jndi配置 ：此种配置需要在Tomcat的server.xml中和context.xml中配置数据源，在项目中引用。
前言：需要在tomcat下加入数据库连接的jar包,相关包的下载地址见下方（ojdbc14;c3p0数据源）：
http://download.csdn.net/detail/qq_35624642/9778118
第一步, 找到Tomcat的server.xml中GlobalNamingResources节点,在节点下加一个全局数据源，这里我加了两个数据源。
<!-- 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 name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
<Resource auth="Container"
description="DB Connection"
driverClass="oracle.jdbc.driver.OracleDriver"
maxPoolSize="20"
minPoolSize="5"
acquireIncrement="5"
maxIdleTime="300"
idleConnectionTestPeriod="60"
automaticTestTable="Test"
acquireRetryAttempts="30"
breakAfterAcquireFailure="true"
name="jdbc/amodMonDbSource"
user="amod"
password="amoddb"
factory="org.apache.naming.factory.BeanFactory"
type="com.mchange.v2.c3p0.ComboPooledDataSource"
jdbcUrl="jdbc:oracle:thin:@10.111.0.108:1521:orcl" />
<Resource auth="Container"
description="DB Connection"
driverClass="oracle.jdbc.driver.OracleDriver"
maxPoolSize="20"
minPoolSize="5"
acquireIncrement="5"
maxIdleTime="300"
idleConnectionTestPeriod="60"
automaticTestTable="Test"
acquireRetryAttempts="30"
breakAfterAcquireFailure="true"
name="jdbc/ddamodMonDbSource"
user="ddamod"
password="ddamoddb"
factory="org.apache.naming.factory.BeanFactory"
type="com.mchange.v2.c3p0.ComboPooledDataSource"
jdbcUrl="jdbc:oracle:thin:@10.111.0.108:1521:orcl" />
</GlobalNamingResources>
第二步,找到Tomcat的context.xml,在Context节点下加一个ResourceLink节点对第一步配置的数据源进行引用
<!-- The contents of this file will be loaded for each web application -->
<Context>
<!-- Default set of monitored resources. If one of these changes, the -->
<!-- web application will be reloaded. -->
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<WatchedResource>${catalina.base}/conf/web.xml</WatchedResource>
<!-- Uncomment this to disable session persistence across Tomcat restarts -->
<!--
<Manager pathname="" />
-->
<ResourceLink name="jdbc/amodMonDbSource" global="jdbc/amodMonDbSource" type="javax.sql.DataSource"/>
<ResourceLink name="jdbc/ddamodMonDbSource" global="jdbc/ddamodMonDbSource" type="javax.sql.DataSource"/>
</Context>
第三步,在项目中对配置的数据源进行引用
amoddb.jndi.name=java\:comp/env/jdbc/amodMonDbSource
ddamoddb.jndi.name=java\:comp/env/jdbc/ddamodMonDbSource
root.jndi.name=java\:comp/env/jdbc/amodMonDbSource
null.jndi.name=java\:comp/env/jdbc/dataSourceDB