Android Shell Run runSimpleCommand(String command, String directory)

Description

Runs a simple command in given directory.

License

Open Source License

Parameter

Parameter	Description
command	The command to run
directory	The working directory to run the command in

Exception

Parameter	Description
IOException	If the command failed
InterruptedException	If the command was halted

Return

Standard output from the command.

Declaration

public static String runSimpleCommand(String command, String directory)
        throws IOException, InterruptedException 

Method Source Code

/*//w  w  w.  j  a va2s.c om
  Copyright (c) Inexas 2010

  Modifications licensed under the Inexas Software License V1.0. You
  may not use this file except in compliance with the License.

  The License is available at: http://www.inexas.com/ISL-V1.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

  The original file and contents are licensed under a separate license:
  see below.
 */

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;
import org.apache.log4j.Logger;

public class Main{
    private static final Logger log = Logger.getLogger(FileUtil.class);
    /**
     * Runs a simple command in given directory. The environment is inherited
     * from the parent process (e.g. the one in which this Java VM runs).
     * 
     * @return Standard output from the command.
     * @param command
     *            The command to run
     * @param directory
     *            The working directory to run the command in
     * @throws IOException
     *             If the command failed
     * @throws InterruptedException
     *             If the command was halted
     */
    public static String runSimpleCommand(String command, String directory)
            throws IOException, InterruptedException {
        StringBuffer result = new StringBuffer();

        log.info("Running simple command " + command + " in " + directory);

        Process process = Runtime.getRuntime().exec(command, null,
                new File(directory));

        BufferedReader stdout = null;
        BufferedReader stderr = null;

        try {
            stdout = new BufferedReader(new InputStreamReader(
                    process.getInputStream()));
            stderr = new BufferedReader(new InputStreamReader(
                    process.getErrorStream()));

            String line;

            while ((line = stdout.readLine()) != null) {
                result.append(line + "\n");
            }

            StringBuffer error = new StringBuffer();
            while ((line = stderr.readLine()) != null) {
                error.append(line + "\n");
            }

            if (error.length() > 0) {
                log.error("Command failed, error stream is: " + error);
            }

            process.waitFor();

        } finally {
            // we must close all by exec(..) opened streams:
            // http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4784692
            process.getInputStream().close();
            if (stdout != null)
                stdout.close();
            if (stderr != null)
                stderr.close();
        }

        return result.toString();
    }
}

Related

1. executeCommand(String command)
2. normalShell(String normalCommand)
3. runAsRoot(String[] commands)
4. doShellCommand(String[] cmds, StringBuilder log, boolean runAsRoot, boolean waitFor)
5. findProcessId(String command)
6. findProcessIdWithPidOf(String command)
7. findProcessIdWithPS(String command)