Java exec execWithResult(String cmd)

Description

exec With Result

License

Open Source License

Declaration

public static String execWithResult(String cmd) throws IOException 

Method Source Code

//package com.java2s;
/**//  w w w .  j  a  v a 2  s  . com
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;

public class Main {
    public static String execWithResult(String cmd) throws IOException {
        return execWithResult(cmd, false);
    }

    public static String execWithResult(String cmd, boolean error) throws IOException {
        Process process = exec(cmd);

        InputStream in = null;

        if (error) {
            in = process.getErrorStream();
        } else {
            in = process.getInputStream();
        }

        return _readStreamToString(in);
    }

    public static Process exec(File dir, String cmd) throws IOException {
        String fullCmd = dir.getPath() + "/" + cmd;

        Runtime runtime = Runtime.getRuntime();

        return runtime.exec(fullCmd);
    }

    public static Process exec(String fullCmd) throws IOException {
        Runtime runtime = Runtime.getRuntime();

        return runtime.exec(fullCmd);
    }

    private static String _readStreamToString(InputStream contents) throws IOException {
        if (contents == null) {
            return null;
        }

        char[] buffer = new char[0x10000];

        StringBuilder out = new StringBuilder();

        Reader in = new InputStreamReader(contents, "UTF-8");

        int read;

        do {
            read = in.read(buffer, 0, buffer.length);

            if (read > 0) {
                out.append(buffer, 0, read);
            }
        } while (read >= 0);

        contents.close();

        return out.toString();
    }
}

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