1 public static String getIpAddr(HttpServletRequest request) { 2         String ipAddress = request.getHeader("x-forwarded-for"); 3         if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) { 4             ipAddress = request.getHeader("Proxy-Client-IP"); 5         } 6         if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) { 7             ipAddress = request.getHeader("WL-Proxy-Client-IP"); 8         } 9         if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {10             ipAddress = request.getRemoteAddr();11             String localIp = "127.0.0.1";12             String localIpv6 = "0:0:0:0:0:0:0:1";13             if (ipAddress.equals(localIp) || ipAddress.equals(localIpv6)) {14                 // 根据网卡取本机配置的IP15                 InetAddress inet = null;16                 try {17                     inet = InetAddress.getLocalHost();18                     ipAddress = inet.getHostAddress();19                 } catch (UnknownHostException e) {20                     e.printStackTrace();21                 }22             }23         }24         // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割25         String ipSeparate = ",";26         int ipLength = 15;27         if (ipAddress != null && ipAddress.length() > ipLength) {28             if (ipAddress.indexOf(ipSeparate) > 0) {29                 ipAddress = ipAddress.substring(0, ipAddress.indexOf(ipSeparate));30             }31         }32         return ipAddress;33     }