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54

Chapter 2 First Servlets

Listing 2.12 WebClient.java (continued)

    inputPanel.add(buttonPanel, BorderLayout.SOUTH);

    add(inputPanel, BorderLayout.NORTH);

    Panel resultPanel = new Panel();

    resultPanel.setLayout(new BorderLayout());

    Label resultLabel =

      new Label("Results", Label.CENTER);

    resultLabel.setFont(headingFont);

    resultPanel.add(resultLabel, BorderLayout.NORTH);

    resultArea = new TextArea();

    resultArea.setFont(textFont);

    resultPanel.add(resultArea, BorderLayout.CENTER);

    Panel interruptPanel = new Panel();

    interruptButton = new Button("Interrupt Download");

    interruptButton.addActionListener(this);

    interruptButton.setFont(labelFont);

    interruptPanel.add(interruptButton);

    resultPanel.add(interruptPanel, BorderLayout.SOUTH);

    add(resultPanel, BorderLayout.CENTER);

    setSize(600, 700);

    setVisible(true);

  }

  public void actionPerformed(ActionEvent event) {

    if (event.getSource() == submitButton) {

      Thread downloader = new Thread(this);

      downloader.start();

    } else if (event.getSource() == interruptButton) {

      isInterrupted = true;

    } 

  }

  public void run() {

    isInterrupted = false;

    if (hasLegalArgs()) 

      new HttpClient(host, port, requestLine,

     requestHeaders, resultArea, this);

  }

  public boolean isInterrupted() {

    return(isInterrupted);

  }

  private boolean hasLegalArgs() {

    host = hostField.getTextField().getText();

    if (host.length() == 0) {

      report("Missing hostname");

      return(false);

    }

Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.

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