[Java] 79. 소켓 통신 - Half Duflex

package ex20.ch02;

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

// 반이중 통신 (Half Way)
public class MyServer02 {
    public static void main(String[] args) {
        try {
            ServerSocket ss = new ServerSocket(20000);
            System.out.println("서버 소켓이 대기 중 입니다. 연결을 시도해주세요.");

            Socket socket = ss.accept(); // 프로세스 대기 상태
            System.out.println("소켓이 연결 되었습니다.");

            BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));

            String reqbody = br.readLine();
            String respbody = "";

            // 프로토콜
            if (reqbody.equals("name")) {
                respbody = "MetaCoding";
            } else if (reqbody.equals("age")) {
                respbody = "39";
            } else respbody = "error";


            BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
            
            bw.write(respbody);
            bw.write("\n");
            bw.flush();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

package ex20.ch02;

import java.io.*;
import java.net.Socket;

public class MyClient02 {
    public static void main(String[] args) {
        try {
            Socket socket = new Socket("localhost", 20000); // 소켓 연결

            BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
            System.out.println("키보드 입력 대기 중...");
            String reqBody = keyboard.readLine(); // name, age

            BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));

            bw.write(reqBody);
            bw.write("\n"); // 외워라
            bw.flush();

            BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            String respBody = br.readLine();
            System.out.println(respBody);

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}