一、配置Eclipse与MyEclipse
省略：去网上找相关资料
二、配置Weblogic8.1
省略：去网上找相关资料
三、配置Weblogic8.1的数据源
四、新建Entity Bean
/** *//**
* XDoclet-based CMP 2.x entity bean. This class must be declared * public abstract because the concrete class will * be implemented by the CMP providers tooling. * * To generate EJB related classes using XDoclet: * * - Add Standard EJB module to XDoclet project properties * - Customize XDoclet configuration * - Run XDoclet * * Below are the xdoclet-related tags needed for this EJB. * * @ejb.bean name="Role" //你的Entity Bean的名字 display-name="Role" //在生成ejb-jar.xml时的displayname description="Role" * jndi-name="ejb/Role" //远程访问该EJB是的JNDI名字,这个在调用的时候需要的 type="CMP" //该Entity Bean的类型 cmp-version="2.x" //CMP的版本 view-type="both" //访问该EJB的形式,both表示Local和Remote都支持 primkey-field = "roleId" //在连接数据表时的主键字段 @ejb.persistence table-name = "ROLE" //在连接数据库时数据表名,必须是数据库中名字ejb:util * generate="physical" 
*/public abstract class Role implements EntityBean ...{
/** *//** The entity context */ private EntityContext context; public Role() ...{ // TODO Auto-generated constructor stub
} /** *//** * There are zero or more ejbCreate<METHOD>(...) methods, whose signatures match * the signatures of the create<METHOD>(...) methods of the entity bean?s home interface. * The container invokes an ejbCreate<METHOD>(...) method on an entity bean instance * when a client invokes a matching create<METHOD>(...) method on the entity bean?s * home interface.<br> * * The entity bean provider?s responsibility is to initialize the instance in the ejbCreate< * METHOD>(...) methods from the input arguments, using the get and set accessor * methods, such that when the ejbCreate<METHOD>(...) method returns, the persistent * representation of the instance can be created. <br> * * The entity bean provider must not attempt to modify the values of cmr-fields in an ejbCreate< * METHOD(...) method; this should be done in the ejbPostCreate<METHOD(...) method instead.<br> * * The entity object created by the ejbCreate<METHOD> method must have a unique primary * key. This means that the primary key must be different from the primary keys of all the existing * entity objects within the same home. However, it is legal to reuse the primary key of a previously * removed entity object. The implementation of the bean provider?s ejbCreate< * METHOD>(...) methods should be coded to return a null.<br> * * An ejbCreate<METHOD>(...) method executes in the transaction context determined by * the transaction attribute of the matching create<METHOD>(...) method. * The database insert operations are performed by the container within the same * transaction context after the Bean Provider?s ejbCreate<METHOD>(...) method completes. * * @throws CreateException Thrown if method fails due to system-level error. * * @throws CreateException * * @ejb.create-method */ public Long ejbCreate() throws CreateException ...{ return null; } /** *//** * For each ejbCreate<METHOD>(...) method, there is a matching ejbPostCreate< * METHOD>(...) method that has the same input parameters but whose return type is * void. The container invokes the matching ejbPostCreate<METHOD>(...) method on * an instance after it invokes the ejbCreate<METHOD>(...) method with the same arguments. * The instance can discover the primary key by calling getPrimaryKey() on its * entity context object. <br> * * The entity object identity is available during the ejbPostCreate<METHOD>(...) * method. The instance may, for example, obtain the component interface of the associated entity * object and pass it to another enterprise bean as a method argument.<br> * * The entity Bean Provider may use the ejbPostCreate<METHOD>(...) to set the values * of cmr-fields to complete the initialization of the entity bean instance. * An ejbPostCreate<METHOD>(...) method executes in the same transaction context as * the previous ejbCreate<METHOD>(...) method. * * @throws CreateException Thrown if method fails due to system-level error. */ public void ejbPostCreate() throws CreateException ...{ } public void ejbActivate() throws EJBException, RemoteException ...{ // TODO Auto-generated method stub } public void ejbLoad() throws EJBException, RemoteException ...{ // TODO Auto-generated method stub } public void ejbPassivate() throws EJBException, RemoteException ...{ // TODO Auto-generated method stub } public void ejbRemove() throws RemoveException, EJBException, RemoteException ...{ // TODO Auto-generated method stub } public void ejbStore() throws EJBException, RemoteException ...{ // TODO Auto-generated method stub } /** *//** * Set the associated entity context. The container calls this method * after the instance creation. The entity bean must not attempt to * access its persistent state and relationships using the accessor * methods during this method. <br> * * The enterprise bean instance should store the reference to the context * object in an instance variable. <br> * * This method is called with no transaction context. * * @throws EJBException Thrown if method fails due to system-level error. */ public void setEntityContext(EntityContext newContext) throws EJBException ...{ context = newContext; } /** *//** * Unset the associated entity context. A container invokes this method * before terminating the life of the instance. The entity bean must not * attempt to access its persistent state and relationships using the * accessor methods during this method. <br> * * This method is called with no transaction context. * * @throws EJBException Thrown if method fails due to system-level error. */ public void unsetEntityContext() throws EJBException ...{ context = null; } /** *//** * @ejb.interface-method view-type = "both" * @ejb.persistence column-name = "roleId" //表明该方法所对应的数据表名 * @ejb.pk-field //如果该字段是主键需要加上这么一个字段 * @return */ public abstract Long getRoleId(); /** *//** * @ejb.interface-method view-type = "both" * @param roleId */ public abstract void setRoleId(Long roleId); /** *//** * @ejb.interface-method view-type = "both" * @ejb.persistence column-name = "roleName" * @return */ public abstract String getRoleName(); /** *//** * @ejb.interface-method view-type = "both" * @param roleName */ public abstract void setRoleName(String roleName);}
注：在以上代码中类上面的javadoc红字表示解释和需要自己添加的代码。并且下面方法上面的Javadoc也是需要自己添加的同时这些方法，也得自己动手，丰衣足食（MyEclipse的Entity Bean做的非常不好，几乎什么都要自己添加，大概MyEclipse觉得Entity Bean马上就要被ORM的框架取代了）
以上我们Entity Bean的代码阶段就完成了，下面就是配置Xdoclet
五、配置Xdoclet
version----------8.1（因为我的Weblogic是8.1）
datasource----------刚才在配置weblogic的数据源名
destDir------src/META-INF（就是我们建立工程时src文件夹下面看到的META-INF文件夹）
六、执行Xdoclet
七、测试
测试代码
public static void main(String[] args) ...{ Properties properties = new Properties(); //Weblogic configuration code properties.setProperty(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory"); properties.setProperty(Context.PROVIDER_URL, "t3://localhost:7001"); //t3://localhost:7001 weblogic server address and port try ...{ Context context = new InitialContext(properties); RoleHome roleH = (RoleHome) context.lookup("ejb/Role"); Role role = roleH.findByPrimaryKey(new Long(100001)); System.out.println("the Role Name is " + role.getRoleName()); } catch (NamingException e) ...{ e.printStackTrace(); } catch (RemoteException e) ...{ e.printStackTrace(); } catch (FinderException e) ...{ e.printStackTrace(); } }
|