Jboss3.0-Tomat4.03下Ejb的开发之一(SessionBean的开发)

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从今天开始,给大家说说Jboss3.0下的EJB的开发,首先给大家说的是一个很简单的SessionBean的开法,在此基础上我会慢慢的说在SessionBean如何连接数据库,如何发电子邮件,如何进行事务处理等等。

一、首先你的保证你的系统能正常的运行起动,对EJB有一定的了解。

二、现在所说的EJB都是标准的EJB没有用到Jboss所特有的特性等等。

1、在E:\我建立了E:\JbossEjbTest\jboss\sessionbean\test目录,在下面我写了以下几个文件,一个是Home接口,一个是Remote接口,一个实现Bean,还有ejb-jar.xml和jboss.xml还有build.bat文件和Client测试文件,还有是Run.bat文件等等。

2、Home接口文件TestSessionHome.java
package jboss.sessionbean.test;

import java.io.Serializable;

import java.rmi.RemoteException;

import javax.ejb.CreateException;

import javax.ejb.EJBHome;

public interface TestSessionHome extends EJBHome

{

public TestSession create() throws RemoteException, CreateException;

}

 

3、Remote接口TestSession.java

package jboss.sessionbean.test;

import javax.ejb.EJBObject;

import java.rmi.RemoteException;

 

public interface TestSession extends EJBObject

{

public String getBeanName() throws RemoteException;

}

4、实现Bean类TestSessionBean.java

package jboss.sessionbean.test;

import java.rmi.RemoteException;

import javax.ejb.SessionBean;

import javax.ejb.SessionContext;

public class TestSessionBean implements SessionBean

{

public String getBeanName()throws RemoteException

{

System.out.println ("Someone called `getBeanName!' Method");

return "This Ejb's Nameis SessionBean Test";

}

public TestSessionBean() {}

public void ejbCreate() {}

public void ejbRemove() {}

public void ejbActivate() {}

public void ejbPassivate() {}

public void setSessionContext(SessionContext sc) {}

}

以上是三个最基本的文件,很简单。但一个最简单的测试算是OK了。

接下来的是两个配置文件

1、ejb-jar.xml配置文件

<?xml version="1.0" encoding="iso8859-1"?>

 

<ejb-jar>

  <enterprise-beans>

    <description>JBoss Ejb Test</description>

    <display-name>Test</display-name>

    <session>

      <ejb-name>TestSession</ejb-name>

      <home>jboss.sessionbean.test.TestSessionHome</home>

      <remote>jboss.sessionbean.test.TestSession</remote>

      <ejb-class>jboss.sessionbean.test.TestSessionBean</ejb-class>

      <session-type>Stateless</session-type>

      <transaction-type>Bean</transaction-type>

    </session>

  </enterprise-beans>

</ejb-jar>

 

2、jboss.xml配置文件

 

<?xml version="1.0" encoding="iso8859-1"?>

 

<jboss>

  <enterprise-beans>

     <session>

       <ejb-name>TestSession</ejb-name>

       <jndi-name>TestSessionHomeJndi</jndi-name>//这里是在客户端调用的JNDI名

     </session>

  </enterprise-beans>

</jboss>

下面的是一个Build文件,主要是打包生成jar文件。平时我最喜欢用的是ant工具,不过为了很通用而容易使用,所以写了Bat文件的形式build.bat

set JAVA_HOME=e:\jdk1.3.1

set JBOSS_HOME=e:\Jboss3.0_Tomcat4.03

@echo.

@echo ============== Building JbossEjb ============

@echo.

set JDK_CLASSES=%JAVA_HOME%\lib\tools.jar

set CLASSPATH=.;%JDK_CLASSES%;%JBOSS_HOME%\server\default\lib\jboss-j2ee.jar

set PATH=%JAVA_HOME%\bin;%PATH%

set JAVAC=%JAVA_HOME%\bin\javac

mkdir ejbtemp

mkdir ejbtemp\META-INF

%JAVAC% -d ejbtemp *.java

copy META-INF\*.xml ejbtemp\META-INF

cd ejbtemp

jar vcf TestSession.jar jboss/sessionbean/test/*.class META-INF

jar -tvf TestSession.jar

cd ..

@echo on

@echo.

