再问，Tomcat配置SQLServer连接池问题！！！

我在自己机器上数据库连接是好用的，然后，我把打包的文件放到服务器上的Tomcat的webapps下，lib文件下sqljdbc.jar也加上了，但是，怎么执行都出下面的错误

javax.servlet.ServletException: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.microsoft.sqlserver.jdbc.SQLServerDriver'
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:520)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:427)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
navi_3g.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:79)


原因

org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.microsoft.sqlserver.jdbc.SQLServerDriver'
org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1136)
org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
navi_3g.action.HelloAction.execute(HelloAction.java:79)
org.apache.struts.action.RequestProcessor.processActionPerform(Reques