JOptionPane.showMessageDialog (WebBrowser.this,"請輸入鏈接地址","網頁瀏覽器",JOptionPane.ERROR_MESSAGE);
            }
        }
        //另存為...
        else if (e.getSource() == picSave||e.getSource() == saveAsItem){
            url = jurl.getText ().toString ().trim(); 
            if(url.length ()>0&&!url.startsWith ("http://")) { 
                url="http://"+url; 
            } 
            if(!url.equals ("")) { 
                //保存文件
                saveFile(url); 
            } 
            else { 
                JOptionPane.showMessageDialog (WebBrowser.this,"請輸入鏈接地址","網頁瀏覽器",JOptionPane.ERROR_MESSAGE); 
            } 
        }
        //退出
        else if (e.getSource() == exitItem ||e.getSource() == picExit){
            System.exit(0);
        }
        //后退
        else if (e.getSource() == backItem ||e.getSource() == picBack){
            historyIndex--; 
            if(historyIndex < 0) 
                historyIndex = 0; 
            url = jurl.getText();
            try{
                //獲得history對象中本地址之前訪問的地址
                url = (String)history.get(historyIndex);
                jEditorPane1.setPage(url); 
                jurl.setText(url.toString());
		jEditorPane1.setEditable(false); //add by copy editor :)
                jEditorPane1.revalidate (); 
            }
            catch(Exception ex){
            }
        }
        //前進
        else if (e.getSource() == forwardItem ||e.getSource() == picForward){
            historyIndex++; 
            if(historyIndex >= history.size()) 
                    historyIndex = history.size()-1; 
            url = jurl.getText();
            try{
                //獲得history對象中本地址之后訪問的地址
                url = (String)history.get(historyIndex);
                jEditorPane1.setPage(url); 
                jurl.setText(url.toString());
		jEditorPane1.setEditable(false); //add by copy editor :)
                jEditorPane1.revalidate (); 
            }
            catch(Exception ex){
            }
        }
        //全屏
        else if (e.getSource() == fullscreenItem){
            boolean add_button2=true; 
            //獲得屏幕大小
            Dimension size = Toolkit.getDefaultToolkit().getScreenSize(); 

            Container content = window.getContentPane(); 
            content.add (bar,"North"); 
            content.add (scrollPane,"Center"); 
                
            //button2為點擊“全屏”后的還原按鈕
            if(add_button2==true) { 
                bar.add (button2); 
            } 
            //為button2添加事件
            button2.addActionListener (new ActionListener () { 
                public void actionPerformed (ActionEvent evt) { 
                    WebBrowser.this.setEnabled (true); 
                    window.remove (bar);
                    window.remove (toolBar);
                    window.remove (scrollPane); 
                    window.setVisible (false); 
                    
                    scrollPane.setPreferredSize (new Dimension (100,500)); 
                    getContentPane ().add (scrollPane,BorderLayout.SOUTH); 
                    getContentPane ().add (bar,BorderLayout.CENTER); 
                    getContentPane ().add (toolBar,BorderLayout.NORTH); 
                    bar.remove (button2);
                    pack(); 
                } 
            });
            window.setSize (size); 
            window.setVisible (true); 
        }
        //查看源文件
        else if (e.getSource() == sourceItem ||e.getSource() == picView){
            url = jurl.getText ().toString ().trim (); 
                if(url.length ()>0&&!url.startsWith ("http://")) { 
                    url="http://"+url; 
                } 
                if( !url.equals ("")) {
                    //根據url，獲得源代碼
                    getHtmlSource (url); 
                    //生成顯示源代碼的框架對象
                    ViewSourceFrame vsframe = new ViewSourceFrame (htmlSource); 
                    vsframe.setBounds (0,0,800,500); 
                    vsframe.setVisible(true); 
                } 
                else { 
                    JOptionPane.showMessageDialog (WebBrowser.this,"請輸入鏈接地址","網頁瀏覽器",JOptionPane.ERROR_MESSAGE); 
                } 
        }
        //刷新
        else if (e.getSource() == reloadItem){
            url=jurl.getText (); 
            if(url.length ()>0&&url.startsWith ("http://")) { 
                try { 
                    jEditorPane1.setPage (url); 
		    jEditorPane1.setEditable(false); //add by copy editor :)
                    jEditorPane1.revalidate (); 
                } 
                catch(Exception ex) { 
                } 
            } 
            else if(url.length ()>0&&!url.startsWith ("http://")) { 
                url="http://"+url; 
                try { 
                    jEditorPane1.setPage (url ); 
		    jEditorPane1.setEditable(false); //add by copy editor :)
                    jEditorPane1.revalidate (); 
                } 
                catch(Exception ex) { 
                } 
            } 
        }
    }
    
