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EJB3.0 + Struts小試

一直想做一個 EJB3.0 結合 Struts 的例子，前天剛好從網上找到了一個相關的 Tutorial ，于是小試了一把，雖然只是完成了 Tutorial 上的一小點功能，但是感覺還是有必要寫下來，免得以后還要再去看別人的Tutorial 。

開發環境：??
??? Eclipse3.2 + WTP1.5 ， JBoss 4.0.3SP1 ， jboss-EJB-3.0_RC5-PFD，MySQL5.0.16
? 環境的搭建可以參考我的學習筆記：
??? EJB 3.0 學習筆記——準備工作 ： http://www.aygfsteel.com/felicity/archive/2006/03/26/37510.html
??? EJB 3.0 學習筆記—— Entity Bean ： http://www.aygfsteel.com/felicity/archive/2006/05/20/47229.html
??? 在MySQL? 中新建數據庫ejbstruts，在JBoss的all\deploy下新建ejbstruts-ds.xml,其內容如下：

新建工程：
?最后的程序會打包成一個EAR部署到JBoss，所以在Eclipse中創建三個新的工程：
??1、EAR Project：EJBStruts???????

選好 Target Runtiem為 JBoss后Finish。

?2、Java EJB3 Project： EJBStrutsEJB
由于WTP1.5還不支持EJB3.0的直接創建，這里新建的是一個普通的Java Project，之后會用ant來創建ejb jar。


由于是普通的Java Project，之后直接Finish好了。


?3、? WEB Project：EJBStrutsWeb


這里可以將工程添加到前面建好的EAR中。


EJB模塊

向EJBStrutsEJB工程中導入User Library：EJB3_JBoss
新建兩個EJB Entities：Book 和Customer

?

/**?*/ /**
?*?Customer.java
? */
package ?com.lzy.library.domain;?

import ?java.io.Serializable;
import ?java.util.ArrayList;
import ?java.util.List;?

import ?javax.persistence.CascadeType;
import ?javax.persistence.Column;
import ?javax.persistence.Entity;
import ?javax.persistence.FetchType;
import ?javax.persistence.GeneratedValue;
import ?javax.persistence.GenerationType;
import ?javax.persistence.Id;
import ?javax.persistence.OneToMany;
import ?javax.persistence.Table;?

/**?*/ /**
?*? @author ?rouserli
?*
? */ ?

@Entity
@Table(name? = ? " CUSTOMER " )
public ? class ?Customer? implements ?Serializable? {
? /**?*/ /**
??*?
?? */
? private ? static ? final ? long ?serialVersionUID? = ? 1L ;?

? private ?Integer?id;?

? private ?String?name;?

? private ?List?books? = ? new ?ArrayList();?

? public ?Customer()? {
?? super ();
?? // ?TODO?Auto-generated?constructor?stub
?} ?

? public ?Customer(Integer?id,?String?name)? {
?? super ();
?? this .id? = ?id;
?? this .name? = ?name;
?} ?

?@Id
?@GeneratedValue(strategy? = ?GenerationType.AUTO)
?@Column(name? = ? " ID " )
? public ?Integer?getId()? {
?? return ?id;
?} ?

? public ? void ?setId(Integer?id)? {
?? this .id? = ?id;
?} ?

?@Column(name? = ? " NAME " )
? public ?String?getName()? {
?? return ?name;
?} ?

? public ? void ?setName(String?name)? {
?? this .name? = ?name;
?} ?

?@OneToMany(cascade? = ?CascadeType.ALL,?fetch? = ?FetchType.EAGER,?mappedBy? = ? " customer " ,?targetEntity? = ?Book. class )
? public ?List?getBooks()? {
?? return ?books;
?} ?

? public ? void ?setBooks(List?books)? {
?? this .books? = ?books;
?} ?

?@Override
? public ?String?toString()? {
?? return ? " Customer:? " ? + ?getId()? + ? " ?Name? " ? + ?getName();
?}
}

在工程下新建 META-INF目錄，該目錄下新建persistence.xml文件。

? <? xml?version="1.0"?encoding="UTF-8" ?>
< persistence >
??? < persistence-unit? name ="test" >
?????? < jta-data-source > java:/EJBStrutsDS </ jta-data-source >
?????? < properties >
??????? < property? name ="hibernate.dialect" ?value ="org.hibernate.dialect.MySQLDialect" /> ???????
???????? < property? name ="hibernate.hbm2ddl.auto" ?value ="update" />
?????? </ properties >
??? </ persistence-unit >
</ persistence >

然后新建DAO接口BookDao（Local）和CustomerDao（Local），以及各自的實現BookDaoImpl（Stateless）和CustomerDaoImpl（Stateless），在后面的Web工程中，將通過這兩個DAO接口進行數據庫操作。由于這部分可供參考的例子很多，略去源碼。

新建文件builder.xml

<? xml?version="1.0" ?> ?

<!-- ?=======================================================================? -->
<!-- ?JBoss?build?file??????????????????????????????????????????????????????? -->
<!-- ?=======================================================================? --> ?

< project? name ="JBoss" ?default ="ejbjar" ?basedir ="." > ?

??? < property? file ="../local.properties" ? />
??? < property? environment ="env" />
??? < property? name ="src.dir" ?value ="${basedir}/src" />
??? < property? name ="jboss.home" ?value ="E:/Programming/Servers/jboss-4.0.3SP1/" />
??? < property? name ="jboss.server.config" ?value ="all" />
??? < property? name ="build.dir" ?value ="${basedir}/build" />
??? < property? name ="build.classes.dir" ?value ="${build.dir}/classes" /> ?

