showdocument.java

把远程网页转成为自己想要的格式保存下来

/* 
 * 1.1 version.
 */

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.URL;
import java.net.MalformedURLException;

public class ShowDocument extends Applet implements ActionListener
{
    AppletContext appletContext;

    TextField urlField;
    Choice choice;
	Button button;

    public void init()
	{
		setLayout( new GridLayout(3,1) );

		appletContext = getAppletContext();

		Panel p1, p2, p3;

		p1 = new Panel();

        Label label1 = new Label("URL of document to show:", Label.RIGHT);
        p1.add(label1);

        urlField = new TextField("http://www.besti.edu.cn/", 40);
        urlField.addActionListener(this);
		p1.add(urlField);

		add(p1);

		p2 = new Panel();

        Label label2 = new Label("Window/frame to show it in:", Label.RIGHT);
        p2.add(label2);

        choice = new Choice();
        choice.addItem("(browser's choice)"); //don't specify
        choice.addItem("My Personal Window"); //a window named "My Personal Window"
        choice.addItem("_blank"); //a new, unnamed window
        choice.addItem("_self"); 
        choice.addItem("_parent"); 
        choice.addItem("_top"); //the Frame that contained this applet
        p2.add(choice);
		add(p2);

		p3 = new Panel();

        button = new Button("Show document");
        button.addActionListener(this);
		p3.add(button);
        add(p3);
    }

    public void actionPerformed(ActionEvent event)
	{
        String urlString = urlField.getText();
        URL url = null;
        
		try
		{
            url = new URL(urlString);
        }catch (MalformedURLException e)
		{
            System.err.println("Malformed URL: " + urlString);
        }

        if (url != null)
		{
            if (choice.getSelectedIndex() == 0)
			{
                appletContext.showDocument(url);
            }else
			{
                appletContext.showDocument(url, choice.getSelectedItem());
            }
        }
    }
}