carttestclient1.java~6~

EJB 实例

package ejb;

import javax.naming.*;
import javax.rmi.PortableRemoteObject;
import java.lang.String;
import java.util.Date;
import java.util.List;
import java.util.Calendar;
import java .util.GregorianCalendar;

public class CartTestClient1 {
    private static final String ERROR_NULL_REMOTE = "Remote interface reference is null.  It must be created by calling one of the Home interface methods first.";
    private Cart cart = null;
    private CartHome cartHome = null;

    //Construct the EJB test client
    public CartTestClient1() {
        initialize();
    }

    public void initialize() {

        try {

            //get naming context
            Context context = new InitialContext();
            //look up jndi name
            Object ref = context.lookup("Cart");
            //look up jndi name and cast to Home interface
            cartHome = (CartHome) PortableRemoteObject.narrow(ref, CartHome.class);

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

    }

    //----------------------------------------------------------------------------
    // Methods that use Home interface methods to generate a Remote interface reference
    //----------------------------------------------------------------------------

    public Cart create(String cardHolderName, String creditCardNumber,
                       Date expirationDate) {
        try {
            cart = cartHome.create(cardHolderName, creditCardNumber,
                                   expirationDate);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return cart;
    }

    //----------------------------------------------------------------------------
    // Methods that use Remote interface methods to access data through the bean
    //----------------------------------------------------------------------------

    public void addItem(Item item) {
        if (cart == null) {
            System.out.println("Error in addItem(): " + ERROR_NULL_REMOTE);
            return;
        }

        try {
            cart.addItem(item);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void removeItem(Item item) {
        if (cart == null) {
            System.out.println("Error in removeItem(): " + ERROR_NULL_REMOTE);
            return;
        }

        try {
            cart.removeItem(item);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public List getContents() {
        List returnValue = null;
        if (cart == null) {
            System.out.println("Error in getContents(): " + ERROR_NULL_REMOTE);
            return returnValue;
        }

        try {
            returnValue = cart.getContents();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return returnValue;
    }

    public float getTotalPrice() {
       float returnValue = 0f;
        if (cart == null) {
            System.out.println("Error in getTotalPrice(): " + ERROR_NULL_REMOTE);
            return returnValue;
        }

        try {
            returnValue = cart.getTotalPrice();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return returnValue;
    }

    public void purchase() {
        if (cart == null) {
            System.out.println("Error in purchase(): " + ERROR_NULL_REMOTE);
            return;
        }

        try {
            cart.purchase();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //----------------------------------------------------------------------------
    // Utility Methods
    //----------------------------------------------------------------------------

    public CartHome getHome() {
        return cartHome;
    }
    private static void summarize(Cart cart) throws Exception{
        System.out.println("====================Cart Summary===================");
        List items = cart.getContents();
        for(int i=0,n=items.size();i<n;i++){
            Item current = (Item)items.get(i);
            System.out.println("Price:$"+current.getPrice()+"\t"+current.getType()+"\t"+current.getTitle());
        }
        System.out.println("Total:$"+cart.getTotalPrice());
        System.out.println("====================================================");
    }

    //Main method
    public static void main(String[] args) {
       CartTestClient1 client = new CartTestClient1();
       CartHome home = client.getHome();

       String cardHolderName = "Suzy Programmer";
       String creditCardNumber = "1234-5678-9012-3456";
       Date expirationDate = new GregorianCalendar(2004, Calendar.JULY, 30).getTime();

       Cart cart = null;

       try {
           cart = home.create(cardHolderName, creditCardNumber, expirationDate);
       }   catch (Exception e) {
           System.out.println("Could not create Cart session bean\n" + e);
       }

       Item kassemBook = new Item("J2EE Blueprints", 39.99f, "Book");

       try {
         cart.addItem(kassemBook);
       } catch (Exception e) {
         System.out.println("Could not add the book to the cart\n" + e);
       }

       Item milesAlbum = new Item("Kind of Blue", 11.97f, "CD");

       try {
         cart.addItem(milesAlbum);
       } catch (Exception e) {
         System.out.println("Could not add the CD to the cart\n" + e);
       }

       try {
         summarize(cart);
       } catch (Exception e) {
         System.out.println("Could not summarize the items in the cart\n" + e);
       }

       try {
         cart.removeItem(kassemBook);
       } catch (Exception e) {
         System.out.println("Could not remove the book from the cart\n" + e);
       }

       Item calvertBook = new Item("Charles Calvert's Learn JBuilder 7", 49.95f, "Book");

       try {
         cart.addItem(calvertBook);
       } catch (Exception e) {
         System.out.println("Could not add book to the cart\n" + e);
       }

       try {
         summarize(cart);
       } catch (Exception e) {
         System.out.println("Could not summarize the items in the cart\n" + e);
       }

       try {
         cart.purchase();
       } catch(Exception e) {
         System.out.println("Could not purchase the items:\n" + e);
       }

       try {
         cart.remove();
       } catch(Exception e) {
         System.out.println("Could not remove the Cart bean\n" + e);
       }


        // Use the getHome() method of the client object to call Home interface
        // methods that will return a Remote interface reference.  Then
        // use that Remote interface reference to access the EJB.
    }
}