Automating Command Line

Below are 2 ways to run commands using the command line and get the result.

Using ProcessBuilder

Run cmd commands

String[] commands = {"cmd.exe", "/c", "java -version"};
ProcessBuilder builder = new ProcessBuilder(commands);

//Redirect the process's standard error into standard output
builder.redirectErrorStream(true);
Process process = builder.start();

BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));

log.info("Here is the output of the command:\n");
String s;
while ((s = stdInput.readLine()) != null) {
	log.info(s);
}

2. Using Runtime.getRuntime().exec()

Run cmd commands

Runtime runtime = Runtime.getRuntime();
String[] commands = {"cmd.exe", "/c", "ping google.com"};
Process process = runtime.exec(commands);

BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));
BufferedReader stdError = new BufferedReader(new InputStreamReader(process.getErrorStream()));

// Read the output from the command
log.info("Here is the standard output of the command:\n");
String s;
while ((s = stdInput.readLine()) != null) {
	log.info(s);
}

// Read any errors from the attempted command
log.info("Here is the standard error of the command (if any):\n");
while ((s = stdError.readLine()) != null) {
	log.info(s);
}

Full example code:

CmdTask.java

package eu.ibagroup.easyrpa.cmd;

import eu.ibagroup.easyrpa.engine.annotation.ApTaskEntry;
import eu.ibagroup.easyrpa.engine.apflow.ApTask;
import lombok.extern.slf4j.Slf4j;

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

@ApTaskEntry(name = "Cmd Automation")
@Slf4j
public class CmdTask extends ApTask {

	@Override
	public void execute() {

		try {
			printJavaVersion();
			pingGoogle();
		} catch (Exception e) {
			log.error("Error occurred", e);
		}
	}

	private void printJavaVersion() throws IOException {

		String[] commands = { "cmd.exe", "/c", "java -version" };
		ProcessBuilder builder = new ProcessBuilder(commands);

		// Redirect the process's standard error into standard output
		builder.redirectErrorStream(true);
		Process process = builder.start();

		BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));

		log.info("Here is the output of the command:\n");
		String s;
		while ((s = stdInput.readLine()) != null) {
			log.info(s);
		}
	}

	private void pingGoogle() throws IOException {

		Runtime runtime = Runtime.getRuntime();
		String[] commands = { "cmd.exe", "/c", "ping google.com" };
		Process process = runtime.exec(commands);

		BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));
		BufferedReader stdError = new BufferedReader(new InputStreamReader(process.getErrorStream()));

		// Read the output from the command
		log.info("Here is the standard output of the command:\n");
		String s;
		while ((s = stdInput.readLine()) != null) {
			log.info(s);
		}

		// Read any errors from the attempted command
		log.info("Here is the standard error of the command (if any):\n");
		while ((s = stdError.readLine()) != null) {
			log.info(s);
		}

	}
}

CmdDemoAp.java

package eu.ibagroup.easyrpa.cmd;

import eu.ibagroup.easyrpa.engine.annotation.ApModuleEntry;
import eu.ibagroup.easyrpa.engine.apflow.ApModule;
import eu.ibagroup.easyrpa.engine.apflow.TaskOutput;

@ApModuleEntry(name = "KB - Cmd Automation Demo")
public class CmdDemoAp extends ApModule {

	public TaskOutput run() throws Exception {
		return execute(getInput(), CmdTask.class).get();
	}
}

CmdDemoApLocalRunner.java

package eu.ibagroup.easyrpa.cmd;

import eu.ibagroup.easyrpa.engine.boot.ApModuleRunner;

public class CmdDemoApLocalRunner {

	public static void main(String[] args) {
		ApModuleRunner.localLaunch(CmdDemoAp.class);
	}
}