Java exec executeCommand(String command, boolean waitForResponse)

Description

execute Command

License

Open Source License

Declaration

public static String executeCommand(String command,
            boolean waitForResponse) 

Method Source Code

//package com.java2s;
// Released under the Apache License, Version 2.0

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;

public class Main {
    private static final boolean DEBUG = false;

    public static String executeCommand(String command,
            boolean waitForResponse) {

        String response = "";
        ProcessBuilder pb = null;

        pb = new ProcessBuilder("bash", "-c", command);
        pb.redirectErrorStream(true);/*w  w w . j av  a2s .  co m*/

        if (DEBUG) {
            System.out.println("Command: " + command);
        }

        try {
            Process shell = pb.start();
            if (waitForResponse) {

                // To capture output from the shell
                InputStream shellIn = shell.getInputStream();

                // Wait for the shell to finish and get the return code
                int shellExitStatus = shell.waitFor();

                if (DEBUG) {
                    System.out.println("Exit status = " + shellExitStatus);
                }

                response = convertStreamToStr(shellIn);
                shellIn.close();
            }

        } catch (IOException e) {
            System.out
                    .println("Error occured while executing command. Error Description: "
                            + e.getMessage());
        } catch (InterruptedException e) {
            System.out
                    .println("Error occured while executing command. Error Description: "
                            + e.getMessage());
        }

        return response;
    }

    public static String convertStreamToStr(InputStream is)
            throws IOException {

        if (is != null) {
            Writer writer = new StringWriter();

            char[] buffer = new char[1024];
            try {
                Reader reader = new BufferedReader(new InputStreamReader(
                        is, "UTF-8"));
                int n;
                while ((n = reader.read(buffer)) != -1) {
                    writer.write(buffer, 0, n);
                }
            } finally {
                is.close();
            }
            return writer.toString();
        } else {
            return "";
        }
    }
}

Related

1. executeCommand(String command)
2. executeCommand(String command)
3. executeCommand(String command)
4. executeCommand(String command)
5. executeCommand(String command)
6. executeCommand(String[] command, boolean wait)
7. executeCommand1(boolean isProcessBuilder, String command)
8. executeCommand2(boolean isProcessBuilder, String command)
9. executeCommandAndExtractStdOut(String cmd)