如何在JFrame/JPanel中可视化控制台java
我使用Swing库编写了一个Java程序。如何在JFrame/JPanel中可视化控制台java,java,swing,console,jtextarea,jtextcomponent,Java,Swing,Console,Jtextarea,Jtextcomponent,我使用Swing库编写了一个Java程序。 现在,我想将我的控制台输出重定向到JFrame或JPanel中。一旦您拥有了JFrame或JPanel,请向其添加一个文本字段 JTextArea是一个不错的选择,因为它有多行。 添加后,您可以.append('text')到它,而不是写入System.out.print() 您需要创建一个OutputStream,将输出重新定向到文本区域,并实现OutputStream接口的所有必要方法,然后在主程序中,将标准输出重定向到此流中。我曾在我的一个程序中
现在,我想将我的控制台输出重定向到JFrame或JPanel中。一旦您拥有了
JFrame
或JPanel
,请向其添加一个文本字段
JTextArea
是一个不错的选择,因为它有多行。
添加后,您可以.append('text')编码>到它,而不是写入System.out.print()代码>
您需要创建一个OutputStream,将输出重新定向到文本区域,并实现OutputStream接口的所有必要方法,然后在主程序中,将标准输出重定向到此流中。我曾在我的一个程序中使用过类似的内容:
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);
}
}
您可以通过以下方式进行演示:
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();
}
});
}
}
我知道我迟到了,但对于那些正在寻找更好、更简洁答案的人来说,我让这个巫婆结合了两个自定义类
Console.java
public class Console {
final JFrame frame = new JFrame("CONSOLE");
ColorPane textPane;
JScrollPane scroll;
public Console() throws Exception {
textPane = new ColorPane();
textPane.setPreferredSize(new Dimension(525, 600));
textPane.setFont(new Font("Lucida Console", Font.BOLD, 12));
scroll = new JScrollPane(textPane);
textPane.setBackground(Color.BLACK);
scroll.setVerticalScrollBarPolicy ( ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS );
textPane.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void insertUpdate(DocumentEvent e) {
scrollToBottom(scroll);
}
@Override
public void removeUpdate(DocumentEvent e) {
}
@Override
public void changedUpdate(DocumentEvent e) {
}
});
//Add textPane in to middle panel
frame.add(scroll);
frame.setSize(100, 600);
frame.pack();
frame.setVisible(false);
redirectOut();
}
public PrintStream redirectOut() {
OutputStream out = new OutputStream() {
@Override
public void write(int b) throws IOException {
textPane.append(Color.WHITE, String.valueOf((char) b));
}
};
OutputStream errOut = new OutputStream() {
@Override
public void write(int b) throws IOException {
textPane.append(Color.RED, String.valueOf((char) b));
}
};
PrintStream ps = new PrintStream(out);
PrintStream err = new PrintStream(errOut);
System.setOut(ps);
System.setErr(err);
scrollToBottom(scroll);
return ps;
}
public JFrame getFrame() {
return frame;
}
private void scrollToBottom(JScrollPane scrollPane) {
JScrollBar verticalBar = scrollPane.getVerticalScrollBar();
AdjustmentListener downScroller = new AdjustmentListener() {
@Override
public void adjustmentValueChanged(AdjustmentEvent e) {
Adjustable adjustable = e.getAdjustable();
adjustable.setValue(adjustable.getMaximum());
verticalBar.removeAdjustmentListener(this);
}
};
verticalBar.addAdjustmentListener(downScroller);
}
}
及
ColorPane.java
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.AttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
public class ColorPane extends JTextPane {
public void appendNaive(Color c, String s) { // naive implementation
// bad: instiantiates a new AttributeSet object on each call
SimpleAttributeSet aset = new SimpleAttributeSet();
StyleConstants.setForeground(aset, c);
int len = getText().length();
setCaretPosition(len); // place caret at the end (with no selection)
setCharacterAttributes(aset, false);
replaceSelection(s); // there is no selection, so inserts at caret
}
