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创建单个“火车票类”

package date0804.demo3;
/**
 * 票
 * @author zzw922cn
 *
 */
public final class Ticket {

	private final String name;

	public Ticket(String name) {
		super();
		this.name = name;
	}
	public String getName() {
		return name;
	}
	
}

火车票DB的构建

采用静态工厂生产火车票的模式：

package date0804.demo3;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.util.ArrayList;

import javax.xml.bind.DatatypeConverter;

public class TicketFactory {
	private ArrayList<Ticket> list = new ArrayList<Ticket>();
	private String str="seed";
	private final int NUMBER_OF_TICKETS=100;
	private TicketFactory() {
		//产生火车票
		for(int count=0;count<NUMBER_OF_TICKETS;count++) {
			InputStream inputStream = new ByteArrayInputStream(str.getBytes());
	        MessageDigest instance;
			try {
				instance = MessageDigest.getInstance("MD2");
				DigestInputStream digestInputStream = new DigestInputStream(inputStream, instance);
				while(digestInputStream.read()!=-1)
				    ;
				digestInputStream.close();
				byte[] digest = instance.digest();
				str=DatatypeConverter.printHexBinary(digest);
				list.add(new Ticket(str));
			}catch(Exception ex) {
				ex.printStackTrace();
			}
		}
	}
	private static TicketFactory ticketFactory=new TicketFactory();
	public static ArrayList<Ticket> getTickets() {
		return ticketFactory.list;
	}
}

火车票的操作与DB的变更

package date0804.demo3;
/**
 * 售票系统
 */
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

/**
 * 多线程模拟火车票售票系统
 * @author zzw922cn
 *
 */
public class TicketOperation {

	private ArrayList<Ticket> list;
	
	public TicketOperation(ArrayList<Ticket> list) {
		this.list=list;
	}
	
	public Map<Integer,Ticket> sell(){
		synchronized (this) {
			HashMap<Integer, Ticket> hashMap=new HashMap<Integer, Ticket>();
			if(list.size()>0) {
				Ticket ticket=list.get(0);
				list.remove(0);
				int size=list.size();
				hashMap.put(size, ticket);
				return hashMap;
			}else {
				return null;
			}
		}
	}
	
}

购票行为线程

package date0804.demo3;
import java.io.File;
/**
 * 买票
 */
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

public class BuyTicketRunnable implements Runnable {

	private TicketOperation ticketDb;
	
	private String content;
	
	File file=new File("ticket.log");
	
	public BuyTicketRunnable(TicketOperation ticketDb) {
		this.ticketDb = ticketDb;
	}

	@Override
	public void run() {
		Map<Integer,Ticket> map=ticketDb.sell();
		if(map!=null) {
			Set<Entry<Integer, Ticket>> entrySet = map.entrySet();
			Iterator<Entry<Integer, Ticket>> iterator2 = entrySet.iterator();
			Entry<Integer, Ticket> next = iterator2.next();
			int size=next.getKey();
			Ticket ticket=next.getValue();
			content="Thread "+Thread.currentThread().getId()+"买了一张票:"+ticket.getName()+
					"剩余票数为"+size;
		}
		else {
			content="Thread "+Thread.currentThread().getId()+"票已售空";
		}
		
		//记录日志
		WritingThread writingThread = new WritingThread(file,content);
		writingThread.start();
	}

}

日志记录

package date0804.demo3;
/**
 * 记录日志
 */
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.Date;

public class LoggingFile {
	private Writer out;

	public LoggingFile(File f) throws IOException {
		FileWriter fileWriter = new FileWriter(f,true);
		//使用缓冲包装写入器，能够增加效率
		this.out = new BufferedWriter(fileWriter);
	}
	
	public void writeLogs(String message) throws IOException {
		synchronized(out) {
			Date d=new Date();
			StringBuilder stringBuilder = new StringBuilder(d.toString());
			stringBuilder.append(‘\t‘);
			stringBuilder.append(message);
			stringBuilder.append("\r\n");
			out.write(stringBuilder.toString());
			System.out.println(stringBuilder.toString());
		}
	}
	
	public void close() throws IOException {
		out.flush();
		out.close();
	}
}

日志的写入线程

package date0804.demo3;
/**
 * 日志写入文件
 */
import java.io.File;
import java.io.IOException;

public class WritingThread extends Thread {
	
	private File logFile;
	private String content;
	public WritingThread(File logFile,String content) {
		this.logFile=logFile;
		this.content=content;
	}
	@Override
	public void run() {
		try {
			LoggingFile loggingFile = new LoggingFile(logFile);
			loggingFile.writeLogs(content);
			loggingFile.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
}

测试类

package date0804.demo3;

import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.concurrent.ExecutionException;


public class Test {
	
	private final static int NUMBER_OF_BUYERS=120;

	public static void main(String[] args) throws InterruptedException, IOException, NoSuchAlgorithmException, ExecutionException {
		
		ArrayList<Ticket> list=TicketFactory.getTickets();
		TicketOperation ticketOperation = new TicketOperation(list);
		BuyTicketRunnable buyTicketThread = new BuyTicketRunnable(ticketOperation);
		
		for(int i=0;i<NUMBER_OF_BUYERS;i++) {
			Thread thread= new Thread(buyTicketThread);
			thread.start();
		}
	}
}

使用Java多线程模简单拟售票系统

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原文地址：http://my.oschina.net/zzw922cn/blog/488453