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();    

 }   

 }  

 }

 }