通过PsExec时程序输出丢失

Question

(这是我的同事在其他地方发布的一个问题,但我想我会在这里发布,看看我是否能够吸引不同的观众.)

大家好,我正在测试编写一个小型Java应用程序的可能性,它将使用Psexec启动远程作业.在测试将java程序的stdin和stdout绑定到psexec的过程中,我遇到了一个奇怪的错误.

我的测试程序是一个基本的echo程序.它启动一个线程从stdin读取,然后将读取输出直接传递回stdout.当在本地机器上运行时,而不是从psexec运行时,它运行得很漂亮.正是应该的.

但是,当我从PsExec调用它时,第一次将输入直接传送到stdout时它会丢失.是什么让这个错误真的很棒,它只是第一次将输入直接输入stdout而丢失了.如果输入String附加到另一个字符串,它可以正常工作.String字符串或String变量.但是,如果输入String直接发送到stdout,则它不会通过.它第二次发送到stdout它经历了很好的 - 每次都在那之后.

我完全不知道这里发生了什么.我试图测试我能想到的每一个可能的错误.我没有想法.我错过了一个或者这只是psexec里面的东西吗？

这是有问题的代码,它有三个类(其中一个实现了一个单一函数interace的接口).

主类:

public class Main {
    public static void main(String[] args) {
        System.out.println("Starting up.");

        CReader input = new CReader(new BufferedReader(
            new InputStreamReader(System.in)));
        CEcho echo = new CEcho();

        input.addInputStreamListener(echo);
        input.start();

        System.out.println("Successfully started up.  Awaiting input.");
    }
}

CReader类,它是从stdin读取的线程:

public class CReader extends Thread {
    private ArrayList<InputStreamListener> listeners = 
        new ArrayList<InputStreamListener>();
    private boolean exit = false;
    private Reader in;

    public CReader(Reader in) {
        this.in = in;
    }

    public void addInputStreamListener(InputStreamListener listener) {
        listeners.add(listener);
    }

    public void fireInputRecieved(String input) {

        if(input.equals("quit"))
        exit = true;

        System.out.println("Input string has made it to fireInputRecieved: "
            + input);

        for(int index = 0; index < listeners.size(); index++)
            listeners.get(index).inputRecieved(input);
    }

    @Override
    public void run() {

        StringBuilder sb = new StringBuilder();
        int current = 0, last = 0;

        while (!exit) {
            try {
                current = in.read();
            }
            catch (IOException e) {
                System.out.println("Encountered IOException.");
            }

            if (current == -1) {
                break;
            }

            else if (current == (int) '\r') {
                if(sb.toString().length() == 0) {
                    // Extra \r, don't return empty string.
                    continue;
                }
                fireInputRecieved(new String(sb.toString()));
                sb = new StringBuilder();
            }

            else if(current == (int) '\n') {
                if(sb.toString().length() == 0) {
                    // Extra \n, don't return empty string.
                    continue;
                }
                fireInputRecieved(new String(sb.toString()));
                sb = new StringBuilder();
            }
            else {
                System.out.println("Recieved character: " + (char)current);
                sb.append((char) current);
                last = current;
            }
        }       
    }
}

CEcho类,它是将它传回stdout的类:

public class CEcho implements InputStreamListener {
    public void inputRecieved(String input) {
        System.out.println("\n\nSTART INPUT RECIEVED");
        System.out.println("The input that has been recieved is: "+input);
        System.out.println("It is a String, that has been copied from a " +
            "StringBuilder's toString().");
        System.out.println("Outputting it cleanly to standard out: ");
        System.out.println(input);
        System.out.println("Outputting it cleanly to standard out again: ");
        System.out.println(input);
        System.out.println("Finished example outputs of input: "+input);
        System.out.println("END INPUT RECIEVED\n\n");
    }
}

最后,这是程序输出:

>psexec \\remotecomputer "C:\Program Files\Java\jre1.6.0_05\bin\java.exe" -jar "C:\Documents and Settings\testProram.jar"

PsExec v1.96 - Execute processes remotely
Copyright (C) 2001-2009 Mark Russinovich
Sysinternals - www.sysinternals.com


Starting up.
Successfully started up.  Awaiting input.
Test
Recieved character: T
Recieved character: e
Recieved character: s
Recieved character: t
Input string has made it to fireInputRecieved: Test


START INPUT RECIEVED
The input that has been recieved is: Test
It is a String, that has been copied from a StringBuilder's toString().
Outputting it cleanly to standard out:

Outputting it cleanly to standard out again:
Test
Finished example outputs of input: Test
END INPUT RECIEVED

Answer 1

您是否尝试过将输出重定向到文件（ java... >c:\output.txt ）？这样你就可以仔细检查所有内容是否都进入标准输出，并且可能只是被 psexec 吃掉