easyexcel复杂表头导出
/*** @ClassName ColumnWidthStyleStrategy* @Description: excel导出列长度**/
public class ExcelWidthStyleStrategy extends AbstractColumnWidthStyleStrategy {private static final int MAX_COLUMN_WIDTH = 200;private final Map<Integer, Map<Integer, Integer>> CACHE = new HashMap<Integer, Map<Integer, Integer>>(8);@Overrideprotected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<CellData> cellDataList, Cell cell, Head head,Integer relativeRowIndex, Boolean isHead) {boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);if (!needSetWidth) {return;}Map<Integer, Integer> maxColumnWidthMap = CACHE.get(writeSheetHolder.getSheetNo());if (maxColumnWidthMap == null) {maxColumnWidthMap = new HashMap<Integer, Integer>(10);CACHE.put(writeSheetHolder.getSheetNo(), maxColumnWidthMap);}Integer columnWidth = dataLength(cellDataList, cell, isHead);if (columnWidth < 0) {return;}if (columnWidth > MAX_COLUMN_WIDTH) {columnWidth = MAX_COLUMN_WIDTH;}Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());if (maxColumnWidth == null || columnWidth > maxColumnWidth) {maxColumnWidthMap.put(cell.getColumnIndex(), columnWidth);writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), columnWidth * 200);}}private Integer dataLength(List<CellData> cellDataList, Cell cell, Boolean isHead) {if (isHead) {return cell.getStringCellValue().getBytes().length;}CellData cellData = cellDataList.get(0);CellDataTypeEnum type = cellData.getType();if (type == null) {return -1;}switch (type) {case STRING:return cellData.getStringValue().getBytes().length;case BOOLEAN:return cellData.getBooleanValue().toString().getBytes().length;case NUMBER:return cellData.getNumberValue().toString().getBytes().length;default:return -1;}}
}
public static void main(String[] args) {//配置字体,表头背景等HorizontalCellStyleStrategy horizontalCellStyleStrategy = setConfigure();List<List<Object>> lists = new ArrayList<List<Object>>();for(int i = 0 ; i<20 ; i++){List<Object> list = new ArrayList<>();for(int j = 0 ; j<20 ; j++){list.add("测试"+i);}lists.add(list);}try {//设置请求信息(获取HttpServletResponse,可通过HttpServletResponse给导出数据命名)/* response.setContentType("multipart/form-data");response.setCharacterEncoding("utf-8");response.setHeader("Content-disposition", "attachment;filename=sjbkzjap.xlsx");ExcelWriter excelWriter = EasyExcelFactory.getWriter(response.getOutputStream());*/String outPath = "c:/demo.xlsx";File file = new File(outPath);if(file.exists()){// 文件存在file.delete();}ExcelWriter excelWriter = EasyExcelFactory.getWriter(new FileOutputStream(outPath));WriteSheet writeSheet = EasyExcel.writerSheet(0, "sheet").registerWriteHandler(horizontalCellStyleStrategy).registerWriteHandler(new ExcelWidthStyleStrategy()).build();// 创建一个表格WriteTable table = new WriteTable();// 动态添加 表头 headList --> 所有表头行集合//表头数据List<List<String>> headList = setHeadList();table.setHead(headList);excelWriter.write(lists,writeSheet,table);excelWriter.finish();System.out.println("导出成功!");}catch (IOException e){e.printStackTrace();}}//设置表头数据public static List<List<String>> setHeadList(){List<String> headTitle0 = new ArrayList<String>();List<String> headTitle1 = new ArrayList<String>();List<String> headTitle2 = new ArrayList<String>();List<String> headTitle3 = new ArrayList<String>();List<String> headTitle4 = new ArrayList<String>();List<String> headTitle5 = new ArrayList<String>();List<String> headTitle6 = new ArrayList<String>();List<String> headTitle7 = new ArrayList<String>();List<String> headTitle8 = new ArrayList<String>();List<String> headTitle9 = new ArrayList<String>();List<String> headTitle14 = new ArrayList<String>();List<String> headTitle15 = new ArrayList<String>();List<String> headTitle16 = new ArrayList<String>();List<String> headTitle17 = new ArrayList<String>();List<String> headTitle18 = new ArrayList<String>();List<String> headTitle23 = new ArrayList<String>();List<String> headTitle24 = new ArrayList<String>();List<String> headTitle25 = new