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                ## 服務器端實現步驟 1. 創建DatagramSocket,指定端口號 2. 創建DatagramPacket,用于接收客戶端的數據 3. 接收客戶端發送的數據信息 4. 讀取數據 ~~~java public class UDPServer { /** * 服務器端,實現基于UDP的用戶登陸 * * @throws IOException */ public static void main(String[] args) throws IOException { /* 服務端接收客戶端的數據 */ // 1. 創建DatagramSocket,指定端口號 DatagramSocket socket = new DatagramSocket(8800); // 2. 創建DatagramPacket,用于接收客戶端的數據 byte[] data = new byte[1024];// 創建字節數組,指定接收的數據包的大小 DatagramPacket packet = new DatagramPacket(data, data.length); // 3. 接收客戶端發送的數據信息 System.out.println("***服務器端啟動***"); socket.receive(packet);// 次方發在接收到數據包之前會一直阻塞 // 4. 讀取數據 String info = new String(data, 0, packet.getLength()); System.out.println("我是服務器,客戶端說:" + info); /* 向客戶端響應數據 */ // 1.定義客戶端的地址、端口號、數據 InetAddress address = packet.getAddress(); int port = packet.getPort(); byte[] data2 = "歡迎你".getBytes(); // 2.創建數據包,包含響應的數據信息 DatagramPacket packet2 = new DatagramPacket(data2, data2.length, address, port); // 3.響應客戶端 socket.send(packet2); // 4.關閉資源 socket.close(); } } ~~~ ## 客戶端實現步驟 1. 定義發送信息,服務器地址,端口號,數據 2. 創建DatagramPacket,包含將要發送的信息 3. 創建DatagramSocket對象 4. 發送數據 ~~~java public class UDPClient { /** * 客戶端 * * @throws IOException */ public static void main(String[] args) throws IOException { /* 向服務器端發送信息 */ // 1. 定義發送信息,服務器地址,端口號,數據 InetAddress address = InetAddress.getByName("localhost"); int port = 8800; byte[] data = "用戶名:admin;密碼:123".getBytes(); // 2. 創建DatagramPacket,包含將要發送的信息 DatagramPacket packet = new DatagramPacket(data, data.length, address, port); // 3. 創建DatagramSocket對象 DatagramSocket socket = new DatagramSocket(); // 4. 發送數據 socket.send(packet); /* 接收服務器端響應的數據 */ // 1.創建數據報,用于接收服務器端響應的數據 byte[] data2 = new byte[1024]; DatagramPacket packet2 = new DatagramPacket(data2, data2.length); // 2.接收服務器響應的數據 socket.receive(packet2); // 3.當前數據 String reply = new String(data2, 0, packet2.getLength()); System.out.println("我是客戶端,服務器說:" + reply); // 4.關閉資源 socket.close(); } } ~~~
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