JOptionPane output text copy

问题:

I have no experience with JOptionpane but I need a simple program to simplify my life. The code I need help with is below:

public static void main (String[] args) {
    String input = "";

    input = JOptionPane.showInputDialog("Enter code");

    JOptionPane.showMessageDialog(null, toStringU(toArray(input)), "RESULT",
            JOptionPane.INFORMATION_MESSAGE);

}

toStringU method gives me a long long text

I want to run it without any compiler (a standalone application, double click, put info and take results).

And I cant copy the result from output panel, which I need to copy. So either I need to copy it and/or I want to write it to a txt file (second one would be great).

回答1:

JOptionPane allows you to specify an Object as the message parameter, if this value is a Component of some kind, it will be added to the JOptionPane (Strings are rendered using JLabel automatically)

By setting up something like a JTextArea that is not editable, you can take advantage of its copying capabilities, with out much more work on your part...

import java.awt.EventQueue;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestOptionPane11 {

    public static void main(String[] args) {
        new TestOptionPane11();
    }

    public TestOptionPane11() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JTextArea ta = new JTextArea(10, 10);
                ta.setText("This is some really long text that is likely to run over "
                        + "the viewable area and require some additional space to render "
                        + "properly, but you should be able to select and copy parts or "
                        + "whole sections of the text as you, but it should remain "
                        + "no editable...");
                ta.setWrapStyleWord(true);
                ta.setLineWrap(true);
                ta.setCaretPosition(0);
                ta.setEditable(false);

                JOptionPane.showMessageDialog(null, new JScrollPane(ta), "RESULT", JOptionPane.INFORMATION_MESSAGE);

            }
        });
    }
}

Additional side effects

Another side effect is the fact that the JTextArea can actually write it's contents to a Writer for you...

FileWriter writer = null;
try {
    writer = new FileWriter("SomeoutputFile.txt", false);
    ta.write(writer);
} catch (IOException exp) {
    exp.printStackTrace();
} finally {
    try {
        writer.close();
    } catch (Exception e) {
    }
}

Which allows you to write a file as well...