Remote Interface: Cart
Remote Interface: CartBeanRemote.java
package ejbstateful;
import java.util.Collection;
import javax.ejb.Remote;
@Remote
public interface CartBeanRemote {
public void addItem(String item);
public void removeItem(String item);
public Collection getItems();
}
Stateful Session Bean: CartBean.java
package ejbstateful;
import java.util.ArrayList;
import java.util.Collection;
import javax.annotation.PostConstruct;
import javax.ejb.Stateful;
@Stateful
public class CartBean implements CartBeanRemote {
private ArrayList items;
@PostConstruct
public void initialize() {
items = new ArrayList();
}
public void addItem(String item) {
items.add(item);
}
public void removeItem(String item) {
items.remove(item);
}
public Collection getItems() {
return items;
}
}
EJB Client: CartClient.java
package ejbcart;
import ejbstateful.CartBeanRemote;
import java.util.Collection;
import java.util.Iterator;
import javax.ejb.EJB;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
public class CartClient {
@EJB
private static CartBeanRemote cart;
public CartClient(String[] args) {
}
public static void main(String[] args) throws NamingException {
CartClient client = new CartClient(args);
client.doTest();
}
public void doTest() {
System.out.println("Adding items to cart");
try {
cart.addItem("Apple");
cart.addItem("Peach");
cart.addItem("Grape");
cart.addItem("Kiwi");
System.out.println("Listing cart contents");
Collection items = cart.getItems();
for (Iterator i = items.iterator(); i.hasNext();) {
String item = (String) i.next();
System.out.println(" " + item);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
private static Context getInitialContext() throws NamingException {
return new InitialContext();
}
}
Output:
Adding items to cart
Listing cart contents
Apple
Peach
Grape
Kiwi
(add app-serv-rt.jar(for GlassFish 2.0) in your client project)
Source:
package cart.ejb;
import cart.util.ItemException;
import java.util.List;
import javax.ejb.Remote;
@Remote
public interface CartRemote {
public void initialize(String person) throws ItemException;
public void initialize(
String person,
String id) throws ItemException;
public void addItem(String title);
public void removeItem(String title) throws ItemException;
public List getContents();
public void remove();
}
-----------------------------------------------------------
package cart.ejb;
import cart.util.ItemException;
import java.util.ArrayList;
import java.util.List;
import javax.ejb.Remove;
import javax.ejb.Stateful;
@Stateful
public class Cart implements CartRemote {
List contents;
String customerId;
String customerName;
public void initialize(String person) throws ItemException {
if (person == null) {
throw new ItemException("Null is not allowed.");
} else {
customerName = person; }
customerId = "0";
contents = new ArrayList();
}
public void initialize(
String person,
String id) throws ItemException {
if (person == null) {
throw new ItemException("Null is not allowed.");
} else {
customerName = person; }
contents = new ArrayList();
}
public void addItem(String item) {
contents.add(item);
}
public void removeItem(String item) throws ItemException {
boolean result = contents.remove(item);
if (result == false) {
throw new ItemException("An item \"" + item + "\" not found in the cart to remove");
}
}
public List getContents() {
return contents;
}
@Remove()
public void remove() {
contents = null;
}
}
------------------------------------------------------
package cart.client;
import java.util.Iterator;
import java.util.List;
import javax.ejb.EJB;
import cart.ejb.CartRemote;
import cart.util.ItemException;
public class CartClient {
@EJB
private static CartRemote cart;
public CartClient(String[] args) {
}
/**@param args the command line arguments */
public static void main(String[] args) {
CartClient client = new CartClient(args);
client.doTest();
}
public void doTest() {
try {
cart.initialize("Kanchan", "100");
//cart.addItem("Pizza");
cart.addItem("Noodles");
cart.addItem("Rice");
cart.addItem("Chicken");
List bookList = cart.getContents();
bookList = cart.getContents();
Iterator iterator = bookList.iterator();
while (iterator.hasNext()) {
String itemName = iterator.next();
System.out.println("Fetch an item from cart: " + itemName);
}
System.out.println("Deleting \"Pizza\" from cart.");
cart.removeItem("Pizza");
cart.remove();
System.exit(0);
} catch (ItemException ex) {
System.err.println("Caught a ItemException: " + ex.getMessage());
System.exit(1);
} catch (Exception ex) {
System.err.println("Caught an unexpected exception!");
ex.printStackTrace();
System.exit(1);
}
}
}
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