29.4(Shopping Cart Application) Using the techniques you learned in Section 29.8

Question

29.4(Shopping Cart Application) Using the techniques you learned in Section 29.8.2, create a simple shopping cart application. Display a list of books as an h:selectOneRadio element. When the user submits the form, store the user’s selection in a @SessionScoped managed bean. Allow the user to return to the list of books and make additional selections. Provide a link to view the shoppingcart. On the shopping cart page, display the list of selections the user made, the price of each book and the total of all books in the cart.

Explanation / Answer

Code:

Interface
//
package cartbook.ejb;
//imprting utilities
import cartbook.util.bokexceptn;
import java.util.List;
import javax.ejb.Remote;
@Remote//overriding remote
public interface CartBook {//makingcart look interface
    public void lstartf(String cust) throws bokexceptn;
    public void lstartf(//for throwing exceptions
        String cust,
        String custid) throws bokexceptn;
    public void custaddBook(String boktitle);//insering book to cart function
   //book ermoving functoin
    public void custremoveBook(String boktitle) throws bokexceptn;

    public List<String> takeContnt();
   //calling removing function   /
    public void remove();
}

//java class for bookcart
CartBeans.java
package cartbook.ejb;

import cartbook.util.bokexceptn;
import cartbook.util.CustIdlook;
import java.util.ArrayList;
import java.util.List;
import javax.ejb.Remove;
import javax.ejb.Stateful;

@Stateful()
//class definition
public class CarBeans implements Cart {
    List<String> contents;//list type
   //local variables
    String customerId;
    String customerName;
   //checking customer id
    public void lstartf(String cust) throws bokexceptn {
        if (cust == null) {
            throw new bokexceptn("Null cust not allowed.");
        } else {
            customerName = cust;
        }

        customerId = "0";
        contents = new ArrayList<String>();
    }
  
    public void lstartf(
        String cust,
        String custid) throws bokexceptn {
        if (cust == null) {
            throw new bokexceptn("Null cust not allowed.");
        } else {
            customerName = cust;
        }

        CustIdlook idChecker = new CustIdlook();

        if (idChecker.checkin(custid)) {
            customerId = custid;
        } else {
            throw new bokexceptn("Invalid custid: " + custid);
        }

        contents = new ArrayList<String>();
    }
   //functio to add book into cart
    public void custaddBook(String boktitle) {
        contents.add(boktitle);
    }
   //function to remove books
    public void custremoveBook(String boktitle) throws bokexceptn {
        boolean result = contents.remove(boktitle);

        if (result == false) {
            throw new bokexceptn(""" + boktitle + "" not in cart.");
        }
    }

    public List<String> takeContnt() {
        return contents;
    }

    @Remove()//overriding
    public void remove() {
        contents = null;
    }
}

//Util files

package cartbook.util;
//utilities for exceptions

public class bokexceptn extends Exception {
    public bokexceptn() {
    }
    public bokexceptn(String bokmsg) {
        super(bokmsg);
    }
}

//utility 2
package cartbook.util;
public class CustIdlook {
    public CustIdlook() {
    }
   //checkin id utility
    public boolean checkin(String custid) {
        boolean lbool = true;

        for (int li = 0; li < custid.length(); li++) {
            if (Character.isDigit(custid.charAt(li)) == false) {
                lbool = false;
            }
        }
        return lbool;
    }
}

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