java – 从批处理文件的进程中读取InputStream会跳到下一行

我正在尝试使用Runtime.exec()运行批处理文件,然后将其InputStream输出到JTextArea.我有什么作品,但只是部分.批处理文件运行会发生什么,但如果它执行除“echo”之外的命令,该命令会立即终止并执行下一行.例如,假设我尝试运行这样一个简单的批处理文件：

@echo off
echo hello. waiting 5 seconds.
timeout /t 5 /nobreak > NUL
echo finished. goodbye.

批处理文件执行,JTextArea说

hello. waiting 5 seconds.
finished. goodbye.

但它不会在中间等待5秒钟.

我无法弄清楚为什么这样做.这是我用来运行批处理文件并读取其InputStream的内容.

private class ScriptRunner implements Runnable {
private final GUI.InfoGUI gui; // the name of my GUI class
private final String script;

public ScriptRunner(final GUI.InfoGUI gui,final File script) {
    this.gui = gui;
    this.script = script.getAbsolutePath();
}

@Override
public void run() {
    try {
        final Process p = Runtime.getRuntime().exec(script);
        StreamReader output = new StreamReader(p.getInputStream(),gui);
        Thread t = new Thread(output);
        t.start();
        int exit = p.waitFor();
        output.setComplete(true);
        while (t.isAlive()) {
            sleep(500);
        }
        System.out.println("Processed finished with exit code " + exit);
    } catch (final Exception e) {
        e.printStackTrace();
    }
}

}
private class StreamReader implements Runnable {
private final InputStream is;
private final GUI.InfoGUI gui;

private boolean complete = false;

public StreamReader(InputStream is,GUI.InfoGUI gui) {
    this.is = is;
    this.gui = gui;
}

@Override
public void run() {
    BufferedReader in = new BufferedReader(new InputStreamReader(is));
    try {
        while (!complete || in.ready()) {
            while (in.ready()) {
                gui.setTextAreaText(in.readLine() + "n");
            }
            sleep(250);
        }
    } catch (final Exception e) {
        e.printStackTrace();
    } finally {
            try {
                in.close();
        } catch (final Exception e) {
                e.printStackTrace();
    }
}

public void setComplete(final boolean complete) {
    this.complete = complete;
}

}
public void sleep(final long ms) {
try {
    Thread.sleep(ms);
} catch (final InterruptedException ie) {
}
}

我知道我的代码非常混乱,我确信它包含语法错误.

感谢您提供的任何帮助！

final Process p = Runtime.getRuntime().exec(script);

final ProcessBuilder pb = new ProcessBuilder(script);
        pb.redirectErrorStream(true);
        final Process p = pb.start();

hello. waiting 5 seconds.
ERROR: Input redirection is not supported,exiting the process immediately.
finished. goodbye.
Processed finished with exit code 0