使用TCP+多线程编程方式和DataOutputStream，DataInputStream实现基于Java的Scoket编程

Java的Socket编程是基于TCP协议的，使用TCP多线程编程方式可以实现并发处理多个客户端请求，提高系统的并发处理能力。

以下是使用TCP多线程编程方式和DataOutputStream，DataInputStream实现基于Java的Socket编程的代码示例：

服务端代码：

import java.io.*;
import java.net.*;

public class Server {
    public static void main(String[] args) throws Exception {
        ServerSocket serverSocket = new ServerSocket(1234);
        System.out.println("Server started");

        while (true) {
            Socket socket = serverSocket.accept();
            System.out.println("Client connected: " + socket);

            Thread t = new Thread(new ClientHandler(socket));
            t.start();
        }
    }
}

class ClientHandler implements Runnable {
    private Socket socket;
    private DataOutputStream out;
    private DataInputStream in;

    public ClientHandler(Socket socket) throws IOException {
        this.socket = socket;
        out = new DataOutputStream(socket.getOutputStream());
        in = new DataInputStream(socket.getInputStream());
    }

    public void run() {
        try {
            while (true) {
                String message = in.readUTF();
                System.out.println("Received from client: " + message);
                out.writeUTF("Server response: " + message);
            }
        } catch (IOException e) {
            System.out.println("Client disconnected: " + socket);
        } finally {
            try {
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

客户端代码：

import java.io.*;
import java.net.*;

public class Client {
    public static void main(String[] args) throws Exception {
        Socket socket = new Socket("localhost", 1234);
        System.out.println("Connected to server: " + socket);

        DataOutputStream out = new DataOutputStream(socket.getOutputStream());
        DataInputStream in = new DataInputStream(socket.getInputStream());

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        while (true) {
            System.out.print("Enter message to send to server: ");
            String message = br.readLine();
            out.writeUTF(message);
            String response = in.readUTF();
            System.out.println("Received from server: " + response);
        }
    }
}

以上代码实现了简单的客户端与服务端之间的通信，服务端接收到客户端发送的消息后，返回一个响应消息给客户端。使用多线程编程方式可以支持并发处理多个客户端请求，并提高系统的并发处理能力。