RequestUtil.java

package com.github.ouyangbob.request;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.StringUtils;

public class RequestUtil {


    public static 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();
        }
        if(StringUtils.isNotEmpty(ip) && !"unknown".equalsIgnoreCase(ip)){
        	String[] strIps = StringUtils.stripToEmpty(ip).split(",");
        	if(strIps != null && strIps.length >1){
        		return StringUtils.stripToEmpty(strIps[1]);
        	}
        }
        return ip;
    }
    
}