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tanszek:oktatas:tcp_socket_connection
Különbségek
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| Előző változat mindkét oldalon Előző változat Következő változat | Előző változat | ||
|
tanszek:oktatas:tcp_socket_connection [2023/02/26 15:41] knehez [Alappéldák] |
tanszek:oktatas:tcp_socket_connection [2023/02/27 09:16] (aktuális) knehez [Exercise 1.] |
||
|---|---|---|---|
| Sor 1: | Sor 1: | ||
| - | ====== Exercise ====== | + | ====== Socket client and server exercises ====== |
| + | |||
| + | ==== Exercise 1. ==== | ||
| Create a simplified FTP (file transport) client and server where the client can send or download text files from the server: | Create a simplified FTP (file transport) client and server where the client can send or download text files from the server: | ||
| Sor 7: | Sor 9: | ||
| -) Server sends back the list of the downloadable files | -) Server sends back the list of the downloadable files | ||
| -) Client lists the files and asks the user what action they want to take? Upload or download? ('u' or 'd') | -) Client lists the files and asks the user what action they want to take? Upload or download? ('u' or 'd') | ||
| - | -) In both cases the uses must give the full file name with extension | + | -) In both cases users must give the full file name with extension |
| -) The client sends the selected file to the server (upload) or downloads the selected file from the server to a specific directory. | -) The client sends the selected file to the server (upload) or downloads the selected file from the server to a specific directory. | ||
| Sor 26: | Sor 28: | ||
| -) If you press "u", /files/ is sent to the server | -) If you press "u", /files/ is sent to the server | ||
| - | ====== Starting point of implementation ====== | + | ==== TCP style ==== |
| Sor 34: | Sor 36: | ||
| - | ==== 1.) Hagyományos blokkolt TCP alapú socket szerver ==== | ||
| - | === Socket szerver kód === | + | ==== 1.) Traditional blocked TCP based socket server class in Java ==== |
| + | |||
| + | === Socket server source code === | ||
| <code java> | <code java> | ||
| import java.io.IOException; | import java.io.IOException; | ||
| Sor 56: | Sor 59: | ||
| void run() { | void run() { | ||
| try { | try { | ||
| - | // 1. szerver socket létrehozása | + | // 1. create a socket server listening to port 8080 |
| providerSocket = new ServerSocket(8080, 10); | providerSocket = new ServerSocket(8080, 10); | ||
| - | // 2. kapcsolódásra várakozás | + | // 2. waiting for the connection (here we are waiting until next connection) |
| connection = providerSocket.accept(); | connection = providerSocket.accept(); | ||
| - | // 3. Input és Output streamek megadása | + | // 3. create Input and Output streams |
| out = new ObjectOutputStream(connection.getOutputStream()); | out = new ObjectOutputStream(connection.getOutputStream()); | ||
| in = new ObjectInputStream(connection.getInputStream()); | in = new ObjectInputStream(connection.getInputStream()); | ||
| - | // 4. socket kommunikáció | + | // 4. socket communication |
| do { | do { | ||
| try { | try { | ||
| Sor 78: | Sor 81: | ||
| ioException.printStackTrace(); | ioException.printStackTrace(); | ||
| } finally { | } finally { | ||
| - | // 4: kapcsolat lezárása | + | // 4: close connection |
| try { | try { | ||
| in.close(); | in.close(); | ||
| Sor 107: | Sor 110: | ||
| } | } | ||
| </code> | </code> | ||
| - | === Socket kliens kód === | + | === Socket client source === |
| <code java> | <code java> | ||
| import java.io.IOException; | import java.io.IOException; | ||
| Sor 126: | Sor 129: | ||
| void run() { | void run() { | ||
| try { | try { | ||
| - | // 1. socket kapcsolat létrehozása | + | // 1. try to connect to the socket: localhost:8080 |
| requestSocket = new Socket("localhost", 8080); | requestSocket = new Socket("localhost", 8080); | ||
| - | // 2. Input and Output streamek | + | // 2. Input and Output streams |
