Tomcat中Server.xml 
<Context path="/IAIP" docBase="D:\JAVA software\apache-tomcat-6.0.18\apache-tomcat-6.0.18\webapps\IAIP" reloadable="true">
<Resource name="jdbc/iaipDS" auth="Container" type="javax.sql.DataSource"
  driverClassName="oracle.jdbc.driver.OracleDriver" url="jdbc:oracle:thin:@127.0.0.1:1521:SNOW"
  username="iaip" password="iaip" maxActive="20" maxIdle="10" maxWait="10000"/>
</Context>Spring   applicationContext.xml 
<bean id="IAIPDS"
class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName">
<value>java:comp/env/jdbc/iaipDS</value>
</property>
</bean>代码
datasource = (DataSource) initialcontext.lookup("java:comp/env/jdbc/iaipDS");