connection.setRequestProperty("X-Forwarded-For",visitIP);
            connection.setRequestProperty("Proxy-Client-IP",visitIP);
            connection.setRequestProperty("WL-Proxy-Client-IP",visitIP);
            connection.setRequestProperty("HTTP_CLIENT_IP",visitIP);
            connection.setRequestProperty("HTTP_X_FORWARDED_FOR",visitIP);
            connection.setRequestProperty("REMOTE_ADDR",visitIP);
            connection.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.142 Safari/535.19");
//            connection.setConnectTimeout(30000);
//            connection.setReadTimeout(30000);
            connection.connect();
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(),"UTF-8"));
            String line;    
            while((line = reader.readLine())!= null){     
                 result.append(line);    
            }
           System.out.prinlt(result.toString());