ArrayList<String>();//设置第一列为项目导出标题headTitle0.add("测试导出");headTitle1.add("测试导出");headTitle2.add("测试导出");headTitle3.add("测试导出");headTitle4.add("测试导出");headTitle5.add("测试导出");headTitle6.add("测试导出");headTitle7.add("测试导出");headTitle8.add("测试导出");headTitle9.add("测试导出");headTitle14.add("测试导出");headTitle15.add("测试导出");headTitle16.add("测试导出");headTitle17.add("测试导出");headTitle18.add("测试导出");headTitle23.add("测试导出");headTitle24.add("测试导出");headTitle25.add("测试导出");headTitle0.add("");headTitle1.add("");headTitle2.add("");headTitle3.add("");headTitle4.add("");headTitle5.add("");headTitle6.add("");headTitle7.add("");headTitle8.add("");headTitle9.add("");headTitle14.add("");headTitle15.add("");headTitle16.add("");headTitle17.add("");headTitle18.add("");headTitle23.add("");headTitle24.add("");headTitle25.add("单位:元");headTitle0.add("编号");headTitle1.add("姓名");headTitle2.add("年龄");headTitle3.add("居住地");headTitle4.add("父亲");headTitle5.add("母亲");headTitle6.add("工作单位");headTitle7.add("工资");headTitle8.add("转正前");headTitle9.add("转正前");headTitle14.add("转正前");headTitle15.add("转正前");headTitle16.add("平均工资");headTitle17.add("转正后");headTitle18.add("转正后");headTitle23.add("转正后");headTitle24.add("转正后");headTitle25.add("平均工资");headTitle0.add("编号");headTitle1.add("姓名");headTitle2.add("年龄");headTitle3.add("居住地");headTitle4.add("父亲");headTitle5.add("母亲");headTitle6.add("工作单位");headTitle7.add("工资");headTitle8.add("第一个月");headTitle9.add("第一个月");headTitle14.add("第二个月");headTitle15.add("第二个月");headTitle16.add("平均工资");headTitle17.add("第一个月");headTitle18.add("第一个月");headTitle23.add("第三个月");headTitle24.add("第三个月");headTitle25.add("平均工资");headTitle0.add("编号");headTitle1.add("姓名");headTitle2.add("年龄");headTitle3.add("居住地");headTitle4.add("父亲");headTitle5.add("母亲");headTitle6.add("工作单位");headTitle7.add("工资");headTitle8.add("日期");headTitle9.add("金额");headTitle14.add("日期");headTitle15.add("金额");headTitle16.add("平均工资");headTitle17.add("日期");headTitle18.add("金额");headTitle23.add("日期");headTitle24.add("金额");headTitle25.add("平均工资");//列数据保存List<List<String>> headList = new ArrayList<List<String>>();headList.add(headTitle0);headList.add(headTitle1);headList.add(headTitle2);headList.add(headTitle3);headList.add(headTitle4);headList.add(headTitle5);headList.add(headTitle6);headList.add(headTitle7);headList.add(headTitle8);headList.add(headTitle9);headList.add(headTitle14);headList.add(headTitle15);headList.add(headTitle16);headList.add(headTitle17);headList.add(headTitle18);//临时插入(可动态获取)List<String> maxList = new ArrayList<String>();List<String> maxList2 = new ArrayList<String>();maxList.add("测试导出");maxList.add("");maxList.add("转正后");maxList.add("第二个月");maxList.add("日期");maxList.add("日期");maxList2.add("测试导出");maxList2.add("");maxList2.add("转正后");maxList2.add("第二个月");maxList2.add("金额");maxList2.add("金额");headList.add(maxList);headList.add(maxList2);headList.add(headTitle23);headList.add(headTitle24);headList.add(headTitle25);return headList;}//配置字体,表头背景等private static HorizontalCellStyleStrategy setConfigure() {// 头的策略WriteCellStyle headWriteCellStyle = new WriteCellStyle();// 背景色headWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());WriteFont headWriteFont = new WriteFont();headWriteFont.setFontHeightInPoints((short) 10);headWriteCellStyle.setWriteFont(headWriteFont);// 内容的策略WriteCellStyle contentWriteCellStyle = new WriteCellStyle();// 字体策略WriteFont contentWriteFont = new WriteFont();// 字体大小contentWriteFont.setFontHeightInPoints((short) 10);contentWriteCellStyle.setWriteFont(contentWriteFont);//边框//导出数据垂直居中contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);//导出数据水平居中contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);contentWriteCellStyle.setBorderLeft(BorderStyle.THIN);contentWriteCellStyle.setBorderTop(BorderStyle.THIN);contentWriteCellStyle.setBorderRight(BorderStyle.THIN);contentWriteCellStyle.setBorderBottom(BorderStyle.THIN);//设置 自动换行contentWriteCellStyle.setWrapped(true);//设置// 这个策略是 头是头的样式 内容是内容的样式 其他的策略可以自己实现return new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);}