运行这个批处理文件后在E:\JbossEjbTest\jboss\sessionbean\test目录下生成一个ejbtemp目录在下面有一个TestSession.jar文件,把它放在server\default\deploy目录下会自动发布的。

下面的是客户端测试的两个文件,

TestClient.java文件,这是一个应用形式的java文件,在后我会通过jsp,servlet等各种Client端来测试。

import javax.naming.*;

import javax.rmi.PortableRemoteObject;

import jboss.sessionbean.test.*;

import java.util.*;

 

public class TestClient{

 

public TestClient(){

 

}

public static void main(String[] args) {

Hashtable hash=new Hashtable();

hash.put("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");

hash.put("java.naming.provider.url","localhost:1099");

try{

       InitialContext context = new InitialContext(hash);

Object testObject  = context.lookup("TestSessionHomeJndi");

TestSessionHome testSessionHome = (TestSessionHome)PortableRemoteObject.narrow(testObject,TestSessionHome.class);

TestSession testSession = testSessionHome.create();

System.out.println("Ejb Name:"+testSession.getBeanName());

        }

catch(Exception e)

{

System.out.println(e.toString());

}

 

}

运行和编译的批处理文件Run.bat文件

set JAVA_HOME=e:\jdk1.3.1

set JBOSS_HOME=e:\Jboss3.0_Tomcat4.03

set Program_HOME=E:\JbossEjbTest\jboss\sessionbean\test

@echo.

@echo ============== Building JbossEjb ============

@echo.

set JDK_CLASSES=%JAVA_HOME%\lib\tools.jar

set CLASSPATH=%JDK_CLASSES%;%Program_HOME%\ejbtemp;%JBOSS_HOME%\client\jbosssx-client.jar;%JBOSS_HOME%\client\jboss-client.jar;%JBOSS_HOME%\client\log4j.jar;%JBOSS_HOME%\server\default\lib\jboss-j2ee.jar;%JBOSS_HOME%\client\jnp-client.jar;%JBOSS_HOME%\client\jnet.jar;%JBOSS_HOME%\client\jboss-common-client.jar;

set PATH=%JAVA_HOME%\bin

set JAVAC=%JAVA_HOME%\bin\javac

set JAVA=%JAVA_HOME%\bin\java

%JAVAC% TestClient.java

set CLASSPATH=%CLASSPATH%;.

%JAVA% TestClient

@echo on

@echo.

以上就是这个基本测试所测试的文件,在你进行测试的时候,你可要修改的就是一些路径如JAVA_HOME;JBOSS_HOME;Program_HOME等等,同时这是一个很简单的测试SessinBean的东东,我会在上面的基础上慢慢的扩大,拓展其很多方面的运用。好了,今天就OK到这里了。

SessionBean连接数据库其实和JSP中基本上是一样的。

一、参考前面的配置库配置,建立一个数据库的连接服务。

我的配置文件如下(Oracle)

<?xml version="1.0" encoding="UTF-8"?>

<server>

  <mbean code="org.jboss.resource.connectionmanager.LocalTxConnectionManager" name="jboss.jca:service=LocalTxCM,name=oracleDS">

 

  

    <depends optional-attribute-name="ManagedConnectionFactoryName">

      <!--embedded mbean-->

      <mbean code="org.jboss.resource.connectionmanager.RARDeployment" name="jboss.jca:service=LocalTxDS,name=oracleDS">

 

        <attribute name="JndiName">OracleDS</attribute>

        <attribute name="ManagedConnectionFactoryProperties">

          <properties>

            <config-property name="ConnectionURL" type="java.lang.String">jdbc:oracle:thin:@cuipeng:1521:ora8</config-property>

            <config-property name="DriverClass" type="java.lang.String">oracle.jdbc.driver.OracleDriver</config-property>

            <config-property name="UserName" type="java.lang.String">system</config-property>

            <config-property name="Password" type="java.lang.String">manager</config-property>

          </properties>

        </attribute>

 

        <depends optional-attribute-name="OldRarDeployment">jboss.jca:service=RARDeployment,name=JBoss LocalTransaction JDBC Wrapper</depends>

      </mbean>

    </depends>

    <depends optional-attribute-name="ManagedConnectionPool">

      <!--embedded mbean-->

      <mbean code="org.jboss.resource.connectionmanager.JBossManagedConnectionPool" name="jboss.jca:service=LocalTxPool,name=oracleDS">

 

        <attribute name="MinSize">0</attribute>

        <attribute name="MaxSize">50</attribute>

        <attribute name="BlockingTimeoutMillis">5000</attribute>

        <attribute name="IdleTimeoutMinutes">15</attribute>

 

