Re: Executing batch files stored in Jar

From:
=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>
Newsgroups:
comp.lang.java.programmer
Date:
Mon, 12 Nov 2007 21:43:23 -0500
Message-ID:
<47390f44$0$90270$14726298@news.sunsite.dk>
zfkmk@yahoo.com wrote:

On Nov 12, 7:59 am, Arne VajhHj <a...@vajhoej.dk> wrote:

You mean:

program-that-read-from-jar-and-write-to-stdout | cmd

?

Interesting idea.

I don't know if it will work.


Why not? Well, depending on what the OP wants, there may be issues, of
course. I just tried the following quick and dirty test and it seems
to work:

import java.io.*;
import java.util.*;
import static java.lang.System.out;

public class Bat {
  public static void main (String[] args) throws Exception {
    String bat =
      "echo Hello\n" +
      "set java=%SystemRoot%\\system32\\java.exe\n" +
      "set | find \"java\"\n" +
      "dir %java%\n";
    Runtime rt = Runtime.getRuntime ();
    Process process = rt.exec ("cmd");
    InputStream stderr = process.getErrorStream ();
    InputStream stdout = process.getInputStream ();
    OutputStream stdin = process.getOutputStream ();
    stdin.write (bat.getBytes ());
    stdin.close ();
    BufferedReader br;
    String line;
    br = new BufferedReader (new InputStreamReader (stdout));
    while ((line = br.readLine ()) != null)
      out.println ("stdout=" + line);
    br = new BufferedReader (new InputStreamReader (stderr));
    while ((line = br.readLine ()) != null)
      out.println ("stderr=" + line);
  }
}


Yep.

But try with:

     String bat =
        "@echo off\n" +
        "goto bot\n" +
        ":top\n" +
        "echo top\n" +
        "goto fin\n" +
        ":bot\n" +
        "echo bot\n" +
        "goto top\n" +
        ":fin\n";

Arne

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