java得到IP地址的一些方法

package util;

import javax.servlet.http.HttpServletRequest;

public class GetIpUtil {

    public static String getRemoteIP(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.getRemoteAddr();
        }
        return ip;

    }

}