| out = new ObjectOutputStream(requestSocket.getOutputStream()); | out = new ObjectOutputStream(requestSocket.getOutputStream()); | ||
| in = new ObjectInputStream(requestSocket.getInputStream()); | in = new ObjectInputStream(requestSocket.getInputStream()); | ||
| - | // 3: Kommunikáció | + | // 3: communications |
| do { | do { | ||
| try { | try { | ||
| - | sendMessage("Hello szerver"); | + | sendMessage("Hello server"); |
| sendMessage("bye"); | sendMessage("bye"); | ||
| message = (String) in.readObject(); | message = (String) in.readObject(); | ||
| Sor 146: | Sor 149: | ||
| ioException.printStackTrace(); | ioException.printStackTrace(); | ||
| } finally { | } finally { | ||
| - | // 4: Kapcsolat zárása | + | // 4: close connection |
| try { | try { | ||
| in.close(); | in.close(); | ||
| Sor 173: | Sor 176: | ||
| } | } | ||
| </code> | </code> | ||
| + | ==== Traditional UDP style ==== | ||
| + | The following Agent sends a message and waits for a response on port 8080, also with UDP. In the Eclipse IDE, the text you type on the console can be sent by pressing ctrl+z | ||
| - | + | == Exercise 2. == | |
| - | + | Modify the code so that you can transfer a burned-in name and existing text or image file larger than 2 kbytes and verify that it was successfully sent. | |
| - | + | ||
| - | + | ||
| - | + | ||
| - | ==== 2.) Hagyományos UDP alapú kommunikáció ==== | + | |
| - | + | ||
| - | 2.a) Az alábbi Ágens küld egy üzenetet és a 8080-as porton várja a választ rá, ugyancsak UDP-vel. Az eclipse fejlesztőkörnyezetben a consolon beírt szöveget ctrl+z leütésével lehet elküldeni. | + | |
| - | + | ||
| - | **Feladat**: módosítsuk a kódot, hogy át tudjon küldeni egy beégetett nevű, és létező, 2 kbyte-nál nagyobb szöveges vagy kép állományt és ellenőrizzük a sikeres küldést. | + | |
| <code java> | <code java> | ||
| Sor 214: | Sor 211: | ||
| String modifiedSentence = new String(receivePacket.getData()); | String modifiedSentence = new String(receivePacket.getData()); | ||
| - | System.out.println("átalakítva:" + modifiedSentence); | + | System.out.println("converted:" + modifiedSentence); |
| clientSocket.close(); | clientSocket.close(); | ||
| } | } | ||
| Sor 220: | Sor 217: | ||
| </code> | </code> | ||
| - | 2.b) Az UDP szerver a 8080-as porton várja az ágensek üzeneteit és nagybetűre konvertálva visszaküldi a kliens UDP socketre. | + | 2.b) The UDP server waits for the agents messages on port 8080 and converts them to uppercase letters and sends them back to the client UDP socket. |
| <code java> | <code java> | ||
| Sor 239: | Sor 236: | ||
| DatagramPacket receivePacket = new DatagramPacket(bytesReceived, bytesReceived.length); | DatagramPacket receivePacket = new DatagramPacket(bytesReceived, bytesReceived.length); | ||
| - | // itt várakozik ameddig adat jön a 8080-as porton | + | // here we are waiting for the packets |
| serverSocket.receive(receivePacket); | serverSocket.receive(receivePacket); | ||
| - | String szoveg = new String(receivePacket.getData()); | + | String textMessage = new String(receivePacket.getData()); |
| - | System.out.println("kaptam: " + szoveg); | + | System.out.println("I got: " + textMessage); |
| InetAddress IPAddress = receivePacket.getAddress(); | InetAddress IPAddress = receivePacket.getAddress(); | ||
| int port = receivePacket.getPort(); | int port = receivePacket.getPort(); | ||
| - | String nagybetűsSzöveg = szoveg.toUpperCase(); | + | String upperCaseText = textMessage.toUpperCase(); |
| - | bytesSent = nagybetűsSzöveg.getBytes(); | + | bytesSent = upperCaseText.getBytes(); |
| - | // visszaküldi | + | // send back |
| DatagramPacket sendPacket = new DatagramPacket(bytesSent, bytesSent.length, IPAddress, port); | DatagramPacket sendPacket = new DatagramPacket(bytesSent, bytesSent.length, IPAddress, port); | ||
| serverSocket.send(sendPacket); | serverSocket.send(sendPacket); | ||
tanszek/oktatas/tcp_socket_connection.1677426092.txt.gz · Utolsó módosítás: 2023/02/26 15:41 szerkesztette: knehez
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