CODEWITHSUNDEEP
javaphpweb-services
Likoed
Likoed

Reputation: 543

How to get output from runnable jar on PHP

I'm a student learning computer engineering.

today, I ran a runnable jar file from command line.

the runnable jar file contains only 5 line code like following.

public class Main {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}

and I could see "Hello World" from command line.

but when I ran the same runnable jar file from PHP I got only empty output.

this is the code from php

<?php
    echo shell_exec("java -jar /Users/Test/Desktop/test.jar");
?>

How can I get output after running the jar file on PHP ?

Thanks in advance for your answer and sorry for my poor english. If you don't understand my question please make a comment.

Upvotes: 2

Views: 1729

Answers (3)

zuups
zuups

Reputation: 1150

I was able to get shell output, running commands with phpseclib. It's a bit more tricky but allows you to execute commands under another user (and also in another server if needed).

  • create user with rights to run your jar
  • create public/private key pair to that user give read access to your webserver to user's private key (that's why you don't want to use your personal user account)
  • install phpseclib: add something like "phpseclib/phpseclib": "~2.0" to your composer.json and make composer update or use some other way to make it available to your code

use phpseclib\Crypt\RSA;
use phpseclib\Net\SSH2;

$key = new RSA();
            
$key->loadKey(file_get_contents('ssh_private_key_location'));

$ssh = new SSH2('server address/ip');

if (!$ssh->login('username'), $key)) {
    echo 'Login Failed';
} else {
    echo $ssh->exec('java -jar /path/to/test.jar');
}

If this code doesn't work out of the box, you can practice your investigation skills ;)

Upvotes: 0

Sarmad Mahar
Sarmad Mahar

Reputation: 55

You will have to put your Jar File inside the WWW folder and you will be get output. 

<?php
    exec('java -jar search.jar -query "find my dog"', $output);
    print_r($output);

?>

Upvotes: 3

dice89
dice89

Reputation: 479

You could redirect your output of the jar into a textfile like in this post:

How Can I Pipe the Java Console Output to File Without Java Web Start?

So e.g. 

java -jar /Users/Test/Desktop/test.jar >file.txt  2>&1

Then you can use busy waiting, to see whether the file is created or not, by calling :

while (! file_exists ( "/Users/Test/Desktop/file.txt" ) ){
  //do nothing
}
//now you can access the output of the file

This should work for your use case, but still you should reconsider your application design, because in a productive environment this will not scale.

Cheers

Upvotes: 2

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