Android development _ socket (2)

Socket programming 1. Basic Introduction

Socket"

Socket is also known as "socket". It is used to describe IP addresses and ports and is a communication chain handle.

Applications usually send requests to or respond to network requirements through "Sockets ".

 

 

 

2. scoket basic communication model

 

Serversocket ______________________________________________ server end including TCP and UDP

Package COM. example. socket_server; import Java. io. inputstream; import java.net. datagrampacket; import java.net. datagramsocket; import java.net. serversocket; import java.net. socket; import android. app. activity; import android. database. mergecursor; import android. OS. bundle; import android. util. log; import android. view. menu; import android. view. view; import android. view. view. onclicklistener; import android. widget. Button; public class socketserveractivity extends activity {private button start_socket; @ overrideprotected void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. activity_socket_server); // start uistart_socket = (button) findviewbyid (R. id. socketserver); start_socket.setonclicklistener (New onclicklistener () {@ overridepublic void onclick (view arg0) {// todo Auto-generated method stubnew serverthread (). start () ;}}) ;}// TCP/* class serverthread extends thread {@ overridepublic void run () {// todo auto-generated method stubsuper. run (); serversocket mserversocket = NULL; try {// create a serversocket and let the socket listen to mserversocket = new serversocket (1234) on port 1234; log. D ("mydebug", "now waiting serverscoket. accept ()! "); Socket msocket = mserversocket. accept (); inputstream minputstream = msocket. getinputstream (); byte buffer [] = new byte [1024*4]; int temp = 0; while (temp = minputstream. read (buffer ))! =-1) {log. D ("mydebug", "Now is printing the string! "); System. out. println (new string (buffer, 0, temp) ;}} catch (exception e) {e. printstacktrace ();} finally {try {mserversocket. close ();} catch (exception e) {e. printstacktrace () ;}}} * // udpclass serverthread extends thread {@ overridepublic void run () {// todo auto-generated method stubsuper. run (); try {datagramsocket Socket socket = new datagramsocket (1234); byte data [] = new byte [1024*4]; datagrampacket packet = new datagrampacket (data, data. length); socket. receive (packet); string result = new string (packet. getdata (), packet. getoffset (), packet. getlength (); system. out. println ("result ------------>" + result);} catch (exception e) {e. printstacktrace () ;}}@ overridepublic Boolean oncreateoptionsmenu (menu) {// inflate the menu; this adds items to the action bar if it is present. getmenuinflater (). inflate (R. menu. activity_socket_server, menu); Return true ;}}

3. TCP-based scoket

package client;import java.io.FileInputStream;import java.io.InputStream;import java.io.OutputStream;import java.net.Socket;public class Client_TCP {private String str = "abcdefghijklnopqrstuvwxyz!";public static void main(String[] args) {try{Socket mSocket = new Socket("192.169.0.1", 1234);InputStream mInputStream = new FileInputStream("I:\\1.txt");OutputStream mOutputStream = mSocket.getOutputStream();byte buffer[] = new byte[1024*4];int temp = 0 ;while((temp = mInputStream.read(buffer)) != -1){mOutputStream.write(buffer, 0, temp);}mOutputStream.flush();}catch(Exception e){e.printStackTrace();}}}

4. UDP-based scoket

package client;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;public class Client_UDP {public static void main(String[] args) {try {DatagramSocket socket = new DatagramSocket(1234);InetAddress serverAddress = InetAddress.getByName("192.168.0.1");String str = "abcdefghijkmnopqstuvwyz";byte data[] = new byte[1024 * 4];data = str.getBytes();DatagramPacket packet = new DatagramPacket(data, data.length, 1234);socket.send(packet);} catch (Exception e) {e.printStackTrace();}}}