WebBrowser.java: Display HTML file in JEditorPane

电玩女神 2022-07-21 12:28 169阅读 0赞

(转载)

该程序让客户在文本域输入一个HTML文件的URL,按回车键之后,在编辑窗格内显示该HTML文件．

程序代码如下：// WebBrowser.java: Display HTML file in JEditorPane  
import java.awt.\*;  
import java.awt.event.\*;  
import java.applet.\*;  
import javax.swing.\*;  
import java.net.URL;  
import javax.swing.event.\*;  
import java.io.\*; public class  **WebBrowser** extends JApplet  
implements ActionListener,HyperlinkListener\{  
// JEditor pane to view HTML files  
private JEditorPane jep=new JEditorPane();  
// Label for URL  
private JLabel jlblURL=new JLabel("URL");  
// Text field for entering URL  
private JTextField jtfURL=new JTextField();  
  
// Initialize the applet  
public void init()\{  
    // Create a panel jpURL to hold the label and text field  
    JPanel jpURL=new JPanel();  
    jpURL.setLayout(new BorderLayout());  
    jpURL.add(jlblURL,BorderLayout.WEST);  
    jpURL.add(jtfURL,BorderLayout.CENTER);  
      
    // Create a scroll pane to hold JEditorPane  
    JScrollPane jspViewer=new JScrollPane();  
    jspViewer.getViewport().add(jep,null);  
      
    // Place jpURL and jspViewer in the applet  
    this.getContentPane().add(jspViewer,BorderLayout.CENTER);  
    this.getContentPane().add(jpURL,BorderLayout.NORTH);   // Set jep noneditable  
    jep.setEditable(false);  
      
    // Register listener  
    jep.addHyperlinkListener(this);  
    jtfURL.addActionListener(this);  
\} public void actionPerformed(ActionEvent e)\{  
    // TODO: Implement this java.awt.event.ActionListener method  
    try\{  
      // Get the URL from text field  
      URL url=new URL(jtfURL.getText().trim());  
      // Display the HTML file  
      jep.setPage(url);  
    \}catch(IOException ex)\{  
      System.out.println(ex);  
    \}  
\} public void hyperlinkUpdate(HyperlinkEvent e)\{  
   // TODO: Implement HyperlinkListener method  
   try\{  
      // Get the URL from text field  
      jep.setPage(e.getURL());  
    \}catch(IOException ex)\{  
      System.out.println(ex);  
    \}  
\}  
  
// Main method  
public static void  **main**(String\[\] args)\{  
    // Create a frame  
    JFrame frame=new JFrame("Web Browser");  
    // Create an instance of the applet  
    WebBrowser applet=new WebBrowser();  
    // Add the applet instance to the frame  
    frame.getContentPane().add(applet,BorderLayout.CENTER);  
    // Invoke init() and start()  
    applet.init();  
    applet.start();  
    // Display the frame  
    frame.setSize(600,600);  
    // frame.setDefaultCloseOperation(JFrame.EXIT\_ON\_CLOSE);  
    frame.setVisible(true);  
\}  
\}不足：该程序不能浏览本地的HTML文件．只能浏览远程的HTML文件,且必须输入以http://开头的URL.

收藏于 2009-07-26