TOmcat5.0和Tomcat5.5在server.xml的寫法不同如下(來自Tomcat官方網站)
Tomcat5.0

server.xml:

<Context?path="/DBTest"?docBase="DBTest"
????????debug="5"?reloadable="true"?crossContext="true">

??<Logger?className="org.apache.catalina.logger.FileLogger"
?????????????prefix="localhost_DBTest_log."?suffix=".txt"
?????????????timestamp="true"/>

??<Resource?name="jdbc/TestDB"
???????????????auth="Container"
???????????????type="javax.sql.DataSource"/>

??<ResourceParams?name="jdbc/TestDB">
????<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?-1?for?no?limit.??See?also?the?DBCP?documentation?on?this
?????????and?the?minEvictableIdleTimeMillis?configuration?parameter.
?????????-->
????<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>javauser</value>
????</parameter>
????<parameter>
?????<name>password</name>
?????<value>javadude</value>
????</parameter>

????<!--?Class?name?for?the?old?mm.mysql?JDBC?driver?-?uncomment?this?entry?and?comment?next
?????????if?you?want?to?use?this?driver?-?we?recommend?using?Connector/J?though
????<parameter>
???????<name>driverClassName</name>
???????<value>org.gjt.mm.mysql.Driver</value>
????</parameter>
?????-->
????
????<!--?Class?name?for?the?official?MySQL?Connector/J?driver?-->
????<parameter>
???????<name>driverClassName</name>
???????<value>com.mysql.jdbc.Driver</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:mysql://localhost:3306/javatest?autoReconnect=true</value>
????</parameter>
??</ResourceParams>
</Context>

TOmcat5.5-Server.xml
<Context?path="/DBTest"?docBase="DBTest"
????????debug="5"?reloadable="true"?crossContext="true">
??<Resource?name="jdbc/TestDB"?auth="Container"?type="javax.sql.DataSource"
???????????????maxActive="100"?maxIdle="30"?maxWait="10000"
???????????????username="javauser"?password="javadude"?driverClassName="com.mysql.jdbc.Driver"
???????????????url="jdbc:mysql://localhost:3306/javatest?autoReconnect=true"/>

</Context>


在web.xml中的配置都是一樣的:
添加:
<resource-ref>
??????<description>DB?Connection</description>
??????<res-ref-name>jdbc/TestDB</res-ref-name>
??????<res-type>javax.sql.DataSource</res-type>
??????<res-auth>Container</res-auth>
??</resource-ref>

tomcat數據源的配置--摘抄自官方網站