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问题:

I cant believe fastest solution for a multilined JLabel is the following one (text comes from a var, and so I dont want to put HTML code manually every x chars, its so ugly):

public class JMultilineLabel extends JTextArea{
    private static final long serialVersionUID = 1L;
    public JMultilineLabel(String text){
        super(text);
        setEditable(false);  
        setCursor(null);  
        setOpaque(false);  
        setFocusable(false);  
        setFont(UIManager.getFont("Label.font"));      
        setWrapStyleWord(true);  
        setLineWrap(true);
    }
}

... sure it isnt a better way to handle this????

回答1:

If you want a multilne label then you simply use HTML in its text, as they support its use. Therefore, use line brake tag </br> to break lines or put separate lines in <p></p> paragraph tags.

Do not forget to mark that you want to use HTML for a JLabel by starting its text with the <html> tag.

More available here.

BTW I forgot to check if there were other related questions about JLabel use and there were at least a few, check this or this. :)

EDIT:

For a working sample, showing a different approach, without setting a style and with use of paragraph and label taking available space, please see below:

import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.*;

public class LabelHTMLAutoResize {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame f = new JFrame();
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                JPanel p = new JPanel(new BorderLayout());
                JLabel l = new JLabel("<html><p> Some verrrry long text  Some verrrry long  Some verrrry long text dsa ads oiosi o</p>");
                l.setVerticalAlignment(SwingConstants.TOP);
                l.setOpaque(true);
                l.setBackground(Color.green);
                p.add(l);
                f.setContentPane(p);
                /* good practice is to use f.pack(); and let the size be automatically calculated but we want to show line wrapping thus frame size is set */
                f.setSize(200, 200);
                f.setVisible(true);
            }
        });
    }
}

回答2:

I need to make linewrapping automatically, and not having to parse the incoming string and put a <BR> every x chars

Set the body width (of the HTML). Swing HTML support includes basic styles.

I had some examples of using CSS to limit the width of a JLabel lying around SO somewhere..

Aah yes, there it is:

import javax.swing.*;

class FixedWidthLabel {

    public static void main(String[] srgs) {
        String s = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean eu nulla urna. Donec sit amet risus nisl, a porta enim. Quisque luctus, ligula eu scelerisque gravida, tellus quam vestibulum urna, ut aliquet sapien purus sed erat. Pellentesque consequat vehicula magna, eu aliquam magna interdum porttitor. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Sed sollicitudin sapien non leo tempus lobortis. Morbi semper auctor ipsum, a semper quam elementum a. Aliquam eget sem metus.";
        String html1 = "<html><body style='width: ";
        String html2 = "px'>";

        JOptionPane.showMessageDialog(null, new JLabel(html1+"200"+html2+s));
        JOptionPane.showMessageDialog(null, new JLabel(html1+"300"+html2+s));
    }
}