Java - JEditorPane - 超链接问题

Question

我必须编写基于JEditorPane的WebBrowser应用程序 - 上学。

我有一点麻烦，超链接不起作用。

这里是我的代码：

public class BrowserFrame extends javax.swing.JFrame implements HyperlinkListener { 

    /** Creates new form BrowserFrame */ 
    public BrowserFrame() { 
     initComponents(); 
    } 

    /** This method is called from within the constructor to 
    * initialize the form. 
    * WARNING: Do NOT modify this code. The content of this method is 
    * always regenerated by the Form Editor. 
    */ 
    @SuppressWarnings("unchecked") 
    // <editor-fold defaultstate="collapsed" desc="Generated Code"> 
    private void initComponents() { 
     java.awt.GridBagConstraints gridBagConstraints; 

     jPanel1 = new javax.swing.JPanel(); 
     btnBack = new javax.swing.JButton(); 
     btnForward = new javax.swing.JButton(); 
     btnRefresh = new javax.swing.JButton(); 
     tfURL = new javax.swing.JTextField(); 
     btnGo = new javax.swing.JButton(); 
     jScrollPane1 = new javax.swing.JScrollPane(); 
     epBrowser = new javax.swing.JEditorPane(); 
     jMenuBar1 = new javax.swing.JMenuBar(); 
     jMenu1 = new javax.swing.JMenu(); 
     jMenu2 = new javax.swing.JMenu(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 
     setTitle("Java Browser"); 
     setMinimumSize(new java.awt.Dimension(300, 300)); 
     setName("fMain"); // NOI18N 
     getContentPane().setLayout(new java.awt.GridBagLayout()); 

     jPanel1.setPreferredSize(new java.awt.Dimension(100, 25)); 
     jPanel1.setLayout(new java.awt.GridBagLayout()); 

     btnBack.setText("<"); 
     jPanel1.add(btnBack, new java.awt.GridBagConstraints()); 

     btnForward.setText(">"); 
     jPanel1.add(btnForward, new java.awt.GridBagConstraints()); 

     btnRefresh.setText("Odśwież"); 
     jPanel1.add(btnRefresh, new java.awt.GridBagConstraints()); 

     tfURL.setText("http://www.google.com"); 
     gridBagConstraints = new java.awt.GridBagConstraints(); 
     gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH; 
     gridBagConstraints.weightx = 1.0; 
     jPanel1.add(tfURL, gridBagConstraints); 

     btnGo.setText("Idź"); 
     btnGo.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       btnGoActionPerformed(evt); 
      } 
     }); 
     jPanel1.add(btnGo, new java.awt.GridBagConstraints()); 

     gridBagConstraints = new java.awt.GridBagConstraints(); 
     gridBagConstraints.gridwidth = java.awt.GridBagConstraints.REMAINDER; 
     gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL; 
     getContentPane().add(jPanel1, gridBagConstraints); 

     epBrowser.setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR)); 
     jScrollPane1.setViewportView(epBrowser); 

     gridBagConstraints = new java.awt.GridBagConstraints(); 
     gridBagConstraints.gridwidth = java.awt.GridBagConstraints.REMAINDER; 
     gridBagConstraints.gridheight = java.awt.GridBagConstraints.REMAINDER; 
     gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH; 
     gridBagConstraints.weightx = 1.0; 
     gridBagConstraints.weighty = 1.0; 
     getContentPane().add(jScrollPane1, gridBagConstraints); 

     jMenu1.setText("Plik"); 
     jMenuBar1.add(jMenu1); 

     jMenu2.setText("Historia"); 
     jMenuBar1.add(jMenu2); 

     setJMenuBar(jMenuBar1); 

     pack(); 
    }// </editor-fold> 


    private void btnGoActionPerformed(java.awt.event.ActionEvent evt) { 
     String url; 
     epBrowser.setContentType("text/html"); 
     try { 
      url = tfURL.getText(); 
      if (url.startsWith("http://")) 
      url = url.substring(7); 
      epBrowser.setPage("http://"+url); 

     } catch (IOException ex) { 
      Logger.getLogger(BrowserFrame.class.getName()).log(Level.SEVERE, null, ex); 
     } 

    } 

    public void hyperlinkUpdate(HyperlinkEvent event) { 
    if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED) { 
      try { 
       epBrowser.setPage(event.getURL()); 
       tfURL.setText(event.getURL().toExternalForm()); 
      } catch (IOException ex) { 
       Logger.getLogger(BrowserFrame.class.getName()).log(Level.SEVERE, null, ex); 
      } 
    } 
    } 

    public static void main(String args[]) { 
     java.awt.EventQueue.invokeLater(new Runnable() { 
      public void run() { 
       new BrowserFrame().setVisible(true); 
      } 
     }); 
    } 

    // Variables declaration - do not modify 
    private javax.swing.JButton btnBack; 
    private javax.swing.JButton btnForward; 
    private javax.swing.JButton btnGo; 
    private javax.swing.JButton btnRefresh; 
    private javax.swing.JEditorPane epBrowser; 
    private javax.swing.JMenu jMenu1; 
    private javax.swing.JMenu jMenu2; 
    private javax.swing.JMenuBar jMenuBar1; 
    private javax.swing.JPanel jPanel1; 
    private javax.swing.JScrollPane jScrollPane1; 
    private javax.swing.JTextField tfURL; 
    // End of variables declaration 

