Java Socket Test Example (1) 자바 소켓 예시

Java Socket Test Example (1) 자바 소켓 예시

package SocketTest;
 
import java.io.*;
import java.net.*;
 
public class EchoClient {
    public static void main(String[] args) {
        try {
            String host;
            if (args.length > 0) {
                host=args[0];
            } else {
                host = "localhost";
                // host = "172.17.193.68";
            }
 
            Socket socket = new Socket(host, 8008);
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            PrintWriter out = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));
 
            // send data to the server
            for (int i=1; i<=10; i++) {
                System.out.println("Sending: line " + i);
                out.println("line " + i);
                out.flush();
            }
            out.println("BYE");
            out.flush();
            
            // receive data from the server
            while (true) {
                String str = in.readLine();
                if (str == null) {
                    break;
                } else {
                    System.out.print(str);
                }
            }
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    }

 

package SocketTest;
 
 
import java.io.*;
import java.net.*; 
 
class EchoServer {
    public static void main(String[] args) {
        System.out.println("EchoServer started."); 
        try {
            
            ServerSocket s = new ServerSocket(8008); 
            Socket incoming = s.accept(); 
    
            System.out.println("Connected to: " + incoming.getInetAddress() +
                 " at port: " + incoming.getLocalPort()); 
          
            BufferedReader in  = new BufferedReader(new InputStreamReader(incoming.getInputStream())); 
            PrintWriter out = new PrintWriter(new OutputStreamWriter(incoming.getOutputStream())); 
    
            out.println("Hello! This is Java EchoServer. Enter BYE to exit."); 
            out.flush();
              
            for ( ; ; ) {
                String str = in.readLine(); 
                if (str == null)
                {
                    break; 
                } 
                else
                {
                    out.println("Echo: " + str); 
                    out.flush();
                    System.out.println("Received: " + str);
                  
                    if (str.trim().equals("BYE")) {
                        break;  
                    } 
                }
            }
            incoming.close(); 
 
            } catch (Exception e) {
                System.out.println("Error: " + e); 
            }
            System.out.println("EchoServer stopped."); 
    }
 
}
 

 

실행 방법 & 결과

1. javac EchoServer.java (on prompt #01)

2. javac EchoClient.java (on prompt #02)

3. java EchoServer (on prompt #01)

4. java EchoClient (on prompt #02)