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Executing Shell command from Java code

Posted by on Jul 22, 2013 in Java, UNIX | 0 comments

Shell script in java
 
In this post let us learn the way of executing a shell command through a java class.

In JAVA we have a class called “java.lang.Runtime” which is used to interact with Runtime system and has facility to execute any shell commands using Runtime.getRuntime().exec() method.

 

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class ExecuteProcess {
	public void executeCommand() {
		String command = "ls -ltr";
		Runtime run = Runtime.getRuntime();
		Process process = null;
		try {
			process = run.exec(command);
		}
		catch (IOException e) {
			e.printStackTrace();
		}
		try {
			process.waitFor();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}

               BufferedReader br = new BufferedReader(new InputStreamReader(
				process.getInputStream()));
		String line = "";
		try {
			while ((line = br.readLine()) != null) {
				System.out.println(line);
			}
		} 
		catch (IOException e) {
			e.printStackTrace();
		}
	}
}

 

Note: This kind of implementations are discourage by java programming language since you will lose platform independence which is why we mostly used JAVA.

 
 Reference

 

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