获取访问Ip

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();   
    }   
    System.out.println("*****************"+ip);