As easy as invoking the addMeasure(...) from the CrosstabBuilder as many times as measures you need.
The above crosstab was generated with a fragment like this:
DJCrosstab djcross = new CrosstabBuilder()
.setHeight(200)
.setWidth(500)
.setHeaderStyle(mainHeaderStyle)
.setDatasource("sr",DJConstants.DATA_SOURCE_ORIGIN_PARAMETER, DJConstants.DATA_SOURCE_TYPE_COLLECTION)
.setUseFullWidth(true)
.setColorScheme(DJConstants.COLOR_SCHEMA_GRAY)
.setAutomaticTitle(true)
.setCellBorder(Border.PEN_1_POINT)
.addRow("Product Line", "productLine", String.class.getName(),false)
.addColumn("State","state",String.class.getName(),false)
.addColumn("Branch","branch",String.class.getName(),true)
.addColumn("Item", "item", String.class.getName(),true)
.addMeasure("id",Long.class.getName(), DJCalculation.SUM , "Id", measureStyle)
.addMeasure("amount",Float.class.getName(), DJCalculation.SUM , "Amount",measureStyle2)
.setRowStyles(colAndRowHeaderStyle, totalStyle, totalHeaderStyle)
.setColumnStyles(colAndRowHeaderStyle, totalStyle, totalHeaderStyle)
.setCellDimension(34, 60)
.setColumnHeaderHeight(30)
.setRowHeaderWidth(80)
.build();