Java网络通信实现

UDP

UDPServer

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;public class UDPServer {public static void main(String[] args) throws IOException {System.out.println("UdpServer启动");// 创建upd套接字DatagramSocket socket = new DatagramSocket(8080);// 获取客户端连接byte[] buffer = new byte[1024];while (true) {// 获取客户端请求DatagramPacket client = new DatagramPacket(buffer, buffer.length);socket.receive(client);String request = new String(client.getData(), 0, client.getLength());// 回显客户端String response = request;socket.send(new DatagramPacket(response.getBytes(), response.getBytes().length,client.getAddress(), client.getPort()));// 打印交互日志System.out.printf("客户端[%s:%d] receive-> %s send-> %s\n", client.getAddress().toString(),client.getPort(), request, response);}}
}

UDPClient

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.Scanner;public class UDPClient {public static void main(String[] args) throws IOException {System.out.println("UdpClient启动");// 创建客户端套接字DatagramSocket socket = new DatagramSocket();// 创建数据报byte[] buffer = new byte[1024];DatagramPacket client = new DatagramPacket(buffer, buffer.length,InetAddress.getByName("127.0.0.1"), 8080);while (true) {// 获取发送数据System.out.print("send -> ");Scanner scanner = new Scanner(System.in);String request = scanner.next();client.setData(request.getBytes());// 发送数据socket.send(client);// 获取服务器回显数据DatagramPacket server = new DatagramPacket(buffer, buffer.length);socket.receive(server);// 打印交互日志System.out.printf("receive ->[%s:%d] %s\n", server.getAddress().toString(), server.getPort(),new String(server.getData(), 0, server.getLength()));}}
}

测试结果

TCP

TCPServer

import java.io.IOException;
import java.io.PrintStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;public class TCPServer {public static void main(String[] args) throws IOException {System.out.println("TCPServer启动");// 创建监听套接字ServerSocket listenSocket = new ServerSocket(8080, 20, InetAddress.getByName("127.0.0.1"));// 创建线程池处理客户端数据ExecutorService clientPool = Executors.newCachedThreadPool();while (true) {// 获取客户端连接Socket client = listenSocket.accept();// 客户端处理clientPool.submit(() -> {try {clientProcess(client);} catch (IOException e) {e.printStackTrace();}});}}public static void clientProcess(Socket client) throws IOException {System.out.printf("client[%s:%d] connect success\n",client.getInetAddress().toString(), client.getPort());// 处理客户端数据try (Scanner input = new Scanner(client.getInputStream());PrintStream output = new PrintStream(client.getOutputStream())) {while (true) {if (!input.hasNext()) {System.out.printf("client[%s:%d] disconnect\n",client.getInetAddress().toString(), client.getPort());} else {// 约定以\n为一个完整报文String request = input.nextLine();// 回显客户端String response = request;output.println(response);output.flush();// 打印交互日志System.out.printf("client[%s:%d] receive -> %s send -> %s\n",client.getInetAddress().toString(), client.getPort(), request, response);}}}}
}

TCPClient

import java.io.IOException;
import java.io.PrintStream;
import java.net.Socket;
import java.util.Scanner;public class TCPClient {public static void main(String[] args) throws IOException {System.out.println("TCPClient启动");// 创建客户端连接Socket socket = new Socket("127.0.0.1", 8080);Scanner scanner = new Scanner(System.in);try (Scanner input = new Scanner(socket.getInputStream());PrintStream output = new PrintStream(socket.getOutputStream())) {while (true) {System.out.print("send -> ");String request = scanner.nextLine();// 发送请求数据output.println(request);// 获取服务器回显数据String response = input.nextLine();// 打印交互日志System.out.printf("receive -> server[%s:%d] %s\n",socket.getInetAddress().toString(), socket.getPort(), response);}}}
}