让你看看我的环境变量里path和classpath的值,然后你做相应的修改就OK啦
classpath = .;D:\JBuilderX\jdk1.4\lib\dt.jar;D:\JBuilderX\jdk1.4\lib\tools.jar;D:\JBuilderX\jdk1.4\lib\mysql-connector-java-3.0.14-production-bin.jar
path = %SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\Microsoft SQL Server\80\Tools\BINN;D:\JBuilderX\jdk1.4\bin;D:\mysql\bin;D:\Tomcat 5.0\bin