1、Tomcat下数据源配置。在conf下新建catalina文件下，再在catalina下新建localhost文件夹。最后在localhost下新建hr.xml，hr.xml内容如下所示（连接的为oracle数据库）。在lib文件夹下放入oracle9ijdbc.jar包。
<Context path="/hr" docBase="E:\workspace\Manager_jh\WebRoot"
                debug="5" reloadable="true" crossContext="true">
                <Resource name="jdbc/oads" auth="Container" type="javax.sql.DataSource"
                             maxActive="100" maxIdle="30" maxWait="10000"
                             username="hr" password="hr"    
                             driverClassName="oracle.jdbc.OracleDriver"
                             url="jdbc:oracle:thin:@192.168.10.3:1521:miaerp"/>
</Context>
2、web.xml配置。在web.xml中配置如下信息，指向数据源。
<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

             <resource-ref>
        <description>oa datasource</description>
        <res-ref-name>jdbc/oads</res-ref-name>
        <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>