【发布时间】：2020-11-04 06:58:40
【问题描述】：
import java.net.*;
import java.io.*;
import java.util.*;
public class GroupChat
{
private static final String TERMINATE = "Exit";
static String name;
static volatile boolean finished = false;
public static void main(String[] args)
{
if (args.length != 2)
System.out.println("Two arguments required: <multicast-host> <port-number>");
else
{
try
{
InetAddress group = InetAddress.getByName(args[0]);
int port = Integer.parseInt(args[1]);
Scanner sc = new Scanner(System.in);
System.out.print("Enter your name: ");
name = sc.nextLine();
MulticastSocket socket = new MulticastSocket(port);
// Since we are deploying
socket.setTimeToLive(0);
//this on localhost only (For a subnet set it as 1)
socket.joinGroup(group);
Thread t = new Thread(new
ReadThread(socket,group,port));
// Spawn a thread for reading messages
t.start();
// sent to the current group
System.out.println("Start typing messages...\n");
while(true)
{
String message;
message = sc.nextLine();
if(message.equalsIgnoreCase(GroupChat.TERMINATE))
{
finished = true;
socket.leaveGroup(group);
socket.close();
break;
}
message = name + ": " + message;
byte[] buffer = message.getBytes();
DatagramPacket datagram = new
DatagramPacket(buffer,buffer.length,group,port);
socket.send(datagram);
}
}
catch(SocketException se)
{
System.out.println("Error creating socket");
se.printStackTrace();
}
catch(IOException ie)
{
System.out.println("Error reading/writing from/to socket");
ie.printStackTrace();
}
}
}
}
class ReadThread implements Runnable
{
private MulticastSocket socket;
private InetAddress group;
private int port;
private static final int MAX_LEN = 1000;
ReadThread(MulticastSocket socket,InetAddress group,int port)
{
this.socket = socket;
this.group = group;
this.port = port;
}
@Override
public void run()
{
while(!GroupChat.finished)
{
byte[] buffer = new byte[ReadThread.MAX_LEN];
DatagramPacket datagram = new
DatagramPacket(buffer,buffer.length,group,port);
String message;
try
{
socket.receive(datagram);
message = new
String(buffer,0,datagram.getLength(),"UTF-8");
if(!message.startsWith(GroupChat.name))
System.out.println(message);
}
catch(IOException e)
{
System.out.println("Socket closed!");
}
}
}
}
是否可以在同一网络的两台计算机上运行此代码？我已经尝试过，但它似乎只有在同一台计算机上才能工作。网络是否存在问题，或者代码是否无法传递到网络中的不同计算机。顺便说一句，这不是我的代码，我是出于学习目的从互联网上获取的。提前非常感谢。
【问题讨论】：
-
“仅似乎有效”究竟是什么意思？
-
你尝试使用我的代码吗？
-
我编辑了我的答案，让你也能看到我的服务器站点代码。
标签： java multithreading sockets networking server