Question

Java如何使用UDP协议实现多人聊天？

我的代码，有问题，不能实现....

逻辑线程：
public class LogicThread extends Thread {

private DatagramPacket receive;
private boolean bool; //标识是否已经在服务器接收过数据

public LogicThread(DatagramPacket receive){
this.receive = receive;
bool = true;
}

@Override
public void run() {
DatagramSocket server = null;
try {
server = new DatagramSocket();
while(true){
//接收
if (!bool) {
byte[] b = new byte[1024];
DatagramPacket receive = new DatagramPacket(b,b.length);
server.receive(receive);
}
byte[] r = receive.getData();
InetAddress inet = receive.getAddress();
String msg = new String(r,0,receive.getLength());
System.out.println(inet+"客户端："+msg);
if ("bye".equals(msg)) {
System.out.println("服务器关闭....");
break;
}
//发送
System.out.print("输入信息：");
String str = new BufferedReader(new InputStreamReader(System.in)).readLine();
byte[] s = str.getBytes();
DatagramPacket send = new DatagramPacket(s,s.length,inet,receive.getPort());
server.send(send);
bool = false;

服务器：
DatagramSocket server = new DatagramSocket(10000);
System.out.println("*****服务器启动*****");
while(true){
//接收
byte[] b = new byte[1024];
DatagramPacket receive = new DatagramPacket(b,b.length);
server.receive(receive);
count++;
System.out.println("第"+count+"个客户端连接。");
LogicThread lt = new LogicThread(receive);
lt.start();

客户端省略....

Answer 1

UDP 是广播的，如果是做实时的聊天，就开两个线程、不需要服务器端。一个专门接收、一个做发送