33 lines
975 B
Java
33 lines
975 B
Java
|
//: io/GetChannel.java
|
|||
|
|
// <20>2015 MindView LLC: see Copyright.txt
|
|||
|
|
// Getting channels from streams
|
|||
|
|
import java.nio.*;
|
|||
|
|
import java.nio.channels.*;
|
|||
|
|
import java.io.*;
|
|||
|
|
public class GetChannel {
|
|||
|
|
private static final int BSIZE = 1024;
|
|||
|
|
public static void main(String[] args) throws Exception {
|
|||
|
|
// Write a file:
|
|||
|
|
FileChannel fc =
|
|||
|
|
new FileOutputStream("data.txt").getChannel();
|
|||
|
|
fc.write(ByteBuffer.wrap("Some text ".getBytes()));
|
|||
|
|
fc.close();
|
|||
|
|
// Add to the end of the file:
|
|||
|
|
fc =
|
|||
|
|
new RandomAccessFile("data.txt", "rw").getChannel();
|
|||
|
|
fc.position(fc.size()); // Move to the end
|
|||
|
|
fc.write(ByteBuffer.wrap("Some more".getBytes()));
|
|||
|
|
fc.close();
|
|||
|
|
// Read the file:
|
|||
|
|
fc = new FileInputStream("data.txt").getChannel();
|
|||
|
|
ByteBuffer buff = ByteBuffer.allocate(BSIZE);
|
|||
|
|
fc.read(buff);
|
|||
|
|
buff.flip();
|
|||
|
|
while(buff.hasRemaining())
|
|||
|
|
System.out.write(buff.get());
|
|||
|
|
System.out.flush();
|
|||
|
|
}
|
|||
|
|
} /* Output:
|
|||
|
|
Some text Some more
|
|||
|
|
*///:~
|