Read a Excel from OSGI : The Right Approach

I need to read a key value pair (Stored in Excel) in one of the OSGi service.

I am thinking of three approaches:

1. Store the Excel under Resources for Osgi bundle , and read the Excel using :

File file = File.createTempFile("test",".xls");

contentStream=class.getClassLoader().getResourceAsStream("TextExcel"); 

outputStream = new FileOutputStream(file);         

IOUtils.copy(contentStream, outputStream);

And then Parse the Excel to get the Value

2  Similar approach like 1 but store it as XML  and Parse it

3 Convert these Key Value Pairs (Excel) in to JCR Node Structure (It will be about 150 nodes) and then parse the node.

I feel option 1, 2 can consume relatively less number of operations than traversing the JCR nodes.

What should be the right approach for this?