Java进程无法从gpg.exe捕获InputStream,OutputStream

时间:2011-11-27 09:17:27

标签: java gnupg runtime.exec processbuilder

我正在尝试使用gpg.exe --passphrase-file my.passphrase --decrypt --output MTR241_20111124.htm MTR241_20111124.htm.gpg解密(不使用--batch和--yes选项)。如果有人关心使用它来测试gpg.exe --passphrase-file ..\BE\src\my.passphrase --symmetric --output MTR241_20111124.htm.gpg MTR241_20111124.htm,我也会提供加密命令。

有两种情况。 情况1:输出目录中不存在MTR241_20111124.htm文件。命令提示符和捕获的exec输出流都提供相同的输出。

C:\Eclipse\workspace2\sync_inbox>gpg.exe  --passphrase-file ..\BE\src\my.passphrase --decrypt --output MTR241_20111124.htm MTR241_20111124.htm.gpg
Reading passphrase from file descriptor 3
gpg: CAST5 encrypted data
gpg: encrypted with 1 passphrase
gpg: WARNING: message was not integrity protected

java exec和命令提示符会打印相同的消息。

C:\Eclipse\workspace2\sync_inbox>gpg.exe  --passphrase-file ..\BE\src\my.passphrase --decrypt --output MTR241_20111124.htm MTR241_20111124.htm.gpg
inp>gpg.exe  --passphrase-file ..\BE\src\my.passphrase --decrypt --output MTR241_20111124.htm MTR241_20111124.htm.gpg
gpg.exe  --passphrase-file ..\BE\src\my.passphrase --decrypt --output MTR241_20111124.htm MTR241_20111124.htm.gpg
gpg: CAST5 encrypted data
gpg: encrypted with 1 passphrase
gpg: WARNING: message was not integrity protected

到目前为止还不错

案例2:当输出文件在命令提示符中按预期存在时,它询问我是否要替换。

C:\Eclipse\workspace2\sync_inbox>gpg.exe  --passphrase-file ..\BE\src\my.passphrase --decrypt --output MTR241_20111124.htm MTR241_20111124.htm.gpg
Reading passphrase from file descriptor 3
gpg: CAST5 encrypted data
gpg: encrypted with 1 passphrase
File `MTR241_20111124.htm' exists. Overwrite? (y/N) y
gpg: WARNING: message was not integrity protected

但是这个输出来自java程序,它挂在第一行之后。它不会在控制台上打印任何行。如果我在控制台中输入'y',它不接受输入和处理。它只是挂起。我必须手动终止进程taskkill / F / IM gpg.exe,然后java控制台程序接受更多的命令和进程。

C:\Eclipse\workspace2\sync_inbox>gpg.exe  --passphrase-file ..\BE\src\my.passphrase --decrypt --output MTR241_20111124.htm MTR241_20111124.htm.gpg
inp>gpg.exe  --passphrase-file ..\BE\src\my.passphrase --decrypt --output MTR241_20111124.htm MTR241_20111124.htm.gpg
gpg.exe  --passphrase-file ..\BE\src\my.passphrase --decrypt --output MTR241_20111124.htm MTR241_20111124.htm.gpg
    --hangs here-- 

正常的交互式命令当然有效,比如说:

F:\eclipse\workspace\HTMLProcessor\BEQuery>copy hello.txt world.txt
inp>copy hello.txt world.txt
copy hello.txt world.txt
Overwrite world.txt? (Yes/No/All): y
inp>y
y
        1 file(s) copied.

所以这就是我的问题,为什么只有当它询问提示是否替换现有的输出文件时,它才能捕获gpg的输出流。

我已经尝试过Runtime.exec(),ProcessBuilder,Plexus-Utils,ExpectJ,Ant在java程序中运行这个gpg.exe所有这些都显示相同的结果无法捕获该特殊进程的输出流案件。我甚至尝试编写一个 .bat 文件来运行gpg --decrypt,但即便如此,它也无法在上面的特殊情况下捕获输出流。

