FileTableHTML.java Source code

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Here is the source code for FileTableHTML.java

Source

/*
 * This example is from the book "Java Foundation Classes in a Nutshell".
 * Written by David Flanagan. Copyright (c) 1999 by O'Reilly & Associates.  
 * You may distribute this source code for non-commercial purposes only.
 * You may study, modify, and use this example for any purpose, as long as
 * this notice is retained.  Note that this example is provided "as is",
 * WITHOUT WARRANTY of any kind either expressed or implied.
 */

import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import java.util.Date;

/**
 * This class implements a simple directory browser using the HTML
 * display capabilities of the JEditorPane component.
 **/
public class FileTableHTML {
    public static void main(String[] args) throws IOException {
        // Get the name of the directory to display
        String dirname = (args.length > 0) ? args[0] : System.getProperty("user.home");

        // Create something to display it in.
        final JEditorPane editor = new JEditorPane();
        editor.setEditable(false); // we're browsing not editing
        editor.setContentType("text/html"); // must specify HTML text
        editor.setText(makeHTMLTable(dirname)); // specify the text to display

        // Set up the JEditorPane to handle clicks on hyperlinks
        editor.addHyperlinkListener(new HyperlinkListener() {
            public void hyperlinkUpdate(HyperlinkEvent e) {
                // Handle clicks; ignore mouseovers and other link-related events
                if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
                    // Get the HREF of the link and display it.
                    editor.setText(makeHTMLTable(e.getDescription()));
                }
            }
        });

        // Put the JEditorPane in a scrolling window and display it.
        JFrame frame = new JFrame("FileTableHTML");
        frame.getContentPane().add(new JScrollPane(editor));
        frame.setSize(650, 500);
        frame.setVisible(true);
    }

    // This method returns an HTML table representing the specified directory
    public static String makeHTMLTable(String dirname) {
        // Look up the contents of the directory
        File dir = new File(dirname);
        String[] entries = dir.list();

        // Set up an output stream we can print the table to.
        // This is easier than concatenating strings all the time.
        StringWriter sout = new StringWriter();
        PrintWriter out = new PrintWriter(sout);

        // Print the directory name as the page title
        out.println("<H1>" + dirname + "</H1>");

        // Print an "up" link, unless we're already at the root
        String parent = dir.getParent();
        if ((parent != null) && (parent.length() > 0))
            out.println("<A HREF=\"" + parent + "\">Up to parent directory</A><P>");

        // Print out the table
        out.print("<TABLE BORDER=2 WIDTH=600><TR>");
        out.print("<TH>Name</TH><TH>Size</TH><TH>Modified</TH>");
        out.println("<TH>Readable?</TH><TH>Writable?</TH></TR>");
        for (int i = 0; i < entries.length; i++) {
            File f = new File(dir, entries[i]);
            out.println("<TR><TD>" + (f.isDirectory() ? "<a href=\"" + f + "\">" + entries[i] + "</a>" : entries[i])
                    + "</TD><TD>" + f.length() + "</TD><TD>" + new Date(f.lastModified()) + "</TD><TD align=center>"
                    + (f.canRead() ? "x" : " ") + "</TD><TD align=center>" + (f.canWrite() ? "x" : " ")
                    + "</TD></TR>");
        }
        out.println("</TABLE>");
        out.close();

        // Get the string of HTML from the StringWriter and return it.
        return sout.toString();
    }
}