从Java调用Perl脚本（Eclipse中的JAX-WS）

Question

I have a JAX-WS webservice that receives a string as parameter, calls a Perl script, and returns the string converted to upper case. It is running on Tomcat 8 (localhost on Eclipse).

When I type from the console:

curl -X POST --data "mystring=HelloWorld" http://localhost:8080/MyServices/api/generatePath

Everything works except for the Perl call. On the debugger I see that line is executed, but apparently nothing happens (not even errors). If I run perl /home/me/workspace/match.pl from the console it works perfectly. The path of the match.pl file is correct.

In addition, process.exitValue() return 2.

@Path("/")
public class MyServices {
    @POST
    @Path("/generatePath")
    @Produces(MediaType.APPLICATION_JSON)

    public Response generatePathService(
            @FormParam("mystring") String myString) {

        Process process = null;

        try {
            process = Runtime.getRuntime().exec("perl /home/me/workspace/match.pl --lang en");
        }
        catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 

        return Response.status(200).entity(myString.toUpperCase()).build();
    }
}

Answer 1

I got similar stuff some time ago. The solution for me was to 'accept' the output of the program. Something like this:

Process p = Runtime.getRuntime().exec(cmd);
final InputStream is = p.getInputStream();
new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            while (is.available() != 0) {
                is.read();
            }
        } catch (IOException ex) {
        }
    }
}).start();

You should also try to get the error stream with p.getErrorStream() . An alternative could be to change your perl program in that way that there is nothing printed to standard out or error out.

Or you call a shell script and redirect the output to dev/null (someting like ´blabla>/dev/null`.