        <attribute name="Criteria">ByContainer</attribute>

      </mbean>

    </depends>

    <depends optional-attribute-name="CachedConnectionManager">jboss.jca:service=CachedConnectionManager</depends>

 

    <depends optional-attribute-name="JaasSecurityManagerService">jboss.security:service=JaasSecurityManager</depends>

    <attribute name="TransactionManager">java:/TransactionManager</attribute>

    <depends>jboss.jca:service=RARDeployer</depends>

  </mbean>

</server>

二、在前面的远程接口文件TestSession.java加入下面这样的一个方法,当然名字可以自定哦

public Collection getDBTableName() throws RemoteException;

三、在实现的Bean中TestSessionBean.java加入对接口中的方法的实现。

  public Collection getDBTableName() throws RemoteException

       {

              Vector temp=new Vector();

              System.out.println("Jboss SessionBean Connection DB Test");

              try{

                     InitialContext ctx = new InitialContext();

                     DataSource ds = (DataSource) ctx.lookup("java:/OracleDS"); //和前面的对应

                     Connection conn = ds.getConnection();

                     Statement stmt = conn.createStatement();

                     ResultSet rs = stmt.executeQuery("SELECT * FROM TAB");

                     while ( rs.next() ) {

                            temp.addElement(rs.getString("TNAME"));

                     }

                     conn.close();

              }catch(Exception e){

                     System.out.println(e);

              }

              return temp;

       }  

四、在测试的Client端文件TestClient.java中修改为如下:

import javax.naming.*;

import javax.rmi.PortableRemoteObject;

import jboss.sessionbean.test.*;

import java.util.*;

 

public class TestClient{

 

public TestClient(){

 

}

public static void main(String[] args) {

       Hashtable hash=new Hashtable();

       hash.put("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");

       hash.put("java.naming.provider.url","localhost:1099");

       try{

             InitialContext context = new InitialContext(hash);

              Object testObject  = context.lookup("TestSessionHomeJndi");

              TestSessionHome testSessionHome = (TestSessionHome)PortableRemoteObject.narrow(testObject,TestSessionHome.class);

              TestSession testSession = testSessionHome.create();

              System.out.println("Ejb Name:"+testSession.getBeanName());

              Collection col=testSession.getDBTableName();

              Iterator it=col.iterator();

              while(it.hasNext()){

                     String tableName=(String)it.next();

                     System.out.println(tableName);

              }

              }

       catch(Exception e)

       {

              System.out.println(e.toString());

       }

 

}

其余的文件都不需要修改,先运行build.bat文件,然后将生成的Jar文件发布,然后运行client端测试run.bat

接上面,在SessionBean进行电子邮件的发送!

一、参考前面的用JavaMail发电子邮件的配置,建立一个连接。

我的mail-service.xml文件如下:

<?xml version="1.0" encoding="UTF-8"?>

<server>

  <classpath codebase="lib"

             archives="mail.jar, activation.jar, mail-plugin.jar"/>

  <mbean code="org.jboss.mail.MailService"

         name="jboss:service=Mail">

    <attribute name="JNDIName">java:/TestJbossMail</attribute>

    <attribute name="User">lacklhl</attribute>//用户名

    <attribute name="Password">password</attribute>//密码

    <attribute name="Configuration">

<configuration>

<property name="mail.smtp.auth" value="true"/>        

<property name="mail.store.protocol" value="pop3"/>

                 <property name="mail.transport.protocol" value="smtp"/>

                 <property name="mail.user" value="Etre"/>

                 <property name="mail.pop3.host" value="pop3.21cn.com"/>

                 <property name="mail.smtp.host" value="smtp.21cn.com"/>

                 <property name="mail.from" value="[email protected]"/>

                 <property name="mail.debug" value="false"/>

       </configuration>

    </attribute>

  </mbean>

</server>

用的是21cn的免费的邮箱,不过它是需要验证的

二、前面的远程接口文件TestSession.java加入下面这样的一个方法,当然名字可以自定哦

public String sendMail(String from,String to,String subject,String content)throws RemoteException;

三、在实现的Bean中TestSessionBean.java如下。

package jboss.sessionbean.test;

import java.rmi.RemoteException;

import javax.ejb.SessionBean;

import javax.ejb.SessionContext;

import javax.naming.*;

import javax.sql.*;

import java.sql.*;

import java.util.*;

import javax.mail.*;

import javax.mail.internet.*;

public class TestSessionBean implements SessionBean

{

InitialContext ctx;

public String getBeanName()throws RemoteException

       {

              System.out.println ("Someone called `getBeanName!' Method");

              return "This Ejb's Nameis SessionBean Test";

