자바 소켓으로 양방향 채팅 만들기

=================서버=====================

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.ServerSocket;

import java.net.Socket;

import java.util.Scanner;

class A implements Runnable {

ServerSocket ss;

Socket s;

OutputStream os;

InputStream is;

Scanner sc;

String str;

void init() {

try {

ss = new ServerSocket(7777);

s = ss.accept();

os = s.getOutputStream();

is = s.getInputStream();

} catch (Exception ee) {

}

}

public void run() {

read();

}

public void read() {

while (true) {

sc = new Scanner(is);

str = sc.nextLine();

System.out.println(str);

}

}

public void send() {

sc = new Scanner(System.in);

try {

str = sc.nextLine() + "\n";

os.write(str.getBytes());

} catch (Exception e) {

}

}

}

public class geeserver {

public static void main(String[] args) {

A a = new A();

Thread th = new Thread(a);

a.init();

th.start();

a.send();

}

}