简述：
配置JNDI 查找Tomcat 中server.xml中定义的数据源
步骤：
1. 修改elipse的数据源server.xml
主要修改如下，
1. 添加下面这段Context文本 其中StudentManagementWeb是项目名称
<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.修改项目的web.xml文件
添加如下字段，用来查找数据源
<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配置文件，其中 mapping resourse 为自定义的model对象
<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查找数据源的配置了
下面是四个文件的完整代码
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
>
<!--
<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).
>
<!-- 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)
>
<!--
<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.
>
<!--
<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
>
<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
>
<!--
<Valve className="org.apache.catalina.authenticator.SingleSignOn" />
-->
<!-- Access log processes all example.
>
<!--
<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>
web.xml
<?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>
hibernate.cfg.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
>
<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>
HibernateUtil.java
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{
new Configuration().configure();
//build Session Factory
catch(Exception e){
"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();
}
}
}
}
