How to evoke a DOS console in Java?

Hello There,
I am trying to open a DOS console (says, cmd.exe in win2000) in Java. Obviously, the usual Runtime.getRuntime.exec("cmd") just does not work. Could someone please help me in solving this puzzle.
Many thanks,
Craig

What exactly do you want to do with the console once it is opened? The Runtime.getRuntime().exec("cmd.exe") does open a command processor. However, it will terminate when the JVM terminates.
Also, the JVM grabs hold of both the stdin and stdout handles that the console uses so there is no way for the user to interact directly with the command processor.
If you want to open a command processor that becomes completely separate from the JVM that launched it, do the following:
Runtime.getRuntime().exec("cmd.exe /c start");This will cause a command processor to be created by the JVM. The created command processor will start another command processor. The first command processor will terminate, but the second one will remain active without any ties to the JVM.
Hope this helps,
-Mike

Similar Messages

How to clear the DOS screen through java program

how to clear the DOS screen through java program

Just some Friday fun. Use the telnet program that comes with Windows and supports VT escape sequences.
import java.io.*;
import java.net.*;
public class AutoTelnet {
     private static Socket s;
     public static void main(String[] args) throws Exception {
          Thread t = new Thread() {
               @Override public void run() {
                    try {
                         s = new ServerSocket(5555).accept();
                    } catch (IOException ex) {
                         ex.printStackTrace();
          t.start();
          Process p = new ProcessBuilder("cmd", "/C", "start", "telnet", "127.0.0.1", "5555").redirectErrorStream(true).start();
          t.join();
          PrintStream ps = new PrintStream(s.getOutputStream());
          ps.println("Screen will be cleared in 5 seconds");
          ps.println("5");
          Thread.sleep(1000);
          ps.println("4");
          Thread.sleep(1000);
          ps.println("3");
          Thread.sleep(1000);
          ps.println("2");
          Thread.sleep(1000);
          ps.println("1");
          Thread.sleep(1000);
          ps.println("\u001b[2J");
          Thread.sleep(5000);
}

HOW TO PRINTLN INTO DOS CONSOLE ?

hi all,
of course you can make outputs with System.out.println("Bla"); into the JBuilder console (for example).
but what if i started my java application with a batch file?
the batch file opens a dos console/window.
how can i force the System.out.println of my code to appear into this dos window?
thanx a lot,
andi

that's what i was thinking......the start.bat is like that:
C:\jbuilder5\jdk1.3\bin\javaw -classpath "D:\Entwicklung\Java\Editor\classes;D:\Entwicklung\Java\Packages\Packages\classes;D:\Entwicklung\Java\Packages\xdogawt\CLASSES;D:\Entwicklung\Java\Packages\3rdParty\dog\dog\CLASSES;C:\jbuilder5\lib\xerces.jar;D:\Entwicklung\Java\Editor\src\Auguro.jar;D:\Entwicklung\Java\Packages\3rdParty\logkit-1.0b5.jar;C:\jbuilder5\jdk1.3\demo\jfc\Java2D\Java2Demo.jar;C:\jbuilder5\jdk1.3\jre\lib\i18n.jar;C:\jbuilder5\jdk1.3\jre\lib\jaws.jar;C:\jbuilder5\jdk1.3\jre\lib\rt.jar;C:\jbuilder5\jdk1.3\jre\lib\sunrsasign.jar;C:\jbuilder5\jdk1.3\lib\dt.jar;C:\jbuilder5\jdk1.3\lib\tools.jar" ASLEditor
and this is EXACTLY what appears into my dos window....any system.out.print from the code won't appear.....
andi

HOW DO I RUN DOS COMMANDS ON JAVA

I SWEAR, I'LL PAY YA IF YOU HELP ME!!!
Hi, this is the thing:
have you ever run the "time" command on a DOS console?? if you have, you know that it shows the current time, and lets you set a new time.
well, i need to make a java program to open a DOS console and execute the command, and making it able to write in information on the console so it sets a new time.
MY PURPOSE IS NOT JUST WATCHING THE CURRENT TIME!! so please don't tell me to use System.getCurrentTimeMillis() or something like that; i explicitly need to run that DOS command. what's the Java code to do it??
thank you!! and please attach your account # so you get a $50 deposit by the end of the week
thank you!!

Thanks a lot, you all guys, but i don't know what's with this thing.... it always throws an IOException, with the following exception stack trace:
java.io.IOException: CreateProcess: temp.bat error=0
        at java.lang.Win32Process.create(Native Method)
        at java.lang.Win32Process.<init>(Win32Process.java:63)
        at java.lang.Runtime.execInternal(Native Method)
        at java.lang.Runtime.exec(Runtime.java:550)
        at java.lang.Runtime.exec(Runtime.java:416)
        at java.lang.Runtime.exec(Runtime.java:358)
        at java.lang.Runtime.exec(Runtime.java:322)
        at Tarea.main(Tarea.java:15)and it will come out the same shit over and over. The above case was thrown by the line Runtime.getRuntime().exec("temp.bat") where temp.bat is a file where the only thing written in it is the word "time". and you can change the string parameter of the method exec, and thats what will change in the stack trace above.
I also tried "cmd", "command", and "command.com". With the last one, it opens the command.com application but it freezes and does nothing. With the other two, appears the same old shit from above.
Please help me!!
Thank you...

How to execute MS DOS command through Java program???

