java 獲得訪問者的IP

import javax.servlet.http.HttpServletRequest;   

  

  

public class getRequestIP  {   

    public 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.getRemoteAddr();    

        }    

        return ip;    

    }     

}