Execute Excel Macros from Java application

We are developing a Java Web application and one of our project features require an excel document to be opened over web page. Once the page (with excel) gets opened a macro should be run automatically and a chart should be shown to user.


Best Solution:
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since excel macro is vb code, since we can make a vb script file called from java and it calls excel macro
Example:
make a script file as content is
Dim objXL
Set objXL = CreateObject("Excel.Application")
With objXL
.Workbooks.Open ("File_Path")
.Application.Run "Macro_Name"
.Application.Quit
End With
Set objXL = Nothing
and save it as calling.vbs
in java you can call it as Runtime.getRuntime().exec("cmd /c start calling.vbs");