Java中使用HttpRequest获取用户真实IP地址

 1 import javax.servlet.http.HttpServletRequest;  
 2   
 3 /** 
 4  * 自定义访问对象工具类 
 5  *  
 6  * 获取对象的IP地址等信息 
 7  * @author X-rapido 
 8  * 
 9  */  
10 public class CusAccessObjectUtil {  
11   
12     /** 
13      * 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, 
14 *  
16      * 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？ 
17      * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。 
18      *  
19      * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 
20      * 192.168.1.100 
21      *  
22      * 用户真实IP为： 192.168.1.110 
23      *  
24      * @param request 
25      * @return 
26      */  
27     public static String getIpAddress(HttpServletRequest request) {  
28         String ip = request.getHeader("x-forwarded-for");  
29         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
30             ip = request.getHeader("Proxy-Client-IP");  
31         }  
32         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
33             ip = request.getHeader("WL-Proxy-Client-IP");  
34         }  
35         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
36             ip = request.getHeader("HTTP_CLIENT_IP");  
37         }  
38         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
39             ip = request.getHeader("HTTP_X_FORWARDED_FOR");  
40         }  
41         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
42             ip = request.getRemoteAddr();  
43         }  
44         return ip;  
45     }  
46       
47 }