请问在JAVA中做broadcast用什么函数？

Question

请问在JAVA中做broadcast用什么函数？

Answer 1

大致上和这两个类有关。
java.net.DatagramSocket
java.net.DatagramPacketThinkInJava中有介绍

Answer 2

tij的例子//ChatterServer.javaimport java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
import java.io.IOException;public class ChatterServer {
    static final int INPORT = 1711;
    private byte[] buf = new byte[1000];
    private DatagramPacket dp = 
        new DatagramPacket(buf, buf.length);
    private DatagramSocket socket;    public ChatterServer() {
        try {
            socket = new DatagramSocket(INPORT);
            System.out.println("Server started.");            while (true) {
                socket.receive(dp);                String rcvd = Dgram.toString(dp)
                    + ", from address: " + dp.getAddress()
                    + ", port: " + dp.getPort();                System.out.println(rcvd);
                String echoString = "Echoed: " + rcvd;                DatagramPacket echo =
                    Dgram.toDatagram(echoString, dp.getAddress(), dp.getPort());                socket.send(echo);
            }
        } catch (SocketException e) {
            System.err.println("Can't open socket");
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Communication error.");
            e.printStackTrace();
        }
    }    public static void main(String[] args) {
        new ChatterServer();
    }
}
// ChatterClient.javaimport java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;import java.net.UnknownHostException;
import java.io.IOException;public class ChatterClient 
    extends Thread {    private DatagramSocket socket;
    private InetAddress hostAddr;
    private byte[] buf = new byte[1000];
    private DatagramPacket dp = 
        new DatagramPacket(buf, buf.length);
    private int id;    public ChatterClient(int identifier) {
        id = identifier;
        try {
            socket = new DatagramSocket();
            hostAddr = InetAddress.getByName("localhost");
        } catch (UnknownHostException e) {
            System.err.println("Can't find host");
            System.exit(1);
        } catch (SocketException e) {
            System.err.println("Can't open socket.");
            e.printStackTrace();
            System.exit(1);
        }
        System.out.println("ChatterClient starting.");
    }    public void run() {
        try {
            for (int i=0; i<25; i++) {
                String outMessage = "Client #"
                    + id + ", message #" + i;                System.out.println("Message will be sent is: \"" 
                    + outMessage + "\".");                socket.send(Dgram.toDatagram(outMessage, 
                    hostAddr, 
                    ChatterServer.INPORT));                socket.receive(dp);                String rcvd = "Client #" + id +
                    ", rcvd from " +
                    dp.getAddress() + ", " +
                    dp.getPort() + ": " +
                    Dgram.toString(dp);
                System.out.println(rcvd);
            }
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(1);
        }
    }    public static void main(String[] args) {
        for (int i=0; i<10; i++) {
            new ChatterClient(i).start();
        }
    }
}