java - 在选项卡式窗口中显示输出

Question

我用 Java 为 Linux 开发了一个任务管理器。现在的输出显示在控制台中，而一个选项卡式窗口单独显示(这是使用 Java Swing 完成的)。现在我希望控制台的输出显示在选项卡式窗口中。

我该怎么做？

有些类(class)我用过。一个用于任务管理器功能，另一个用于 GUI。我已粘贴在编码下方。

**TabbedPaneDemo1.java**

package components;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.Writer;
import java.util.Iterator;
import java.util.List;


/*
 * TabbedPaneDemo.java requires one additional file:
 *   images/middle.gif.
 */

import javax.swing.JTabbedPane;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JComponent;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.JTextField;
import javax.swing.JTextArea;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.TextArea;
import java.awt.event.KeyEvent;
import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;

public class TabbedPaneDemo1
{

public static void main(String args[]) throws Exception
{
    try
    {   
        TextArea textarea = new TextArea();
        TabbedPaneDemo obj = new TabbedPaneDemo();
        obj.fn();
        String line;
        String result = "";
        FileOutputStream out;
        //FileOutputStream out; // declare a file output object
        PrintStream p;
        Process p1 = Runtime.getRuntime().exec("tasklist.exe");
        out = new FileOutputStream("myfile.txt");//write to a file//
        p = new PrintStream( out );
        BufferedReader input = new BufferedReader(new InputStreamReader(p1.getInputStream()));//read form a file//
        while ((line = input.readLine()) != null)
        {
            System.out.println(line);
            //textarea.append(line + "\n");
            result += line+"\n";
            p.println (line);
            //textarea.setVisible(true);    
        }
        //msgBox(result);
        p.close();
        input.close();   
    }
    catch(Exception e)
    {

    }
}
    public static void msgBox(String msg) {
    javax.swing.JOptionPane.showConfirmDialog((java.awt.Component)
    null, msg, "WindowsUtils",
    javax.swing.JOptionPane.DEFAULT_OPTION);
    }
}

**TabbedPaneDemo.java**

package components;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.KeyEvent;

import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

import javax.swing.JTabbedPane;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JComponent;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.JTextField;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.KeyEvent;

public class TabbedPaneDemo extends JPanel {
Integer i;
public TabbedPaneDemo() {
    super(new GridLayout(1, 1));

    JTabbedPane tabbedPane = new JTabbedPane();
    ImageIcon icon = createImageIcon("images");


    JComponent panel1 = makeTextPanel("tasklist");
    tabbedPane.addTab("tasks", icon, panel1,
            "ta");
    tabbedPane.setMnemonicAt(0, KeyEvent.VK_1);

    JComponent panel2 = makeTextPanel("windows");
    tabbedPane.addTab("wins", icon, panel2,
            "wi");
    tabbedPane.setMnemonicAt(1, KeyEvent.VK_2);


    add(tabbedPane);`enter code here`
        tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);    
    }
    protected JComponent makeTextPanel(String text)
    {
        JPanel panel = new JPanel(false);
        JLabel filler = new JLabel(text);
        filler.setHorizontalAlignment(JLabel.CENTER);
        panel.setLayout(new GridLayout(1, 1));
        panel.add(filler);
        return panel;
    }
    protected static ImageIcon createImageIcon(String path) {
        java.net.URL imgURL = TabbedPaneDemo.class.getResource(path);
        if (imgURL != null) {
            return new ImageIcon(imgURL);
        } else {
            System.err.println("Couldn't find file: " + path);
            return null;
        }
    }
    private static void createAndShowGUI() {
        JFrame frame = new JFrame("TabbedPaneDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new TabbedPaneDemo(), BorderLayout.CENTER);
        frame.pack();
        frame.setVisible(true);
    }
    public static void fn() {
        SwingUtilities.invokeLater(new Runnable() {
            public void run()
            {
        UIManager.put("swing.boldMetal", Boolean.FALSE);
        createAndShowGUI();
            }
        });
    }
}

