Java/EJB3/Injection
Содержание
EJB Tutorial from JBoss: Injection
<source lang="java">
File: CalculatorBean.java /*
* JBoss, Home of Professional Open Source. * Copyright 2006, Red Hat Middleware LLC, and individual contributors * as indicated by the @author tags. See the copyright.txt file in the * distribution for a full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */
package org.jboss.tutorial.injection.bean; import javax.ejb.Stateless; @Stateless public class CalculatorBean implements Calculator {
public int add(int x, int y)
{
return x + y;
}
public int subtract(int x, int y)
{
return x - y;
}
}
File: ShoppingCart.java /*
* JBoss, Home of Professional Open Source. * Copyright 2006, Red Hat Middleware LLC, and individual contributors * as indicated by the @author tags. See the copyright.txt file in the * distribution for a full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */
package org.jboss.tutorial.injection.bean; import java.util.HashMap; import javax.ejb.Remove; public interface ShoppingCart {
void buy(String product, int quantity); HashMap<String, Integer> getCartContents(); @Remove void checkout();
}
File: ShoppingCartBean.java /*
* JBoss, Home of Professional Open Source. * Copyright 2006, Red Hat Middleware LLC, and individual contributors * as indicated by the @author tags. See the copyright.txt file in the * distribution for a full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */
package org.jboss.tutorial.injection.bean; import java.util.HashMap; import javax.ejb.EJB; import javax.ejb.Remote; import javax.ejb.Remove; import javax.ejb.Stateful;
@Stateful @Remote(ShoppingCart.class) public class ShoppingCartBean implements ShoppingCart, java.io.Serializable {
private HashMap<String, Integer> cart = new HashMap<String, Integer>(); @EJB private Calculator calculator;
private Calculator set;
@EJB(beanName="CalculatorBean")
public void setCalculator(Calculator c)
{
set = c;
}
public void buy(String product, int quantity)
{
if (cart.containsKey(product))
{
int currq = cart.get(product);
currq = calculator.add(currq, quantity);
cart.put(product, currq);
}
else
{
cart.put(product, quantity);
}
}
public HashMap<String, Integer> getCartContents()
{
return cart;
}
@Remove
public void checkout()
{
System.out.println("To be implemented");
}
}
File: Calculator.java /*
* JBoss, Home of Professional Open Source. * Copyright 2006, Red Hat Middleware LLC, and individual contributors * as indicated by the @author tags. See the copyright.txt file in the * distribution for a full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */
package org.jboss.tutorial.injection.bean; public interface Calculator {
int add(int x, int y); int subtract(int x, int y);
} File: Client.java /*
* JBoss, Home of Professional Open Source. * Copyright 2006, Red Hat Middleware LLC, and individual contributors * as indicated by the @author tags. See the copyright.txt file in the * distribution for a full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */
package org.jboss.tutorial.injection.client;
import org.jboss.tutorial.injection.bean.ShoppingCart; import javax.naming.InitialContext; import java.util.HashMap; /**
* Comment * * @author
Field Injection
<source lang="java">
File: AnotherBean.java import javax.ejb.Stateless; @Stateless public class AnotherBean implements AnotherBeanLocal {
public void doAnother(){
System.out.println("from another bean");
}
}
File: AnotherBeanLocal.java
public interface AnotherBeanLocal {
public void doAnother();
}
File: Employee.java
import javax.persistence.Entity; import javax.persistence.EntityListeners; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.PostRemove;
@Entity public class Employee implements java.io.Serializable {
private int id;
private String firstName;
private String lastName;
@Id
@GeneratedValue
public int getId() {
return id;
}
@PostRemove
public void postRemove()
{
System.out.println("@PostRemove");
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String first) {
this.firstName = first;
}
public String getLastName() {
return lastName;
}
public void setLastName(String last) {
this.lastName = last;
}
}
File: EmployeeBean.java import javax.annotation.Resource; import javax.ejb.EJB; import javax.ejb.SessionContext; import javax.ejb.Stateless; @Stateless public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
@EJB AnotherBeanLocal a;
public EmployeeBean() {
}
public void doAction() {
System.out.println("doAction");
a.doAnother();
}
}
File: EmployeeServiceLocal.java import java.util.Map; import javax.ejb.Local;
@Local public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import javax.ejb.Remote; @Remote public interface EmployeeServiceRemote {
public void doAction();
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
File: Main.java import javax.ejb.EJB; import javax.naming.InitialContext; public class Main {
public static void main(String[] a) throws Exception {
EmployeeServiceRemote service = null;
// Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
// service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
service.doAction();
}
}
</source>
Setter Injection
<source lang="java">
File: AnotherBean.java import javax.ejb.Stateless; @Stateless public class AnotherBean implements AnotherBeanLocal {
public void doAnother(){
System.out.println("from another bean");
}
}
File: AnotherBeanLocal.java
public interface AnotherBeanLocal {
public void doAnother();
}
File: Employee.java
import javax.persistence.Entity; import javax.persistence.EntityListeners; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.PostRemove;
@Entity public class Employee implements java.io.Serializable {
private int id;
private String firstName;
private String lastName;
@Id
@GeneratedValue
