服务端
package work;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.util.ArrayList;
import java.util.List;
public class UDPServer {
private static final int PORT = 9876;
private static List<ClientInfo> clients = new ArrayList<>();
public static void main(String[] args) {
try {
DatagramSocket socket = new DatagramSocket(PORT);
System.out.println("UDP 服务器在端口上运行 " + PORT);
while (true) {
byte[] receiveData = new byte[1024];
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
socket.receive(receivePacket);
String message = new String(receivePacket.getData(), 0, receivePacket.getLength());
System.out.println("收到来自 " + receivePacket.getAddress() + ": " + message);
// Broadcast message to all clients
broadcastMessage(message, receivePacket.getAddress(), receivePacket.getPort());
}
} catch (Exception e) {
e.printStackTrace();
}
}
private static void broadcastMessage(String message, java.net.InetAddress address, int port) {
for (ClientInfo client : clients) {
try {
DatagramSocket clientSocket = new DatagramSocket();
byte[] sendData = message.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, client.getAddress(), client.getPort());
clientSocket.send(sendPacket);
clientSocket.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
private static class ClientInfo {
private java.net.InetAddress address;
private int port;
public ClientInfo(java.net.InetAddress address, int port) {
this.address = address;
this.port = port;
}
public java.net.InetAddress getAddress() {
return address;
}
public int getPort() {
return port;
}
}
}
客服端口
package work;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
public class TCPClient {
public static void main(String[] args) {
final String serverAddress = "localhost";
final int serverPort = 12345;
try (Socket socket = new Socket(serverAddress, serverPort)) {
BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter writer = new PrintWriter(socket.getOutputStream(), true);
// 从服务器接收消息并显示
new Thread(() -> {
try {
String message;
while ((message = reader.readLine()) != null) {
System.out.println("服务器: " + message);
}
} catch (IOException e) {
e.printStackTrace();
}
}).start();
// 从控制台读取输入并发送给服务器
BufferedReader consoleReader = new BufferedReader(new InputStreamReader(System.in));
String consoleInput;
while ((consoleInput = consoleReader.readLine()) != null) {
writer.println(consoleInput);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
结果：
UDP
客户端
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.util.ArrayList;
import java.util.List;
public class UDPServer {
private static final int PORT = 9876;
private static List<ClientInfo> clients = new ArrayList<>();
public static void main(String[] args) {
try {
DatagramSocket socket = new DatagramSocket(PORT);
System.out.println("UDP Server is running on port " + PORT);
while (true) {
byte[] receiveData = new byte[1024];
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
socket.receive(receivePacket);
String message = new String(receivePacket.getData(), 0, receivePacket.getLength());
System.out.println("Received from " + receivePacket.getAddress() + ": " + message);
// Broadcast message to all clients
broadcastMessage(message, receivePacket.getAddress(), receivePacket.getPort());
}
} catch (Exception e) {
e.printStackTrace();
}
}
private static void broadcastMessage(String message, java.net.InetAddress address, int port) {
for (ClientInfo client : clients) {
try {
DatagramSocket clientSocket = new DatagramSocket();
byte[] sendData = message.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, client.getAddress(), client.getPort());
clientSocket.send(sendPacket);
clientSocket.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
private static class ClientInfo {
private java.net.InetAddress address;
private int port;
public ClientInfo(java.net.InetAddress address, int port) {
this.address = address;
this.port = port;
}
public java.net.InetAddress getAddress() {
return address;
}
public int getPort() {
return port;
}
}
}
服务端
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.Scanner;
public class UDPClient {
private static final int PORT = 9876;
public static void main(String[] args) {
try {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter your name: ");
String name = scanner.nextLine();
DatagramSocket socket = new DatagramSocket();
InetAddress serverAddress = InetAddress.getByName("localhost");
Thread receiveThread = new Thread(() -> {
try {
byte[] receiveData = new byte[1024];
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
while (true) {
socket.receive(receivePacket);
String message = new String(receivePacket.getData(), 0, receivePacket.getLength());
System.out.println(message);
}
} catch (Exception e) {
e.printStackTrace();
}
});
receiveThread.start();
while (true) {
String message = scanner.nextLine();
String formattedMessage = name + ": " + message;
byte[] sendData = formattedMessage.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, serverAddress, PORT);
socket.send(sendPacket);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
