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(wù)器，客戶端說："+info);
		//響應(yīng)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(wù)器端，實現(xiàn)基于UDP的用戶登陸
?*/
public?class?UDPServer?{

	public?static?void?main(String[]?args)?throws?IOException?{
		//創(chuàng)建服務(wù)器端DatagramSocket，指定端口號
		DatagramSocket?socket?=?new?DatagramSocket(8800);
		byte[]?data?=?new?byte[1024];//創(chuàng)建字節(jié)數(shù)組，指定接收的數(shù)據(jù)報的大小
		int?count=0;
		System.out.println("*******服務(wù)器端已經(jīng)啟動，等待客戶端發(fā)送數(shù)據(jù)**********");
		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(shù)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(fā)送到服務(wù)器的數(shù)據(jù)信息

*/

int count = 0;

//創(chuàng)建DatagramSocket,指定端口

socket = new DatagramSocket(8800);

while(true){

//創(chuàng)建DatagramPacket,用于存儲客戶端發(fā)送的信息

byte[] data = new byte[1024];

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

//接受從客戶端發(fā)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(wù)端，客戶端說："+info);

/*?

?* 對客戶端的請求進行響應(yīng)

?*/

?

//獲取客戶端主機信息和定義要響應(yīng)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(yīng)信息

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

//發(fā)送響應(yīng)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(fā)一下源代碼參考一下？

感覺因為現(xiàn)在人數(shù)多了還是怎么的，幕課網(wǎng)現(xiàn)在都已經(jīng)沒老師來回答問題了，以前的時候人發(fā)問題總有。唉，現(xiàn)在就只剩些學生互相猜解了。

額，我已經(jīng)找到答案了，udp的datagrampacket接受數(shù)據(jù)只能用一個線程接收。所以要先接受后將數(shù)據(jù)提交線程池處理即可

同問！