小弟遇到JDBC方面的问题解决不了，求助
java.lang.ClassNotFoundException:   com.microsoft.jdbc.sqlserver.SQLServerDriverconn   error...
fffffdddddeeeeeeeTue   Apr   03   23:32:44   CST   20072007-4-3   23:32:45   org.apache.catalina.core.StandardWrapperValve   invoke
严重:   Servlet.service()   for   servlet   jsp   threw   exception
java.lang.NullPointerException
at   org.apache.jsp.save_jsp._jspService(save_jsp.java:94)
at   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
at   javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
at   org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
at   org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
at   javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at   org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at   org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at   org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
at   org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at   org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at   org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at   org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at   org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at   org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
at   org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at   org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at   org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at   org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at   java.lang.Thread.run(Unknown   Source)
我不明白为什么报了：java.lang.ClassNotFoundException:   com.microsoft.jdbc.sqlserver.SQLServerDriverconn   error...这样的错啊。我用的是myeclipse，JDBC那3个jar包我已经导入项目了，连接的代码我测试过了，没有问题。

ConnectBean.java
package   com.liuyanban;


import   java.sql.DriverManager;
import   java.util.Properties;
import   java.sql.Connection;

public   class   ConnectBean{
                private   String   driver= "com.microsoft.jdbc.sqlserver.SQLServerDriver ";//SQL的驱动
                private   String   url= "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=jade ";//连接数据源
                private   String   user= "sa ";//用户名
                private   String   password= " ";//密码

                public   Connection   getConnection(){
            &nb