jdk6.0从入门到精通-----chapter5网络编程 tcp连接池-优快云博客

本文介绍了一个简单的连接池实现，包括连接的获取、释放和重建过程。该连接池支持固定数量的连接，并通过状态数组来标记每个连接是否被占用。

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package pool;

import java.net.Socket;
import java.util.Hashtable;

public class ConnectionPool {
	private static final int CONNECTION_POOL_SIZE = 10;
	private static final String API_SERVER_HOST = "127.0.0.01";
	private static final int API_SERVER_PORT = 80;

	private static ConnectionPool self = null;// ConnectionPool的唯一实例

	private Hashtable socketPool = null;// 连接池
	private boolean[] socketStatusArray = null;// 连接的状态（true-被占用；false-空闲）

	public static synchronized void init() {
		self = new ConnectionPool();
		self.socketPool = new Hashtable();
		self.socketStatusArray = new boolean[CONNECTION_POOL_SIZE];

		// 初始化连接池
		self.buildConnectionPool();
	}

	public static synchronized void reset() {
		self = null;
		init();
	}

	public static Socket getConnection() {
		if (self == null)
			init();

		int i = 0;
		for (i = 0; i < CONNECTION_POOL_SIZE; i++) {
			if (!self.socketStatusArray[i]) {
				self.socketStatusArray[i] = true;
				break;
			}
		}
		if (i <= CONNECTION_POOL_SIZE)
			return (Socket) self.socketPool.get(new Integer(i));
		else {
			System.out.println("从连接池中获取与邮局的连接失败，已经没有空闲连接！");
			throw new RuntimeException("No enough pooled connections.");
		}
	}

	public static void releaseConnection(Socket socket) {
		if (self == null)
			init();

		for (int i = 0; i < CONNECTION_POOL_SIZE; i++) {
			if (((Socket) self.socketPool.get(new Integer(i))) == socket) {
				self.socketStatusArray[i] = false;
				break;
			}
		}
	}

	public static Socket rebuildConnection(Socket socket) {
		if (self == null)
			init();

		Socket newSocket = null;
		for (int i = 0; i < CONNECTION_POOL_SIZE; i++) {
			try {
				if (((Socket) self.socketPool.get(new Integer(i))) == socket) {
					System.out.println("重建连接池中的第" + i + "个连接.");
					newSocket = new Socket(API_SERVER_HOST, API_SERVER_PORT);
					self.socketPool.put(new Integer(i), newSocket);
					self.socketStatusArray[i] = true;
					break;
				}
			} catch (Exception e) {
				System.out.println("重建连接失败！");
				throw new RuntimeException(e);
			}
		}
		return newSocket;
	}

	public synchronized static void buildConnectionPool() {
		if (self == null)
			init();

		System.out.println("准备建立连接池.");
		Socket socket = null;
		try {
			for (int i = 0; i < CONNECTION_POOL_SIZE; i++) {
				socket = new Socket(API_SERVER_HOST, API_SERVER_PORT);
				self.socketPool.put(new Integer(i), socket);
				self.socketStatusArray[i] = false;
			}
		} catch (Exception e) {
			System.out.println("与邮局的连接池建立失败！");
			throw new RuntimeException(e);
		}
	}

	public synchronized static void releaseAllConnection() {
		if (self == null)
			init();

		// 关闭所有连接
		Socket socket = null;
		for (int i = 0; i < CONNECTION_POOL_SIZE; i++) {
			socket = (Socket) self.socketPool.get(new Integer(i));
			try {
				socket.close();
			} catch (Exception e) {
			}
		}
	}
}