} 

Answer 1

见2线的变化。

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.event .*; 
import java.io.IOException; 
import java.util.logging.*; 

public class BrowserFrame extends JFrame implements HyperlinkListener { 

    /** Creates new form BrowserFrame */ 
    public BrowserFrame() { 
     initComponents(); 
    } 

    /** This method is called from within the constructor to 
    * initialize the form. */ 
    private void initComponents() { 
     GridBagConstraints gridBagConstraints; 

     jPanel1 = new JPanel(); 
     btnBack = new JButton(); 
     btnForward = new JButton(); 
     btnRefresh = new JButton(); 
     tfURL = new JTextField(); 
     btnGo = new JButton(); 
     jScrollPane1 = new JScrollPane(); 
     epBrowser = new JEditorPane(); 

     // this is the trick! 
     epBrowser.setEditable(false); 
     epBrowser.addHyperlinkListener(this);  

     jMenuBar1 = new JMenuBar(); 
     jMenu1 = new JMenu(); 
     jMenu2 = new JMenu(); 

     setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
     setTitle("Java Browser"); 
     setMinimumSize(new Dimension(300, 300)); 
     setName("fMain"); // NOI18N 
     getContentPane().setLayout(new GridBagLayout()); 

     jPanel1.setPreferredSize(new Dimension(100, 25)); 
     jPanel1.setLayout(new GridBagLayout()); 

     btnBack.setText("<"); 
     jPanel1.add(btnBack, new GridBagConstraints()); 

     btnForward.setText(">"); 
     jPanel1.add(btnForward, new GridBagConstraints()); 

     btnRefresh.setText("Odswiez"); 
     jPanel1.add(btnRefresh, new GridBagConstraints()); 

     tfURL.setText("http://www.google.com"); 
     gridBagConstraints = new GridBagConstraints(); 
     gridBagConstraints.fill = GridBagConstraints.BOTH; 
     gridBagConstraints.weightx = 1.0; 
     jPanel1.add(tfURL, gridBagConstraints); 

     btnGo.setText("Idz"); 
     btnGo.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent evt) { 
       btnGoActionPerformed(evt); 
      } 
     }); 
     jPanel1.add(btnGo, new GridBagConstraints()); 

     gridBagConstraints = new GridBagConstraints(); 
     gridBagConstraints.gridwidth = GridBagConstraints.REMAINDER; 
     gridBagConstraints.fill = GridBagConstraints.HORIZONTAL; 
     getContentPane().add(jPanel1, gridBagConstraints); 

     epBrowser.setCursor(new Cursor(Cursor.DEFAULT_CURSOR)); 
     jScrollPane1.setViewportView(epBrowser); 

     gridBagConstraints = new GridBagConstraints(); 
     gridBagConstraints.gridwidth = GridBagConstraints.REMAINDER; 
     gridBagConstraints.gridheight = GridBagConstraints.REMAINDER; 
     gridBagConstraints.fill = GridBagConstraints.BOTH; 
     gridBagConstraints.weightx = 1.0; 
     gridBagConstraints.weighty = 1.0; 
     getContentPane().add(jScrollPane1, gridBagConstraints); 

     jMenu1.setText("Plik"); 
     jMenuBar1.add(jMenu1); 

     jMenu2.setText("Historia"); 
     jMenuBar1.add(jMenu2); 

     setJMenuBar(jMenuBar1); 

     pack(); 
    }// </editor-fold> 


    private void btnGoActionPerformed(ActionEvent evt) { 
     String url; 
     epBrowser.setContentType("text/html"); 
     try { 
      url = tfURL.getText(); 
      if (url.startsWith("http://")) 
      url = url.substring(7); 
      epBrowser.setPage("http://"+url); 

     } catch (IOException ex) { 
      Logger.getLogger(BrowserFrame.class.getName()).log(Level.SEVERE, null, ex); 
     } 

    } 

    public void hyperlinkUpdate(HyperlinkEvent event) { 
    if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED) { 
      try { 
       epBrowser.setPage(event.getURL()); 
       tfURL.setText(event.getURL().toExternalForm()); 
      } catch (IOException ex) { 
       Logger.getLogger(BrowserFrame.class.getName()).log(Level.SEVERE, null, ex); 
      } 
    } 
    } 

    public static void main(String args[]) { 
     EventQueue.invokeLater(new Runnable() { 
      public void run() { 
       new BrowserFrame().setVisible(true); 
      } 
     }); 
    } 

    // Variables declaration - do not modify 
    private JButton btnBack; 
    private JButton btnForward; 
    private JButton btnGo; 
    private JButton btnRefresh; 
    private JEditorPane epBrowser; 
    private JMenu jMenu1; 
    private JMenu jMenu2; 
    private JMenuBar jMenuBar1; 
    private JPanel jPanel1; 
    private JScrollPane jScrollPane1; 
    private JTextField tfURL; 
    // End of variables declaration 

}