如何将用户的输入(仅限用户输入)发送到输出流？
我目前正在使用 key 列表器，
jTextArea console = new jTextArea;
console.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent e){
//save the last lines for console to variable input
if(e.getKeyCode() == java.awt.event.KeyEvent.VK_ENTER){
try {
int line = console.getLineCount() -2;
int start = console.getLineStartOffset(line);
int end = console.getLineEndOffset(line);
input = console.getText(start, end - start);
send = true;
} catch (Exception e1) {
e1.printStackTrace();
}
}
}
});`
正如您所看到的，当用户按下Enter键时，控制台的整个最后一行，textarea。
我想要发生的是，仅发送用户输入，而不是整个最后一行。 任何帮助将不胜感激。
最佳答案
好吧，这就是我的想法......
基本思想是我们要跟踪“用户”输入和“进程”输出。
基本上，我所做的就是对其进行设置，以便当进程终止时，我们计算文档中插入符号的当前位置，并将其标记为用户输入的开始位置。
此示例不包括将输出写入进程，您可以将其滑入;)
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.BadLocationException;
import org.w3c.dom.ls.LSException;
public class QuickTerminal {
public static void main(String[] args) {
new QuickTerminal();
}
public QuickTerminal() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new ConsolePane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public interface CommandListener {
public void commandOutput(String text);
public void commandCompleted(String cmd, int result);
public void commandFailed(Exception exp);
}
public class ConsolePane extends JPanel implements CommandListener {
private JTextArea textArea;
private int userInputStart = 0;
private Command cmd;
public ConsolePane() {
cmd = new Command(this);
setLayout(new BorderLayout());
textArea = new JTextArea(20, 30);
add(new JScrollPane(textArea));
textArea.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ENTER) {
int range = textArea.getCaretPosition() - userInputStart;
try {
String text = textArea.getText(userInputStart, range).trim();
System.out.println("[" + text + "]");
userInputStart += range;
if (!cmd.isRunning()) {
cmd.execute(text);
} else {
}
} catch (BadLocationException ex) {
Logger.getLogger(QuickTerminal.class.getName()).log(Level.SEVERE, null, ex);
}
} else {
// if (!cmd.isRunning()) {
// cmd.send(...);
// }
}
}
});
}
@Override
public void commandOutput(String text) {
SwingUtilities.invokeLater(new AppendTask(textArea, text));
}
@Override
public void commandFailed(Exception exp) {
SwingUtilities.invokeLater(new AppendTask(textArea, "Command failed - " + exp.getMessage()));
}
@Override
public void commandCompleted(String cmd, int result) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
int pos = textArea.getCaretPosition();
System.out.println("pos = " + pos + "; length = " + textArea.getText().length());
textArea.setCaretPosition(textArea.getText().length());
userInputStart = pos;
}
});
}
}
public class AppendTask implements Runnable {
private JTextArea textArea;
private String text;
public AppendTask(JTextArea textArea, String text) {
this.textArea = textArea;
this.text = text;
}
@Override
public void run() {
textArea.append(text);
}
}
public class Command {
private CommandListener listener;
private ProcessRunner runner;
public Command(CommandListener listener) {
this.listener = listener;
}
public boolean isRunning() {
return runner != null && runner.isAlive();
}
public void execute(String cmd) {
if (!cmd.trim().isEmpty()) {
List<String> values = new ArrayList<>(25);
if (cmd.contains("\"")) {
while (cmd.contains("\"")) {
String start = cmd.substring(0, cmd.indexOf("\""));
cmd = cmd.substring(start.length());
String quote = cmd.substring(cmd.indexOf("\"") + 1);
cmd = cmd.substring(cmd.indexOf("\"") + 1);
quote = quote.substring(0, cmd.indexOf("\""));
cmd = cmd.substring(cmd.indexOf("\"") + 1);
if (!start.trim().isEmpty()) {
String parts[] = start.trim().split(" ");
values.addAll(Arrays.asList(parts));
}
values.add(quote.trim());
}
if (!cmd.trim().isEmpty()) {
String parts[] = cmd.trim().split(" ");
values.addAll(Arrays.asList(parts));
}
for (String value : values) {
System.out.println("[" + value + "]");
}
} else {
if (!cmd.trim().isEmpty()) {
String parts[] = cmd.trim().split(" ");
values.addAll(Arrays.asList(parts));
}
}
runner = new ProcessRunner(listener, values);
}
}
public void send(String cmd) {
// Send user input to the running process...
