从Java servlet运行可执行jar文件

Question

I want to run executable jar located in /WEB-INF/lib from my java servlet and get the output. tried :

Process procesSH;
BuffererdReader br = null;
ProcessBuilder pb = new ProcessBuilder("/WEB-INF/lib/jarName.jar", "-jar", "parma01 parma02");
procesSH = pb.start(); // start pb
br = BuffererdReader(new InputStreamReader(procesSH.getInputStream()));
system.out.println(br.readLine()); // read just one line for now 

The error I get is:

CreateProcess error = 2, system cannot find file specified.

The file is located under /WEB-INF/lib , if there is more info needed I will post it.

Thanks.

Answer 1

The path /WEB-INF/lib/jarName.jar obviously did not work, here is a way to obtain an absolute path to the jar via the ServletContext :

ServletContext context = ...
String jarpath = context.getRealPath("/WEB-INF/lib/jarName.jar");
ProcessBuilder pb = new ProcessBuilder(jarpath, "-jar", "parma01 parma02");