       }

public Collection getDBTableName() throws RemoteException

       {

              Vector temp=new Vector();

              System.out.println("Jboss SessionBean Connection DB Test");

              try{

                      

                     DataSource ds = (DataSource) ctx.lookup("java:/OracleDS");

                     Connection conn = ds.getConnection();

                     Statement stmt = conn.createStatement();

                     ResultSet rs = stmt.executeQuery("SELECT * FROM TAB");

                     while ( rs.next() ) {

                            temp.addElement(rs.getString("TNAME"));

                     }

                     conn.close();

              }catch(Exception e){

                     System.out.println(e);

              }

              return temp;

       }

public String sendMail(String from,String to,String subject,String content)throws RemoteException

       {

       String temp;

       try{

            Session sessions = (Session) ctx.lookup("java:/TestJbossMail");

            MimeMessage msg = new MimeMessage(sessions);

            msg.setFrom(new InternetAddress(from));

            msg.setRecipients(javax.mail.Message.RecipientType.TO,to);

            msg.setSubject(subject);

            msg.setSentDate(new java.util.Date());

            Multipart multipt = new MimeMultipart();

            MimeBodyPart msgbody = new MimeBodyPart();

            msgbody.setContent(content,"text/plain");

            multipt.addBodyPart(msgbody);

            msg.setContent(multipt);

            Transport.send(msg);

            temp="SendMail OK!";

            System.out.println("SendMail OK!");

        }

        catch(Exception e)

        {

            temp="Error:"+e;

            e.printStackTrace();

        }

        return temp;

 

}

public TestSessionBean() {

       }

public void ejbCreate() {

       try{

              ctx = new InitialContext();

       }catch(Exception e){

              System.out.println(e);

       }

}

public void ejbRemove() {}

public void ejbActivate() {}

public void ejbPassivate() {}

public void setSessionContext(SessionContext sc) {}

}

四、Build.bat文件改动如下

set JAVA_HOME=e:\jdk1.3.1

set JBOSS_HOME=e:\Jboss3.0_Tomcat4.03

@echo.

@echo ============== Building JbossEjb ============

@echo.

set JDK_CLASSES=%JAVA_HOME%\lib\tools.jar

set CLASSPATH=.;%JDK_CLASSES%;%JBOSS_HOME%\server\default\lib\jboss-j2ee.jar;%JBOSS_HOME%\server\default\lib\mail.jar

set PATH=%JAVA_HOME%\bin;%PATH%

set JAVAC=%JAVA_HOME%\bin\javac

mkdir ejbtemp

mkdir ejbtemp\META-INF

%JAVAC% -d ejbtemp TestSession*.java

copy *.xml ejbtemp\META-INF

cd ejbtemp

jar vcf TestSession.jar jboss/sessionbean/test/*.class META-INF

jar -tvf TestSession.jar

cd ..

@echo on

@echo.

五、在测试的Client端文件TestClient.java中修改为如下:

import javax.naming.*;

import javax.rmi.PortableRemoteObject;

import jboss.sessionbean.test.*;

import java.util.*;

 

public class TestClient{

 

public TestClient(){

 

}

public static void main(String[] args) {

      Hashtable hash=new Hashtable();

      hash.put("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");

      hash.put("java.naming.provider.url","localhost:1099");

      try{

           InitialContext context = new InitialContext(hash);

            Object testObject  = context.lookup("TestSessionHomeJndi");

            TestSessionHome testSessionHome = (TestSessionHome)PortableRemoteObject.narrow(testObject,TestSessionHome.class);

            TestSession testSession = testSessionHome.create();

            //Test Method

            System.out.println("Ejb Name:"+testSession.getBeanName());

            //Test DB

            Collection col=testSession.getDBTableName();

            Iterator it=col.iterator();

            while(it.hasNext()){

                   String tableName=(String)it.next();

                   System.out.println(tableName);

             }

            //Test Mail

            String temp=testSession.sendMail("[email protected]","[email protected]","Test SessionBean Mail","Test SessionBean Mail");

            System.out.println(temp);

             }

      catch(Exception e)

      {

            System.out.println(e.toString());

      }

 

}

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