//file: Post.javaimport java.net.*;import java.io.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Post extends JPanel implements ActionListener {  JTextField nameField, passwordField;  String postURL;  GridBagConstraints constraints = new GridBagConstraints(  );  void addGB( Component component, int x, int y ) {    constraints.gridx = x;  constraints.gridy = y;    add ( component, constraints );  }  public Post( String postURL ) {    this.postURL = postURL;    JButton postButton = new JButton("Post");    postButton.addActionListener( this );    setLayout( new GridBagLayout(  ) );    addGB( new JLabel("Name:"), 0,0 );    addGB( nameField = new JTextField(20), 1,0 );    addGB( new JLabel("Password:"), 0,1 );    addGB( passwordField = new JPasswordField(20),1,1 );    constraints.gridwidth = 2;    addGB( postButton, 0,2 );  }  public void actionPerformed(ActionEvent e) {    postData(  );  }  protected void postData(  ) {    StringBuffer sb = new StringBuffer(  );    sb.append( URLEncoder.encode("Name") + "=" );    sb.append( URLEncoder.encode(nameField.getText(  )) );    sb.append( "&" + URLEncoder.encode("Password") + "=" );    sb.append( URLEncoder.encode(passwordField.getText(  )) );    String formData = sb.toString(  );    try {      URL url = new URL( postURL );      HttpURLConnection urlcon =          (HttpURLConnection) url.openConnection(  );      urlcon.setRequestMethod("POST");      urlcon.setRequestProperty("Content-type",          "application/x-www-form-urlencoded");      urlcon.setDoOutput(true);      urlcon.setDoInput(true);      PrintWriter pout = new PrintWriter( new OutputStreamWriter(          urlcon.getOutputStream(  ), "8859_1"), true );      pout.print( formData );      pout.flush(  );      // read results...      if ( urlcon.getResponseCode(  ) != HttpURLConnection.HTTP_OK )        System.out.println("Posted ok!");      else {        System.out.println("Bad post...");        return;      }      //InputStream in = urlcon.getInputStream(  );      // ...    } catch (MalformedURLException e) {      System.out.println(e);     // bad postURL    } catch (IOException e2) {      System.out.println(e2);    // I/O error    }  }  public static void main( String [] args ) {    JFrame frame = new JFrame("SimplePost");    frame.getContentPane(  ).add( new Post( args[0] ), "Center" );    frame.pack(  );    frame.setVisible(true);  }}