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The JSF Table component should have an option in the Table Layout window where you could select a checkbox labeled "Show Export to Excel Button". There would also be a text field that would be enabled allowing you to enter a file name for the excel file to be generated. Then when the table displays in a web browser a small button/icon would be clicked that opens a new browser window that generates the same table content with a contentType of 'vnd/excel' (sorry can't remember the exact syntax for the Excel contentType). If the content of the table has been sorted or paginated then the data output to excel should maintain the sorting/pagination (if 10 records are displayed then 10 records are exported to excel). This then might be nice to have a 'export all records to excel' that ignores pagination when exporting.
One reason I added this feature request is that the only thing I get more requests for than displaying data in a table is for providing the ability to export the data to MS Excel (or the OpenOffice equivalent).