如何在 JFrame/JPanel 中可视化控制台 java
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how to visualize console java in JFrame/JPanel
提问by Gianfra
I made a Java program using Swing libraries. Now I would like to redirect my console outputs into a JFrame or JPanel.
我使用 Swing 库制作了一个 Java 程序。现在我想将控制台输出重定向到 JFrame 或 JPanel。
回答by Jonathan Payne
Once you have your JFrameor JPanel, add a text field to it.
拥有JFrame或 后JPanel，向其添加文本字段。
JTextAreais a good choice, because it's multiple lines.
Once it is added, you can .append('text');to it instead of writing the System.out.print();
JTextArea是一个不错的选择，因为它是多行的。添加后，您可以添加.append('text');它而不是编写System.out.print();
JFrame jFrame = new JFrame();
JTextArea jTextArea = new JTextArea();
jTextArea.append( "Hello World." );
jFrame.add( jTextArea );
回答by Hovercraft Full Of Eels
You need to make an OutputStream that re-directs output to the text area and that implements all the necessary methods of the OutputStream interface, and then in your main program, redirect your Standard output into this stream. I've used something like this for one of my programs:
您需要创建一个将输出重定向到文本区域并实现 OutputStream 接口的所有必要方法的 OutputStream，然后在您的主程序中，将您的标准输出重定向到此流。我在我的一个程序中使用了这样的东西：
import java.io.IOException;
import java.io.OutputStream;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class TextAreaOutputStream extends OutputStream {
private final JTextArea textArea;
private final StringBuilder sb = new StringBuilder();
private String title;
public TextAreaOutputStream(final JTextArea textArea, String title) {
this.textArea = textArea;
this.title = title;
sb.append(title + "> ");
}
@Override
public void flush() {
}
@Override
public void close() {
}
@Override
public void write(int b) throws IOException {
if (b == '\r')
return;
if (b == '\n') {
final String text = sb.toString() + "\n";
SwingUtilities.invokeLater(new Runnable() {
public void run() {
textArea.append(text);
}
});
sb.setLength(0);
sb.append(title + "> ");
return;
}
sb.append((char) b);
}
}
And you can demonstrate it with this:
你可以用这个来证明它：
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.PrintStream;
import javax.swing.*;
@SuppressWarnings("serial")
public class TextAreaOutputStreamTest extends JPanel {
private JTextArea textArea = new JTextArea(15, 30);
private TextAreaOutputStream taOutputStream = new TextAreaOutputStream(
textArea, "Test");
public TextAreaOutputStreamTest() {
setLayout(new BorderLayout());
add(new JScrollPane(textArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER));
System.setOut(new PrintStream(taOutputStream));
int timerDelay = 1000;
new Timer(timerDelay , new ActionListener() {
int count = 0;
@Override
public void actionPerformed(ActionEvent arg0) {
// though this outputs via System.out.println, it actually displays
// in the JTextArea:
System.out.println("Count is now: " + count + " seconds");
count++;
}
}).start();
}
private static void createAndShowGui() {
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new TextAreaOutputStreamTest());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
