socket通信编程代码java

Socket编程是一种基于TCP/IP协议的网络编程，它是实现网络通信的一种方式。在Java中，Socket编程可以使用Java的标准库java.net包来实现。下面是一个简单的Socket通信的代码示例：

服务端代码：

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

public class Server {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(12345);
        } catch (IOException e) {
            System.err.println("Could not listen on port: 12345.");
            System.exit(1);
        }

        Socket clientSocket = null;
        try {
            System.out.println("Waiting for connection.....");
            clientSocket = serverSocket.accept();
            System.out.println("Accepted connection : " + clientSocket);
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        }

        BufferedReader in = new BufferedReader(
                new InputStreamReader(clientSocket.getInputStream()));
        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(),
                true);

        String inputLine, outputLine;
        while ((inputLine = in.readLine()) != null) {
            System.out.println("Server: " + inputLine);
            out.println(inputLine);

            if (inputLine.equals("Bye.")) {
                break;
            }
        }

        out.close();
        in.close();
        clientSocket.close();
        serverSocket.close();
    }
}

客户端代码：

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

public class Client {
    public static void main(String[] args) throws IOException {

        Socket socket = null;
        PrintWriter out = null;
        BufferedReader in = null;

        try {
            socket = new Socket("localhost", 12345);
            out = new PrintWriter(socket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(
                    socket.getInputStream()));
        } catch (UnknownHostException e) {
            System.err.println("Don't know about host: localhost.");
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for "
                    + "the connection to: localhost.");
            System.exit(1);
        }

        BufferedReader stdIn = new BufferedReader(
                new InputStreamReader(System.in));
        String userInput;

        while ((userInput = stdIn.readLine()) != null) {
            out.println(userInput);
            System.out.println("Client: " + userInput);
            System.out.println("Server: " + in.readLine());

            if (userInput.equals("Bye.")) {
                break;
            }
        }

        out.close();
        in.close();
        stdIn.close();
        socket.close();
    }
}

以上代码实现了一个简单的客户端和服务端之间的通信。运行服务端程序后，再运行客户端程序，输入内容并回车，即可在客户端和服务端之间实现通信。