MyEclipse+Weblogic8.1+Entity Bean

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

1. 启动Weblogic服务器，打开weblogic的后台管理器（http://127.0.0.1:7001/console）
2. 配置Connection Pools，位置：右边菜单树mydomain--Services--JDBC--Connection Pools
3. 配置完Connection Pools后，配置DataSources，位置：右边菜单树mydomain--Services--JDBC-DataSources
4. 记住所配置的DataSources的名字，切记所配置的数据源中的数据库是将来配置Entity Bean时能访问到的表。

四、新建Entity Bean

1. 新建EJB工程。因为是Weblogic8.1所以在选择J2EE版本一定要选择1.3否则就重新建吧
2. 新建Entity Bean。其中包名需要是ejb结尾，否则MyEclipse会warning的。其它设置随便。在选择EJB类型时选择CMP2.X，选择EJB访问形式时，选择both
3. 编辑Entity Bean由于MyEclipse生成的Entity Bean有些设置还没有完全设置好所以需要重新设置
   /***//**
   *XDoclet-basedCMP2.xentitybean.Thisclassmustbedeclared
   *publicabstractbecausetheconcreteclasswill
   *beimplementedbytheCMPproviderstooling.
   *
   *TogenerateEJBrelatedclassesusingXDoclet:
   *
   *-AddStandardEJBmoduletoXDocletprojectproperties
   *-CustomizeXDocletconfiguration
   *-RunXDoclet
   *
   *Belowarethexdoclet-relatedtagsneededforthisEJB.
   *
   *@ejb.beanname="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.persistencetable-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"
   */
   publicabstractclassRoleimplementsEntityBean...{
   
   /***//**Theentitycontext*/
   privateEntityContextcontext;
   
   publicRole()...{
   //TODOAuto-generatedconstructorstub
   }
   
   /***//**
   *TherearezeroormoreejbCreate<METHOD>(...)methods,whosesignaturesmatch
   *thesignaturesofthecreate<METHOD>(...)methodsoftheentitybean?shomeinterface.
   *ThecontainerinvokesanejbCreate<METHOD>(...)methodonanentitybeaninstance
   *whenaclientinvokesamatchingcreate<METHOD>(...)methodontheentitybean?s
   *homeinterface.<br>
   *
   *Theentitybeanprovider?sresponsibilityistoinitializetheinstanceintheejbCreate<
   *METHOD>(...)methodsfromtheinputarguments,usingthegetandsetaccessor
   *methods,suchthatwhentheejbCreate<METHOD>(...)methodreturns,thepersistent
   *representationoftheinstancecanbecreated.<br>
   *
   *Theentitybeanprovidermustnotattempttomodifythevaluesofcmr-fieldsinanejbCreate<
   *METHOD(...)method;thisshouldbedoneintheejbPostCreate<METHOD(...)methodinstead.<br>
   *
   *TheentityobjectcreatedbytheejbCreate<METHOD>methodmusthaveauniqueprimary
   *key.Thismeansthattheprimarykeymustbedifferentfromtheprimarykeysofalltheexisting
   *entityobjectswithinthesamehome.However,itislegaltoreusetheprimarykeyofapreviously
   *removedentityobject.Theimplementationofthebeanprovider?sejbCreate<
   *METHOD>(...)methodsshouldbecodedtoreturnanull.<br>
   *
   *AnejbCreate<METHOD>(...)methodexecutesinthetransactioncontextdeterminedby
   *thetransactionattributeofthematchingcreate<METHOD>(...)method.
   *Thedatabaseinsertoperationsareperformedbythecontainerwithinthesame
   *transactioncontextaftertheBeanProvider?sejbCreate<METHOD>(...)methodcompletes.
   *
   *@throwsCreateExceptionThrownifmethodfailsduetosystem-levelerror.
   *
   *@throwsCreateException
   *
   *@ejb.create-method
   */
   publicLongejbCreate()throwsCreateException...{
   returnnull;
   }
   
   /***//**
   *ForeachejbCreate<METHOD>(...)method,thereisamatchingejbPostCreate<
   *METHOD>(...)methodthathasthesameinputparametersbutwhosereturntypeis
   *void.ThecontainerinvokesthematchingejbPostCreate<METHOD>(...)methodon
   *aninstanceafteritinvokestheejbCreate<METHOD>(...)methodwiththesamearguments.
   *TheinstancecandiscovertheprimarykeybycallinggetPrimaryKey()onits
   *entitycontextobject.<br>
   *
   *TheentityobjectidentityisavailableduringtheejbPostCreate<METHOD>(...)
   *method.Theinstancemay,forexample,obtainthecomponentinterfaceoftheassociatedentity
   *objectandpassittoanotherenterprisebeanasamethodargument.<br>
   *
   *TheentityBeanProvidermayusetheejbPostCreate<METHOD>(...)tosetthevalues
   *ofcmr-fieldstocompletetheinitializationoftheentitybeaninstance.
   *AnejbPostCreate<METHOD>(...)methodexecutesinthesametransactioncontextas
   *thepreviousejbCreate<METHOD>(...)method.
   *
   *@throwsCreateExceptionThrownifmethodfailsduetosystem-levelerror.
   */
   publicvoidejbPostCreate()throwsCreateException...{
   }
   
   publicvoidejbActivate()throwsEJBException,RemoteException...{
   //TODOAuto-generatedmethodstub
   
