Xmpp knowledge preparation for Android interview technical points and xmpp knowledge for Android interviews

Xmpp knowledge preparation for Android interview technical points and xmpp knowledge for Android interviews

When xmpp push and xmpp instant messaging are added to your resume, you can spend more than 1000 oceans. The main use is to use socket for communication, but now the integration framework is generally used for development. However, we still need to understand the basics.

Key knowledge points: I/O Stream and socket basic knowledge

This chapter mainly summarizes the videos explained by Guo Dashen.

The client provides the following functions: sending and receiving messages.

Package com. xiaoxin. client; import java. io. bufferedReader; import java. io. bufferedWriter; import java. io. IOException; import java. io. inputStreamReader; import java. io. outputStreamWriter; import java.net. socket; public class socketClient {/*** read our input information */private BufferedReader readClientPrintMsg;/*** read server information */private BufferedReader serverToClientMsg; /*** send message */private BufferedWriter ClientToServerMsg; Private Socket socket; public static void main (String [] args) {// socket client socketClient client = new socketClient (); client. start ();} private void start () {try {socket = new Socket ("127.0.0.1", 9898); ClientToServerMsg = new BufferedWriter (new OutputStreamWriter (socket. getOutputStream (); readClientPrintMsg = new BufferedReader (new InputStreamReader (System. in); serverToClientMsg = new BufferedReader (new I NputStreamReader (socket. getInputStream (); // input String readerConetnt; // send the entered information out while (! (ReaderConetnt = readClientPrintMsg. readLine ()). equals ("bye") {// System. out. println (readerConetnt); ClientToServerMsg. write (readerConetnt + "\ n"); ClientToServerMsg. flush (); String serverToMsg = serverToClientMsg. readLine (); System. out. println (serverToMsg) ;}} catch (IOException e) {e. printStackTrace ();} finally {try {// close the stream socket. close (); ClientToServerMsg. close (); readClientPrintMsg. close (); serverToClientMsg. close ();} catch (IOException e) {e. printStackTrace ();}}}}

Server-side writing server-side implementation functions: sending and receiving messages

Package com. xiaoxin. socketServer; import java. io. bufferedReader; import java. io. bufferedWriter; import java. io. IOException; import java. io. inputStreamReader; import java. io. outputStreamWriter; import java.net. serverSocket; import java.net. socket; public class SocketServer {/*** Socket server */private ServerSocket socket; // accept information private BufferedReader clientToServerMsg; // send information private BufferedWriter serverToClien TMsg; private Socket client; public static void main (String [] args) {SocketServer server = new SocketServer (); server. startServer ();} public void startServer () {try {// port 9898 socket = new ServerSocket (9898); System. out. println ("server startup"); // enter the blocking status. Wait for the client to intervene and return a socket object client = socket. accept (); System. out. println ("client" + socket. hashCode () + "connected"); clientToServerMsg = new BufferedReader (new InputStreamReader (clien T. getInputStream (); serverToClientMsg = new BufferedWriter (new OutputStreamWriter (client. getOutputStream (); String readermsg; // one row reads the value while (readermsg = clientToServerMsg. readLine ())! = Null) {System. out. println (readermsg); serverToClientMsg. write ("server reply" + readermsg + "\ n"); serverToClientMsg. flush () ;}} catch (IOException e) {e. printStackTrace ();} finally {try {client. close (); clientToServerMsg. close (); socket. close (); serverToClientMsg. close ();} catch (IOException e) {e. printStackTrace ();}}}}

To be continued
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