Method (TCP) in Android and server communication efficient security integrity

I used to use sockets to achieve emulator and PC communication, card for a few days, finally ask others to finally be able to connect.The reason for the error is that the IP and PORT,IP are to be used native IP (ipconfig in cmd input. Note: Each time the IP is different, ADSL is dynamic IP, port with emulator name, 5554 or 5556.java sever file to be built Javaproject execution. Androidproject cannot execute Java (Run application)

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", 555 4);                       View native IP, each boot is different//socket=new socket ("192.168.1.110", 50000); Send message to server printwriter out = new PrintWriter (New BufferedWriter (SOCKET.G                             Etoutputstream ())), true);                                               OUT.PRINTLN (message); Receive messages from 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 ());       }               }           }); }} 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); Send message to server printwriter out = new PrintWriter (New BufferedWriter (Socket.getoutputstream ())),      true); OUT.PRINTLN (message); Receive messages from 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 ());}} });  } }

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 Ser               Versocket 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 in                       Putstreamreader (Client.getinputstream ()));                       String str = in.readline ();                         System.out.println ("read:" + str); Send a message to the server PrinTwriter out = new PrintWriter (new BufferedWriter (New OutputStreamWriter (Client.getoutputstream ())), 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 Thread (new server ());       Desktopserverthread.start ();   }   }

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Method (TCP) in Android and server communication efficient security integrity