Java InputStream to OutputStream copyStream(InputStream input, OutputStream output, boolean closeStreams)

Description

Copies one stream to another, optionally closing the streams.

License

Apache License

Parameter

Parameter	Description
input	the data to copy
output	where to copy the data
closeStreams	if true input and output will be closed when the method returns

Exception

Parameter	Description
RuntimeException	if the copy failed

Return

the number of bytes copied

Declaration

public static long copyStream(InputStream input, OutputStream output, boolean closeStreams)
        throws RuntimeException 

Method Source Code

//package com.java2s;
/*/*from  ww  w  .j  a v a 2 s  .  c o m*/
 * Copyright 2015 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * 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.BufferedInputStream;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class Main {
    /**
     * Copies one stream to another, optionally closing the streams.
     *
     * @param input the data to copy
     * @param output where to copy the data
     * @param closeStreams if true input and output will be closed when the method returns
     * @return the number of bytes copied
     * @throws RuntimeException if the copy failed
     */
    public static long copyStream(InputStream input, OutputStream output, boolean closeStreams)
            throws RuntimeException {
        long numBytesCopied = 0;
        int bufferSize = 32768;
        try {
            // make sure we buffer the input
            input = new BufferedInputStream(input, bufferSize);
            byte[] buffer = new byte[bufferSize];
            for (int bytesRead = input.read(buffer); bytesRead != -1; bytesRead = input.read(buffer)) {
                output.write(buffer, 0, bytesRead);
                numBytesCopied += bytesRead;
            }
            output.flush();
        } catch (IOException ioe) {
            throw new RuntimeException("Stream data cannot be copied", ioe);
        } finally {
            if (closeStreams) {
                try {
                    output.close();
                } catch (IOException ioe2) {
                    // what to do?
                }
                try {
                    input.close();
                } catch (IOException ioe2) {
                    // what to do?
                }
            }
        }
        return numBytesCopied;
    }
}

Related

1. copyStream(InputStream input, OutputStream output)
2. copyStream(InputStream input, OutputStream output)
3. copyStream(InputStream input, OutputStream output)
4. copyStream(InputStream input, OutputStream output)
5. copyStream(InputStream input, OutputStream output)
6. copyStream(InputStream input, OutputStream output, boolean closeStreams)
7. copyStream(InputStream input, OutputStream output, int bufferSize)
8. copyStream(InputStream input, OutputStream output, int length)
9. copyStream(InputStream inputStream, OutputStream outputStream)