15，获取ip的类

package com.nvli.chapter8.utils;

import javax.servlet.http.HttpServletRequest;

public final class LoggerUtils {

    public static final String LOGGER_RETURN="_logger_return";

    private LoggerUtils(){}

/**

     * 获取客户端IP地址

     */

   public static String getCliectIp(HttpServletRequest request){

            String ip=request.getHeader("x-forwarded-for");

 if(ip==null||ip.trim()==""|| "unknow".equalsIgnoreCase(ip)){

                ip=request.getHeader("Proxy-Client-Ip");

            }

 if(ip==null||ip.trim()==""||"unknow".equalsIgnoreCase(ip)){

                ip=request.getHeader("WL-Proxy-Client-Ip");

            }

if(ip==null||ip.trim()==""||"unknow".equalsIgnoreCase(ip)){

                ip=request.getRemoteAddr();

            }

   //多个路由时，取第一个非unknow的ip

            final String[]arr=ip.split(",");

            for (final String str:arr

                 ) {

           if(  !"unknown".equalsIgnoreCase(str)){

                    ip=str;

                    break;

                }
      }

        return ip;

        }

  /**

     * 判断是否为ajax请求

     * @param request

     * @return

     */

   public static String getRequestType(HttpServletRequest request){

            return  request.getHeader("X-Requested-With");

        }

}