Open the files in jsp, help!

i'm trying to call a bean in jsp in order to open a file exists in the same machine as tomcat. but it seems not work properly for no modification occurred to the file after operation on it.
the sample code is shown below:
<%
com.genesys.FileOpr fo=new com.genesys.FileOpr();
fo.open("...");
%>
the routine goes without any exception but either the effect.
what's the problem?!

to see something like a download or so you need to set the outputstream encoding type to the correct mime type (jpeg images: "image/jpeg").
hope you understand it...
greetings

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<urami>
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Open the files in jsp, help!

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