webviewer.java

纯java实现的一个简单网页浏览器

package webviewer;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.net.URL;
import java.io.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class WebViewer
    extends JFrame {
  JPanel contentPane;
  BorderLayout borderLayout1 = new BorderLayout();
  JTextField jTextField1 = new JTextField();
  JScrollPane jScrollPane1 = new JScrollPane();
  JEditorPane jEditorPane1 = new JEditorPane();

  //Construct the frame
  public WebViewer() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  //Component initialization
  private void jbInit() throws Exception {
    contentPane = (JPanel)this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(349, 272));
    this.setTitle("网页浏览器");
    jTextField1.setText("");
    jTextField1.addKeyListener(new WebViewer_jTextField1_keyAdapter(this));
    jEditorPane1.addHyperlinkListener(new
                                      WebViewer_jEditorPane1_hyperlinkAdapter(this));
    contentPane.add(jTextField1, BorderLayout.NORTH);
    contentPane.add(jScrollPane1, BorderLayout.CENTER);
    jScrollPane1.getViewport().add(jEditorPane1, null);
  }

  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  void jEditorPane1_hyperlinkUpdate(HyperlinkEvent e) {
    if (e.getEventType() ==
        javax.swing.event.HyperlinkEvent.EventType.ACTIVATED) {
      try {
        URL url = e.getURL(); //获得地址
        jEditorPane1.setPage(url); //重新连接
        jTextField1.setText(url.toString());
      }
      catch (IOException io) {
        jTextField1.setText("错误：无法打开！");
      }
    }
  }

  void jTextField1_keyPressed(KeyEvent e) {
    if (e.getKeyChar() == KeyEvent.VK_ENTER) {
      String str = jTextField1.getText();
      String substr = str.substring(0, 7); //获取字串
      String http = "http://";
      if (!substr.equals(http)) { //如果字串不等于“"http://"则将"http://"字符串加入到str开头
        str = http + str;
      }
      try {
        jEditorPane1.setPage(str); //显示网页内容
      }
      catch (IOException err) {
        jEditorPane1.setText("错误" + err);
      }
    }
  }
}

class WebViewer_jEditorPane1_hyperlinkAdapter
    implements javax.swing.event.HyperlinkListener {
  WebViewer adaptee;

  WebViewer_jEditorPane1_hyperlinkAdapter(WebViewer adaptee) {
    this.adaptee = adaptee;
  }

  public void hyperlinkUpdate(HyperlinkEvent e) {
    adaptee.jEditorPane1_hyperlinkUpdate(e);
  }
}

class WebViewer_jTextField1_keyAdapter
    extends java.awt.event.KeyAdapter {
  WebViewer adaptee;

  WebViewer_jTextField1_keyAdapter(WebViewer adaptee) {
    this.adaptee = adaptee;
  }

  public void keyPressed(KeyEvent e) {
    adaptee.jTextField1_keyPressed(e);
  }
}