package com.rapido.utils; 
 
import javax.servlet.http.HttpServletRequest; 
 
/** 
 * 自定義訪問對象工具類 
 * 
 * 獲取對象的IP地址等信息 
 * @author X-rapido 
 * 
 */ 
public class CusAccessObjectUtil { 
 
  /** 
   * 獲取用戶真實IP地址，不使用request.getRemoteAddr();的原因是有可能用戶使用了代理軟件方式避免真實IP地址, 
   * 
   * 可是，如果通過了多級反向代理的話，X-Forwarded-For的值并不止一個，而是一串IP值，究竟哪個才是真正的用戶端的真實IP呢？ 
   * 答案是取X-Forwarded-For中第一個非unknown的有效IP字符串。 
   * 
   * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 
   * 192.168.1.100 
   * 
   * 用戶真實IP為： 192.168.1.110 
   * 
   * @param request 
   * @return 
   */ 
  public static String getIpAddress(HttpServletRequest request) { 
    String ip = request.getHeader("x-forwarded-for"); 
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
      ip = request.getHeader("Proxy-Client-IP"); 
    } 
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
      ip = request.getHeader("WL-Proxy-Client-IP"); 
    } 
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
      ip = request.getHeader("HTTP_CLIENT_IP"); 
    } 
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
      ip = request.getHeader("HTTP_X_FORWARDED_FOR"); 
    } 
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
      ip = request.getRemoteAddr(); 
    } 
    return ip; 
  } 
   
}