bankaccount.java

来自「用jsp＋servlet」· Java 代码 · 共 131 行

package server;

import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;

/**
 * A bank account has a balance that can be changed by deposits and withdrawals.
 */
public class BankAccount {
	/**
	 * Constructs a bank account with a zero balance.
	 */
	public BankAccount(int aNumber, int pin) {
		try {
			URLConnection con = getServletConnection("balance");
			OutputStream outstream = con.getOutputStream();
			ObjectOutputStream oos = new ObjectOutputStream(outstream);
			oos.writeObject(aNumber+"&"+pin);
			oos.flush();
			oos.close();
			// receive result from servlet
			InputStream instr = con.getInputStream();
			ObjectInputStream inputFromServlet = new ObjectInputStream(instr);
			String result = (String) inputFromServlet.readObject();
			balance=Double.parseDouble(result);
			inputFromServlet.close();
			instr.close();
		} catch (Exception e) {
			balance = 0;
			e.printStackTrace();
			// TODO: handle exception
		}
	}

	/**
	 * Constructs a bank account with a given balance.
	 * 
	 * @param initialBalance
	 *            the initial balance
	 */
	public BankAccount(double initialBalance) {
		balance = initialBalance;
	}

	/**
	 * Withdraws money from the account.
	 * 
	 * @param the
	 *            amount of money to withdraw
	 */
	public void deposit(double amount,Customer c) {
		try {
			URLConnection con = getServletConnection("deposit");
			OutputStream outstream = con.getOutputStream();
			ObjectOutputStream oos = new ObjectOutputStream(outstream);
			oos.writeObject(amount+"&"+c.getCustomerNumber()+"&"+c.getPin());
			oos.flush();
			oos.close();
			// receive result from servlet
			InputStream instr = con.getInputStream();
			ObjectInputStream inputFromServlet = new ObjectInputStream(instr);
			String result = (String) inputFromServlet.readObject();
			balance+=Double.parseDouble(result);
			inputFromServlet.close();
			instr.close();
		} catch (Exception e) {
			e.printStackTrace();
			// TODO: handle exception
		}
	}

	/**
	 * Deposits money into the account.
	 * 
	 * @param the
	 *            amount of money to deposit
	 */
	public void withdraw(double amount,Customer c) {
		try {
			URLConnection con = getServletConnection("withdraw");
			OutputStream outstream = con.getOutputStream();
			ObjectOutputStream oos = new ObjectOutputStream(outstream);
			oos.writeObject(amount+"&"+c.getCustomerNumber()+"&"+c.getPin());
			oos.flush();
			oos.close();
			// receive result from servlet
			InputStream instr = con.getInputStream();
			ObjectInputStream inputFromServlet = new ObjectInputStream(instr);
			String result = (String) inputFromServlet.readObject();
			balance-=Double.parseDouble(result);
			inputFromServlet.close();
			instr.close();
		} catch (Exception e) {
			e.printStackTrace();
			// TODO: handle exception
		}
	}

	/**
	 * Gets the account balance.
	 * 
	 * @return the account balance
	 */
	public double getBalance() {
		return balance;
	}

	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 double balance;
}