webbrowser.java

基于Java的浏览器的设计与实现。该浏览器的设计与实现是用Java语言开发的。该设计可以满足用户的需求

                    history.add(url);
                    historyIndex=history.size()-1;
		    jEditorPane1.setEditable(false); //add by copy editor :)
                    jEditorPane1.revalidate ();
                }
                catch(Exception ex) {
                    JOptionPane.showMessageDialog (WebBrowser.this,"无法打开该搜索页","网页浏览器",JOptionPane.ERROR_MESSAGE);
                }
            }
            else if(url.length ()==0){
                JOptionPane.showMessageDialog (WebBrowser.this,"请输入链接地址","网页浏览器",JOptionPane.ERROR_MESSAGE);
            }
        }

        //另存为...
        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,"请输入链接地址","网页浏览器",JOptionPane.ERROR_MESSAGE);
            }
        }
        //退出
        else if (e.getSource() == exitItem ||e.getSource() == picExit){
            this.setVisible(false);
        }
        //后退
        else if (e.getSource() == backItem ||e.getSource() == picBack){
            historyIndex--;
            if(historyIndex < 0)
                historyIndex = 0;
            url = jurl.getText();
            try{
                //获得history对象中本地址之前访问的地址
                url = (String)history.get(historyIndex);
                jEditorPane1.setPage(url);
                jurl.setText(url.toString());
		jEditorPane1.setEditable(false); //add by copy editor :)
                jEditorPane1.revalidate ();
            }
            catch(Exception ex){
            }
        }
        //前进
        else if (e.getSource() == forwardItem ||e.getSource() == picForward){
            historyIndex++;
            if(historyIndex >= history.size())
                    historyIndex = history.size()-1;
            url = jurl.getText();
            try{
                //获得history对象中本地址之后访问的地址
                url = (String)history.get(historyIndex);
                jEditorPane1.setPage(url);
                jurl.setText(url.toString());
		jEditorPane1.setEditable(false); //add by copy editor :)
                jEditorPane1.revalidate ();
            }
            catch(Exception ex){
            }
        }
        //添加收藏
       else if (e.getSource() == collectionItem ||e.getSource() == picCollection){
         if (jurl.getText().trim().equals("")) {
           JOptionPane.showMessageDialog(WebBrowser.this, "请输入链接地址", "网页浏览器",
                                         JOptionPane.ERROR_MESSAGE);
         }
         else {
           collEctionItem[i] = jurl.getText();
           JMenuItem collectionItem =new JMenuItem ( collEctionItem[i]);
           collEction.add(collectionItem);
           i++;
         }



       }
       //新建
       else if(e.getSource()==newfileItem){
         try{
           UIManager.setLookAndFeel(
               UIManager.getCrossPlatformLookAndFeelClassName()
           );
       }
       catch(Exception ee){
       }

       WebBrowser webBrowser1 = new WebBrowser ();
       webBrowser1.pack();
       webBrowser1.setVisible(true);

        }



        //全屏
        else if (e.getSource() == fullscreenItem){
            boolean add_button2=true;
            //获得屏幕大小
            Dimension size = Toolkit.getDefaultToolkit().getScreenSize();

            Container content = window.getContentPane();
            content.add (panel1,"North");
            content.add (scrollPane,"Center");

            //button2为点击“全屏”后的还原按钮
            if(add_button2==true) {
                panel1.add (button2);
            }
            //为button2添加事件
            button2.addActionListener (new ActionListener () {
                public void actionPerformed (ActionEvent evt) {
                    WebBrowser.this.setEnabled (true);
                    window.remove (panel1);
                    window.remove (toolBar);
                    window.remove (scrollPane);
                    window.setVisible (false);

                    scrollPane.setPreferredSize (new Dimension (100,500));
                    getContentPane ().add (scrollPane,BorderLayout.CENTER);
                    getContentPane ().add (panel2,BorderLayout.NORTH);
                    panel2.add(panel1);
                    //getContentPane ().add (toolBar,BorderLayout.NORTH);
                    panel1.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 ("")) {
                    //根据url，获得源代码
                    getHtmlSource (url);
                    //生成显示源代码的框架对象
                    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);
                }
        }
        //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 ("另存为...");
        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 + " 已经被保存至"+ linesep +fileName.getAbsolutePath ();
                    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 ();
    }

    /*
    **获得源代码
    */
    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);
        }
    }

    /**
    **实现监听器接口的hyperlinkUpdate函数
    */
    public void hyperlinkUpdate (HyperlinkEvent e) {

	try {
 		if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED)
 			jEditorPane1.setPage(e.getURL());
 		} catch (Exception ex) {
 			ex.printStackTrace(System.err);
 		}
   }

    /*生成一个IE对象*/
    public static void main (String [] args){
        try{
            UIManager.setLookAndFeel(
                UIManager.getCrossPlatformLookAndFeelClassName()
            );
        }
        catch(Exception e){
        }

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