POI导出Excel时一些合并排版之类
前端时候有这样的需求了，在网上找了下，又查询下javadoc，贴一段代码共享下。POI 3.1 final
import org.apache.poi.hssf.usermodel.*import org.apache.poi.hssf.util.*class ExportModel {String sheetTitle// 复合表头List columnLabel = []List columnLabel2 = []Map columnWidth = [:]// mergeList range = []static final short defaultColumnWidth = 22static final short columnWidthUnit = 35static final short rowHeadFontSize = 12byte[] export(List ll){HSSFWorkbook wb = new HSSFWorkbook()HSSFSheet outputSheet = wb.createSheet(sheetTitle)outputSheet.setDefaultColumnWidth(defaultColumnWidth)// column width settingif(columnWidth){columnWidth.each{k, v ->outputSheet.setColumnWidth((short)k, (short)(columnWidthUnit * v)); }}// headHSSFFont font = wb.createFont()font.setFontHeightInPoints(rowHeadFontSize)font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD)font.setColor(HSSFColor.AQUA.index)HSSFCellStyle style = wb.createCellStyle()style.setFont(font)//style.setFillForegroundColor(HSSFColor.GREY_25_PERCENT.index)//style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND)style.setAlignment(HSSFCellStyle.ALIGN_CENTER)style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER)HSSFRow row = outputSheet.createRow(0)columnLabel.eachWithIndex{label, i ->HSSFCell cell = row.createCell((short)i) cell.setCellValue(label)cell.setCellStyle(style)}if(columnLabel2){HSSFRow row2 = outputSheet.createRow(1)columnLabel2.eachWithIndex{label, i ->HSSFCell cell = row2.createCell((short)i) cell.setCellValue(label)cell.setCellStyle(style)}}if(range){range.each{// row from col from row to col tooutputSheet.addMergedRegion(new Region(it, (short)it, it, (short)it))}}if(ll){int startRow = columnLabel2?2:1for(one in ll){int rowIndex = startRow + ll.indexOf(one)HSSFRow subRow = outputSheet.createRow(rowIndex)one.eachWithIndex{val, i ->HSSFCell cell = subRow.createCell((short)i) cell.setCellValue(val)}}}ByteArrayOutputStream os = new ByteArrayOutputStream()wb.write(os)os.close()return os.toByteArray()}}
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