How to operate in the jsp page HDFS, realize browse , delete files,upload files to the HDFS ?

I want a simple web page , the website has browse , delete , upload, download, button , click the button to achieve the appropriate function, operation HDFS. That is implemented in a web page visualization of HDFS . The method used that way ? Just getting started with HDFS, do not know how to get . Seek expert help to solve , provide relevant information . Thank you very much ! !
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premise you have to build up your hadoop cluster , there are examples of http://download.csdn.net/detail/huixiaopi/4677873 java
front page design of your own slightly
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ask you now to solve this problem?
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I now do not hadoop , and use openstack, openstack do you have a java API do ? I want java API to manipulate openstack. Find api source code ? ?
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LZ good half-hearted , oh. Top of your lungs.
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Oh
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I have to do this , ah, to operate hdfs got stuck jsp , jsp can not pass the file path ah , solution