Using Runtime.getRuntime().exec() to run perl code in java

Question

I have a perl script called pbp that takes an html file as an argument and then creates an output file. Here is my current code. Infile is obtained earlier from a JFile Chooser. I don't get any errors but there is no ouput from the perl script.

try {
            Process p = Runtime.getRuntime().exec(new String[] {"perl", "C:\\Users\\Roger\\Downloads\\The_Long-Awaited_Product_Specification_and_Sample_Files\\casey\\pbp", inFile.getAbsolutePath()});
            p.getInputStream().close();
            p.getOutputStream().close();
            p.getErrorStream().close();
            System.out.println(p.waitFor());
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } catch (InterruptedException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

And perl is doing fine from command line?

mpapec
– mpapec

2013-05-25 16:33:22 +00:00
Commented May 25, 2013 at 16:33 — mpapec
– mpapec, Commented May 25, 2013 at 16:33
Can you show the relevant parts of the perl script?

Steve P.
– Steve P.

2013-05-25 16:54:09 +00:00
Commented May 25, 2013 at 16:54 — Steve P.
– Steve P., Commented May 25, 2013 at 16:54
The perl works correctly from the command line.

user2420694
– user2420694

2013-05-25 17:32:03 +00:00
Commented May 25, 2013 at 17:32 — user2420694
– user2420694, Commented May 25, 2013 at 17:32

Juned Ahsan · Accepted Answer · 2013-05-25 16:55:39Z

0

You will not get the output of per script directly. You need to capture it using the below code:

BufferedReader stdInput = new BufferedReader(new 
     InputStreamReader(p.getInputStream()));


// read the output from the command
System.out.println("EXE OUTPUT");
while ((s = stdInput.readLine()) != null) {
    System.out.println(s);
}

answered May 25, 2013 at 16:55

Juned Ahsan

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