webbrowser.java

用java实现的一个简易的网页浏览器

          *
          **/
         }
       catch(Exception ex){
        
        }
      }
      
      //forworad..... 
     else if(e.getSource()==forwardItem||e.getSource()==picForward){
       historyIndex++;
       if(historyIndex>=history.size())
        historyIndex=history.size()-1;
        url=jurl.getText();
        try{
           url=(String)history.get(historyIndex);
           jEditorPane1.setPage(url);
           jurl.setText(url.toString());
              jEditorPane1.setEditable(false);
           jEditorPane1.revalidate();
         }
         catch(Exception ex){
          }
      
      } 
       
     //fullscreen
     else if(e.getSource()==fullscreenItem){
        boolean add_button2=true;
        
      } 
       
       
       
     //查看原文件  
     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("")){
         getHtmlSource(url);
         ViewSourceFrame vsframe=new ViewSourceFrame(htmlSource);
         vsframe.setBounds(0,0,800,500);
         vsframe.setVisible(true);
        }
       else{
         JOptionPane.showMessageDialog(WebBrowser.this,"请输入链接地址","网页浏览器",JOptionPane.ERROR_MESSAGE);
        
        }
      } 
       
     
       //....................收藏夹
     
       //................
      
      //刷新
      else if(e.getSource()==reloadItem){
         url=jurl.getText();
         if(url.length()>0&&url.startsWith("http://")){
            try{
               jEditorPane1.setPage(url);
               jEditorPane1.setEditable(false);
               jEditorPane1.revalidate();
             }
             
             catch(Exception ex){
              }
              
        
          }
          
          
          else if(url.length()>0&&!url.startsWith("http://")){
            url="http://"+url;
            try{
              jEditorPane1.setPage(url);
                  jEditorPane1.setEditable(false);
                  jEditorPane1.revalidate();
             }
             catch(Exception ex){
              }
           }
       }  
     }
     //.............savefile
     void saveFile(final String url){
        final String linesep=System.getProperty("line.separator");//获得指定键指示的系统属性
        chooser1.setCurrentDirectory(new File("."));//设置当前目录
        chooser1.setDialogType(JFileChooser.SAVE_DIALOG);//设置此对话框的类型,||指示 JFileChooser 支持 "Save" 文件操作的类型值
        chooser1.setDialogTitle("另存为");//设置显示在 JFileChooser 窗口标题栏的字符串
        if(chooser1.showSaveDialog(this)!=JFileChooser.APPROVE_OPTION)// 弹出一个 "Save File" 文件选择器对话框||选择确认（yes、ok）后返回该值
         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();//返回选中的文件
             FileWriter out=new FileWriter(fileName);
             BufferedWriter bw=new BufferedWriter(out);
             String line;
             while((line=br.readLine())!=null){
              bw.write(line);
              bw.newLine();//写入一个行分隔符
              }
              
             bw.flush();
             bw.close();
             out.close();
             String dMessage=url+" 已经被保存至"+linesep+fileName.getAbsolutePath();//返回抽象路径名的绝对路径名字符串
             String dTitle="另存为";
             int dType=JOptionPane.INFORMATION_MESSAGE;
             JOptionPane.showMessageDialog((Component)null,dMessage,dTitle,dType);
             }
            catch(java.net.MalformedURLException muex){
             JOptionPane.showMessageDialog((Component)null,muex.toString(),"网页浏览器",JOptionPane.ERROR_MESSAGE);
             }
            catch(Exception ex){
             JOptionPane.showMessageDialog((Component)null,ex.toString(),"网页浏览器",JOptionPane.ERROR_MESSAGE);
             
             
                 }  
             
             }
            
            };
            thread.start();
          
          
      
      }
     //....................
     
     //getsource
     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(),"网页浏览器",JOptionPane.ERROR_MESSAGE);
        }
        
       catch(Exception e){
        JOptionPane.showMessageDialog(WebBrowser.this,e.toString(),"网页浏览器",JOptionPane.ERROR_MESSAGE);
        
        }
      
      }
    //............
     public void hyperlinkUpdate(HyperlinkEvent e)
     
     {
      try{
       if(e.getEventType()==HyperlinkEvent.EventType.ACTIVATED)
        
        
        jEditorPane1.setPage(e.getURL());
        jurl.setText(e.getURL().toString());
        history.add(e.getURL().toString());
        historyIndex=history.size()-1;
        
        
       }
      catch(Exception ex){
       ex.printStackTrace(System.err);
       }
     }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        
        try {
         
         UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());//使用 LookAndFeel 对象设置当前的默认外观
         
        }
        catch(Exception e)
        {
     
        }
        
        WebBrowser webBrowser=new WebBrowser();
        webBrowser.pack();
        webBrowser.setVisible(true);
    }
    
    
    
    
    
    class JEditorPane2 extends JEditorPane implements MouseListener {
  private static final long serialVersionUID = -2308615404205560110L;
  private JPopupMenu pop = null; // 弹出菜单
  private JMenuItem copy = null, paste = null, cut = null; // 三个功能菜单
  public JEditorPane2() {
   super();
   init();
  }
  private void init() {
   this.addMouseListener(this);
   pop = new JPopupMenu();
   pop.add(copy = new JMenuItem("复制"));
   pop.add(paste = new JMenuItem("粘贴"));
   pop.add(cut = new JMenuItem("剪切"));
   copy.setAccelerator(KeyStroke.getKeyStroke('C', InputEvent.CTRL_MASK));
   paste.setAccelerator(KeyStroke.getKeyStroke('V', InputEvent.CTRL_MASK));
   cut.setAccelerator(KeyStroke.getKeyStroke('X', InputEvent.CTRL_MASK));
   copy.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
     action(e);
    }
   });
   paste.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
     action(e);
    }
   });
   cut.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
     action(e);
    }
   });
   this.add(pop);
  }
  /**
   * 菜单动作
   * @param e
   */
  public void action(ActionEvent e) {
   String str = e.getActionCommand();
   if (str.equals(copy.getText())) { // 复制
    this.copy();
   } else if (str.equals(paste.getText())) { // 粘贴
    this.paste();
   } else if (str.equals(cut.getText())) { // 剪切
    this.cut();
   }
  }
  public JPopupMenu getPop() {
   return pop;
  }
  public void setPop(JPopupMenu pop) {
   this.pop = pop;
  }
  /**
   * 剪切板中是否有文本数据可供粘贴
   * 
   * @return true为有文本数据
   */
  public boolean isClipboardString() {
   boolean b = false;
   Clipboard clipboard = this.getToolkit().getSystemClipboard();
   Transferable content = clipboard.getContents(this);
   try {
    if (content.getTransferData(DataFlavor.stringFlavor) instanceof String) {
     b = true;
    }
   } catch (Exception e) {
   }
   return b;
  }
  /**
   * 文本组件中是否具备复制的条件
   * 
   * @return true为具备
   */
  public boolean isCanCopy() {
   boolean b = false;
   int start = this.getSelectionStart();
   int end = this.getSelectionEnd();
   if (start != end)
    b = true;
   return b;
  }
  public void mouseClicked(MouseEvent e) {
  }
  public void mouseEntered(MouseEvent e) {
  }
  public void mouseExited(MouseEvent e) {
  }
  public void mousePressed(MouseEvent e) {
   if (e.getButton() == MouseEvent.BUTTON3) {
    copy.setEnabled(isCanCopy());
    paste.setEnabled(isClipboardString());
    cut.setEnabled(isCanCopy());
    pop.show(this, e.getX(), e.getY());
   }
  }
  public void mouseReleased(MouseEvent e) {
  }
 }
}