자바 소켓통신 간단한 질문입니다 ...ㅠㅠ(본삭금)

=======================================서버부분=====================================

package firstserver;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.net.ServerSocket;

import java.net.Socket;

import java.io.*;

public class firser {

private static Socket socket;

private static DataInputStream in;

private static DataOutputStream out;

private static ServerSocket serversocket;

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

serversocket = new ServerSocket(7777);

socket = new Socket();

System.out.println("서버생성됨");

System.out.println("클라이언트접속대기중");

serversocket.accept();

if (serversocket.accept() != null) {

System.out.println(socket.getInetAddress() + "클라이언트접속완료");

}

DataInputStream in = new DataInputStream(socket.getInputStream());

DataOutputStream out = new DataOutputStream(socket.getOutputStream());

System.out.print(out);

}

=============================================클라이언트부분===============================

package firstserver;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.net.*;

public class client {

private static Socket socket;

private static DataInputStream in;

private static DataOutputStream out;

public static void main(String[] args) {

try {

socket = new Socket("127.0.0.1", 7777);

System.out.println("연결됨");

out = new DataOutputStream(socket.getOutputStream());

in = new DataInputStream(socket.getInputStream());

in.read();

System.out.print("메세지전송완료");

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

========================오류메세지 =================

연결됨

java.net.SocketException: Connection reset

at java.net.SocketInputStream.read(Unknown Source)

at java.io.FilterInputStream.read(Unknown Source)

제가 초보라서 .....왜 이런 에러가 뜰가요..