SeekableByteChannel from Files.newByteChannel : SeekableByteChannel « JDK 7 « Java

1. Java
2. JDK 7
3. SeekableByteChannel

SeekableByteChannel from Files.newByteChannel

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Test {

  public static void main(String[] args) throws IOException {
    Path path = Paths.get("/users.txt");

    try (SeekableByteChannel sbc = Files.newByteChannel(path)) {
      ByteBuffer buffer = ByteBuffer.allocate(1024);

      sbc.position(4);
      sbc.read(buffer);
      for (int i = 0; i < 5; i++) {
        System.out.print((char) buffer.get(i));
      }

      buffer.clear();
      sbc.position(0);
      sbc.read(buffer);
      for (int i = 0; i < 4; i++) {
        System.out.print((char) buffer.get(i));
      }

    }
  }

}

 

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