L2jBrasilRequest.java

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import javax.servlet.http.HttpServletRequest;

 //...
private HttpServletRequest request;

 
 // Your class here (...)
 
public String getUserIP(){
  //Top L2jBrasil use only trusth real IP
  String proxyIp = request.getHeader("X-FORWARDED-FOR");
  String cloudFlareIP = request.getHeader("CF_CONNECTING_IP");
  
  if(cloudFlareIP != null){
    return cloudFlareIP;
  }
  
  if (ipAddress != null) {
  	   return ipAddress;
  }
  
  return request.getRemoteAddr();
}

public boolean validateVote(String Ip) throws Exception {
    String UserName = "yourusername";
		String url = "http://top.l2jbrasil.com/votesystem/?ip="+  getUserIP() + "&username="+UserName;
    String userAgent = request.getHeader("User-Agent"); 
    
		URL obj = new URL(url);
		HttpURLConnection con = (HttpURLConnection) obj.openConnection();
		con.setRequestMethod("GET");
		//add request header
		con.setRequestProperty("User-Agent", userAgent);//L2jBrasil Only Accept a valid user agente, so clone the user useragent

		int responseCode = con.getResponseCode();
		if(responseCode == 200){
		  BufferedReader in = new BufferedReader(
		        new InputStreamReader(con.getInputStream()));
  		String inputLine;
  		StringBuffer response = new StringBuffer();
  
  		while ((inputLine = in.readLine()) != null) {
  			response.append(inputLine);
  		}
  		in.close();
  
  		//print result
  		System.out.println(response.toString());
		}else{
		  	System.out.println("\nSending 'GET' request to URL : " + url);
		    System.out.println("Response Code : " + responseCode);
		}
	

		

	}