spring3 如何配置连接inforMix

环境，tomcat,spring3,informix10在spring中配置如下 <!-- 配置数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close"
p:driverClassName="com.informix.jdbc.IfxDriver"
p:url="jdbc:informixsqli://11.222.22.2222:1521/picc_test:INFORMIXSERVER=ids10"         
p:username="******"
p:password="******" />报错
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class 'com.informix.jdbc.IfxDriver' for connect URL 'jdbc:informixsqli://11.137.76.138:1521/picc_test:INFORMIXSERVER=ids10'
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:656)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)