Java中的标准错误

在ProcessBuilder上设置redirectErrorStream属性以将stderr输出发送到stdout:

ProcessBuilder builder = new ProcessBuilder(command);
builder.redirectErrorStream(true);

然后,您应该创建一个线程来处理流程流,如下所示:

Process p = builder.start();

InputHandler outHandler = new InputHandler(p.getInputStream());

其中InputHandler定义为:

private static class InputHandler extends Thread {

    private final InputStream is;

    private final ByteArrayOutputStream os;

    public InputHandler(InputStream input) {
        this.is = input;
        this.os = new ByteArrayOutputStream();
    }

    public void run() {
        try {
            int c;
            while ((c = is.read()) != -1) {
                os.write(c);
            }
        } catch (Throwable t) {
            throw new IllegalStateException(t);
        }
    }

    public String getOutput() {
        try {
        os.flush();
        } catch (Throwable t) {
            throw new IllegalStateException(t);
        }
        return os.toString();
    }

}

或者,只需为InputStream和ErrorStream创建两个InputHandler。知道如果你不读程序就会被阻塞,这是战斗的90%:)

只有两个线程,一个从stdout读取,一个从stderr读取?