你的classpath 是否包含了msbase.jar、mssqlserver.jar、msutil.jar这三个文件,例如我的Jdbc sql驱动安装路径是C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\;classpath里就要加上 ;C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib\msbase.jar;C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib\mssqlserver.jar;C:\Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib\msutil.jar