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Can any body help me in knowing how to pass a parameter from a Java program to a Batch file which is also used in the same java program.

The following stub indicates the piece of code where I run the batch file

Runtime rt = Runtime.getRuntime();
rt.exec("C:/test.bat");

I need to know if I could pass some parameters to test.bat which is used in the above snippet.

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  • Could you tell us why you need to run a batch program? Commented Jun 26, 2009 at 12:14

4 Answers 4

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This should work:

String[] cmd = { "C:/test.bat", "param1", "param2" }
Runtime rt = Runtime.getRuntime();
rt.exec(cmd);
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you can use a string array as the arg to Runtime.getRuntime().exec(). see the JavaDoc

 public Process exec(String[] cmdarray) throws IOException
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Wrong answer. envp - array of strings, each element of which has environment variable settings in the format name=value, or null if the subprocess should inherit the environment of the current process.
You linked the right overload, but wrote the wrong one. envp is a array of environment variables, not an array of parameters. The right one is exec(String[] cmdarray) (just a single String[]), as given by ammoQ.
you are right. the link was the original, but i too quick to copy the signature out of source! sorry @Harish, if i led you astray. it has been corrected.
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I am pretty sure you just stick it on the end the string, same as if you were to run it on a command line:

rt.exec("C:/test.bat "+someparm+" "+anotherparm);
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Why can't you insert the parameters into the exec() call?

 rt.exec("C:/test.bat <param 1>...");

I think the syntax to get at the parameters in the bat file is:

%1 for first param    
%2 for second...
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