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1
12
13 package demo;
14
15 import javax.swing.*;
16 import javax.swing.event.*;
17 import java.awt.*;
18 import java.awt.event.*;
19 import java.net.*;
20 import java.io.*;
21
22
26
27 public class SwingBrowser extends JFrame implements HyperlinkListener,
28 ActionListener {
29 public static void main(String  [] args) {
30 if (args.length == 0)
31 new SwingBrowser();
32 else
33 new SwingBrowser(args[0]);
34 }
35
36 private JButton homeButton;
37 private JTextField urlField;
38 private JEditorPane htmlPane;
39 private String initialURL;
40
41 public SwingBrowser() { this(""); }
42
43 public SwingBrowser(String initialURL) {
44 super("Simple Swing Browser");
45 this.initialURL = initialURL;
46
47 JPanel topPanel = new JPanel();
48 topPanel.setLayout(new BorderLayout());
49 JPanel buttonPanel = new JPanel();
50 buttonPanel.setLayout(new FlowLayout());
51 topPanel.add(buttonPanel, BorderLayout.WEST);
52
53 homeButton = new JButton();
54 homeButton.setIcon(new ImageIcon(getClass().getResource("/demo/Homepage.png")));
55 homeButton.addActionListener(this);
56 urlField = new JTextField(100);
57 urlField.setText(initialURL);
58 topPanel.add(urlField, BorderLayout.CENTER);
59
60 urlField.addKeyListener(new KeyListener() {
61 public void keyPressed(KeyEvent k) {
62 if (k.getKeyCode() == KeyEvent.VK_ENTER) {
63 String url = urlField.getText();
64 try {
65 htmlPane.setPage(new URL(url));
66 urlField.setText(url);
67 } catch(IOException ioe) {
68 warnUser("Can't follow link to " + url + ": " + ioe);
69 }
70 }
71 }
72 public void keyReleased(KeyEvent k) {}
73 public void keyTyped(KeyEvent k) {
74 }
75 });
76
77 buttonPanel.add(homeButton);
78
79 getContentPane().add(topPanel, BorderLayout.NORTH);
80
81 String sample = "<html><body><h2>Test HTML</h2><p>This is a simple browser test. Type in a URL at the top to go to a new location, or hit the home button to go back to the URL you supplied.</p></body></html>";
82
83 try {
84 if (initialURL.equals(""))
85 htmlPane = new JEditorPane("text/html", sample);
86 else
87 htmlPane = new JEditorPane(initialURL);
88 htmlPane.setEditable(false);
89 htmlPane.addHyperlinkListener(this);
90 JScrollPane scrollPane = new JScrollPane(htmlPane);
91 getContentPane().add(scrollPane, BorderLayout.CENTER);
92 } catch(IOException ioe) {
93 warnUser("Can't build HTML pane for " + initialURL
94 + ": " + ioe);
95 }
96
97 Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
98 int width = screenSize.width * 8 / 10;
99 int height = screenSize.height * 8 / 10;
100 setBounds(width/8, height/8, width, height);
101 setVisible(true);
102 }
103
104 public void actionPerformed(ActionEvent event) {
105 String url = initialURL;
106 if (url.equals("")) {
107 warnUser("You didn't supply an initial home URL!");
108 return;
109 }
110 try {
111 htmlPane.setPage(new URL(url));
112 urlField.setText(url);
113 } catch(IOException ioe) {
114 warnUser("Can't follow link to " + url + ": " + ioe);
115 }
116 }
117
118 public void hyperlinkUpdate(HyperlinkEvent event) {
119 if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
120 try {
121 htmlPane.setPage(event.getURL());
122 urlField.setText(event.getURL().toExternalForm());
123 } catch(IOException ioe) {
124 warnUser("Can't follow link to "
125 + event.getURL().toExternalForm() + ": " + ioe);
126 }
127 }
128 }
129
130 private void warnUser(String message) {
131 JOptionPane.showMessageDialog(this, message, "Error",
132 JOptionPane.ERROR_MESSAGE);
133 }
134 }
135
136 |
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Java API By Example, From Geeks To Geeks.