One of the ways Android communicates with the server (TCP) high efficiency and security

Client code:

Java code

Package com.yarin.android.Examples_08_04;  Import Java.io.BufferedReader;  Import Java.io.BufferedWriter;  Import Java.io.InputStreamReader;  Import Java.io.OutputStreamWriter;  Import Java.io.PrintWriter;  Import java.net.InetAddress;  Import Java.net.Socket;  Import android.app.Activity;  Import Android.os.Bundle;  Import Android.util.Log;  Import Android.view.View;  Import Android.view.View.OnClickListener;  Import Android.widget.Button;  Import Android.widget.EditText;     Import Android.widget.TextView;              public class Activity01 extends Activity {private final String Debug_tag = "Activity01";      Private TextView Mtextview=null;      Private EditText Medittext=null;             Private Button Mbutton=null;          @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);                      Setcontentview (R.layout.main);          Mbutton = (Button) Findviewbyid (R.ID.BUTTON01); MTextview= (TextView) Findviewbyid (R.ID.TEXTVIEW01);                      medittext= (EditText) Findviewbyid (r.id.edittext01);              Login Mbutton.setonclicklistener (new Onclicklistener () {public void OnClick (View v)                  {SOCKET socket = NULL;                   String message = Medittext.gettext (). toString () + "\ r \ n";  try {//create socket SOCKET = new Socket ("116.29.27.138", 5554);                      View native IP, each boot is different//socket=new socket ("192.168.1.110", 50000); Sends a message to the server printwriter out = new PrintWriter (new BufferedWriter (New OutputStreamWriter (Socket.getou                            Tputstream ())), true);                                               OUT.PRINTLN (message);                       Receive messages from the server BufferedReader br = new BufferedReader (New InputStreamReader (Socket.getinputstream ())); StRing msg = Br.readline ();                      if (msg! = null) {Mtextview.settext (msg);                      } else {mtextview.settext ("Data Error!");                      }//Close stream out.close ();                      Br.close ();                   Close socket Socket.close ();                      } catch (Exception e) {//Todo:handle Exception                  LOG.E (Debug_tag, e.tostring ());      }              }          }); }} Import Java.io.bufferedreader;import Java.io.bufferedwriter;import Java.io.inputstreamreader;import Java.io.outputstreamwriter;import Java.io.printwriter;import Java.net.inetaddress;import Java.net.Socket;import Android.app.activity;import Android.os.bundle;import Android.util.log;import andRoid.view.view;import Android.view.view.onclicklistener;import Android.widget.button;import Android.widget.edittext;import Android.widget.TextView; public class Activity01 extends Activity{private final String debug_tag = "Activity01"; private TextView MTEXTVIEW=NULL;PR  Ivate EditText medittext=null;private Button mbutton=null; @Overridepublic void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview ( R.layout.main); Mbutton = (Button) Findviewbyid (R.id.button01); mtextview= (TextView) Findviewbyid (r.id.textview01); medittext= ( EditText) Findviewbyid (r.id.edittext01); Login Mbutton.setonclicklistener (new Onclicklistener () {public void OnClick (View v) {socket socket = NULL; String message = Medittext.gettext (). toString () + "\ r \ n"; try{//Create Socketsocket = new Socket ("116.29.27.138", 5554);// View the native IP, each boot is different//socket=new socket ("192.168.1.110", 50000);//Send message to server printwriter out = new PrintWriter (new    BufferedWriter (New OutputStreamWriter (Socket.getoutputstream ())), true); OUT.PRINTLN (message); Receive messages from the server BufferedReader br = new BufferedReader (New InputStreamReader (Socket.getinputstream ())); String msg = Br.readline (); if (msg! = null) {Mtextview.settext (msg);} Else{mtextview.settext ("Data Error!");} Close stream Out.close (); Br.close ();//close Socketsocket.close ();} catch (Exception e) {//Todo:handle exceptionlog.e (Debug_tag, e.tostring ());}});}}     Server-side code: Java code Package com.yarin.android.Examples_08_04;  Import Java.io.BufferedReader;  Import Java.io.BufferedWriter;  Import Java.io.InputStreamReader;  Import Java.io.OutputStreamWriter;  Import Java.io.PrintWriter;  Import Java.net.ServerSocket;     Import Java.net.Socket; public class Server implements Runnable {public void run () {try {//Create SERVERSOC              Ket ServerSocket serversocket = new ServerSocket (5554);                  while (true) {//accepts client requests for Socket clients = serversocket.accept (); System.out.println ("ACcept "); try {//Receive client message BufferedReader in = new BufferedReader (New Input                      StreamReader (Client.getinputstream ()));                      String str = in.readline ();                        System.out.println ("read:" + str); Sends a message to the server printwriter out = new PrintWriter (new BufferedWriter (New OutputStreamWriter (Client.getou                            Tputstream ())), true);                       OUT.PRINTLN ("Server Message");                      Close flow out.close ();                  In.close ();                      } catch (Exception e) {System.out.println (E.getmessage ());                  E.printstacktrace ();                      } finally {//close client.close ();                  System.out.println ("close");     }              }     } catch (Exception e) {System.out.println (E.getmessage ()); }}//main function, open server public static void main (String a[]) {Thread desktopserverthread = new THR          EAD (New Server ());      Desktopserverthread.start (); }  }

One of the ways Android communicates with the server (TCP) high efficiency and security