public int getId() {
return id;
}
@PostRemove
public void postRemove()
{
System.out.println("@PostRemove");
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String first) {
this.firstName = first;
}
public String getLastName() {
return lastName;
}
public void setLastName(String last) {
this.lastName = last;
}
}
File: EmployeeBean.java import javax.annotation.Resource; import javax.ejb.EJB; import javax.ejb.SessionContext; import javax.ejb.Stateless; @Stateless public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
private AnotherBeanLocal a;
@EJB
public void setAuditService(AnotherBeanLocal audit) {
this.a = audit;
}
public EmployeeBean() {
}
public void doAction() {
System.out.println("doAction");
a.doAnother();
}
}
File: EmployeeServiceLocal.java import java.util.Map; import javax.ejb.Local;
@Local public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import javax.ejb.Remote; @Remote public interface EmployeeServiceRemote {
public void doAction();
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
File: Main.java import javax.ejb.EJB; import javax.naming.InitialContext; public class Main {
public static void main(String[] a) throws Exception {
EmployeeServiceRemote service = null;
// Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
// service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
service.doAction();
}
}
</source>
Use EJB To Reference Another EJB In One EJB
<source lang="java">
File: AnotherBeanLocal.java
public interface AnotherBeanLocal {
public void doAnother();
}
File: Employee.java
import javax.persistence.Entity; import javax.persistence.EntityListeners; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.PostRemove;
@Entity public class Employee implements java.io.Serializable {
private int id;
private String firstName;
private String lastName;
@Id
@GeneratedValue
public int getId() {
return id;
}
@PostRemove
public void postRemove()
{
System.out.println("@PostRemove");
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String first) {
this.firstName = first;
}
public String getLastName() {
return lastName;
}
public void setLastName(String last) {
this.lastName = last;
}
}
File: EmployeeBean.java import javax.ejb.EJB; import javax.ejb.EJBException; import javax.ejb.Stateless; import javax.naming.Context; import javax.naming.InitialContext; import javax.naming.NamingException; @Stateless @EJB(name = "audit", beanInterface = AnotherBeanLocal.class) public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
public EmployeeBean() {
}
public void doAction() {
System.out.println("doAction");
try {
Context ctx = new InitialContext();
AnotherBeanLocal a = (AnotherBeanLocal) ctx.lookup("java:comp/env/audit");
a.doAnother();
} catch (NamingException e) {
throw new EJBException(e);
}
}
}
File: EmployeeServiceLocal.java import java.util.Map; import javax.ejb.Local;
@Local public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import javax.ejb.Remote; @Remote public interface EmployeeServiceRemote {
public void doAction();
}
File: AnotherBean.java import javax.ejb.Stateless; @Stateless public class AnotherBean implements AnotherBeanLocal {
public void doAnother(){
System.out.println("from another bean");
}
}
File: Main.java import javax.ejb.EJB; import javax.naming.InitialContext; public class Main {
public static void main(String[] a) throws Exception {
EmployeeServiceRemote service = null;
// Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
// service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
service.doAction();
}
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
</source>
Use Injected Context To Loopup An other EJB
<source lang="java">
File: AnotherBeanLocal.java
public interface AnotherBeanLocal {
public void doAnother();
}
File: Employee.java
import javax.persistence.Entity; import javax.persistence.EntityListeners; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.PostRemove;
@Entity public class Employee implements java.io.Serializable {
private int id;
private String firstName;
private String lastName;
@Id
@GeneratedValue
public int getId() {
return id;
}
@PostRemove
public void postRemove()
{
System.out.println("@PostRemove");
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String first) {
this.firstName = first;
}
public String getLastName() {
return lastName;
}
public void setLastName(String last) {
this.lastName = last;
}
}
File: EmployeeBean.java import javax.annotation.Resource; import javax.ejb.EJB; import javax.ejb.SessionContext; import javax.ejb.Stateless; @Stateless @EJB(name = "audit", beanInterface = AnotherBeanLocal.class) public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
@Resource SessionContext context;
public EmployeeBean() {
}
public void doAction() {
System.out.println("doAction");
AnotherBeanLocal a = (AnotherBeanLocal) context.lookup("audit");;
a.doAnother();
}
}
File: EmployeeServiceLocal.java import java.util.Map; import javax.ejb.Local;
@Local public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import javax.ejb.Remote; @Remote public interface EmployeeServiceRemote {
public void doAction();
}
File: AnotherBean.java import javax.ejb.Stateless; @Stateless public class AnotherBean implements AnotherBeanLocal {
public void doAnother(){
System.out.println("from another bean");
}
}
File: Main.java import javax.ejb.EJB; import javax.naming.InitialContext; public class Main {
public static void main(String[] a) throws Exception {
EmployeeServiceRemote service = null;
// Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
// service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");
service.doAction();
}
}
File: jndi.properties java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces java.naming.provider.url=localhost:1099
</source>
