如何通过Java Applet在浏览器中显示信息？

Question

I want to display information about the musical composition in the browser via Java applet. I use the library beaglebuddy_mp3.jar for id3 tags. A folder with files looks like this:

applet
 - index.html
 - FirstApplet.class
 - beaglebuddy_mp3.jar

In index.html I connect an applet:

<applet code="FirstApplet.class" archive="beaglebuddy_mp3.jar" width="500" height="500"></applet>

FirstApplet.class contains the following code:

import java.applet.Applet;
import java.awt.Graphics;
import java.io.File;
import java.io.IOException;

import com.beaglebuddy.mp3.MP3;

public class FirstApplet extends Applet{

public void paint(Graphics g){
    try {
        MP3 mp3 = new MP3("D:\\Music\\abc.mp3");
        g.drawString(mp3.getBand() +" "+mp3.getTitle(), 20, 20);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();

    }
   } 
}

After starting the index.html file dialog box appears with a warning stating that I run the application at your own risk. Then I click "Run", instantly appears and disappears gray square. On that nothing is displayed.

Answer 1

Try the following:

import javax.swing.JApplet;
import javax.swing.SwingUtilities;
import javax.swing.JLabel;
import java.io.File;
import java.io.IOException;
import com.beaglebuddy.mp3.MP3;


public class FirstApplet extends JApplet {

    public void init() {

        try {
            SwingUtilities.invokeAndWait(new Runnable() {
                public void run() {

                    MP3 mp3 = new MP3("D:\\Music\\abc.mp3");
                    JLabel label = new JLabel(mp3.getBand() +" "+mp3.getTitle());
                    add(label);
                }
            });
        } catch (Exception e) {
            System.err.println("createGUI didn't complete successfully");
        }
    }
}

And secondly you have to sign your applet code with an official certificate to be able to run it in your web browser.