JXLS

http://jxls.sourceforge.net/images/grouping_template.png

http://jxls.sourceforge.net/samples/grouping_example.html

This sample shows how to use grouping with Each-Command .

The Employee class looks like this.

public class Employee {
    private String name;
    private int age;
    private Double payment;
    private Double bonus;

    // getters/setters
    ...}

The report template for this example uses groupBy attribute of Each-Command
to define the grouping.

jx:each(items="employees" groupBy="name" groupOrder="asc" lastCell="D6")

Since the var attribute is missing the default group name _group is used to refer to the grouped collection items

The Java code is listed below

    List employees = generateSampleEmployeeData();
    try(InputStream is = GroupingDemo.class.getResourceAsStream("grouping_template.xlsx")) {
        try (OutputStream os = new FileOutputStream("target/grouping_output.xlsx")) {
            Context context = new Context();
            context.putVar("employees", employees);
            JxlsHelper.getInstance().processTemplate(is, os, context);
        }
    }public static List generateSampleEmployeeData() throws ParseException {
    List employees = new ArrayList();
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MMM-dd", Locale.US);
    employees.add( new Employee("Elsa", dateFormat.parse("1970-Jul-10"), 1500, 0.15) );
    employees.add( new Employee("Oleg", dateFormat.parse("1973-Apr-30"), 2300, 0.25) );
    employees.add( new Employee("John", dateFormat.parse("1970-Jul-10"), 3500, 0.10) );
    employees.add( new Employee("Neil", dateFormat.parse("1975-Oct-05"), 2500, 0.00) );
    employees.add( new Employee("Maria", dateFormat.parse("1978-Jan-07"), 1700, 0.15) );
    employees.add( new Employee("John", dateFormat.parse("1969-May-30"), 2800, 0.20) );
    employees.add( new Employee("Oleg", dateFormat.parse("1988-Apr-30"), 1500, 0.15) );
    employees.add( new Employee("Maria", dateFormat.parse("1970-Jul-10"), 3000, 0.10) );
    employees.add( new Employee("John", dateFormat.parse("1973-Apr-30"), 1000, 0.05) );
    return employees;}

Final report for this example is shown on the following screenshot