[英]how java SocketServer works?
我是Java新手,我无法理解void go()方法的while循环部分。accept()方法等待客户端请求连接到服务器,所以为什么其他语句(如Print writer等)却不被执行?
其他语句是否在while循环中等待accept()方法运行?
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(); }
}
}
}
没头绪,请帮忙
该接受方法不只是等待 。
它块 。 执行仅在该方法返回时才继续! “执行流”在那里停止-直到该方法调用返回之前,以下语句才是无关紧要的。
这就是全部。
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