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>