Android服务端的设计

1.创建自己的MyServletContextListener.java：

package yybwb;

import java.net.ServerSocket;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

public class MyServletContextListener implements ServletContextListener

{ //这里使该类实现 ServletContextListener监听接口，在Tomcat启动时会调用实现该接口

//的 contextInitialized方法

 ServerSocket ss = null;//声明ServerSocket对象

 ServerThread st = null;//声明ServerThread对象

 

 //创建服务线程，并将其启动，本方法在tomca启动时调用  

public void contextInitialized(ServletContextEvent sce){

  try{    ss = new ServerSocket(8888);

 

  st = new ServerThread(ss);  

  st.start();

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

  }  }    

 

//停止服务线程，本方法在tomca停止时调用

public void contextDestroyed(ServletContextEvent sce){  

 

 try{    st.flag = false;  

   ss.close();  

  ss = null;  

  st = null;   }catch(Exception e){    e.printStackTrace();  

 }  } }

2.在Web.xml中配置上面的监听类

<Listener>

  <Listener-class>XX.MyServletContextListener</Listener-class>

</Listener>

3.创建服务线程ServerThread类如：

package yybwb;

import java.net.ServerSocket;

import java.net.Socket;

import java.net.SocketException;

public class ServerThread extends Thread{

 public ServerSocket ss;  //声明ServerSocket对象

 public boolean flag = false; //循环标志位

   public ServerThread(ServerSocket ss){ //构造器  

  this.ss = ss; 

  flag = true;  }

//run方法创建ServerSocket 监听

 public void run(){

  while(flag){

   try{

    Socket socket = ss.accept();

//客户连接后，创建代理线程 ServerAgent，负责与该客户的通讯

    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.代理线程ServerAgent，如：

package yybwb;

/**LastDate:2014-10-22  * 更新菜单-#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();   }  }  //方法：线程执行方法    

   public void run(){     

  while(flag){   

   try {     String msg = din.readUTF();   //接收客户端发来的消息

//    System.out.println("收到的消息是："+msg);    

  if(msg.startsWith("<#LOGIN#>")){    //消息为登录    

  String content = msg.substring(9);   //获得消息内容    

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

    ArrayList<String> result = DBUtil.checkLogin(sa[0], sa[1]);    

  if(result.size()>1){   //登录成功   

    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);   //返回用户的基本信息         }     

 else{    //登录失败   

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

   dout.writeUTF(loginInfo);      }     }     

     //mealSvr发来的消息 2014-7-9  

   else if(msg.startsWith("<#PRINT_DINGD#>")){  

  //消息为查询打印订单2014-7-9      

msg = msg.substring(15);    //提取内容    

  String [] sa = msg.split("\\|");  //分割字符串      

boolean result = DBUtil.QueryPrint(sa[0]);  //查询是否有需打印订单     

 //      if(result){  //有订单     

  dout.writeUTF("<#HAVE_DINGD#>");  //发回成功消息  

     dout.flush();                       

     }      else{  

     dout.writeUTF("<#NOT_DINGD#>");   //发回创建失败消息   

    dout.flush();      }           }          

     //2014-10-22 检查用户密码   

 

  else if(msg.startsWith("<#CHECK_USERPASSWD#>")){   

 //      msg = msg.substring(20);    //提取内容    

  String [] sa = msg.split("\\|");  //分割字符串  

    boolean result = DBUtil.CheckUserPw(sa[0],sa[1]);  //查询是否有需打印订单

     System.out.println("查询"+sa[0]+"密码是否正确");    

  if(result){  //有      

 dout.writeUTF("<#CHECKPWD_HAVE#>");  //发回成功消息    

   dout.flush();                            }     

 else{

      dout.writeUTF("<#CHECKPWD_NOT#>");   //发回创建失败消息

      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();    

}   

}  

}

}