}
}
public class ProcessRunner extends Thread {
private List<String> cmds;
private CommandListener listener;
public ProcessRunner(CommandListener listener, List<String> cmds) {
this.cmds = cmds;
this.listener = listener;
start();
}
@Override
public void run() {
try {
System.out.println("cmds = " + cmds);
ProcessBuilder pb = new ProcessBuilder(cmds);
pb.redirectErrorStream();
Process p = pb.start();
StreamReader reader = new StreamReader(listener, p.getInputStream());
// Need a stream writer...
int result = p.waitFor();
// Terminate the stream writer
reader.join();
listener.commandCompleted(null, result);
} catch (Exception exp) {
exp.printStackTrace();
}
}
}
public class StreamReader extends Thread {
private InputStream is;
private CommandListener listener;
public StreamReader(CommandListener listener, InputStream is) {
this.is = is;
this.listener = listener;
start();
}
@Override
public void run() {
try {
int value = -1;
while ((value = is.read()) != -1) {
listener.commandOutput(Character.toString((char) value));
}
} catch (IOException exp) {
exp.printStackTrace();
}
}
}
}
PS-我在 Mac 上运行此程序，因此您可能需要在 Windows 上调用“cmd”...;)
PPS-这是一个不完整的示例，如果不是凌晨 1 点，我可能会填写它，但是，这并不能阻止用户按回退键超出最后一个已知的用户输入位置。如果我要解决这个问题，我会使用 DocumentFilter 并简单地“保护”用户位置之前的所有文本，禁止用户删除它
更新了“Protected DocumentFilter”示例
向 Document 的 protected 区域添加了“ protected ”DocumentFilter，用户不应再允许编辑该区域。
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
public class QuickTerminal {
public static void main(String[] args) {
new QuickTerminal();
}
public QuickTerminal() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new ConsolePane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public interface CommandListener {
public void commandOutput(String text);
public void commandCompleted(String cmd, int result);
public void commandFailed(Exception exp);
}
public class ConsolePane extends JPanel implements CommandListener, UserInput {
private JTextArea textArea;
private int userInputStart = 0;
private Command cmd;
public ConsolePane() {
cmd = new Command(this);
setLayout(new BorderLayout());
textArea = new JTextArea(20, 30);
((AbstractDocument)textArea.getDocument()).setDocumentFilter(new ProtectedDocumentFilter(this));
add(new JScrollPane(textArea));
textArea.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ENTER) {
int range = textArea.getCaretPosition() - userInputStart;
try {
String text = textArea.getText(userInputStart, range).trim();
System.out.println("[" + text + "]");
userInputStart += range;
if (!cmd.isRunning()) {
cmd.execute(text);
} else {
}
} catch (BadLocationException ex) {
Logger.getLogger(QuickTerminal.class.getName()).log(Level.SEVERE, null, ex);
}
} else {
// if (!cmd.isRunning()) {
// cmd.send(...);
// }
}
}
});
}
@Override
public void commandOutput(String text) {
SwingUtilities.invokeLater(new AppendTask(textArea, text));
}
@Override
public void commandFailed(Exception exp) {
SwingUtilities.invokeLater(new AppendTask(textArea, "Command failed - " + exp.getMessage()));
}
@Override
public void commandCompleted(String cmd, int result) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
int pos = textArea.getCaretPosition();
System.out.println("pos = " + pos + "; length = " + textArea.getText().length());
textArea.setCaretPosition(textArea.getText().length());
userInputStart = pos;
}
});
}
@Override
public int getUserInputStart() {
return userInputStart;
}
}
public interface UserInput {
public int getUserInputStart();
}
public class AppendTask implements Runnable {
private JTextArea textArea;
