Печать входного streamа Java из процесса

Обработка выходного streamа процесса в отдельном streamе может помочь здесь. Вы также хотите явно дождаться завершения процесса, прежде чем продолжить свою логику:

 ProcessBuilder builder = new ProcessBuilder("java", textFieldMemory.getText(), "-jar", myJar); final Process process = builder.start(); final Thread ioThread = new Thread() { @Override public void run() { try { final BufferedReader reader = new BufferedReader( new InputStreamReader(process.getInputStream())); String line = null; while ((line = reader.readLine()) != null) { System.out.println(line); } reader.close(); } catch (final Exception e) { e.printStackTrace(); } } }; ioThread.start(); process.waitFor(); 

В основном, из какой-то небольшой информации, это звучит так, как будто вы выполняете этот процесс и читаете InputStream из Event Dispatching Thread.

Все, что блокирует EDT, не позволит ему обрабатывать запросы перерисовки, вместо этого вы должны использовать что-то вроде SwingWorker который имеет функциональность, позволяющую вам обновлять интерфейс с помощью EDT.

Взгляните на параллелизм в Swing для получения более подробной информации

 import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.Graphics2D; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.util.List; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.SwingWorker; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; public class PBDemo { public static void main(String[] args) throws Exception { new PBDemo(); } public PBDemo() { 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 TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { public TestPane() { setLayout(new BorderLayout()); JTextArea ta = new JTextArea(); add(new JScrollPane(ta)); new ProcessWorker(ta).execute(); } @Override public Dimension getPreferredSize() { return new Dimension(200, 200); } } public interface Consumer { public void consume(String value); } public class ProcessWorker extends SwingWorker implements Consumer { private JTextArea textArea; public ProcessWorker(JTextArea textArea) { this.textArea = textArea; } @Override protected void process(List chunks) { for (String value : chunks) { textArea.append(value); } } @Override protected Integer doInBackground() throws Exception { // Forced delay to allow the screen to update Thread.sleep(5000); publish("Starting...\n"); int exitCode = 0; ProcessBuilder pb = new ProcessBuilder("java.exe", "-jar", "HelloWorld.jar"); pb.directory(new File("C:\\DevWork\\personal\\java\\projects\\wip\\StackOverflow\\HelloWorld\\dist")); pb.redirectError(); try { Process pro = pb.start(); InputConsumer ic = new InputConsumer(pro.getInputStream(), this); System.out.println("...Waiting"); exitCode = pro.waitFor(); ic.join(); System.out.println("Process exited with " + exitCode + "\n"); } catch (Exception e) { System.out.println("sorry" + e); } publish("Process exited with " + exitCode); return exitCode; } @Override public void consume(String value) { publish(value); } } public static class InputConsumer extends Thread { private InputStream is; private Consumer consumer; public InputConsumer(InputStream is, Consumer consumer) { this.is = is; this.consumer = consumer; start(); } @Override public void run() { try { int in = -1; while ((in = is.read()) != -1) { // System.out.print((char) in); consumer.consume(Character.toString((char)in)); } } catch (IOException exp) { exp.printStackTrace(); } } } } , import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.Graphics2D; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.util.List; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.SwingWorker; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; public class PBDemo { public static void main(String[] args) throws Exception { new PBDemo(); } public PBDemo() { 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 TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { public TestPane() { setLayout(new BorderLayout()); JTextArea ta = new JTextArea(); add(new JScrollPane(ta)); new ProcessWorker(ta).execute(); } @Override public Dimension getPreferredSize() { return new Dimension(200, 200); } } public interface Consumer { public void consume(String value); } public class ProcessWorker extends SwingWorker implements Consumer { private JTextArea textArea; public ProcessWorker(JTextArea textArea) { this.textArea = textArea; } @Override protected void process(List chunks) { for (String value : chunks) { textArea.append(value); } } @Override protected Integer doInBackground() throws Exception { // Forced delay to allow the screen to update Thread.sleep(5000); publish("Starting...\n"); int exitCode = 0; ProcessBuilder pb = new ProcessBuilder("java.exe", "-jar", "HelloWorld.jar"); pb.directory(new File("C:\\DevWork\\personal\\java\\projects\\wip\\StackOverflow\\HelloWorld\\dist")); pb.redirectError(); try { Process pro = pb.start(); InputConsumer ic = new InputConsumer(pro.getInputStream(), this); System.out.println("...Waiting"); exitCode = pro.waitFor(); ic.join(); System.out.println("Process exited with " + exitCode + "\n"); } catch (Exception e) { System.out.println("sorry" + e); } publish("Process exited with " + exitCode); return exitCode; } @Override public void consume(String value) { publish(value); } } public static class InputConsumer extends Thread { private InputStream is; private Consumer consumer; public InputConsumer(InputStream is, Consumer consumer) { this.is = is; this.consumer = consumer; start(); } @Override public void run() { try { int in = -1; while ((in = is.read()) != -1) { // System.out.print((char) in); consumer.consume(Character.toString((char)in)); } } catch (IOException exp) { exp.printStackTrace(); } } } }