簡述：

配置JNDI 查詢Tomcat 中server.xml中定義的資料來源

步驟：

1. 修改elipse的資料來源server.xml

主要修改如下，

1. 新增下面這段Context文字 其中StudentManagementWeb是專案名稱

      <Context docBase="StudentManagementWeb" path="/StudentManagementWeb" reloadable="true" source="org.eclipse.jst.jee.server:StudentManagementWeb">
      	<Resource name="jdbc/smw" auth="Container" type="javax.sql.DataSource"
		maxActive="100" maxIdle="30" maxWait="10000"
		username="root" password="sql" driverClassName="com.mysql.jdbc.Driver"
		url="jdbc:mysql://localhost:3306/smw"/>
      </Context>
 

2.修改專案的web.xml檔案

新增如下欄位，用來查詢資料來源

  <resource-ref>
	<description>DB Connection</description>
	<res-ref-name>jdbc/smw</res-ref-name>
	<res-type>javax.sql.DataSource</res-type>
	<res-auth>Container</res-auth>
  </resource-ref>

3. 修改Hibernate配置檔案，其中 mapping resourse 為自定義的model物件

	<session-factory>
		<property name="connection.datasource">java:comp/env/jdbc/smw</property>
 		<property name="dialect">
			org.hibernate.dialect.MySQLDialect
		</property>
		<property name="show_sql">true</property><!-- show sql statement -->
		<!-- mapping files -->
		<mapping resource="smw/model/Student.hbm.xml"/>
		<mapping resource="smw/model/CourseSelection.hbm.xml"/>
		<mapping resource="smw/model/Course.hbm.xml"/>
	</session-factory>
 

4. Hibernate的session builder

			Configuration cfg = new Configuration().configure();
			factory = cfg.buildSessionFactory();   //build Session Factory

完成上述四步就做到了JNDI查詢資料來源的配置了

下面是四個檔案的完整程式碼

server.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
--><!-- Note:  A "Server" is not itself a "Container", so you may not
     define subcomponents such as "Valves" at this level.
     Documentation at /docs/config/server.html
 --><Server port="8005" shutdown="SHUTDOWN">

  <!--APR library loader. Documentation at /docs/apr.html -->
  <Listener SSLEngine="on" className="org.apache.catalina.core.AprLifecycleListener"/>
  <!--Initialize Jasper prior to webapps are loaded. Documentation at /docs/jasper-howto.html -->
  <Listener className="org.apache.catalina.core.JasperListener"/>
  <!-- Prevent memory leaks due to use of particular java/javax APIs-->
  <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"/>
  <!-- JMX Support for the Tomcat server. Documentation at /docs/non-existent.html -->
  <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener"/>
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>

  <!-- Global JNDI resources
       Documentation at /docs/jndi-resources-howto.html
  -->
  <GlobalNamingResources>
    <!-- Editable user database that can also be used by
         UserDatabaseRealm to authenticate users
    -->
    <Resource auth="Container" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" name="UserDatabase" pathname="conf/tomcat-users.xml" type="org.apache.catalina.UserDatabase"/>
  </GlobalNamingResources>

  <!-- A "Service" is a collection of one or more "Connectors" that share
       a single "Container" Note:  A "Service" is not itself a "Container", 
       so you may not define subcomponents such as "Valves" at this level.
       Documentation at /docs/config/service.html
   -->
  <Service name="Catalina">
  
    <!--The connectors can use a shared executor, you can define one or more named thread pools-->
    <!--
    <Executor name="tomcatThreadPool" namePrefix="catalina-exec-" 
        maxThreads="150" minSpareThreads="4"/>
    -->
    
    
    <!-- A "Connector" represents an endpoint by which requests are received
         and responses are returned. Documentation at :
         Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
         Java AJP  Connector: /docs/config/ajp.html
         APR (HTTP/AJP) Connector: /docs/apr.html
         Define a non-SSL HTTP/1.1 Connector on port 8080
    -->
    <Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>
    <!-- A "Connector" using the shared thread pool-->
    <!--
    <Connector executor="tomcatThreadPool"
               port="8080" protocol="HTTP/1.1" 
               connectionTimeout="20000" 
               redirectPort="8443" />
    -->           
    <!-- Define a SSL HTTP/1.1 Connector on port 8443
         This connector uses the JSSE configuration, when using APR, the 
         connector should be using the OpenSSL style configuration
         described in the APR documentation -->
    <!--
    <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
               maxThreads="150" scheme="https" secure="true"
               clientAuth="false" sslProtocol="TLS" />
    -->

    <!-- Define an AJP 1.3 Connector on port 8009 -->
    <Connector port="8009" protocol="AJP/1.3" redirectPort="8443"/>