我认为这很重要,gpg.exe的起源。好吧,我在便携式git发行版中得到它,在bin文件夹中gpg.exe可用。

我的问题变得非常冗长乏味,但仍然适合那些喜欢指出错误的java代码

package com.ycs.ezlink.scheduler.cmd;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import org.apache.log4j.Logger;

public class CmdRunner {
    private static Logger logger = Logger.getLogger(CmdRunner.class);

    static class StreamGobbler extends Thread
    {
        InputStream is;
        String type;

        StreamGobbler(InputStream is, String type)
        {
            this.is = is;
            this.type = type;
        }

        public void run() {
            try {
                System.out.println("in run!");
                    System.out.println(type);
                    final byte[] buffer = new byte[1];
                    for (int length = 0; (length = is.read(buffer)) != -1;) {
                        System.out.write(buffer, 0, length);
                    }
                } catch (IOException ioe) {
                    ioe.printStackTrace();
                }
        }
    }

    public static int process(String cmd){
        int exitVal = 0; 
        try {
            Runtime rt = Runtime.getRuntime();
             Process proc = rt.exec(cmd);
             // any error message?
             StreamGobbler errorGobbler = new 
                 StreamGobbler(proc.getErrorStream(), "ERROR");            

             // any output?
             StreamGobbler outputGobbler = new 
                 StreamGobbler(proc.getInputStream(), "OUTPUT");

             // kick them off
             errorGobbler.start();
             outputGobbler.start();

             // any error???
             System.out.println("Waiting for cmd process to complete " );
            exitVal = proc.waitFor();
             System.out.println("ExitValue: " + exitVal);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }    
        return exitVal;
    }

    public static void main(String[] a) throws IOException, InterruptedException, TimeoutException, ExpectJException {
        String gzipCmd = "gpg.exe  --passphrase-file C:/Eclipse/workspace2/BE/src/my.passphrase --decrypt --output C:/Eclipse/workspace2/sync_inbox/MTR241_20111124.htm C:/Eclipse/workspace2/sync_inbox/MTR241_20111124.htm.gpg";  
        //CmdRunner.process(gzipCmd); ///--fails
        //ProcessBuilder pb = new ProcessBuilder("gpg", "--passphrase-file", "C:/Eclipse/workspace2/BE/src/my.passphrase",
        "--decrypt","--output","C:/Eclipse/workspace2/sync_inbox/MTR241_20111124.htm",
        "C:/Eclipse/workspace2/sync_inbox/MTR241_20111124.htm.gpg"); ///--fails
        ProcessBuilder pb = new ProcessBuilder ("cmd");
        pb.redirectErrorStream(true);
        Process process = pb.start();
        OutputStream stdin = process.getOutputStream ();
        InputStream stderr = process.getErrorStream ();
        InputStream stdout = process.getInputStream ();
         StreamGobbler errorGobbler = new StreamGobbler(stderr, "ERROR");            
         errorGobbler.start();
         StreamGobbler stdoutGobbler = new StreamGobbler(stdout, "DEBUG");            
         stdoutGobbler.start();

         BufferedReader scan = new BufferedReader(new InputStreamReader(System.in));
         String line;
         while ((line = scan.readLine())!= null) {
                String input = line;
                System.out.println("inp>"+input);
                if (input.trim().equals("exit")) {
                    stdin.write("exit\r\n".getBytes()); 
                    stdin.flush();
                    break;
                } else {
                     stdin.write((input+"\r\n").getBytes());
                     stdin.flush();
                }
            }
         System.out.println("exited..");
        int returnCode  = process.waitFor();
        System.out.println(returnCode);
    }
}

如果我使用gpg --batch选项,最后一个字,它不再提示y/N输入,因此它运行顺利。但我很想知道,为什么会有这个问题。虽然我觉得gpg.exe最初是为Unix / Linux平台编写的,所以可能会有一些输入输出文件重定向,但我想了解更多关于它的根本原因,以便下次我知道什么寻找。

1 个答案:

答案 0 :(得分:2)

您在终端中看到的输出是标准输出流,标准错误流和控制台的合并结果。您可以捕获标准输出和标准错误流。但你无法捕获控制台。这就是为什么gpg 故意直接使用控制台,以防止您捕获。为什么他们这样做是值得商榷的。

结论:您将无法捕获直接处理控制台的程序的输入或输出流。