How to build a communication between nodejs and java?

Question

I have Foo.java file

package mypack;
class Foo {
  public int add (int a, int b) {
    return a+b;
  } 
}

and a Bar.java

package mypack;
class Bar {
  public static void main (String args[]) {
    Foo instance = new Foo();
    System.out.println(Foo.add(2, 3));
  }
}

and I have a server.js file in which I am using shelljs to read the outputs and print it in the terminal shell.

var shelljs = require('shelljs');

shelljs.exec('java -cp bin mypack.Bar', function (code, output) {
   console.log(output);
});

when I run node server.js I get the output

5
5

The first one is getting printed by the java print statement while the second one is printed by nodejs console statement. My question is how can I modify the java output such that it will only be read by the node and not printed in the shell? so, that I get only the output from the node console statement.

Vivin Paliath · Accepted Answer · 2015-07-29 21:43:52Z

2

It looks like there is a silent option which tells it not to print program-output to console:

shelljs.exec('java -cp bin mypack.Bar', {silent: true}, function (code, output) {
   console.log(output);
});

Take a look at the documentation.

answered Jul 29, 2015 at 21:43

Vivin Paliath

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