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

Before always use sockets to achieve emulator and PC communication, card for a few days, finally ask other people finally can connect.The cause of the error is the IP and port, IP to use the native IP (in cmd input ipconfig, note: Each boot native IP is different, ADSL is dynamic IP), port with the name of emulator, 5554 or 5556.java sever file to build another Java project run , the Android project is not running 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); Sends a message to the server printwriter out = new PrintWriter (new BufferedWriter (New OutputStreamWriter (Socket.geto                             Utputstream ())), 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 ());       }               }           }); }} 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 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 ());}} });  } }

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 Desktopservert           Hread = new Thread (new Server ());       Desktopserverthread.start ();   }   }