Any possibility to execute shell script from java file?

Question

I have one Java file named app.java which extracts the servers in my application.
I need to connect to every server in that list and extract the logs. In loop, I have to call script for connecting to every machine. Is it possible to call shell script from java file ? Any suggestions please.

Here I am adding sample example:

for (int m = 0; m < AppDetailsN.length(); ++m)
{
    JSONObject AppUsernIP=AppDetailsN.getJSONObject(m));
    Iterator keys = AppUsernIP.keys();

    while(keys.hasNext()) {
        String key = (String)keys.next();
        System.out.println("key:"+key);
        String value = (String)AppUsernIP.get(key);
        System.out.println("value "+value);
        if(key == "user")
            // Store value to user variable
            // [..]  
        if (key == "ip")
            //store value to IP variable 
            // [..]          
    }

    //Here I want to call the script with that username and IP and password 
}

Answer 1

You could use Runtime.exec(). Here is a very simple example:

import java.io.*;
import java.util.*;

class Foo {
    public static void main(String[] args) throws Exception {
        // Run command and wait till it's done
        Process p = Runtime.getRuntime().exec("ping -n 3 www.google.de");
        p.waitFor();

        // Grab output and print to display
        BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));

        String line = "";
        while ((line = reader.readLine()) != null) {
            System.out.println(line);
        }
    }
}