1、下载mysql-connector-java-5.0.6-bin.jar文件并放入到Tomcat的common/lib文件夹
2、配置Tomcat的conf/server.xml，在其中增加如下代码：
              <Resource
                           name="jdbc/mysql"
                           type="javax.sql.DataSource"
                           password="ajax"
                           driverClassName="com.mysql.jdbc.Driver"
                           maxIdle="5"
                           maxWait="5000"
                           validationQuery="select 1"
                           username="ajax"
                           url="jdbc:mysql://localhost:3306/ajax"
                           maxActive="15"
                   />
3、配置项目的web.xml(WEB-INF目录)文件，增加如下代码：
                   <resource-ref>
                           <description>DB Connection</description>
                           <res-ref-name>jdbc/mysql</res-ref-name>
                           <res-type>javax.sql.DataSource</res-type>
                           <res-auth>Container</res-auth>
                   </resource-ref>
4、配置项目的context.xml(META-INF目录)文件，增加如下代码：
   可能最初没有此文件，那就创建吧，记得头上加上XML的声明
                <?xml version="1.0" encoding="UTF-8"?>

           <Context>
                   <ResourceLink
                           name="jdbc/mysql"
                           type="javax.sql.DataSource"
                           global="jdbc/mysql" />
           </Context>
5、测试配置，在Servlet中加入：


                   Context env = null;
                   try
                   {
                           env = (Context) new InitialContext().lookup("java:comp/env");
                           pool = (DataSource)env.lookup("jdbc/mysql");
                           if(pool==null)
                                   System.err.println("'DBPool' is an unknown DataSource");
                   }
                   catch(NamingException ne)
                   {
                                   ne.printStackTrace();
                   }