public static String getIpAddr(HttpServletRequest request) {
		try {
			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.getRemoteAddr();
				if (ip.equals("127.0.0.1")||ip.equals("0:0:0:0:0:0:0:1")) {
					// 根據網絡卡取本機配置的IP
					InetAddress inet = InetAddress.getLocalHost();
					ip = inet.getHostAddress();

					// 對於通過多個代理的情況，第一個IP為客戶端真實IP,多個IP按照','分割
					if (ip != null && ip.length() > 15) { // "***.***.***.***".length()
															// = 15
						if (ip.indexOf(",") > 0) {
							ip = ip.substring(0, ip.indexOf(","));
						}
					}
				}
			}
			if (ip != null && ip.length() > 15) { // "***.***.***.***".length()
													// = 15
				if (ip.indexOf(",") > 0) {
					ip = ip.substring(0, ip.indexOf(","));
				}
			}
			return ip;
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}