Answer 1

这是一个非常幼稚的实现。

package test.t100.t001;

import java.awt.*;
import java.awt.event.KeyEvent;
import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;

import javax.swing.*;

public class TabbedPaneDemo extends JPanel {

    private static final long serialVersionUID = 1L;
    Integer i;

    JTextArea output = new JTextArea();

    public static void main(String args[]) 
    {
        SwingUtilities.invokeLater(new Runnable() {
            public void run()
            {
                JFrame frame = new JFrame("TabbedPaneDemo");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TabbedPaneDemo(), BorderLayout.CENTER);
                frame.pack();
                frame.setVisible(true);
            }
        });
    }

    private String getDetails() throws IOException {
        //fn();
        String line;
        String result = "";
        PrintStream p;
        Process p1 = Runtime.getRuntime().exec("tasklist.exe");
        // read from a process
        BufferedReader input = new BufferedReader(
                new InputStreamReader(p1.getInputStream()));
        while ((line = input.readLine()) != null)
        {
            //System.out.println(line);
            output.append(line + "\n");
            result += line+"\n";
            //p.println (line);
            //textarea.setVisible(true);    
        }
        //msgBox(result);
        //p.close();
        input.close();   

        return result;
    }

    public TabbedPaneDemo() {
        super(new GridLayout(1, 1));

        JTabbedPane tabbedPane = new JTabbedPane();
        ImageIcon icon = createImageIcon("images");


        JComponent panel1 = makeTextPanel("tasklist");
        tabbedPane.addTab("tasks", icon, panel1,
                "ta");
        // add it to something!
        panel1.add(new JScrollPane(output));
        tabbedPane.setMnemonicAt(0, KeyEvent.VK_1);

        JComponent panel2 = makeTextPanel("windows");
        tabbedPane.addTab("wins", icon, panel2,
                "wi");
        tabbedPane.setMnemonicAt(1, KeyEvent.VK_2);


        add(tabbedPane);//`enter code here`
        tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);

        try {
            String s = getDetails();
            output.setText(s);
        } catch(IOException e) {
            e.printStackTrace();
        }
    }


    public static void msgBox(String msg) {
        javax.swing.JOptionPane.showConfirmDialog((java.awt.Component)
                null, msg, "WindowsUtils",
                javax.swing.JOptionPane.DEFAULT_OPTION);
    }


    protected JComponent makeTextPanel(String text)
    {
        JPanel panel = new JPanel(false);
        JLabel filler = new JLabel(text);
        filler.setHorizontalAlignment(JLabel.CENTER);
        panel.setLayout(new GridLayout(1, 1));
        panel.add(filler);
        return panel;
    }

    protected static ImageIcon createImageIcon(String path) {
        java.net.URL imgURL = TabbedPaneDemo.class.getResource(path);
        if (imgURL != null) {
            return new ImageIcon(imgURL);
        } else {
            System.err.println("Couldn't find file: " + path);
            return null;
        }
    }
}

其他说明:

1. 为了尽快获得更好的帮助，请发布 SSCCE .尤其不要包含不必要的图片。
2. 对此类数据使用JTable。
3. 代码将文本区域转储到显然具有 GridLayout - BNI
的选项卡式 Pane 中
4. 不要在没有充分理由的情况下混用 Swing 和 AWT 组件。
5. 如前所述，使用 SwingWorker 获取数据。

更新

..but the output from the console doesn't appear.

嗯嗯。让我们想想

I have developed a task manager for Linux in Java

..结合..

Process p1 = Runtime.getRuntime().exec("tasklist.exe");

现在，如果我误解了什么，请纠正我，但是 AFIAU Linux 没有 EXE。

我猜代码在 Linux 上失败了，因为进程的 err 流被忽略了，所以没有人告诉您原因。这是上面显示的代码的屏幕截图，它出现在 Windows 7 上。

现在，如果数据是硬编码的，您可能会看到类似上面的内容。这回答了“(如何)在选项卡式窗口中显示输出”的问题，对吗？

更多信息。通过实现 When Runtime.exec() won't 的所有建议，可以解决您所看到的新问题。 .如果您实现了所有建议但仍然无法解决问题，我建议您提出一个新问题。