如何在jTextArea（或其他类型的控制台）内保留命令提示符的格式？ [英] How to preserve command prompt's formatting inside a jTextArea (or some other type of console)?
问题描述
有几种可能的解决方案可供您使用，具体取决于您的数据如何派生...
最基本的是确保您使用的是固定宽度的字体...
$ p $ 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（）;
$ b 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 {
$ b $ public TestPane（）{
String [] lines = {
Idx Met MTU州名，
--- --------- ---------- ------------ ------- -------------------，
1 50 4294967295已连接Loopback Psudo-Interface 1，
11 10 1500已连接本地连接 ，
11 5 1500断开本地连接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 +\\\
）;
}
add（new JScrollPane（ta））;
code
$ b <如果你的管道内容来自其他来源（如外部命令），这是非常好的。
如果你有内容的控制权，你可以使用 String.format ，但是，除非您使用的是固定宽度的字体，否则不会有任何区别，您仍然有格式问题。
另一个解决方案是在 JEditorPane 中使用html表格，那么字体无关紧要
另一个解决方案可能是使用一个 JTable ，它被设计成以表格形式呈现数据。有关详细信息，请参阅如何使用表格
$ b $ p 更新
$ b
这是自动生成的代码Netbeans 8.0我很确定。这个问题很难找到。
我很怀疑这是一个错误，因为这已经被数百如果不是每天有成千上万的人......但没有一个可运行的例子，这证明了你的问题是不可能的
ta.setFont（new Font（Monospaced，Font.PLAIN，13））;但是，如果你切换到粗体或斜体或粗体斜体，那么行生成，并正常工作。
我不同意...
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（）;
$ b $ 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 {
$ b $ public TestPane（）{$ b $ setLayout（new GridLayout（4，-1））;
String [] lines = {
Idx Met MTU State Name，
--- --------- ---------- - ----------- --------------------------，
1 50 4294967295连接Loopback Psudo - 接口1，
11 10 1500连接本地连接，
11 5 1500断开本地连接3，};
字体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 +\\\
）;
}
ta.setCaretPosition（0）;
add（new JScrollPane（ta））;
}
@Override
public Dimension getPreferredSize（）{
return new Dimension（200，200）;
}
}
}
I cannot figure out how to preserve command prompt's formatting when I output the stream inside a Java program. Anyone have any suggestions?
There are a number of possible solutions available to you depending on how your data is derived...
The most basic would be to ensure you are using a fixed width font...
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));
}
}
}
This is great if your piping content from another source (like an external command).
If you have control of the content, you could use String.format, but again, unless you're using a fixed width font, it won't make any difference, you will still have formatting issues.
Another solution would be to use a html table in a JEditorPane, then the font doesn't matter
Another solution might be to use a JTable which is designed to present data in a tabular form. See How to Use Tables for more details
Updated
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.
I doubt very highly that it's a bug, as this is been used by hundreds if not thousands of people every day...but without a runnable example which demonstrates your problem it's impossible to know for sure...
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.
I beg to differ...
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);
}
}
}
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