如何在jTextArea(或其他类型的控制台)中保留命令提示符的格式？

当我在Java程序中输出流时,我无法弄清楚如何保留命令提示符的格式.有人有什么建议吗？

解决方法:

根据您的数据来源,您可以使用多种可能的解决方案……

最基本的是确保您使用固定宽度的字体…

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

public class OutputTest {

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

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

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            String[] lines = {
                "Idx     Met        MTU        State                Name           ",
                "---  ---------  ----------  ------------  --------------------------",
                "  1         50  4294967295  connected     Loopback Psudo-Interface 1",
                " 11         10        1500  connected     Local Area Connection     ",
                " 11          5        1500  disconnected  Local Area Connection 3   ",
            };

            setLayout(new BorderLayout());
            JTextArea ta = new JTextArea(10, 40);
            ta.setFont(new Font("Monospaced", Font.PLAIN, 13));
            for (String text : lines) {
                ta.append(text + "\n");
            }
            add(new JScrollPane(ta));
        }

    }

}

如果您的管道内容来自其他来源(如外部命令),这非常有用.

如果您可以控制内容,则可以使用String.format,但是,除非您使用的是固定宽度字体,否则它将没有任何区别,您仍然会遇到格式问题.

另一个解决方案是在JEditorPane中使用html表,然后字体无关紧要

另一种解决方案可能是使用JTable,它被设计为以表格形式呈现数据.有关详细信息,请参见How to Use Tables

更新

It’s a bug with the auto generated code in Netbeans 8.0 I’m pretty sure. It just made it tough to track down the issue.

我非常怀疑这是一个错误,因为每天都有成百上千的人使用它……但是如果没有runnable example证明你的问题,那么肯定不可能知道……

ta.setFont(new Font(“Monospaced”, Font.PLAIN, 13)); BUT if you switch to bold or italics or bold italics then the line is generated and works correctly.

我不敢苟同…

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestTable {

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

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

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            setLayout(new GridLayout(4, -1));
            String[] lines = {
                "Idx     Met        MTU        State                Name           ",
                "---  ---------  ----------  ------------  --------------------------",
                "  1         50  4294967295  connected     Loopback Psudo-Interface 1",
                " 11         10        1500  connected     Local Area Connection     ",
                " 11          5        1500  disconnected  Local Area Connection 3   ",};

            Font baseFont = new Font("Monospaced", Font.PLAIN, 13);
            addTextArea(baseFont, lines);
            addTextArea(baseFont.deriveFont(Font.ITALIC), lines);
            addTextArea(baseFont.deriveFont(Font.BOLD), lines);
            addTextArea(baseFont.deriveFont(Font.BOLD | Font.ITALIC), lines);
        }

        protected void addTextArea(Font font, String... lines) {

            JTextArea ta = new JTextArea(20, 40);
            ta.setFont(font);
            for (String text : lines) {
                ta.append(text + "\n");
            }
            ta.setCaretPosition(0);
            add(new JScrollPane(ta));
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(200, 200);
        }

    }
}

标签：java,format,command-prompt,swing
来源： https://codeday.me/bug/20190929/1833031.html