Java 使用 NIO 進行文件合并輸出

 
import java.io.;
import java.nio.;
import java.nio.channels.*;

public class NIOCat {
public static void main(String[] args) throws IOException {

if (args.length < 2) {
  System.err.println("Usage: java NIOCat inFile1 inFile2... outFile");
  return;
}

ByteBuffer[] buffers = new ByteBuffer[args.length-1];
for (int i = 0; i < args.length-1; i++) {
  RandomAccessFile raf = new RandomAccessFile(args[i], "r");
  FileChannel channel = raf.getChannel();
  buffers[i] = channel.map(FileChannel.MapMode.READ_ONLY, 0, raf.length());
}

FileOutputStream outFile = new FileOutputStream(args[args.length-1]);
FileChannel out = outFile.getChannel();
out.write(buffers);
out.close();     

}
}
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