<struts-config>是struts配置文件的根元素，和它对应的配置类为org.apache.struts.config.moduleconfig。它的dtd定义如下：<!element struts-config(data-sources?,form-beans?,global-exceptions?,global-forwards?,action-mappings?,controller?,message-resources*,plugin-in*)。在struts配置文件中，必须按以上dtd指定的先后顺序来配置<struts-config>元素的各个子元素。

一、<data-sources>元素：                                                                                                                                  <data-sources>可包括多个<data-source>元素，<data-source>元素配置形式如下：                                

  <data-source type="org.apache.commons.dbcp.basicdatasource">                                                       <set-property property="autocommit" value="true"/>

<set-property property="driverclass" value="......"/>

<set-property property="url" value="......"/>

<set-property property="maxcount" value="10"/>

<set-property property="mincount" value="2"/>

<set-property property="user" value="....."/>

<set-property property="password" value="......"/>

</data-source>

配置了数据源后，可以通过以下代码访问数据源：

public actionforward
       execute(actionmapping mapping,
               actionform form,
               httpservletrequest request,
               httpservletresponse response) throws exception
{
javax.sql.datasource datasource;
java.sql.connection myconnection;
try {
  datasource = getdatasource(request);
  myconnection = datasource.getconnection();
  // do what you wish with myconnection
} catch (sqlexception sqle) {
    getservlet().log("connection.process", sqle);
} finally {
    //enclose this in a finally block to make
    //sure the connection is closed
    try {
       myconnection.close();
    } catch (sqlexception e) {
       getservlet().log("connection.close", e);
    }
   }
}

当在配置文件中声明多个数据源时，此时需要为每一个数据源分配一个唯一的key 值，通过该值来访问特定的数据源。例如：

data-sources>
   <data-source key="a" type="org.apache.commons.dbcp.basicdatasource">
      ... properties as before ...
   </data-source>
   <data-source key="b" type="org.apache.commons.dbcp.basicdatasource">
      ... properties as before ...
   </data-source>
   ...
</data-sources>

此时可通过如下代码访问数据源：
datasourcea = getdatasource(request, "a");
      datasourceb = getdatasource(request, "b");

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