Mapping an entire file into memory for reading : Input Output Stream « File Input Output « Java
Mapping an entire file into memory for reading
// : c12:MappedFile.java
// Mapping an entire file into memory for reading.
// {Args: MappedFile.java}
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import java.io.File;
import java.io.FileInputStream;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
public class MappedFile {
public static void main(String[] args) throws Exception {
if (args.length != 1) {
System.out.println("argument: sourcefile");
System.exit(1);
}
long length = new File(args[0]).length();
MappedByteBuffer in = new FileInputStream(args[0]).getChannel().map(
FileChannel.MapMode.READ_ONLY, 0, length);
int i = 0;
while (i < length)
System.out.print((char) in.get(i++));
}
} ///:~
