how to get accecs-token in java?

[shinehwan]

hurl success but java 

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package javaapplication14;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;

/**
 *
 * @author hwan
 */



public class javaapplication14 {
        
    public static void main(String[] args)   {
        // TODO code application logic here
        final String AUTH_HOST = "https://www.fitbit.com/oauth2/authorize"; 
        final String tokenRequestUrl = "https://api.fitbit.com/oauth2/token";
       
        final String CLIENT_ID = "227LKJ";
        final String REDIECRT_URI = "http://127.0.0.1";
        final String code = "d4a36beff00a18697e61129906ca649176a27818";
        final int expires_in_one_day = 86400;
        final int expires_in_one_week = 604800;
        final int expires_in_one_month = 2592000;
        final int expires_in_one_year = 31536000;
        
        
        HttpsURLConnection conn = null;
        OutputStreamWriter writer = null;
        BufferedReader reader = null;
        InputStreamReader isr = null;
       
        try {
            final String params = String.format("grant_type=authorization_code&redirect_uri=%s&client_id=%s&code=%s"
                                                        ,REDIECRT_URI,CLIENT_ID,code);
          
            final URL url = new URL(tokenRequestUrl);
            
            conn = (HttpsURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type:", "application/x-www-form-urlencoded");
            conn.setRequestProperty("Authorization", "Basic MjI3TEtKOmU5ZTM0NmY3ZDJiMDg4YWRmMzZlZWEwMjgzYjVmNzlh");
           
            
            writer = new OutputStreamWriter(conn.getOutputStream());
            writer.write(params);
            writer.flush();
            
            final int responseCode = conn.getResponseCode();
            System.out.println("\nSending 'POST' request to URL : " + AUTH_HOST);
            System.out.println("Post parameters : " + params);
            System.out.println("Response Code : " + responseCode);
            
            isr = new InputStreamReader(conn.getInputStream());
            reader = new BufferedReader(isr);
            final StringBuffer buffer = new StringBuffer();
            String line;
            while((line= reader.readLine()) != null) {
                buffer.append(line);
            }          
            
            System.out.println(buffer.toString());
            
        } catch (IOException e) {
            System.out.println(e);
        } finally {
            
            if (writer != null) {
                try {
                writer.close();
            } catch (Exception Ignore) {
            }
        }
        if (isr != null) {
            try {
                isr.close();
            } catch (Exception Ignore) {
                
            }
        }
      
    }
    

    }
}

I have tried to make a http request for getting the acess token
but always java say me this :

 i need help!!