Writing Files - Beginning Java 2 SDK - page 406

Try It Out - Writing Multiple Strings to a File
We will just write a series of useful proverbs to a file. Here's the code:
import java.io.*;
import java.nio.*;
import java.nio.channels.FileChannel;
public class WriteProverbs {
public static void main(String[] args) {
String dirName = "c:/Beg Java Stuff"; // Directory for the output file
String fileName = "Proverbs.txt"; // Name of the output file
String[] sayings = {
"Indecision maximizes flexibility.",
"Only the mediocre are always at their best.",
"A little knowledge is a dangerous thing.",
"Many a mickle makes a muckle.",
"Who begins too much achieves little.",
"Who knows most says least.",
"A wise man sits on the hole in his carpet."
};
File aFile = new File(dirName, fileName);
FileOutputStream outputFile = null;
try {
outputFile = new FileOutputStream(aFile, true);
} catch (FileNotFoundException e) {
e.printStackTrace(System.err);
System.exit(1);
}
FileChannel outChannel = outputFile.getChannel();
// Create a buffer to accommodate the longest string + its length value
int maxLength = sayings[0].length();
for (int i = 1; i < sayings.length; i++) {
if (maxLength < sayings[i].length())
maxLength = sayings[i].length ();
}
ByteBuffer buf = ByteBuffer.allocate(2 * maxLength + 4);
// Write the file
try {
for (int i = 0; i < sayings.length; i++) {
buf.putInt(sayings[i].length()).asCharBuffer().put(sayings[i]);
buf.position(buf.position() + 2 * sayings[i].length()).flip();
outChannel.write(buf); // Write the buffer to the file channel
buf.clear();
}
outputFile.close(); // Close the output stream & the channel
System.out.println("Proverbs written to file.");