java 获取IP地址

java 获取IP地址

 public class IPUtils {
           	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 == 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");
	           	        }
	           			// 如果是多级代理，那么取第一个ip为客户ip
	           	        if (ip != null && ip.indexOf(",") != -1) {
	           	            ip = ip.substring(ip.lastIndexOf(",") + 1, ip.length()).trim();
	           	        }
	           	        return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : ip;
	           		} catch (Exception e) {
	           			// TODO: handle exception
	           			e.printStackTrace();
	           		}
	           		return null;
	            }           
          	}