Java OutputStream Write copyBytes(InputStream in, OutputStream out, int buffSize, boolean close)

Description

Copies from one stream to another.

License

Apache License

Parameter

Parameter	Description
in	InputStrem to read from
out	OutputStream to write to
buffSize	the size of the buffer
close	whether or not close the InputStream and OutputStream at the end. The streams are closed in the finally clause.

Declaration

public static void copyBytes(InputStream in, OutputStream out, int buffSize, boolean close) throws IOException 

Method Source Code

//package com.java2s;
/**/*from  ww  w.j  a  v a  2  s.  c o m*/
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.slf4j.Logger;
import java.io.*;

public class Main {
    /**
     * Copies from one stream to another.
     * 
     * @param in
     *            InputStrem to read from
     * @param out
     *            OutputStream to write to
     * @param buffSize
     *            the size of the buffer
     * @param close
     *            whether or not close the InputStream and OutputStream at the
     *            end. The streams are closed in the finally clause.
     */
    public static void copyBytes(InputStream in, OutputStream out, int buffSize, boolean close) throws IOException {
        try {
            copyBytes(in, out, buffSize);
            if (close) {
                out.close();
                out = null;
                in.close();
                in = null;
            }
        } finally {
            if (close) {
                closeStream(out);
                closeStream(in);
            }
        }
    }

    /**
     * Copies from one stream to another.
     * 
     * @param in
     *            InputStrem to read from
     * @param out
     *            OutputStream to write to
     * @param buffSize
     *            the size of the buffer
     */
    public static void copyBytes(InputStream in, OutputStream out, int buffSize) throws IOException {
        PrintStream ps = out instanceof PrintStream ? (PrintStream) out : null;
        byte buf[] = new byte[buffSize];
        int bytesRead = in.read(buf);
        while (bytesRead >= 0) {
            out.write(buf, 0, bytesRead);
            if ((ps != null) && ps.checkError()) {
                throw new IOException("Unable to write to output stream.");
            }
            bytesRead = in.read(buf);
        }
    }

    /**
     * Closes the stream ignoring {@link IOException}. Must only be called in
     * cleaning up from exception handlers.
     * 
     * @param stream
     *            the Stream to close
     */
    public static void closeStream(Closeable stream) {
        cleanup(null, stream);
    }

    /**
     * Close the Closeable objects and <b>ignore</b> any {@link IOException} or
     * null pointers. Must only be used for cleanup in exception handlers.
     * 
     * @param log
     *            the log to record problems to at debug level. Can be null.
     * @param closeables
     *            the objects to close
     */
    public static void cleanup(Logger log, Closeable... closeables) {
        for (Closeable c : closeables) {
            if (c != null) {
                try {
                    c.close();
                } catch (IOException e) {
                    if (log != null) {
                        log.warn("Exception in closing " + c, e);
                    }
                }
            }
        }
    }
}

Related

1. copyBytes(InputStream input, int size, OutputStream output)
2. copyBytes(InputStream inputStream, OutputStream outputStream, int size)
3. copyBytes(InputStream is, DataOutputStream[] os, long numBytes)
4. copyBytes(InputStream is, OutputStream bytes)