Android Server-side design

1. Create your own Myservletcontextlistener.java:

Package YYBWB;

Import Java.net.ServerSocket;

Import javax.servlet.ServletContextEvent;

Import Javax.servlet.ServletContextListener;

public class Myservletcontextlistener implements Servletcontextlistener

{//This enables the class to implement the Servletcontextlistener listener interface, which is invoked when Tomcat is started

The Contextinitialized method

ServerSocket SS = null;//Declaration ServerSocket Object

Serverthread st = null;//Declaration Serverthread Object

Create a service thread and start it, this method is called when TOMCA starts

public void contextinitialized (Servletcontextevent sce) {

try{ss = new ServerSocket (8888);

st = new Serverthread (ss);

St.start ();

}catch (Exception e) {e.printstacktrace ();

}  }

Stop the service thread, this method is called when TOMCA stops

public void contextdestroyed (Servletcontextevent sce) {

try{St.flag = false;

Ss.close ();

SS = NULL;

st = NULL; }catch (Exception e) {e.printstacktrace ();

}  } }

2. Configure the above listening class in Web. xml

<Listener>

<listener-class>xx. Myservletcontextlistener</listener-class>

</Listener>

3. Create a service thread Serverthread class such as:

Package YYBWB;

Import Java.net.ServerSocket;

Import Java.net.Socket;

Import java.net.SocketException;

public class Serverthread extends thread{

Public ServerSocket SS; Declaring ServerSocket objects

public Boolean flag = FALSE; Loop flag bit

Public Serverthread (ServerSocket ss) {//constructor

THIS.SS = SS;

Flag = true; }

The Run method creates a ServerSocket listener

public void Run () {

while (flag) {

try{

Socket socket = ss.accept ();

After the client connects, create the agent thread ServerAgent, which is responsible for communicating with the customer

ServerAgent sa = new serveragent (socket);

Sa.start ();

}

catch (SocketException se) {

try{Ss.close ();

SS = NULL;

System.out.println ("ServerSocket closed");

}catch (Exception ee) {

Ee.printstacktrace ();

}

}

catch (Exception e) {

E.printstacktrace ();

}

}

}

}

4. Agent thread serveragent, such as:

Package YYBWB;

/**LASTDATE:2014-10-22 * Update Menu-#GET_MENULIST # * Author:wuchyuan * *

Import static YYBWB. constantutil.delete_success;

Import static YYBWB. constantutil.diary_success;

Import static YYBWB. Constantutil.register_fail;

Import static YYBWB. constantutil.update_state_success;

Import Java.io.DataInputStream;

Import Java.io.DataOutputStream;

Import java.io.EOFException;

Import java.io.IOException;

Import Java.net.Socket;

Import java.net.SocketException;

Import Java.sql.Blob;

Import java.util.ArrayList;

Import java.util.List;

public class ServerAgent extends thread{

public socket socket;

public DataInputStream din;

Public DataOutputStream dout;

Boolean flag = false;

Public serveragent (socket socket)

{this.socket = socket;

try {This.din = new DataInputStream (Socket.getinputstream ()); This.dout = new DataOutputStream (Socket.getoutputstream ());

Flag =true;

} catch (IOException e) {e.printstacktrace (); }}//Method: Thread Execution method

public void Run () {

while (flag) {

try {String msg = Din.readutf (); Receive messages from clients

SYSTEM.OUT.PRINTLN ("The message Received is:" +msg);

if (Msg.startswith ("< #LOGIN #>")) {//message is logged in

String content = msg.substring (9); Get message Content

String [] sa = Content.split ("\\|");

arraylist<string> result = Dbutil.checklogin (Sa[0], sa[1]);

if (Result.size () >1) {//Login successful

StringBuilder sb = new StringBuilder ();

Sb.append ("< #LOGIN_SUCCESS #>");

for (String S:result) {

Sb.append (s);

Sb.append ("|"); }

String logininfo = sb.substring (0,sb.length ()-1);

Dout.writeutf (Logininfo); Returns the user's basic information}

else{//Login failed

String Logininfo = "< #LOGIN_FAIL #>" +result.get (0);

Dout.writeutf (Logininfo); }     }

MEALSVR's message, 2014-7-9

else if (Msg.startswith ("< #PRINT_DINGD #>")) {

Message print order for query 2014-7-9

msg = msg.substring (15); Extract Content

String [] sa = Msg.split ("\\|"); Split string

Boolean result = Dbutil.queryprint (sa[0]); Query whether there is a need to print orders

if (result) {//There is an order

Dout.writeutf ("< #HAVE_DINGD #>"); Send back Success Message

Dout.flush ();

} else{

Dout.writeutf ("< #NOT_DINGD #>"); Send back Create failure message

Dout.flush (); }           }

2014-10-22 Check User password

else if (Msg.startswith ("< #CHECK_USERPASSWD #>")) {

msg = msg.substring (20); Extract Content

String [] sa = Msg.split ("\\|"); Split string

Boolean result = DBUTIL.CHECKUSERPW (sa[0],sa[1]); Query whether there is a need to print orders

SYSTEM.OUT.PRINTLN ("Query" +sa[0]+ "password is correct");

if (result) {//has

Dout.writeutf ("< #CHECKPWD_HAVE #>"); Send back Success Message

Dout.flush (); }

else{

Dout.writeutf ("< #CHECKPWD_NOT #>"); Send back Create failure message

Dout.flush ();

}

}

}

} catch (SocketException se) {try {

Dout.close ();

Din.close ();

Socket.close ();

socket = NULL;

Flag = false;

} catch (IOException e) {

E.printstacktrace (); }

} catch (Eofexception eof) {

try {dout.close ();

Din.close ();

Socket.close ();

socket = NULL;

Flag = false;

} catch (IOException e) {

E.printstacktrace (); }

} catch (Exception e) {

E.printstacktrace ();

}

}

}

}

Android Server-side design