Prentice Hall and Sun Microsystems. Personal use only; do not redistribute.

17.6 An Applet That Sends POST Data

455

Listing 17.7 SendPost.java (continued)

                       "from a real Web server via HTTP,\n" +

                       "not from the local disk using\n" +

                       "a 'file:' URL. It is fine,\n" +

                       "however, if the Web server is\n" +

                       "running on your local system.";

      setEnabled(false);

    }

    hostField.getTextField().setText(host);

    inputPanel.add(hostField);

    portField =

      new LabeledTextField("Port ( 1 means default):", 4);

    String portString = String.valueOf(currentPage.getPort());

    portField.getTextField().setText(portString);

    inputPanel.add(portField);

    uriField =

      new LabeledTextField("URI:", 40);

    String defaultURI = "/servlet/coreservlets.ShowParameters";

    uriField.getTextField().setText(defaultURI);

    inputPanel.add(uriField);

    Canvas separator2 = new Canvas();

    inputPanel.add(separator2);

    sendButton = new Button("Submit Data");

    sendButton.addActionListener(this);

    Panel buttonPanel = new Panel();

    buttonPanel.add(sendButton);

    inputPanel.add(buttonPanel);

    add(inputPanel, BorderLayout.NORTH);

    resultsArea = new TextArea();

    resultsArea.setFont(new Font("Monospaced", Font.PLAIN, 14));

    resultsArea.setText(resultsMessage);

    add(resultsArea, BorderLayout.CENTER);

  }

  public void actionPerformed(ActionEvent event) {

    try {

      String protocol = currentPage.getProtocol();

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

      String portString = portField.getTextField().getText();

      int port;

      try {

        port = Integer.parseInt(portString);

      } catch(NumberFormatException nfe) {

        port =  1; // I.e., default port of 80

      }

      String uri = uriField.getTextField().getText();

      URL dataURL = new URL(protocol, host, port, uri);

      URLConnection connection = dataURL.openConnection();

      // Make sure browser doesn't cache this URL.

      connection.setUseCaches(false);

Home page for this book: www.coreservlets.com; Home page for sequel: www.moreservlets.com.

Servlet and JSP training courses by book's author: courses.coreservlets.com.