bank.java

用jsp＋servlet

package server;

import java.io.*;
import java.util.ArrayList;
import java.net.*;

/**
 * A bank contains customers with bank accounts.
 */
public class Bank {
	/**
	 * Constructs a bank with no customers.
	 */
	public Bank() {
		customers = new ArrayList();
	}

	/**
	 * Reads the customer numbers and pins and initializes the bank accounts.
	 * 
	 * @param filename
	 *            the name of the customer file
	 */
	public void readCustomers(String filename) throws IOException {
		URLConnection con = getServletConnection("login");
		OutputStream outstream = con.getOutputStream();
		ObjectOutputStream oos = new ObjectOutputStream(outstream);
		oos.writeObject(null);
		oos.flush();
		oos.close();

		// receive result from servlet
		InputStream instr = con.getInputStream();
		ObjectInputStream inputFromServlet = new ObjectInputStream(instr);
		try {
			ArrayList<String> result = (ArrayList<String>) inputFromServlet.readObject();
			for(String s :result) {
				String[] a = s.split("&");
				Customer c = new Customer(Integer.parseInt(a[0]),Integer.parseInt(a[1]));
				addCustomer(c);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}		
		inputFromServlet.close();
		instr.close();

	}

	/**
	 * Adds a customer to the bank.
	 * 
	 * @param c
	 *            the customer to add
	 */
	public void addCustomer(Customer c) {
		customers.add(c);
	}

	/**
	 * Finds a customer in the bank.
	 * 
	 * @param aNumber
	 *            a customer number
	 * @param aPin
	 *            a personal identification number
	 * @return the matching customer, or null if no customer matches
	 */
	public Customer findCustomer(int aNumber, int aPin) {
		for (int i = 0; i < customers.size(); i++) {
			Customer c = (Customer) customers.get(i);
			if (c.match(aNumber, aPin))
				return c;
		}
		return null;
	}

	private URLConnection getServletConnection(String addr)
			throws MalformedURLException, IOException {

		// Connection zum Servlet 鰂fnen
		URL urlServlet = new URL("http://localhost:8080/mid3t/" + addr);
		URLConnection con = urlServlet.openConnection();

		// konfigurieren
		con.setDoInput(true);
		con.setDoOutput(true);
		con.setUseCaches(false);
		con.setRequestProperty("Content-Type",
				"application/x-java-serialized-object");

		// und zur點kliefern
		return con;
	}

	private ArrayList customers;
}