在TOMCAT中使用JNDI连接数据源

1）TOMCAT <Context></Context>中配置 <ResourceParams>节，其中name="jdbc/dataSource"
   就是JNDI名
2）JAVA代码调用
   InitialContext ctx=new InitialContext();
   Context envCtx = (Context)ctx.lookup("java:comp/env");
   DataSource  ds=(DataSource)envCtx.lookup("jdbc/dataSource");
   conn = ds.getConnection();

<ResourceParams name="jdbc/dataSource">
    <parameter>
      <name>factory</name>
      <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
    </parameter>

    <!-- Maximum number of dB connections in pool. Make sure you
         configure your mysqld max_connections large enough to handle
         all of your db connections. Set to 0 for no limit.
         -->
    <parameter>
      <name>maxActive</name>
      <value>100</value>
    </parameter>

    <!-- Maximum number of idle dB connections to retain in pool.
         Set to 0 for no limit.
         -->
    <parameter>
      <name>maxIdle</name>
      <value>30</value>
    </parameter>

    <!-- Maximum time to wait for a dB connection to become available
         in ms, in this example 10 seconds. An Exception is thrown if
         this timeout is exceeded.  Set to -1 to wait indefinitely.
         -->
    <parameter>
      <name>maxWait</name>
      <value>10000</value>
    </parameter>

    <!-- MySQL dB username and password for dB connections  -->
    <parameter>
     <name>username</name>
     <value>ZLGL</value>
    </parameter>
    <parameter>
     <name>password</name>
     <value>ZLGL</value>
    </parameter>

    <!-- Class name for mm.mysql JDBC driver -->
    <parameter>
       <name>driverClassName</name>
       <value>oracle.jdbc.driver.OracleDriver</value>
    </parameter>

    <!-- The JDBC connection url for connecting to your MySQL dB.
         The autoReconnect=true argument to the url makes sure that the
         mm.mysql JDBC Driver will automatically reconnect if mysqld closed the
         connection.  mysqld by default closes idle connections after 8 hours.-->
     
    <parameter>
      <name>url</name>
      <value>jdbc:oracle:thin:ZLGL/ZLGL@192.168.0.166:1521:ZLGL</value>
    </parameter> 
  </ResourceParams>