   }
   
   publicvoidejbLoad()throwsEJBException,RemoteException...{
   //TODOAuto-generatedmethodstub
   
   }
   
   publicvoidejbPassivate()throwsEJBException,RemoteException...{
   //TODOAuto-generatedmethodstub
   
   }
   
   publicvoidejbRemove()
   throwsRemoveException,
   EJBException,
   RemoteException...{
   //TODOAuto-generatedmethodstub
   
   }
   
   publicvoidejbStore()throwsEJBException,RemoteException...{
   //TODOAuto-generatedmethodstub
   
   }
   
   /***//**
   *Settheassociatedentitycontext.Thecontainercallsthismethod
   *aftertheinstancecreation.Theentitybeanmustnotattemptto
   *accessitspersistentstateandrelationshipsusingtheaccessor
   *methodsduringthismethod.<br>
   *
   *Theenterprisebeaninstanceshouldstorethereferencetothecontext
   *objectinaninstancevariable.<br>
   *
   *Thismethodiscalledwithnotransactioncontext.
   *
   *@throwsEJBExceptionThrownifmethodfailsduetosystem-levelerror.
   */
   publicvoidsetEntityContext(EntityContextnewContext)throwsEJBException...{
   context=newContext;
   }
   
   /***//**
   *Unsettheassociatedentitycontext.Acontainerinvokesthismethod
   *beforeterminatingthelifeoftheinstance.Theentitybeanmustnot
   *attempttoaccessitspersistentstateandrelationshipsusingthe
   *accessormethodsduringthismethod.<br>
   *
   *Thismethodiscalledwithnotransactioncontext.
   *
   *@throwsEJBExceptionThrownifmethodfailsduetosystem-levelerror.
   */
   publicvoidunsetEntityContext()throwsEJBException...{
   context=null;
   }
   /***//**
   *@ejb.interface-methodview-type="both"
   *@ejb.persistencecolumn-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
   */
   publicabstractLonggetRoleId();
   
   /***//**
   *@ejb.interface-methodview-type="both"
   *@paramroleId
   */
   publicabstractvoidsetRoleId(LongroleId);
   
   /***//**
   *@ejb.interface-methodview-type="both"
   *@ejb.persistencecolumn-name="roleName"
   *@return
   */
   publicabstractStringgetRoleName();
   
   /***//**
   *@ejb.interface-methodview-type="both"
   *@paramroleName
   */
   publicabstractvoidsetRoleName(StringroleName);
   }
   

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

1. 选择刚才所建立的工程，选择属性。选择工程右击--propertise
2. 配置Xdoclet。刚才的对话框，Myeclipse--Xdoclet。在上面的框中右击选择Add Standard出现对话框，选择Standard EJB
3. 选中刚刚添加的Standard EJB的节点，下面的框中会出现该选项所拥有的列表，选中其中的根节点：ejbdoclet右击Add，在出现的对话框中的选择weblogic
4. 在同样的框中选中刚才添加的weblogic节点，在右边的属性列表中对以下节点进行修改

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

1. 选中工程右击找到MyEclipse菜单项，选中该菜单项下的Run Xdoclet子菜单，这时候Eclipse会执行Xdoclet
2. 等执行完毕后，刚才只有一个文件的包下面会出现一批文件
3. 部署该EJB工程

七、测试

1. 启动Weblogic，启动完成后如果控制后台没有出现EJB部署成功的信息，需要到Weblogic下面重新部署
2. 打开http://127.0.0.1:7001/console，在右菜单mydomain--Deployments--EJB Modules，进行Deploy a new EJB Module...配置
3. 配置成功后，weblogic会提示Deploy成功（可能需要等一会儿）

测试代码

publicstaticvoidmain(String[]args)...{
Propertiesproperties=newProperties();
//Weblogicconfigurationcode
properties.setProperty(Context.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
properties.setProperty(Context.PROVIDER_URL,"t3://localhost:7001");
//t3://localhost:7001weblogicserveraddressandport
try...{
Contextcontext=newInitialContext(properties);
RoleHomeroleH=(RoleHome)context.lookup("ejb/Role");
Rolerole=roleH.findByPrimaryKey(newLong(100001));
System.out.println("theRoleNameis"+role.getRoleName());
}catch(NamingExceptione)...{
e.printStackTrace();
}catch(RemoteExceptione)...{
e.printStackTrace();
}catch(FinderExceptione)...{
e.printStackTrace();
}
}