java 获得web访问者真实的IP

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package util;

import javax.servlet.http.HttpServletRequest;


public class GetIP  {
	public String getIpAddr(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; 
	}  
}