JSP獲取IP地址

package utils;

import javax.servlet.http.HttpServletRequest;

public class IPUtil {
	public static String getRemortIP(HttpServletRequest request) {
		if (request.getHeader("x-forwarded-for") == null) {
			return request.getRemoteAddr();
		}
		return request.getHeader("x-forwarded-for");
	}
	public static String getIpAddr(HttpServletRequest request) {
	    String ip = request.getHeader("x-forwarded-for");
	    if(null == ip || 0 == ip.length() || "unknown".equalsIgnoreCase(ip)) {
	        ip = request.getHeader("Proxy-Client-IP");
	    }
	    if(null == ip || 0 == ip.length() || "unknown".equalsIgnoreCase(ip)) {
	        ip = request.getHeader("WL-Proxy-Client-IP");
	    }
	    if(null == ip || 0 == ip.length() || "unknown".equalsIgnoreCase(ip)) {
	        ip = request.getHeader("X-Real-IP");
	    }
	    if(null == ip || 0 == ip.length() || "unknown".equalsIgnoreCase(ip)) {
	        ip = request.getRemoteAddr();
	    }
	    return ip;
	}
}