Page 313 - MDP2020-1

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라즈베리파이4(버전)
<라즈베리파이>
(TCP/IP 통신 및 제어)
import java.io.BufferedReader;

import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.ObjectOutputStream;
import java.io.OutputStreamWriter;

import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class SocketServer implements Runnable {
public static final int ServerPort = 9999;

@Override
public void run() {
try {

ServerSocket serverSocket = new ServerSocket(ServerPort);//소켓생성
System.out.println("Connecting...");
while (true) {
//client 접속 대기
Socket client = serverSocket.accept(); //데이터 전송 감지
System.out.println("Receiving...");

try {

//client data 수신

//소켓에서 넘오는 stream 형태의 문자를 얻은 후 읽어 들어서

bufferstream 형태로 in 에 저장.

BufferedReader in = new BufferedReader(new
InputStreamReader(client.getInputStream()));
//in에 저장된 데이터를 String 형태로 변환 후 읽어들어서 String에 저장

String str = in.readLine();
System.out.println("Received: '" + str + "'");
//client에 다시 전송
PrintWriter out = new PrintWriter(new BufferedWriter(new
OutputStreamWriter(client.getOutputStream())), true);

out.println("Server Received : '" + str + "'");