??? <!-- ?Build?classpath? -->
??? < path? id ="classpath" >
?????? <!-- ?So?that?we?can?get?jndi.properties?for?InitialContext? -->
?????? < pathelement? location ="${basedir}" />
?????? < fileset? dir ="${jboss.home}/lib" >
????????? < include? name ="**/*.jar" />
?????? </ fileset >
?????? < fileset? dir ="${jboss.home}/server/${jboss.server.config}/lib" >
????????? < include? name ="**/*.jar" />
?????? </ fileset >
?????? < fileset? dir ="${jboss.home}/server/${jboss.server.config}/deploy/ejb3.deployer" >
????????? < include? name ="*.jar" />
?????? </ fileset >
?????? < fileset? dir ="${jboss.home}/server/${jboss.server.config}/deploy/jboss-aop-jdk50.deployer" >
????????? < include? name ="*.jar" />
?????? </ fileset >
?????? < pathelement? location ="${build.classes.dir}" />
??? </ path > ?

??? < property? name ="build.classpath" ?refid ="classpath" /> ?

??? <!-- ?===================================================================? -->
??? <!-- ?Prepares?the?build?directory???????????????????????????????????????? -->
??? <!-- ?===================================================================? -->
??? < target? name ="prepare" >
?????? < mkdir? dir ="${build.dir}" />
?????? < mkdir? dir ="${build.classes.dir}" />
??? </ target > ?

??? <!-- ?===================================================================? -->
??? <!-- ?Compiles?the?source?code???????????????????????????????????????????? -->
??? <!-- ?===================================================================? -->
??? < target? name ="compile" ?depends ="prepare" >
?????? < javac? srcdir ="${src.dir}"
?????????destdir ="${build.classes.dir}"
?????????debug ="on"
?????????deprecation ="on"
?????????optimize ="off"
?????????includes ="**" >
????????? < classpath? refid ="classpath" />
?????? </ javac >
??? </ target > ?

??? < target? name ="ejbjar" ?depends ="compile" >
?????? < jar? jarfile ="build/EJBStrutsEJB.jar" >
????????? < fileset? dir ="${build.classes.dir}" >
???????????? < include? name ="**/*.class" />
????????? </ fileset >
???????? < fileset? dir ="." >
??????????? < include? name ="META-INF/persistence.xml" />
???????? </ fileset >
?????? </ jar >
?????? < copy? file ="build/EJBStrutsEJB.jar" ?todir ="${jboss.home}/server/${jboss.server.config}/deploy" />
??? </ target > ???

??? < target? name ="clean" >
?????? < delete? dir ="${build.dir}" />
?????? < delete? file ="${jboss.home}/server/${jboss.server.config}/deploy/EJBStrutsEJB.jar" />
??? </ target > ?
</ project >

Ant build后將可以看到EJBStrutsEJB.jar。

Web（struts）模塊：
這部分更加簡單，完成一個最簡單的功能：向數據庫中添加測試數據。 只需要在相應的Action類里得到DAO，然后操作數據庫。

首先將EJBStrutsEJB中的EJBStrutsEJB.jar添加到工程的build path 中：


然后創建相應的Action類：

在src文件夾中新建 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

頁面文件：
welcom.jsp

<% @?page?language = " java " ?contentType = " text/html;?charset=GBK "
?pageEncoding = " GBK " %>
<% @?taglib?uri = " ?http://struts.apache.org/tags-bean? " ?prefix = " bean " %>
<% @?taglib?uri = " ?http://struts.apache.org/tags-html? " ?prefix = " html " %>
<% @?taglib?uri = " ?http://struts.apache.org/tags-tiles? " ?prefix = " tiles " %> ?

<! DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN" > ?
< html >
< head >
< meta? http-equiv ="Content-Type" ?content ="text/html;?charset=GBK" >
< title > navigation </ title >
</ head >
< body >
< table >
? < TR >
??
?? < TD >< html:link? action ="createSampleData" > Create?Sample?Data </ html:link >
?? </ TD >
????
? </ TR >
</ table >
</ body >
</ html > ?

EAR工程打包、部署、運行：
修改application.xml如下:

<? xml?version="1.0"?encoding="UTF-8" ?>
< application? id ="Application_ID" ?version ="1.4" ?xmlns ="http://java.sun.com/xml/ns/j2ee" ?xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance" ?xsi:schemaLocation ="http://java.sun.com/xml/ns/j2eehttp://java.sun.com/xml/ns/j2ee/application_1_4.xsd" >
? < display-name >
?EJBStruts </ display-name >
? < module? id ="WebModule_1155011213937" >
?? < web >
??? < web-uri > EJBStrutsWeb.war </ web-uri >
??? < context-root > EJBStrutsWeb </ context-root >
?? </ web >
? </ module >

?? < module >
???? < ejb > EJBStrutsEJB.jar </ ejb >
?? </ module >
</ application >

確認EAR工程的模塊依賴無誤后Export出ear包。


將導出的EJBStruts.ear文件拷到JBoss的all/deploy目錄下，以all模式啟動JBoss。

確認啟動無誤之后可以在你的瀏覽器中打開welcom.jsp,點擊鏈接，如果執行正確，就會發現數據已經寫入數據庫中。


Reference:
??? EJB 3 Struts Framework Integration Tutorial, by Sebastian Hennebrueder
??? OReilly.Enterprise.JavaBeans.3.0.5th.Edition, by Bill Burke , Richard Monson-Haefel

posted on 2006-08-11 13:52 all gone 閱讀(3069) 評論(0)  編輯  收藏 所屬分類: Java