NetUtil.java

package com.starcharge.base.util;

import javax.servlet.http.HttpServletRequest;

/**
 * 网络工具类
 * 
 * @author zhaohui
 * @version [版本号, 2016年12月17日]
 */
public final class NetUtil {
    
    /**
     * 得到客户端ip
     *
     * @param request 请求
     * @return 真实ip
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = null;
        // ipAddress = request.getRemoteAddr();
        ipAddress = request.getHeader("x-forwarded-for");
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ipAddress == null  || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddr();
            /*
             * if (ipAddress.equals("127.0.0.1")) { // 根据网卡取本机配置的IP InetAddress inet = null; try { inet =
             * InetAddress.getLocalHost(); } catch (UnknownHostException e) { e.printStackTrace(); } ipAddress =
             * inet.getHostAddress(); }
             */
        }
        
        // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length() = 15
            if (ipAddress.indexOf(",") > 0) {
                ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
            }
        }
        return ipAddress;
    }
}