Re: Executing batch files stored in Jar

From:
 Eugene Zharkov <zfkmk@yahoo.com>
Newsgroups:
comp.lang.java.programmer
Date:
Tue, 13 Nov 2007 03:16:18 -0000
Message-ID:
<1194923778.701096.218010@v2g2000hsf.googlegroups.com>
On Nov 12, 8:43 pm, Arne Vajh=F8j <a...@vajhoej.dk> wrote:

zf...@yahoo.com wrote:

On Nov 12, 7:59 am, Arne Vajh=F8j <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


Oh well. I guess it is not that simple, after all.

Eugene

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