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javahtmlimageswingjeditorpane

JEditorPane does not set any HTML

I have searched and haven't seen anyone experiencing what I am.. yet, but this is the issue I am having:

I am trying to set a small bit of HTML as the text of my JEditorPane. Here is the code: 

JEditorPane htmlPane = new JEditorPane();
String imageString = "<img   src=\"http://tfwiki.net/mediawiki/images2/thumb/3/37/Optimusg1.jpg/350px-Optimusg1.jpg\"/>";
String description = "<table width=300 border=0 cellspacing=0></table>" + imageString + "</table>";
htmlPane.setContentType("text/html");
htmlPane.setText(description);

but after I call setText, my editor pane contents are:

<html>
  <head>

  </head>
  <body>
  </body>
</html>

I have tried variations of adding <html> and </html> to the beginning and end of my string, but no luck. Anyone know what I am missing or doing wrong?

I am using Java 1.7.0_55 32-bit.

Solution

  • After a little testing I found that...

    • The HTML has to be well formed before the JEditorPane will accept it, and in fact, it seems to do some of it's own validation, removing invalid tags...fun stuff
    • I had to include the table row and cell <tr><td>...</td></tr> into the table
    • Some sites may actively block the downloading of images if the HTTP headers do not have the appropriate headers, this meant that the image you had in your example repeatedly failed to download in the JEditorPane, even though the same HTML would load the image in a browser (like Chrome)
    • It's sometimes helpful to add additional content into the HTML to make sure it's rendering what you think, for example, I simply added some text, set the table border to 1 and add an alt tag to the image, which helped verify certain elements where actually been rendered...

    Editor

    import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestEditorPane {

    public static void main(String[] args) {
        new TestEditorPane();
    }

    public TestEditorPane() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JEditorPane htmlPane = new JEditorPane();
                String description = "<html><body>Hello<table border=1><tr><td><img alt='Bad' src='http://fc07.deviantart.net/fs70/i/2012/084/c/0/angry_wet_ponies_are_angry____by_tabby444-d4tyfsc.png'/></tr></td></table></body></html>";
                htmlPane.setContentType("text/html");
                htmlPane.setText(description);
                System.out.println(htmlPane.getText());

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new JScrollPane(htmlPane));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

}