public void append(Color c, String s) { // better implementation--uses
// StyleContext
StyleContext sc = StyleContext.getDefaultStyleContext();
AttributeSet aset = sc.addAttribute(SimpleAttributeSet.EMPTY,
StyleConstants.Foreground, c);
int len = getDocument().getLength(); // same value as
// getText().length();
setCaretPosition(len); // place caret at the end (with no selection)
setCharacterAttributes(aset, false);
replaceSelection(s); // there is no selection, so inserts at caret
}
public static boolean isPrime(int n) {
if (n < 2)
return false;
double max = Math.sqrt(n);
for (int j = 2; j <= max; j += 1)
if (n % j == 0)
return false; // j is a factor
return true;
}
public static boolean isPerfectSquare(int n) {
int j = 1;
while (j * j < n && j * j > 0)
j += 1;
return (j * j == n);
}
}
导入java.awt.Color;
导入javax.swing.JFrame;
导入javax.swing.JScrollPane;
导入javax.swing.JTextPane;
导入javax.swing.text.AttributeSet;
导入javax.swing.text.SimpleAttributeSet;
导入javax.swing.text.StyleConstants;
导入javax.swing.text.StyleContext;
公共类ColorPane扩展了JTextPane{
public void appendNaive(颜色c,字符串s){//naive实现
//错误:在每次调用中设置一个新的AttributeSet对象
SimpleAttributeSet aset=新的SimpleAttributeSet();
setForeground(aset,c);
int len=getText().length();
setCaretPosition(len);//将插入符号放在末尾(无选择)
setCharacterAttributes(aset,false);
replaceSelection(s);//没有选择,因此在插入符号处插入
}
公共void append(颜色c,字符串s){//更好的实现--使用
//样式上下文
StyleContext sc=StyleContext.getDefaultStyleContext();
AttributeSet aset=sc.addAttribute(SimpleAttributeSet.EMPTY,
前景色,c);
int len=getDocument().getLength();//与相同的值
//getText().length();
setCaretPosition(len);//将插入符号放在末尾(无选择)
setCharacterAttributes(aset,false);
replaceSelection(s);//没有选择,因此在插入符号处插入
}
公共静态布尔iPrime(int n){
if(n<2)
返回false;
双倍最大值=数学sqrt(n);
对于(int j=2;j 0)
j+=1;
返回(j*j==n);
}
}
这是我一直在使用的解决方案,它甚至有彩色输出。
顺便说一句,sry代表糟糕的英语(我只有11岁)那么你到底有什么问题?也许可以将所有这些内容附加到另一个Swing组件(例如JTextArea
)?好的,我读到了。我还以为还有别的办法呢。因为已经有println了,所以我不想添加新的textarea并附加它们
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.AttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
public class ColorPane extends JTextPane {
public void appendNaive(Color c, String s) { // naive implementation
// bad: instiantiates a new AttributeSet object on each call
SimpleAttributeSet aset = new SimpleAttributeSet();
StyleConstants.setForeground(aset, c);
int len = getText().length();
setCaretPosition(len); // place caret at the end (with no selection)
setCharacterAttributes(aset, false);
replaceSelection(s); // there is no selection, so inserts at caret
}
public void append(Color c, String s) { // better implementation--uses
// StyleContext
StyleContext sc = StyleContext.getDefaultStyleContext();
AttributeSet aset = sc.addAttribute(SimpleAttributeSet.EMPTY,
StyleConstants.Foreground, c);
int len = getDocument().getLength(); // same value as
// getText().length();
setCaretPosition(len); // place caret at the end (with no selection)
setCharacterAttributes(aset, false);
replaceSelection(s); // there is no selection, so inserts at caret
}
public static boolean isPrime(int n) {
if (n < 2)
return false;
double max = Math.sqrt(n);
for (int j = 2; j <= max; j += 1)
if (n % j == 0)
return false; // j is a factor
return true;
}
public static boolean isPerfectSquare(int n) {
int j = 1;
while (j * j < n && j * j > 0)
j += 1;
return (j * j == n);
}
}