java获取ip地址

package com.landray.kmss.util;

import javax.servlet.http.HttpServletRequest;

/**
 * createBy Zhang

 *
 * createTime 2011-8-26 下午04:31:31
 *
 * desc
 *
 */
public class IPUtil {
	
	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;
	}
}