| 27. 17. 1. 创造你自己的注释 |
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File: EmployeeBean.java |
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import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.transaction.SystemException;
import javax.transaction.TransactionManager;
@Stateless
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName="EmployeeService") private EntityManager manager;
@JndiInjected("java:/TransactionManager")
TransactionManager tm;
public void doAction(){
try {
System.out.println("Is there a transaction: " + (tm.getTransaction() != null));
} catch (SystemException e) {
e.printStackTrace();
}
Customer cust = new Customer();
cust.setLastName("Bond");
cust.setSsn(1L);
manager.persist(cust);
System.out.println("Saved");
cust = manager.find(Customer.class,1L);
System.out.println(cust.getLastName());
cust.setLastName("new name");
manager.persist(cust);
cust = manager.find(Customer.class,1L);
System.out.println(cust.getLastName());
manager.remove(cust);
}
}
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File: EmployeeServiceLocal.java |
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import javax.ejb.Local;
import javax.jws.WebParam;
@Local
public interface EmployeeServiceLocal {
public void doAction();
}
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File: EmployeeServiceRemote.java |
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import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote {
public void doAction();
}
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File: JndiInjected.java |
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import java.lang.annotation.*;
@Target({ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface JndiInjected {
String value();
}
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File: JndiInjector.java |
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import java.lang.reflect.Field;
import java.lang.reflect.Method;
import javax.annotation.PostConstruct;
import javax.ejb.EJBException;
import javax.interceptor.InvocationContext;
import javax.naming.InitialContext;
public class JndiInjector {
@PostConstruct
public void jndiInject(InvocationContext invocation) {
Object target = invocation.getTarget();
Field[] fields = target.getClass().getDeclaredFields();
Method[] methods = target.getClass().getDeclaredMethods();
try {
InitialContext ctx = new InitialContext();
for (Method method : methods) {
JndiInjected inject = method.getAnnotation(JndiInjected.class);
if (inject != null) {
Object obj = ctx.lookup(inject.value());
method.setAccessible(true);
method.invoke(target, obj);
}
}
for (Field field : fields) {
JndiInjected inject = field.getAnnotation(JndiInjected.class);
if (inject != null) {
Object obj = ctx.lookup(inject.value());
field.setAccessible(true);
field.set(target, obj);
}
}
invocation.proceed();
} catch (Exception ex) {
throw new EJBException("Failed to execute @JndiInjected", ex);
}
}
}
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File: Main.java |
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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();
}
}
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File: jndi.properties |
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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
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File: Customer.java |
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import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.Id;
import javax.persistence.PostRemove;
@Entity
public class Customer implements java.io.Serializable {
private String firstName;
private String lastName;
@Id
private long ssn;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public long getSsn() {
return ssn;
}
public void setSsn(long ssn) {
this.ssn = ssn;
}
}
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 Download: EJB-CreateYourOwnAnnotationForEJB.zip( 4,491 k) |