bankinterfaceimpl.java

java编程好的网上银行的例子

import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.RMISecurityManager;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.rmi.*;
import java.util.*;


/*
 * 创建日期 2005-9-14
 *
 * TODO 要更改此生成的文件的模板，请转至
 * 窗口 － 首选项 － Java － 代码样式 － 代码模板
 */

public class BankInterfaceImpl extends UnicastRemoteObject implements
        BankInterface{
        private static Vector v;
        private Set clients = new HashSet();


    public BankInterfaceImpl() throws RemoteException {
        super();
    }

    public Data login(int accountNumber, String password) {
       //System.out.println(accountNumber+"  "+password);
       int i =v.size();
       for(int j=0;j<i;j++){
           Data da=(Data)v.elementAt(j);
           if(da.getAccountNumber()==accountNumber&&da.getPassword().equals(password)){
               return da;
           }
       }
        return new Data(-1,null,null,null);
    }

    // Add method to withdraw cash from this account
    public Data registe(String name, String residence, String password) {
        Data da =(Data)v.lastElement();
        System.out.print(da.getAccountNumber());
        da=new Data(da.getAccountNumber()+1,password,name,residence);
        v.add(da);  
        return da;
    }

    public void remit(int from, int to, int amount) {
        int i =v.size();
        for(int j=0;j<i;j++){
            Data da=(Data)v.elementAt(j);
            if(da.getAccountNumber()==from){
                System.out.println("transfering money");
                da.paysTo(to,amount);
                System.out.println("transfered money");
                postMessage(da);
            }
        }
        for(int j=0;j<i;j++){
            Data da=(Data)v.elementAt(j);
            if(da.getAccountNumber()==to){
                System.out.println("receiving money");
                da.receives(to,amount);
                System.out.println("received money");
                postMessage(da);
            }
        }
    } 

    public void logOff(BankUserInterface b) {
        synchronized(clients){
            clients.remove(b);
        }
        System.out.println("Unregistered Client:" + b);

    }
    
    public void registerClient(BankUserInterface b){
        synchronized(clients){
            clients.add(b);
        }
        System.out.println("Registered Client:" + b);
    }
    
    public void postMessage(Data d){
        Iterator iterator = null;
        synchronized(clients){
            iterator = new HashSet(clients).iterator();
        }
        while(iterator.hasNext()){
            BankUserInterface bankuser = (BankUserInterface)iterator.next();
            try{
               bankuser.display(d); 
            }
            catch(Exception e){
                System.err.println("Unregistering absent client");
                logOff(bankuser);
            }
        }
    }


    public static void main(String args[]) {
        if (System.getSecurityManager() == null) {
            System.setSecurityManager(new RMISecurityManager());
        }

        BankInterfaceImpl bm = null;
        Data d = new Data();
        v= new Vector();
        v.add(d);

        
        try {
            // Create a BankManager object
            bm = new BankInterfaceImpl();

            // Export it to RMI
            UnicastRemoteObject.exportObject(bm);
        } catch (RemoteException remoteException) {
            System.err.println("Failure during object export to RMI: "
                    + remoteException);
        }

        // Register an external name for the service
        try {
            Naming.rebind("//localhost/Bank", bm);
        } catch (RemoteException remoteException) {
            System.err.println("Failure during Name registration: "
                    + remoteException);
        } catch (MalformedURLException malformedException) {
            System.err.println("Failure during Name registration: "
                    + malformedException);
        }

        System.out.println("Server started.");
        
    }

}