JavaTCP协议实现一对一聊天与UDP协议实现群聊案例
1.TCP协议实现一对一聊天
1.1服务端运行结果
1.2客服端运行结果
1.3代码汇总
服务端
package twentyone;import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;public class Server {public static void main(String[] args) {try {ServerSocket serverSocket = new ServerSocket(12345); // 使用端口12345System.out.println("等待客户端连接...");Socket clientSocket = serverSocket.accept(); // 等待客户端连接System.out.println("客户端已连接");// 获取输入输出流BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);// 读取客户端消息并回复String clientMessage;while ((clientMessage = in.readLine()) != null) {System.out.println("张超（客户端）: " + clientMessage);// 从控制台读取服务器消息并发送给客户端BufferedReader consoleReader = new BufferedReader(new InputStreamReader(System.in));System.out.print(" 蒂蒂（服务器）: ");String serverMessage = consoleReader.readLine();out.println(serverMessage);}} catch (IOException e) {e.printStackTrace();}}
}
客户端
package twentyone;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;public class Client {public static void main(String[] args) {try {Socket socket = new Socket("localhost", 12345); // 连接服务器// 获取输入输出流BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));PrintWriter out = new PrintWriter(socket.getOutputStream(), true);// 从控制台读取客户端消息并发送给服务器BufferedReader consoleReader = new BufferedReader(new InputStreamReader(System.in));String clientMessage;while (true) {System.out.print("张超（客户端）: ");clientMessage = consoleReader.readLine();out.println(clientMessage);// 读取服务器消息并打印String serverMessage = in.readLine();System.out.println("蒂蒂（服务器）" + serverMessage);}} catch (IOException e) {e.printStackTrace();}}
}
2.UDP协议实现群聊
2.1服务端运行结果
2.2客户端运行结果
2.3代码汇总
第一服务端
package twentyone;import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;public class UDPServer {public static void main(String[] args) {try {DatagramSocket serverSocket = new DatagramSocket(12345);System.out.println("第一个服务器已启动，等待客户端加入...");while (true) {byte[] receiveData = new byte[1024];// 接收客户端消息DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);serverSocket.receive(receivePacket);String clientMessage = new String(receivePacket.getData(), 0, receivePacket.getLength());System.out.println("第一个服务器收到来自 " + receivePacket.getAddress() + ":" + receivePacket.getPort() + " 的消息: " + clientMessage);// 广播消息给其他客户端broadcastMessage(serverSocket, clientMessage, receivePacket.getAddress(), receivePacket.getPort());}} catch (Exception e) {e.printStackTrace();}}private static void broadcastMessage(DatagramSocket serverSocket, String message, InetAddress excludeAddress, int excludePort) {try {byte[] sendData = message.getBytes();// 获取广播地址InetAddress broadcastAddress = InetAddress.getByName("255.255.255.255");int broadcastPort = 12345;// 广播消息给所有客户端，除了发起广播的客户端DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, broadcastAddress, broadcastPort);serverSocket.send(sendPacket);} catch (Exception e) {e.printStackTrace();}}
}
第二服务端
package twentyone;import java.net.DatagramPacket;
import java.net.DatagramSocket;public class SecondUDPServer {public static void main(String[] args) {try {DatagramSocket serverSocket = new DatagramSocket(12346);System.out.println("第二个服务器已启动，等待客户端加入...");while (true) {byte[] receiveData = new byte[1024];// 接收客户端消息DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);serverSocket.receive(receivePacket);String clientMessage = new String(receivePacket.getData(), 0, receivePacket.getLength());System.out.println("第二个服务器收到来自 " + receivePacket.getAddress() + ":" + receivePacket.getPort() + " 的消息: " + clientMessage);}} catch (Exception e) {e.printStackTrace();}}
}
客户端
package twentyone;import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;class ConsoleHelper {private static final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));public static String readLine(String prompt) {try {System.out.print(prompt);return reader.readLine();} catch (IOException e) {throw new RuntimeException("Error reading from console", e);}}
}public class UDPClient {public static void main(String[] args) {try {DatagramSocket clientSocket = new DatagramSocket(); // 随机分配端口// 启动接收线程new Thread(() -> receiveMessages(clientSocket, 3)).start();while (true) {// 从控制台读取消息并发送给服务端1和服务端2String message = ConsoleHelper.readLine("客户端: ");byte[] sendData = message.getBytes();// 发送消息给服务端1DatagramPacket sendPacket1 = new DatagramPacket(sendData, sendData.length, InetAddress.getByName("localhost"), 12345);clientSocket.send(sendPacket1);// 发送消息给服务端2DatagramPacket sendPacket2 = new DatagramPacket(sendData, sendData.length, InetAddress.getByName("localhost"), 12346);clientSocket.send(sendPacket2);}} catch (Exception e) {e.printStackTrace();}}private static void receiveMessages(DatagramSocket clientSocket, int maxReceiveCount) {try {byte[] receiveData = new byte[1024];int receiveCount = 0;while (receiveCount < maxReceiveCount) {// 接收服务器广播消息DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);clientSocket.receive(receivePacket);String serverMessage = new String(receivePacket.getData(), 0, receivePacket.getLength());System.out.println("服务器: " + serverMessage);receiveCount++;}} catch (Exception e) {e.printStackTrace();}}
}
