GExcelBuilder

This work is basically fork of public code snippet from blogpost: http://www.technipelago.se/content/technipelago/blog/44 It provide great way read XLS and XLSX in easy Groovy-style syntax.

Groovy builder makes reading Microsoft Excel documents a breeze. F.e. With it you can write the following code to insert customers into your Grails database:

new ExcelBuilder("customers.xls").eachLine([labels:true]) {
    new Person(name:"$firstname $lastname", address:address, telephone:phone).save()
}

If the spreadsheet has no labels on the first row, you can use numeric index to access cells:

new ExcelBuilderX("customers.xlsx").eachLine {
  println "First column on row ${it.rowNum} = ${cell(0)}"
}

In that repository version supports additional xls and xlsx files for the sane way via automatically detection file format in factory like:

ExcelBuilder xls = ExcelBuilder.factory(xlsfile);

which return apropriate builder: ExcelBuilder or ExcelBuilderX and you mostly will not care of differencies.

Added also simple gradle build file.

All feedback welcome.