java获取用户IP地址

    /**
	 * 获取用户IP.
	 * @param req
	 * @return
	 */
	protected static String getIp(HttpServletRequest req){
		String ip = req.getHeader("x-forwarded-for");
	    if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)){
	        ip = req.getHeader("Proxy-Client-IP");
	    }
	    if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)){
	        ip = req.getHeader("WL-Proxy-Client-IP");
	    }
	    if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)){
	        ip = req.getRemoteAddr();
	    }
	    ip = ip.equals("0:0:0:0:0:0:0:1")?"127.0.0.1":ip;
	    return ip;
	}