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Chat_server.java
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88 lines (79 loc) · 2.01 KB
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package Server;
import java.io.*;
import java.net.*;
import java.util.*;
public class Chat_server {
/* Server for chat. */
private static final int PORT = 9002; // The port that the server listens on.
private static HashSet<String> names = new HashSet<String>();
private static HashSet<PrintWriter> writers = new HashSet<PrintWriter>();
public static void main(String[] args) throws Exception {
System.out.println("The chat server is running.");
ServerSocket listener = new ServerSocket(PORT);
try {
while (true) {
new Handler(listener.accept()).start();
}
} finally {
listener.close();
}
}
private static class Handler extends Thread {
private String name;
private Socket socket;
private BufferedReader in;
private PrintWriter out;
public Handler(Socket socket) {
this.socket = socket;
}
public void run() {
try {
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new PrintWriter(socket.getOutputStream(), true);
while (true) {
name = in.readLine();
System.out.println(name);
if (name == null) {
return;
}
synchronized (names) {
if (!names.contains(name)) {
names.add(name);
break;
}
}
}
out.println("NAMEACCEPTED");
writers.add(out);
for (PrintWriter writer : writers) {
writer.println("ENTRANCE " + name + "님이 입장하셨습니다."); // Enter to chat
}
while (true) {
String input = in.readLine();
if (input == null) {
return;
}
for (PrintWriter writer : writers) {
writer.println("MESSAGE " + name + ": " + input); // chat message
}
}
} catch (IOException e) {
System.out.println(e);
} finally {
for (PrintWriter writer : writers) {
writer.println("EXIT " + name + "님이 퇴장하셨습니다."); // exit from chat
}
if (name != null) {
names.remove(name);
}
if (out != null) {
writers.remove(out);
}
try {
socket.close();
} catch (IOException e) {
}
}
}
}
}