import java.io.IOException;
import java.io.PrintStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
 
/**
 *
 * @author Duy Khang
 */
public class NewClass2 {
 
    private static String LOGIN_INPUT = "login";
    private static String LOGIN_VALUE = "LOGIN";
    private static String NICK_INPUT = "nick";
    private static String NICK_VALUE = "vodkhang";
    private static String PASS_INPUT = "pass";
    private static String PASS_VALUE = "vhnkozou";
    private static String CHECK_CODE_INPUT = "checkcode";
    private static String CHECK_CODE_VALUE = "";
 
    public static void main(String[] args) {
        try {
            URL url = new URL("http://sms.vn/send/login.jsp");
            URLConnection connection = url.openConnection();
            connection.setDoOutput(true);
 
            Scanner sc = new Scanner(connection.getInputStream());
            while (sc.hasNextLine()) {
                System.out.println(sc.nextLine());
            }
            Scanner sc2 = new Scanner(System.in);
            System.out.println("enter the check code value: ");
            CHECK_CODE_VALUE = sc2.nextLine();
 
            String encodedLoginUserName = URLEncoder.encode(NICK_VALUE, "UTF-8");
            String encodedLoginPassword = URLEncoder.encode(PASS_VALUE, "UTF-8");
 
 
            URLConnection connection1 = url.openConnection();
            connection1.setDoOutput(true);
            PrintStream output = new PrintStream(connection1.getOutputStream());
 
            StringBuilder request = new StringBuilder();
            request.append(LOGIN_INPUT);
            request.append("=");
            request.append(LOGIN_VALUE);
            request.append("&");
 
            request.append(NICK_INPUT);
            request.append("=");
            request.append(encodedLoginUserName);
            request.append("&");
 
            request.append(PASS_INPUT);
            request.append("=");
            request.append(encodedLoginPassword);
            request.append("&");
 
            request.append(CHECK_CODE_INPUT);
            request.append("=");
            request.append(CHECK_CODE_VALUE);
            System.out.println("request: " + request);
 
            output.println(request);
            System.out.println("----------------------------------------------------");
            Scanner sc3 = new Scanner(connection1.getInputStream());
            while (sc3.hasNextLine()) {
                System.out.println(sc3.nextLine());
            }
        } catch (MalformedURLException ex) {
            Logger.getLogger(NewClass1.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(NewClass1.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

 
import java.io.IOException;
import java.io.PrintStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
 
/**
 *
 * @author Duy Khang
 */
public class NewClass2 {
 
    private static String LOGIN_INPUT = "login";
    private static String LOGIN_VALUE = "LOGIN";
    private static String NICK_INPUT = "nick";
    private static String NICK_VALUE = "vodkhang";
    private static String PASS_INPUT = "pass";
    private static String PASS_VALUE = "xxxxx";
    private static String CHECK_CODE_INPUT = "checkcode";
    private static String CHECK_CODE_VALUE = "";
 
    public static void main(String[] args) {
        try {
            URL url = new URL("http://sms.vn/send/login.jsp");
            URLConnection connection = url.openConnection();
            connection.setDoOutput(true);
 
            Scanner sc = new Scanner(connection.getInputStream());
            while (sc.hasNextLine()) {
                System.out.println(sc.nextLine());
            }
            Scanner sc2 = new Scanner(System.in);
            System.out.println("enter the check code value: ");
            CHECK_CODE_VALUE = sc2.nextLine();
 
            String encodedLoginUserName = URLEncoder.encode(NICK_VALUE, "UTF-8");
            String encodedLoginPassword = URLEncoder.encode(PASS_VALUE, "UTF-8");
 
 
            URLConnection connection1 = url.openConnection();
            connection1.setDoOutput(true);
            PrintStream output = new PrintStream(connection1.getOutputStream());
 
            StringBuilder request = new StringBuilder();
            request.append(LOGIN_INPUT);
            request.append("=");
            request.append(LOGIN_VALUE);
            request.append("&");
 
            request.append(NICK_INPUT);
            request.append("=");
            request.append(encodedLoginUserName);
            request.append("&");
 
            request.append(PASS_INPUT);
            request.append("=");
            request.append(encodedLoginPassword);
            request.append("&");
 
            request.append(CHECK_CODE_INPUT);
            request.append("=");
            request.append(CHECK_CODE_VALUE);
            System.out.println("request: " + request);
 
            output.println(request);
            System.out.println("----------------------------------------------------");
            Scanner sc3 = new Scanner(connection1.getInputStream());
            while (sc3.hasNextLine()) {
                System.out.println(sc3.nextLine());
            }
        } catch (MalformedURLException ex) {
            Logger.getLogger(NewClass1.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(NewClass1.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}