Dear Sir,
I want to run a MS-DOS command through my Java program. I have tried "Dir" command but no other command which takes command line args doesn't work at all. Please help.
import java.io.*;
class CommandPrompt
     public static void main(String[] args)
          try
               File file = new File("C:/Temp/Java");
               String[] cmd = {"command.com","/c","md folder"};
               String[] envp = {""};
               Process m;
               String s = "";
               m = Runtime.getRuntime().exec(cmd,null,file);
               BufferedReader buf = new BufferedReader(new InputStreamReader(m.getInputStream()));
               while ((s = buf.readLine())!=null)
                    System.out.println(s);
          catch (Exception ex)
               System.out.println("Exception is "+ex);
               ex.printStackTrace();

1. This forum is for Swing-related issues only. This question should be posted to the "Java Programming" forum.
2. Please enclose your sample code in code blocks; it's much easier to read that way. See here for how it's done: http://forum.java.sun.com/faq.jsp#messageformat
3. Please provide more information, like what error messages you got and what OS you're running. For instance, if you're running WinXP, Win2k or NT4, your command processor should be "cmd.exe", not "command.com". When I made that change, your program worked for me.

Dos command from java

hi all
how do i run dos commands from java??????????

Using Runtime#exec().
Also see http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Runtime.html

How to execute java without a DOS console?

I'm running java in the Windows platform.
Every time when I run java program, there must be a
DOS window.
Is there any way that I can run java program without a DOS console window.

Check out "executable jar files" - http://java.sun.com/docs/books/tutorial/jar/basics/run.html

How to execute DOS command in Java?

I want to execute a dos command in Java,such as execute test.bat command? How to realize it?
Thanks in advance!

http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html
I found this article really useful in solving this. Hope it helps.
Cheers,
John

How to run DOS command in Java environment?

Can i run DOS command in Java environment?
I did like this:
Runtime r = Runtime.getRuntime();
r.exec("cmd.exe");
r.exec("set classpath=%CLASSPATH%;.\\tmp")
but failed.
However if I run the java command, it runs successfully.
r.exec("javac Test.java");
r.exec("java Test");
how should I do so that i can run the DOS commands metioned above in Java Environment?
thanks a lot.

Have a look at http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html
This may help. I wonder if this is ok ?
Runtime r= Runtime.getRuntime();
r.exec("cmd.exe /C set classpath=%CLASSPATH%;.\\tmp\"");

How can DTExec show the execution package progress while running it in the DOS console?

[SSIS 2012]
Hi,
We need to view the package results/progress during the execution of the package by the DTExec command. Isn´t it possible?
The user can´t view the details for the execution by the GUI.
The package is deployed in the SSIDB (Catalog). The final idea is to Audit the result in a *.log file from the Batch we have created. We are not considering to use the "Logging" feature while designing the package. We expect to have same SSIS events
in the DOS console while executing it.
DTExec always says: To view the details for the execution, right-click on the Integration Services Catalog, and open the [All Executions] report
How could it be possible?
Thanks,
Alex Berenguer

Hi Alex,
I don’t think it is possible to display the package execution details in the Command Prompt when we execute a package stored in the SSISDB catalog. Except for enabling the package logging, we have to view the execution details from the “All Executions” Standard
Report for the SSISDB Catalog.
Regards,
Mike Yin
TechNet Community Support

How to execute a DOS PROGRAM as batch file in java

How to execute a DOS PROGRAM as batch file in java
pls help me

www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

How to execute dos command in Java program?

In Perl, it has System(command) to call dos command.
Does java have this thing?
or any other way to execute dos command in java program?
Because i must call javacto compile a file when the user inputed a java file name.

Look in the Runtime class, it is implemented using the Singleton design pattern so you have to use the static method getRuntime to get its only instance, on that instance you can invoke methods like
exec(String command) that will execute that command in a dos shell.
Regards,
Gerrit.

How to invoke dos shell from java program

Hi,
I'm not able to invoke dos shell from java.
Can any one help me in this issue.
I'm providing the source code below:
try{
Runtime.getRuntime().exec("cmd.exe")
catch(IOException e) {
System.out.println(e.getStackTrace());
Thanks

Does it throw a different exception?
Or does it just do nothing at all?
It does nothing at all[/b
Is this a standalone Java app?
Or a Java Applet running via a webbrowser? [b]It's a standalone application

Clear DOS Console

Hi, I work with java application. I use jdk to compile and execute.
When I execute this application, it's writes a DOS console. I use a System.out to print string in the DOS Console.
I try to clean DOS Console.
please, i don't know how to clean DOS Console.
thanks.

AFAIK, you can't send shell commands to your active shell window. So, you can either create a GUI with Swing components or something, or write like, 50 blank lines to System.out (HACK... COUGH).
Jason

How to execute external spawned process using java

Hi,
I am executing PGP from command line using java.
For adding the public key I use Runtime object like this
Runtime rt = Runtime.getRuntime();
Process process = rt.exec("pgp -ka "+"d:/Mangesh/pubkey/sandy.asc "+"C:/PROGRA~1/NETWOR~1/PGPNT/keyrings/pubring.pkr");PGP is executing this but inbetween it asked for confirmation "Do you want to add public key (y/n)"
I am providing data to process this way:
PrintWriter pw = new PrintWriter(new OutputStreamWriter( process.getOutputStream()));
pw.write('y');
pw.flush();But after this their is no execution from PGP and console remains until I closed it.
PGP is waiting for ENTER KEY
How can I provide ENTER KEY from java
This is right method ??? or any other options are available??
I am awaiting for your valuable suggestions .
Regards
Man479

On Windows the "enter key" consists of two characters: carriage return and a line feed (\r\n). You may have to send both. If that doesn't work, pgp is not reading the reply through stdin, only through the console, and there's no way to pass the 'y' to it through Java.

How to evoke a DOS console in Java?

Similar Messages

Maybe you are looking for