Java exec executeShellCommand(String command)

Description

execute Shell Command

License

Apache License

Declaration

public static Process executeShellCommand(String command) throws IOException, InterruptedException 

Method Source Code

//package com.java2s;
/**//from   w ww . j a  v a 2s . co m
 * Copyright [2011] [Datasalt Systems S.L.]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.
 */

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 {
    public static Process executeShellCommand(String command) throws IOException, InterruptedException {
        Runtime runtime = Runtime.getRuntime();
        Process process = runtime.exec(command);
        process.waitFor();
        if (process.exitValue() != 0) {
            String error = convertStreamToString(process.getErrorStream());
            String output = convertStreamToString(process.getInputStream());
            throw new RuntimeException(output + "\n" + error); //TODO change this for a proper named exception
        }

        return process;
    }

    /**
     * Reads an InputStream and dumps it to a stream
     * @param is
     * @throws IOException
     */
    public static String convertStreamToString(InputStream is) throws IOException {
        /*
        * To convert the InputStream to String we use the
        * Reader.read(char[] buffer) method. We iterate until the
        * Reader return -1 which means there's no more data to
        * read. We use the StringWriter class to produce the string.
        */
        if (is != null) {
            Writer writer = new StringWriter();

            char[] buffer = new char[1024];
            try {
                Reader reader = 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 "";
        }
    }
}

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