HOW RUN SYSTEM COMMAND USING JAVA

This Post about how we run our system command using java programming. For better understanding of this article I create GUI in which I gave one text box to enter system command and button to run command.

For run system command in java we have to used

Process systemProcess = Runtime.getRuntime().exec(command);

1. JavaExecutor class in which we create JFrame using swing API.

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package com.kodemaker; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; public class JavaExecutor extends JFrame { public JavaExecutor(){ //set size,title,layout of jframe setSize(350, 400); setTitle("System Command Executor"); getContentPane().setLayout(new FlowLayout()); //create label JLabel commandLabel = new JLabel("System Command",JLabel.CENTER); commandLabel.setSize(10,50); //create command input text JTextField commandInput = new JTextField(20); commandInput.setToolTipText("Enter System Command Here"); //create result label JLabel resultLabel = new JLabel("Result",JLabel.LEFT); resultLabel.setSize(10,10); //create result label JLabel result = new JLabel("",JLabel.LEFT); //create coommand button and add listner JButton executeCommand = new JButton("Execute"); executeCommand.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { //pass command get from user and set result to result label result.setText(""); ExecuteSystemCommand exe = new ExecuteSystemCommand(); result.setText(exe.getCommandResult(commandInput.getText())); } }); // add all component to jframe add(commandLabel); add(commandInput); add(executeCommand); add(resultLabel); add(result); //show jframe setVisible(true); } }

2.  In ExecuteSystemCommand class in which I create getCommandResult method which take command as input and return output of command.

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package com.kodemaker; import java.io.BufferedReader; import java.io.InputStreamReader; public class ExecuteSystemCommand { public String getCommandResult(String command){ StringBuffer commandOutput = new StringBuffer(); Process systemProcess; try { //get system command process systemProcess = Runtime.getRuntime().exec(command); //wait for complete request systemProcess.waitFor(); BufferedReader reader = new BufferedReader(new InputStreamReader(systemProcess.getInputStream())); String readOutputLineByLine = ""; //read input line by line add into output while ((readOutputLineByLine = reader.readLine())!= null) { commandOutput.append(readOutputLineByLine + "\n"); } } catch (Exception e) { commandOutput.append("Incorrect Command"); } return commandOutput.toString(); } }

3. JavaMainExecuter  main class to initiate our application.

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package com.kodemaker; import javax.swing.JFrame; public class JavaMainExecuter { public static void main(String[] args) { // open command executer jframe JFrame frame = new JavaExecutor(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } }

Below is output of app In which you have to enter command, click on execute to run command and wait for system response to see result.