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JETT is a Java API that reads an Excel spreadsheet as a template, takes your data, and creates a new Excel spreadsheet that contains your data, formatted as in the template. It works with .xls and .xlsx template spreadsheets.

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package net.sf.jett.expression;

import java.util.ArrayList;
import java.util.List;

import net.sf.jagg.AggregateFunction;
import net.sf.jagg.Aggregations;
import net.sf.jagg.Aggregator;
import net.sf.jagg.model.AggregateValue;

/**
 * A JaggFuncs object is an object that represents jAgg aggregate
 * functionality in the JEXL world.
 *
 * @author Randy Gettman
 */
public class JaggFuncs
{
    /**
     * Have jAgg evaluate an Aggregate Expression.
     * @param values A List of values to aggregate.
     * @param aggSpecString An aggregator specification string, e.g.
     *    "Count(*)", "Sum(quantity)".
     * @return The result of the aggregate operation.
     */
    public static Object eval(List