marketing.java

java nio 编程一个实例子.服务端程序

package com.ronsoft.books.nio.channels;

import java.nio.ByteBuffer;
import java.nio.channels.GatheringByteChannel;
import java.io.FileOutputStream;
import java.util.Random;
import java.util.List;
import java.util.LinkedList;

/**
 * Demonstrate gathering write using many buffers.
 *
 * Created April, 2002
 * @author Ron Hitchens ([e-mail])
 * @version $Id: Marketing.java,v 1.4 2002/05/20 07:24:29 ron Exp $
 */
public class Marketing
{
	private static final String DEMOGRAPHIC = "blahblah.txt";

	// "Leverage frictionless methodologies."
	public static void main (String [] argv)
		throws Exception
	{
		int reps = 10;

		if (argv.length > 0) {
			reps = Integer.parseInt (argv [0]);
		}

		FileOutputStream fos = new FileOutputStream (DEMOGRAPHIC);
		GatheringByteChannel gatherChannel = fos.getChannel();

		// generate some brilliant marcom, er, repurposed content
		ByteBuffer [] bs = utterBS (reps);

		// deliver the message to the waiting market
		while (gatherChannel.write (bs) > 0) {
			// empty body
			// loop until write() returns zero
		}

		System.out.println ("Mindshare paradigms synergized to "
			+ DEMOGRAPHIC);

		fos.close();
	}

	// ------------------------------------------------
	// These are just representative, add your own

	private static String [] col1 = {
		"Aggregate", "Enable", "Leverage",
		"Facilitate", "Synergize", "Repurpose",
		"Strategize", "Reinvent", "Harness"
	};

	private static String [] col2 = {
		"cross-platform", "best-of-breed", "frictionless",
		"ubiquitous", "extensible", "compelling",
		"mission-critical", "collaborative", "integrated"
	};

	private static String [] col3 = {
		"methodologies", "infomediaries", "platforms",
		"schemas", "mindshare", "paradigms",
		"functionalities", "web services", "infrastructures"
	};

	private static String newline = System.getProperty ("line.separator");

	// The Marcom-atic 9000
	private static ByteBuffer [] utterBS (int howMany)
		throws Exception
	{
		List list = new LinkedList();

		for (int i = 0; i < howMany; i++) {
			list.add (pickRandom (col1, " "));
			list.add (pickRandom (col2, " "));
			list.add (pickRandom (col3, newline));
		}

		ByteBuffer [] bufs = new ByteBuffer [list.size()];
		list.toArray (bufs);

		return (bufs);
	}

	// The communications director
	private static Random rand = new Random();

	// Pick one, make a buffer to hold it plus the suffix, load it with
	// the byte equivalent of the strings (will not work properly for
	// non-Latin characters), then flip the loaded buffer so it's ready
	// to be drained.
	private static ByteBuffer pickRandom (String [] strings, String suffix)
		throws Exception
	{
		String string = strings [rand.nextInt (strings.length)];
		int total = string.length() + suffix.length();
		ByteBuffer buf = ByteBuffer.allocate (total);

		buf.put (string.getBytes ("US-ASCII"));
		buf.put (suffix.getBytes ("US-ASCII"));
		buf.flip();

		return (buf);
	}
}