我發現了一個聊天服務器的代碼,我有一個簡短的問題。這是關於以下摘錄:從聊天服務器發送到聊天客戶端的數組更新
clientOutputStreams.add(作家);
顯然,這種字符串數組應該被髮送到聊天客戶端,但我不明白怎麼陣列不斷被更新 - 即如何發送到由特殊的聊天客戶端的服務器字符串數組中accumualated然後送回給所有聊天客戶。你做?將不勝感激你的幫助。
import java.io.*;
import java.net.*;
import java.util.*;
public class VerySimpleChatServer {
ArrayList clientOutputStreams;
public class ClientHandler implements Runnable {
BufferedReader reader;
Socket sock;
public ClientHandler(Socket clientSOcket) {
try {
sock = clientSOcket;
InputStreamReader isReader = new InputStreamReader(sock.getInputStream());
reader = new BufferedReader(isReader);
} catch (Exception ex) { ex.printStackTrace(); }
}
public void run() {
String message;
try {
while ((message = reader.readLine()) != null) {
System.out.println("read " + message);
tellEveryone(message);
}
} catch (Exception ex) { ex.printStackTrace(); }
}
}
public static void main(String[] args) {
new VerySimpleChatServer().go();
}
public void go() {
clientOutputStreams = new ArrayList();
try {
ServerSocket serverSock = new ServerSocket(5000);
while(true) {
Socket clientSocket = serverSock.accept();
PrintWriter writer = new PrintWriter(clientSocket.getOutputStream());
clientOutputStreams.add(writer);
Thread t = new Thread(new ClientHandler(clientSocket));
t.start();
System.out.println("got a connection");
}
} catch (Exception ex) { ex.printStackTrace(); }
}
public void tellEveryone(String message) {
Iterator it = clientOutputStreams.iterator();
while (it.hasNext()) {
try {
PrintWriter writer = (PrintWriter) it.next();
writer.println(message);
writer.flush();
} catch (Exception ex) { ex.printStackTrace(); }
}
}
}
clientOutputStreams不是一個* strings *數組,而是一個* streams * =>數組,即給客戶端的「管道」。 – Joel
是否意味着如果總共有10個客戶端,那麼clientOutputStream的大小是10? – Duke
是的,就是這樣。每次接受客戶端連接時,該列表都會增長。正如下面的答案所述,每次在控制檯上寫入一個字符串時,它都會一次向客戶端廣播一個字符串。 – Joel