copy Completely (InputStream input, OutputStream output) : Copy « File « Java Tutorial






import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.channels.FileChannel;

/*
 * 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.    
 */

public class Main {
  public static void copyCompletely(InputStream input, OutputStream output) throws IOException {
    // if both are file streams, use channel IO
    if ((output instanceof FileOutputStream) && (input instanceof FileInputStream)) {
      try {
        FileChannel target = ((FileOutputStream) output).getChannel();
        FileChannel source = ((FileInputStream) input).getChannel();

        source.transferTo(0, Integer.MAX_VALUE, target);

        source.close();
        target.close();

        return;
      } catch (Exception e) { /* failover to byte stream version */
      }
    }

    byte[] buf = new byte[8192];
    while (true) {
      int length = input.read(buf);
      if (length < 0)
        break;
      output.write(buf, 0, length);
    }

    try {
      input.close();
    } catch (IOException ignore) {
    }
    try {
      output.close();
    } catch (IOException ignore) {
    }
  }

}








11.78.Copy
11.78.1.Copy the source file system structure into the supplied target location.
11.78.2.Buffered copying between source(InputStream, Reader, String and byte[]) and destinations (OutputStream, Writer, String and byte[]).
11.78.3.Copies all data from an input stream to an output stream.
11.78.4.Copies the contents of the Reader into the Writer, until the end of the stream has been reached.
11.78.5.Copy a directory and all of its contents.
11.78.6.Copy a file and user buffer
11.78.7.Copy chars from a Reader to a Writer.
11.78.8.copy Completely (InputStream input, OutputStream output)
11.78.9.copy Completely (Reader input, Writer output)
11.78.10.copy Completely(URI input, URI output)
11.78.11.Buffered copying
11.78.12.Copy file and directory