private String text;
public AppendTask(JTextArea textArea, String text) {
this.textArea = textArea;
this.text = text;
}
@Override
public void run() {
textArea.append(text);
}
}
public class Command {
private CommandListener listener;
private ProcessRunner runner;
public Command(CommandListener listener) {
this.listener = listener;
}
public boolean isRunning() {
return runner != null && runner.isAlive();
}
public void execute(String cmd) {
if (!cmd.trim().isEmpty()) {
List<String> values = new ArrayList<>(25);
if (cmd.contains("\"")) {
while (cmd.contains("\"")) {
String start = cmd.substring(0, cmd.indexOf("\""));
cmd = cmd.substring(start.length());
String quote = cmd.substring(cmd.indexOf("\"") + 1);
cmd = cmd.substring(cmd.indexOf("\"") + 1);
quote = quote.substring(0, cmd.indexOf("\""));
cmd = cmd.substring(cmd.indexOf("\"") + 1);
if (!start.trim().isEmpty()) {
String parts[] = start.trim().split(" ");
values.addAll(Arrays.asList(parts));
}
values.add(quote.trim());
}
if (!cmd.trim().isEmpty()) {
String parts[] = cmd.trim().split(" ");
values.addAll(Arrays.asList(parts));
}
for (String value : values) {
System.out.println("[" + value + "]");
}
} else {
if (!cmd.trim().isEmpty()) {
String parts[] = cmd.trim().split(" ");
values.addAll(Arrays.asList(parts));
}
}
runner = new ProcessRunner(listener, values);
}
}
public void send(String cmd) {
// Send user input to the running process...
}
}
public class ProcessRunner extends Thread {
private List<String> cmds;
private CommandListener listener;
public ProcessRunner(CommandListener listener, List<String> cmds) {
this.cmds = cmds;
this.listener = listener;
start();
}
@Override
public void run() {
try {
System.out.println("cmds = " + cmds);
ProcessBuilder pb = new ProcessBuilder(cmds);
pb.redirectErrorStream();
Process p = pb.start();
StreamReader reader = new StreamReader(listener, p.getInputStream());
// Need a stream writer...
int result = p.waitFor();
// Terminate the stream writer
reader.join();
listener.commandCompleted(null, result);
} catch (Exception exp) {
exp.printStackTrace();
}
}
}
public class StreamReader extends Thread {
private InputStream is;
private CommandListener listener;
public StreamReader(CommandListener listener, InputStream is) {
this.is = is;
this.listener = listener;
start();
}
@Override
public void run() {
try {
int value = -1;
while ((value = is.read()) != -1) {
listener.commandOutput(Character.toString((char) value));
}
} catch (IOException exp) {
exp.printStackTrace();
}
}
}
public class ProtectedDocumentFilter extends DocumentFilter {
private UserInput userInput;
public ProtectedDocumentFilter(UserInput userInput) {
this.userInput = userInput;
}
public UserInput getUserInput() {
return userInput;
}
@Override
public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException {
if (offset >= getUserInput().getUserInputStart()) {
super.insertString(fb, offset, string, attr);
}
}
@Override
public void remove(FilterBypass fb, int offset, int length) throws BadLocationException {
if (offset >= getUserInput().getUserInputStart()) {
super.remove(fb, offset, length); //To change body of generated methods, choose Tools | Templates.
}
}
@Override
public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
if (offset >= getUserInput().getUserInputStart()) {
super.replace(fb, offset, length, text, attrs); //To change body of generated methods, choose Tools | Templates.
}
}
}
}
关于java - jTextArea 作为 IO 控制台，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15017148/