获取本地请求的真实IP地址

 1 /** 
 2  * 自定义访问对象工具类 
 3  *  
 4  * 获取对象的IP地址等信息 
 5  * 
 6  */  
 7 public class CusAccessObjectUtil {  
 8   
 9     /** 
10      * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址, 
11      * 参考文章： http://developer.51cto.com/art/201111/305181.htm 
12      *  
13      * 可是，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，究竟哪个才是真正的用户端的真实IP呢？ 
14      * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。 
15      *  
16      * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 
17      * 192.168.1.100 
18      *  
19      * 用户真实IP为： 192.168.1.110 
20      *  
21      * @param request 
22      * @return 
23      */  
24     public static String getIpAddress(HttpServletRequest request) {
25         String ip = request.getHeader("x-forwarded-for");  
26         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
27             ip = request.getHeader("Proxy-Client-IP");  
28         }  
29         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
30             ip = request.getHeader("WL-Proxy-Client-IP");  
31         }  
32         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
33             ip = request.getHeader("HTTP_CLIENT_IP");  
34         }  
35         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
36             ip = request.getHeader("HTTP_X_FORWARDED_FOR");  
37         }  
38         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
39             ip = request.getRemoteAddr();  
40         }  
41         return ip.split(",")[0];  
42     }  
43       
44 }