Collecting many buffers in a gathering write - Java File Path IO

Java examples for File Path IO:ByteBuffer

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Description

Collecting many buffers in a gathering write

Demo Code

import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.GatheringByteChannel;
import java.util.LinkedList;
import java.util.List;

public class Main {
  private static final String fileName = "test.txt";

  public static void main(String[] argv) throws Exception {
    int reps = 10;

    FileOutputStream fos = new FileOutputStream(fileName);
    GatheringByteChannel gatherChannel = fos.getChannel();
    ByteBuffer[] bs = utterBS(reps);
    while (gatherChannel.write(bs) > 0) {
      // Loop until write( ) returns zero
    }/*from  www.j ava  2  s .  c o  m*/
    System.out.println(fileName);

    fos.close();
  }

  private static String newline = System.getProperty("line.separator");
  private static ByteBuffer[] utterBS(int howMany) throws Exception {
    List list = new LinkedList();
    for (int i = 0; i < howMany; i++) {
      list.add(pickRandom());
      list.add(pickRandom());
      list.add(pickRandom());
    }
    ByteBuffer[] bufs = new ByteBuffer[list.size()];
    list.toArray(bufs);
    return (bufs);
  }
  private static ByteBuffer pickRandom()
      throws Exception {
    String string = "asdf";
    int total = string.length();
    ByteBuffer buf = ByteBuffer.allocate(total);
    buf.put(string.getBytes("US-ASCII"));
    buf.flip();
    return (buf);
  }
}

Result


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