tomcat 数据源 JNDI

把驱动拷贝到/common/lib下，然后改server.xml和web.xml,
server.xml加如下(</host>里)：
<Context path="/ycportal" docBase="ycportal"
       debug="5" reloadable="true" crossContext="true">
   <Logger className="org.apache.catalina.logger.FileLogger"
            prefix="localhost_DBTest_log." suffix=".txt"
            timestamp="true"/>
   <Resource name="jdbc/webpublish"
              auth="Container"
              type="javax.sql.DataSource"/>
     <ResourceParams name="jdbc/webpublish">
      <parameter>
     <name>factory</name>
     <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
      </parameter>
      <parameter>
    <name>username</name>
    <value>root</value>
      </parameter>
      <parameter>
    <name>password</name>
    <value></value>
      </parameter>
      <parameter>
      <name>driverClassName</name>
      <value>com.mysql.jdbc.Driver</value>
      </parameter>
       <parameter>
     <name>url</name>
     <value>jdbc:mysql://localhost:3306/webpublish?useUnicode=true&characterEncoding=gb2312</value>
    </parameter>
   </ResourceParams>
  </Context>
web.xml:

     <resource-ref>
      <description>DB Connection</description>
      <res-ref-name>jdbc/webpublish</res-ref-name>
      <res-type>javax.sql.DataSource</res-type>
      <res-auth>Container</res-auth>
     </resource-ref>