First Add two jar file
1> commons-dbcp-1.2.x.jar
2> mysql-connector.jar

<data-sources>
<data-source type="org.apache.commons.dbcp.BasicDataSource">
<set-property
property="driverClassName"
value="com.mysql.jdbc.Driver" />
<set-property
property="url"
value="jdbc:mysql:///database_name?autoReconnect=true"; />
<set-property
property="username"
value="username" />
<set-property
property="password"
value="password" />
<set-property
property="maxActive"
value="10" />
<set-property
property="maxWait"
value="5000" />
<set-property
property="defaultAutoCommit"
value="true" />
</data-source>
</data-sources>

put this code into ur struts-config.xml

And in ActionServlet

Create ..
DataSource ds =getDataSource(request);

And then
Connection con =ds.getConnection();