Created
May 10, 2020 14:10
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SimpleClient – najprostszy klient w Javie, standardowe biblioteki, dużo komentarzy
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import java.io.BufferedReader; | |
import java.io.InputStream; | |
import java.io.InputStreamReader; | |
import java.io.OutputStream; | |
import java.io.PrintWriter; | |
import java.net.Socket; | |
public class SimpleClient { | |
public static void main(String args[]) { | |
/* | |
* Client request -> PrintWriter -> OutputStream -> Client Socket | |
* || | |
* vv | |
* Network | |
* || | |
* vv | |
* Handle req <- Buffered Reader <- InputStream <- Server Socket | |
* || | |
* vv | |
* Server response -> PrintWriter -> OutputStream -> Server Socket | |
* || | |
* vv | |
* Network | |
* || | |
* vv | |
* Handle resp <- Buffered Reader <- InputStream <- Client Socket | |
*/ | |
try { | |
// Otwarcie gniazda, na które klient będzie wysyłał - port musi być | |
// taki sam, jak w serwerze | |
Socket socket = new Socket("localhost", 21370); | |
// Strumień na którym wysyłamy informacje na serwer | |
OutputStream os = socket.getOutputStream(); | |
// Writer na strumień | |
PrintWriter pw = new PrintWriter(os, true); | |
// Przykładowe informacje dawane na writer (client request) | |
pw.println("Client request 12345"); | |
// Strumień na którym odczytujemy informacje zwrotne z serwera (server response) | |
InputStream is = socket.getInputStream(); | |
// Reader ze strumienia | |
BufferedReader br = new BufferedReader(new InputStreamReader(is)); | |
System.out.println(br.readLine()); | |
socket.close(); | |
br.close(); | |
} catch (Exception e) { | |
System.err.println("Client exception: " + e); | |
} | |
} | |
} |
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