我正在实现一个多播服务器,它将其 IP 发送到多播组,并且组中的客户端在收到服务器的 IP 后,向它发送一个对象。这是定期进行的。
因此,第一个连接是一对多,第二个是一对一。我已经实现了各个部分,即多播,正确地通过套接字发送对象,但是当我整体运行它时遇到错误。
下面是代码: MulticastServer:
public class MulticastServer {
public static void main(String[] args) throws java.io.IOException {
new MulticastServerThread().start();
}
}
组播服务器线程:
public class MulticastServerThread extends QuoteServerThread {
public void run() {
while (true) {
try {
byte[] buf = new byte[256];
// construct quote
String dString = InetAddress.getLocalHost().toString();
buf = dString.getBytes();
InetAddress group = InetAddress.getByName("230.0.0.1");
DatagramPacket packet = new DatagramPacket(buf, buf.length,
group, 4446);
// server join group。
socket.send(packet);
// sleep for a while
try {
sleep((long)(Math.random() * FIVE_SECONDS));
} catch (InterruptedException e) { }
} catch (IOException e) {
e.printStackTrace();
moreQuotes = false;
}
}
socket.close();
//Sending the object
try {
ServerSocket ss = new ServerSocket(port);
Socket s = ss.accept();
InputStream is = s.getInputStream();
ObjectInputStream ois = new ObjectInputStream(is);
Object to = (Object)ois.readObject();
if (to!=null){System.out.println(to.a);}
System.out.println((String)ois.readObject());
is.close();
s.close();
ss.close();
}catch(Exception e){System.out.println(e);}
}
}
报价服务器线程:
public class QuoteServerThread extends Thread {
protected DatagramSocket socket = null;
protected BufferedReader in = null;
protected boolean moreQuotes = true;
private static int TTL = 128;
int port=2002;
//Code which returns the IP of the server
}
}
在客户端:MulticastClient:
public class MulticastClient {
public static void main(String[] args) throws IOException {
MulticastSocket socket = new MulticastSocket(4446);
InetAddress address = InetAddress.getByName("230.0.0.1");
socket.joinGroup(address);
DatagramPacket packet;
// get a few quotes
boolean Condition=true;
while(Condition) {
byte[] buf = new byte[256];
packet = new DatagramPacket(buf, buf.length);
socket.receive(packet);
String received = new String(packet.getData());
System.out.println("IP of controller" + received);
Socket s=new Socket("localhost",2002);
ObjectOutputStream os=(ObjectOutputStream) s.getOutputStream();
ObjectOutputStream oos=new ObjectOutputStream(os);
Object to=new Object();
oos.writeObject(to);
oos.writeObject(new String("another object from client"));
oos.close();
os.close();
s.close();
}
socket.leaveGroup(address);
socket.close();
}
我在线程“main”java.net.ConnectException 中遇到异常:客户端的 java.net.PlainSocketImpl.socketConnect(Native Method) 连接被拒绝,它指向客户端的套接字创建。
有人可以帮帮我吗?谢谢!