public?class?UDPServerThread?extends?Thread?{
	DatagramSocket?socket?=?null;
	DatagramPacket?packet?=?null;
	public?UDPServerThread(DatagramPacket?packet,DatagramSocket?socket){
		this.packet?=?packet;
		this.socket?=?socket;
	}
	public?void?run(){
		byte[]?data?=?packet.getData();
		String?info?=?new?String(data,0,packet.getLength());
		System.out.println("我是服務器，客戶端說："+info);
		//響應客戶端
		InetAddress?address?=?packet.getAddress();
		int?port?=?packet.getPort();
		byte[]?data2?=?"歡迎您！".getBytes();
		DatagramPacket?packet2?=?new?DatagramPacket(data2,?data2.length,address,?port);
		try?{
			socket.send(packet2);
		}?catch?(IOException?e)?{
			e.printStackTrace();
		}
	}
}
/*
?*?服務器端，實現基于UDP的用戶登陸
?*/
public?class?UDPServer?{

	public?static?void?main(String[]?args)?throws?IOException?{
		//創建服務器端DatagramSocket，指定端口號
		DatagramSocket?socket?=?new?DatagramSocket(8800);
		byte[]?data?=?new?byte[1024];//創建字節數組，指定接收的數據報的大小
		int?count=0;
		System.out.println("*******服務器端已經啟動，等待客戶端發送數據**********");
		while(true){
			DatagramPacket?packet?=?new?DatagramPacket(data,?data.length);
			socket.receive(packet);
			UDPServerThread?serverThread?=?new?UDPServerThread(packet,?socket);
			serverThread.start();
			count++;
			System.out.println("客戶端的數量是"+count);
		}
	}
}

僅供參考：

public class UdpSocketMilServerDemo {

public static void main(String[] args) {

DatagramSocket socket = null;

try {

/*

* 接受客戶端發送到服務器的數據信息

*/

int count = 0;

//創建DatagramSocket,指定端口

socket = new DatagramSocket(8800);

while(true){

//創建DatagramPacket,用于存儲客戶端發送的信息

byte[] data = new byte[1024];

DatagramPacket packet = new DatagramPacket(data, data.length);

//接受從客戶端發送來的請求信息，并存儲在DatagramPacket中

socket.receive(packet);

UdpThread thread = new UdpThread(socket, data, packet);

thread.start();

count++;

System.out.println("總共有"+count+"個用戶登錄");

}

} catch (SocketException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}finally{

socket.close();

}

}

}

public class UdpThread extends Thread {

private DatagramSocket socket;

private byte[] data;

private DatagramPacket packet;

public UdpThread(DatagramSocket socket,byte[] data,DatagramPacket packet){

this.socket = socket;

this.data = data;

this.packet = packet;

}

@Override

public void run() {

try {

//讀取獲取到的客戶信息

String info = new String(data, 0, packet.getLength());

System.out.println("我是服務端，客戶端說："+info);

/*?

?* 對客戶端的請求進行響應

?*/

?

//獲取客戶端主機信息和定義要響應的信息

InetAddress address = packet.getAddress();

int port = packet.getPort();

byte[] data2 = "歡迎您！".getBytes();

//定義一個DatagramPaket,用戶存放響應信息

DatagramPacket responsePacket = new DatagramPacket(data2, data2.length, address, port);

//發送響應信息

socket.send(responsePacket);

} catch (IOException e) {

e.printStackTrace();

}

}

}

我的也不行，運行不出來。有沒有源代碼參考一下

可以發一下源代碼參考一下？

感覺因為現在人數多了還是怎么的，幕課網現在都已經沒老師來回答問題了，以前的時候人發問題總有。唉，現在就只剩些學生互相猜解了。

額，我已經找到答案了，udp的datagrampacket接受數據只能用一個線程接收。所以要先接受后將數據提交線程池處理即可

同問！