URL is 
toString()=  file:d:/jdk1.3/docs/api/index.html#chapt1
Protocol  =  file
Host      =  
Port      =  -1
File      =  d:/jdk1.3/docs/api/index.html
Ref       =  chapt1
URL is 
toString()=  http://www.edu.cn/web/myfile.html#chapt1
Protocol  =  http
Host      =  www.edu.cn
Port      =  -1
File      =  /web/myfile.html
Ref       =  chapt1
java.net.MalformedURLException: no protocol: http//www.edu.cn