    /*
    **保存文件
    */
    void saveFile (final String url) { 
        final String linesep = System.getProperty ("line.separator"); 
        chooser1.setCurrentDirectory (new File (".")); 
        chooser1.setDialogType (JFileChooser.SAVE_DIALOG); 
        chooser1.setDialogTitle ("另存為..."); 
        if(chooser1.showSaveDialog (this) != JFileChooser.APPROVE_OPTION) 
            return; 
        this.repaint (); 
        Thread thread = new Thread () { 
            public void run () { 
                try { 
                    java.net.URL source = new URL (url); 
                    InputStream in = new BufferedInputStream (source.openStream ()); 
                    BufferedReader br=new BufferedReader (new InputStreamReader (in)); 
                    File fileName = chooser1.getSelectedFile (); 
                    FileWriter out = new FileWriter (fileName);
                    BufferedWriter bw = new BufferedWriter (out); 
                    String line; 
                    while((line = br.readLine ()) != null) { 
                        bw.write (line); 
                        bw.newLine (); 
                    } 
                    bw.flush (); 
                    bw.close (); 
                    out.close (); 
                    String dMessage = url + " 已經被保存至"+ linesep +fileName.getAbsolutePath (); 
                    String dTitle = "另存為"; 
                    int dType = JOptionPane.INFORMATION_MESSAGE; 
                    JOptionPane.showMessageDialog ((Component) null,dMessage,dTitle,dType); 
                } 
                catch(java.net.MalformedURLException muex) { 
                    JOptionPane.showMessageDialog ((Component)null,muex.toString (),"網頁瀏覽器",JOptionPane.ERROR_MESSAGE); 
                } 
                catch(Exception ex) { 
                    JOptionPane.showMessageDialog ((Component) null,ex.toString (),"網頁瀏覽器",JOptionPane.ERROR_MESSAGE); 
                } 
            } 
        }; 
        thread.start (); 
    } 

    /*
    **獲得源代碼
    */
    void getHtmlSource (String url) { 
        String linesep,htmlLine; 
        linesep = System.getProperty ("line.separator"); 
        htmlSource =""; 
        try { 
            java.net.URL source = new URL (url); 
            InputStream in = new BufferedInputStream (source.openStream ()); 
            BufferedReader br = new BufferedReader ( new InputStreamReader (in)); 
            while((htmlLine = br.readLine ())!=null) { 
                htmlSource = htmlSource +htmlLine+linesep; 
            } 
        } 
        catch(java.net.MalformedURLException muex) { 
            JOptionPane.showMessageDialog (WebBrowser.this,muex.toString (),"網頁瀏覽器",JOptionPane.ERROR_MESSAGE); 
        } 
        catch(Exception e) { 
            JOptionPane.showMessageDialog (WebBrowser.this,e.toString (),"網頁瀏覽器",JOptionPane.ERROR_MESSAGE); 
        } 
    } 
    
    /**
    **實現監聽器接口的hyperlinkUpdate函數
    */
    public void hyperlinkUpdate (HyperlinkEvent e) { 
    /*    if(e.getEventType () == HyperlinkEvent.EventType.ACTIVATED) { 
            String url = jurl.getText();
            if(url.length ()>0&&url.startsWith ("http://")) { 
                try { 
                    jEditorPane1.setPage (url); 
                    jEditorPane1.revalidate (); 
                } 
                catch(Exception ex) { 
                } 
            } 
            else if(url.length ()>0&&!url.startsWith ("http://")) { 
                url="http://"+url; 
                try { 
                    jEditorPane1.setPage (url ); 
                    jEditorPane1.revalidate (); 
                } 
                catch(Exception ex) { 
                } 
            } 
        } 
    */ 
    // Revised by copy editor :) Now with new code to help hyperlink
	try {
 		if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED)
 			jEditorPane1.setPage(e.getURL());
 		} catch (Exception ex) {
 			ex.printStackTrace(System.err);
 		}
    } 
    
    /*生成一個IE對象*/
    public static void main (String [] args){ 
        try{
            UIManager.setLookAndFeel(
                UIManager.getCrossPlatformLookAndFeelClassName() 
            );
        }
        catch(Exception e){
        }

        WebBrowser webBrowser = new WebBrowser ();
        webBrowser.pack();
        webBrowser.setVisible(true);
    } 
}