java实现socket连接池

Java实现socket连接池，可以通过自定义连接池类来实现。下面是一个简单的示例：

import java.io.IOException;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;

public class SocketPool {
    private static final int DEFAULT_POOL_SIZE = 10;
    private List<Socket> sockets;

    public SocketPool(int poolSize) {
        sockets = new ArrayList<>(poolSize);
        for (int i = 0; i < poolSize; i++) {
            try {
                sockets.add(new Socket("localhost", 8080));
            } catch (IOException e) {
                System.err.println("Failed to create socket.");
            }
        }
    }

    public SocketPool() {
        this(DEFAULT_POOL_SIZE);
    }

    public synchronized Socket getSocket() {
        while (sockets.isEmpty()) {
            try {
                wait();
            } catch (InterruptedException e) {
                System.err.println("Interrupted while waiting for socket.");
            }
        }
        return sockets.remove(sockets.size() - 1);
    }

    public synchronized void returnSocket(Socket socket) {
        sockets.add(socket);
        notifyAll();
    }

    public synchronized void closeAll() {
        for (Socket socket : sockets) {
            try {
                socket.close();
            } catch (IOException e) {
                System.err.println("Failed to close socket.");
            }
        }
        sockets.clear();
    }
}

该连接池类通过List来维护一组Socket对象，构造函数中创建指定数量的Socket对象并加入List中。getSocket方法用于从连接池中获取一个Socket对象，如果连接池为空则等待；returnSocket方法用于将一个Socket对象归还给连接池；closeAll方法用于关闭所有连接池中的Socket对象。