29 lines
937 B
Java
29 lines
937 B
Java
// newio/ChannelCopy.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// Copying a file using channels and buffers
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// {Args: ChannelCopy.java test.txt}
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import java.nio.*;
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import java.nio.channels.*;
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import java.io.*;
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public class ChannelCopy {
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private static final int BSIZE = 1024;
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public static void main(String[] args) throws Exception {
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if(args.length != 2) {
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System.out.println("arguments: sourcefile destfile");
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System.exit(1);
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}
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FileChannel
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in = new FileInputStream(args[0]).getChannel(),
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out = new FileOutputStream(args[1]).getChannel();
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ByteBuffer buffer = ByteBuffer.allocate(BSIZE);
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while(in.read(buffer) != -1) {
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buffer.flip(); // Prepare for writing
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out.write(buffer);
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buffer.clear(); // Prepare for reading
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}
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}
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}
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