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| EJB组件的一般方法 |
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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.Stateful;
import javax.ejb.TransactionManagement;
import javax.ejb.TransactionManagementType;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.transaction.UserTransaction;
@Stateful
@TransactionManagement(TransactionManagementType.BEAN)
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName = "EmployeeService", type = PersistenceContextType.EXTENDED)
private EntityManager em;
@Resource
private UserTransaction ut;
public EmployeeBean() {
}
public void doAction() {
Employee emp = new Employee();
emp.setFirstName("first");
em.persist(emp);
}
public <T> T mergeEntity(T entity) {
return em.merge(entity);
}
public <T> T persistEntity(T entity) {
em.persist(entity);
return entity;
}
public <T> T refreshEntity(T entity) {
em.refresh(entity);
return entity;
}
public void removeEntity(Object entity) {
em.remove(em.merge(entity));
}
public void beginTrans()
throws Exception {
ut.begin();
}
public void commitTrans()
throws Exception {
ut.commit();
}
public void rollbackTrans()
throws Exception {
ut.rollback();
}
}
File: EmployeeServiceLocal.java
import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
public void doAction();
<T> T mergeEntity(T entity);
<T> T persistEntity(T entity);
<T> T refreshEntity(T entity);
void removeEntity(Object entity);
void beginTrans() throws Exception;
void commitTrans() throws Exception;
void rollbackTrans() throws Exception;
}
File: EmployeeServiceRemote.java
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote {
public void doAction();
<T> T mergeEntity(T entity);
<T> T persistEntity(T entity);
<T> T refreshEntity(T entity);
void removeEntity(Object entity);
void beginTrans() throws Exception;
void commitTrans() throws Exception;
void rollbackTrans() throws Exception;
}
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.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.beginTrans();
service.doAction();
service.commitTrans();
}
}
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 EJB-EjbWithGenericMethod.zip( 4,489 k) |
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