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 }