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454

Chapter 17 Using Applets As Servlet Front Ends

Listing 17.7 SendPost.java 

import java.applet.Applet;

import java.awt.*;

import java.awt.event.*;

import java.net.*;

import java.io.*;

/** Applet that reads firstName, lastName, and

 *  emailAddress parameters and sends them via

 *  POST to the host, port, and URI specified.

 */

public class SendPost extends Applet

                      implements ActionListener {

  private LabeledTextField firstNameField, lastNameField,

                           emailAddressField, hostField,

                           portField, uriField;

  private Button sendButton;

  private TextArea resultsArea;

  URL currentPage;

  public void init() {

    setBackground(Color.white);

    setLayout(new BorderLayout());

    Panel inputPanel = new Panel();

    inputPanel.setLayout(new GridLayout(9, 1));

    inputPanel.setFont(new Font("Serif", Font.BOLD, 14));

    firstNameField =

      new LabeledTextField("First Name:", 15);

    inputPanel.add(firstNameField);

    lastNameField =

      new LabeledTextField("Last Name:", 15);

    inputPanel.add(lastNameField);

    emailAddressField =

      new LabeledTextField("Email Address:", 25);

    inputPanel.add(emailAddressField);

    Canvas separator1 = new Canvas();

    inputPanel.add(separator1);

    hostField =

      new LabeledTextField("Host:", 15);

    // Applets loaded over the network can only connect

    // to the server from which they were loaded.

    hostField.getTextField().setEditable(false);

    currentPage = getCodeBase();

    // getHost returns empty string for applets from local disk.

    String host = currentPage.getHost();

    String resultsMessage = "Results will be shown here...";

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

      resultsMessage = "Error: you must load this applet\n" +

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