java

	  /**
	   * zhaochongli
	   *  如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值 
	　　		取X-Forwarded-For中第一个非unknown的有效IP字符串。如：
		X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 192.168.1.100
		用户真实IP为： 192.168.1.110
	   * @param request
	   * @return
	   */
	public static String getIpAddr(HttpServletRequest request) {  
	    String ip = request.getHeader("x-forwarded-for");  
	    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.getRemoteAddr();  
	    }
	    if(StringUtils.isNotBlank(ip))
	    	ip = ip.split(",")[0];
	    return ip;  
	}   

	public static String toUrl(String url,Map paraMap) throws HttpException, IOException{
		log.info("url:" + url);
		HttpClient client = new HttpClient();

		client.setTimeout(5000);
		client.setConnectionTimeout(5000);
		PostMethod post = new PostMethod(url); 
		post.addRequestHeader("Connection", "close");
		NameValuePair[] data = new NameValuePair[0];
		String result = "0";
		try {
			if(paraMap != null ){
				Set set = paraMap.keySet();
				Object[] objs = set.toArray();
				if(objs != null && objs.length > 0){
					data = new NameValuePair[objs.length];
					for(int i=0;i<objs.length;i++){
						data[i] = new NameValuePair(objs[i].toString(),paraMap.get(objs[i]).toString());
						log.info(objs[i].toString() +"\t" + paraMap.get(objs[i]).toString());
					}
				}
			}
			post.setRequestBody(data);
			client.executeMethod(post);
//			Header[] headers = post.getResponseHeaders();
			int statusCode = post.getStatusCode();
			log.info("tourl> statusCode:"+statusCode);
			
			result = new String(post.getResponseBodyAsString().getBytes("utf-8"));
		} catch (Exception e) {
			e.printStackTrace();
			log.error(e);
		}finally{
			post.releaseConnection();
		}
		return result;
	}