    <!-- An Engine represents the entry point (within Catalina) that processes
         every request.  The Engine implementation for Tomcat stand alone
         analyzes the HTTP headers included with the request, and passes them
         on to the appropriate Host (virtual host).
         Documentation at /docs/config/engine.html -->

    <!-- You should set jvmRoute to support load-balancing via AJP ie :
    <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">         
    --> 
    <Engine defaultHost="localhost" name="Catalina">

      <!--For clustering, please take a look at documentation at:
          /docs/cluster-howto.html  (simple how to)
          /docs/config/cluster.html (reference documentation) -->
      <!--
      <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
      -->        

      <!-- The request dumper valve dumps useful debugging information about
           the request and response data received and sent by Tomcat.
           Documentation at: /docs/config/valve.html -->
      <!--
      <Valve className="org.apache.catalina.valves.RequestDumperValve"/>
      -->

      <!-- This Realm uses the UserDatabase configured in the global JNDI
           resources under the key "UserDatabase".  Any edits
           that are performed against this UserDatabase are immediately
           available for use by the Realm.  -->
      <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>

      <!-- Define the default virtual host
           Note: XML Schema validation will not work with Xerces 2.2.
       -->
      <Host appBase="webapps" autoDeploy="true" name="localhost" unpackWARs="true" xmlNamespaceAware="false" xmlValidation="false">

        <!-- SingleSignOn valve, share authentication between web applications
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
        -->

        <!-- Access log processes all example.
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"  
               prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/>
        -->

      <Context docBase="StudentManagementWeb" path="/StudentManagementWeb" reloadable="true" source="org.eclipse.jst.jee.server:StudentManagementWeb">
      	<Resource name="jdbc/smw" auth="Container" type="javax.sql.DataSource"
		maxActive="100" maxIdle="30" maxWait="10000"
		username="root" password="sql" driverClassName="com.mysql.jdbc.Driver"
		url="jdbc:mysql://localhost:3306/smw"/>
      </Context>
      </Host>
    </Engine>
  </Service>
</Server>

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>StudentManagementWeb</display-name>
  <welcome-file-list>
    <welcome-file>Login.jsp</welcome-file>
  </welcome-file-list>
  
  <resource-ref>
	<description>DB Connection</description>
	<res-ref-name>jdbc/smw</res-ref-name>
	<res-type>javax.sql.DataSource</res-type>
	<res-auth>Container</res-auth>
  </resource-ref>
  
  <context-param> 
    <param-name>log4jConfigLocation</param-name> 
    <param-value>/WEB-INF/log4j.properties</param-value> 
  </context-param> 
  
  <!-- Define LOG4J Listener --> 
  <listener> 
   <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class> 
  </listener> 
  
  <servlet>
  <!-- define the name of Servlet -->
  <servlet-name>dispatcherServlet</servlet-name>
  <!-- Servlet implementation class -->
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <!-- initialize the context -->
  <init-param>
  <param-name>contextConfigLocation</param-name>
  <!-- load configuration -->
  <param-value>/WEB-INF/applicationContext.xml</param-value>
  </init-param>
  <!-- set loading priority -->
  <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  <servlet-name>dispatcherServlet</servlet-name>
  <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
</web-app>

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

	<session-factory>
<!-- 		<property name="dialect">Database Dialect
			org.hibernate.dialect.MySQLDialect
		</property>
		<property name="connection.url">URL of the database
			jdbc:mysql://localhost:3306/smw
		</property>
		<property name="connection.username">root</property>user name
		<property name="connection.password">sql</property>password
		<property name="connection.driver_class">connect driver
			com.mysql.jdbc.Driver
		</property> -->
		<property name="connection.datasource">java:comp/env/jdbc/smw</property>
 		<property name="dialect">
			org.hibernate.dialect.MySQLDialect
		</property>
		<property name="show_sql">true</property><!-- show sql statement -->
		<!-- mapping files -->
		<mapping resource="smw/model/Student.hbm.xml"/>
		<mapping resource="smw/model/CourseSelection.hbm.xml"/>
		<mapping resource="smw/model/Course.hbm.xml"/>
	</session-factory>

</hibernate-configuration>

package smw.utils;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
	private static SessionFactory factory;
	static{
		try{
			Configuration cfg = new Configuration().configure();
			factory = cfg.buildSessionFactory();   //build Session Factory
		}catch(Exception e){
			System.out.println("static of HibernateUtil: " + e.getMessage());
		}
	}
	
	/**
	 * @return SessionFactory
	 */
	public static SessionFactory getSessionFactory(){
		return factory;
	}
	
	/**
	 * get Session
	 * @return Session
	 */
	public static Session getSession(){
		return factory.openSession();
	}
	
	/**
	 * close Session
	 * @param session
	 */
	public static void closeSession(Session session){
		if(session != null){
			if(session.isOpen()){
				session.close();
			}
		}
	}
}