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 }