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最新推荐文章于 2025-02-19 20:58:42 发布

原创最新推荐文章于 2025-02-19 20:58:42 发布 · 2.4k 阅读

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文章标签：

#string #thread #socket #server #import #calendar

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本文介绍了一个基于Java实现的简易聊天服务器的设计与实现细节。该服务器能够接收多个客户端连接，并通过广播方式转发消息到所有在线用户。文章展示了如何使用Java Socket API进行网络通信，包括服务器端与客户端的消息收发流程。

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Server:

import java.net.*;

import java.io.*;

import java.util.*;

public class Server extends ServerSocket {

private Socket socket;

private static final int SERVER_PORT = 6789;

private static ArrayList User_List = new ArrayList();

private static ArrayList Threader = new ArrayList();

private static LinkedList Message_Array = new LinkedList();

private static int Thread_Counter = 0;

private static boolean isClear = true;

protected FileOutputStream LOG_FILE = new FileOutputStream("E:/program/connect.log",true);

public Server() throws IOException,FileNotFoundException

{

super(SERVER_PORT);

new Broadcast();

Calendar now = Calendar.getInstance();

String str = "[" + now.getTime().toString() + " ] Accepted a connection1512";

byte[] tmp = str.getBytes();

LOG_FILE.write(tmp);

try

{

while(true)

{

socket = accept();

new CreateServerThread(socket);

}

catch(IOException e)

{}

finally

{

close();

}

class Broadcast extends Thread

{

public Broadcast()

{

start();

}

public void run()

{

while(true)

{

if(!isClear)

{

String tmp = (String)Message_Array.getFirst();

for(int i = 0; i< Threader.size();i++)

{

CreateServerThread client = (CreateServerThread)Threader.get(i);

client.SendMessage(tmp);

}

Message_Array.removeFirst();

isClear = Message_Array.size()>0 ? false:true;

}

class CreateServerThread extends Thread

{

private Socket client;

private BufferedReader in;

private PrintWriter out;

private String username;

public CreateServerThread(Socket s) throws IOException

{

client = s;

in = new BufferedReader(new InputStreamReader(client.getInputStream()));

out = new PrintWriter(client.getOutputStream(),true);

out.println("--Welcome to this chatroom--");

out.println("input your nickname:");

start();

}

public void SendMessage(String msg)

{

out.println(msg);

}

public void run()

{

try

{

int flag = 0;

Thread_Counter++;

String line = in.readLine();

while(!line.equals("bye"))

{

if(line.equals("1"))

{

out.println(ListOnlineUsers());

line = in.readLine();

continue;

}

if(flag++ == 0)

{

username = line;

User_List.add(username);

out.println(ListOnlineUsers());

Threader.add(this);

PushMessage("[< "+username+" come on in >]");

}

else

{

PushMessage("< "+ username + " >" + line);

}

line = in.readLine();

}

out.println("--see you,bye--");

client.close();

}

catch(IOException e)

{}

finally

{

try

{

client.close();

}

catch(IOException e)

{}

Thread_Counter --;

Threader.remove(this);

User_List.remove(username);

PushMessage("[< " + username + " left>]" );

}

private String ListOnlineUsers()

{

String s = "-+- Online list -+-1512";

for (int i = 0 ; i < User_List.size(); i ++)

{

s+="[" + User_List.get(i) + "]1512";

}

s+="-+-----------------------+-";

return s;

}

private void PushMessage(String msg)

{

Message_Array.addLast(msg);

isClear = false;

}

/**

* @param args

public static void main(String[] args) throws IOException {

// TODO Auto-generated method stub

new Server();

}

Client:

same as single client