一、基本操作见： 使用POI导出Excel
二、本次功能需求
给了一个模板，里面有6个sheet页，每页里面都需要填充相应的数据。如图：
三、需求分析
1、分了6个sheet页，每页的数据都不一样，首先代码里要获得它们的数据，然后6个sheet页只能一个个填进去，没法批量操作。
2、如果直接代码创建Excel并画表格样式和数据，那么工程量将会很大，而且会导致代码很乱。我采用的方法是把模板保存到项目里，再通过路径获取到该模板文件，把其内容全部复制到新创建的Excel中，再往里填充数据。
3、注意到第一张图中有总计这一行，我的建议是先在代码中计算出相应的数据，再填充，我也是这样做的。当然，我的第一想法是给它设置函数公式，但是后来我并没有这么做。
4、从第二张图中可以看得出要填充的数据的行是不固定的，除非规定了只填充前几条数据。而在11、12行中的数据是已经有了的，当填充的数据太多，就会覆盖掉那行数据。有两种方法解决，一是把它获取到，先填充数据覆盖掉，再在最后一条数据的下一行把它再填充回去。二是根据数据的总条数通过代码往中间插入空白行。两种方法都可行，我采用了第二种。
四、上代码
1 public void exportAll() { 2 OutputStream out = null; 3 try { 4 // 获取数据 5 List<BaseTalentFlowAnalysisGridVo> talentFlows = this.talentFlowQuestionnaireService.listAnalysis(); 6 List<BaseBasicSituationAnalysisGridVo> basicSituations = this.basicSituationService.listAnalysis(); 7 List<BaseTalentInputAnalysisGridVo> talentInputs = this.talentInputService.listAnalysis(); 8 List<BaseTalentDemandAnalysisGridVo> talentDemands = this.talentDemandService.listAnalysis(); 9 List<BaseHighLevelTalentsRosterAnalysisGridVo> talentRosters = this.rosterService.listAnalysis(); 10 Map<String, Object> results = new HashMap<>(); 11 results.put("talentFlows", talentFlows); 12 results.put("basicSituations", basicSituations); 13 results.put("talentInputs", talentInputs); 14 results.put("talentDemands", talentDemands); 15 results.put("talentRosters", talentRosters); 16 17 // 拿到模板文件 18 String path = ServletActionContext.getServletContext().getRealPath("/"); 19 String filePath = path + "\resources\temp\人才统计报表模板.xls"; 20 FileInputStream tps = new FileInputStream(new File(filePath)); 21 final HSSFWorkbook tpWorkbook = new HSSFWorkbook(tps); 22 out = response.getOutputStream(); 23 response.reset(); 24 response.setHeader("content-disposition", 25 "attachment;filename=" + new String(("人才统计报表").getBytes("gb2312"), "ISO8859-1") + ".xls"); 26 response.setContentType("APPLICATION/msexcel"); 27 // 新建一个Excel的工作空间 28 HSSFWorkbook workbook = new HSSFWorkbook(); 29 // 把模板复制到新建的Excel 30 workbook = tpWorkbook; 31 // 填充数据 32 this.excelService.addData(workbook, results); 33 // 输出Excel内容，生成Excel文件 34 workbook.write(out); 35 } catch (final IOException e) { 36 LOGGER.error(e); 37 } catch (final IllegalArgumentException e) { 38 LOGGER.error(e); 39 } catch (final Exception e) { 40 LOGGER.error(e); 41 } finally { 42 try { 43 // 最后记得关闭输出流 44 response.flushBuffer(); 45 if (out != null) { 46 out.flush(); 47 out.close(); 48 } 49 } catch (final IOException e) { 50 LOGGER.error(e); 51 } 52 } 53 }
1 /** 2 * 第二个sheet页：人才流动情况表 3 * 4 * @param workbook 5 * @param talentFlows 6 */ 7 private void addTalentFlows(HSSFWorkbook workbook, List<BaseTalentFlowAnalysisGridVo> talentFlows) { 8 // 获取第二个sheet页 9 Sheet talentFlowSheet = workbook.getSheetAt(1); 10 Row talentFlowRow = talentFlowSheet.getRow(0); 11 // 声明总计的那几个数据 12 Integer totalLastYearTotal = 0; 13 Integer totalHighLevelTalent = 0; 14 Integer totalUndergraduateAndGraduate = 0; 15 Integer totalCollegeStudents = 0; 16 Integer totalSocialTalent = 0; 17 Integer totalMilitaryTransferCadres = 0; 18 Integer totalReturnees = 0; 19 Integer totalRetirement = 0; 20 Integer totalResignation = 0; 21 Integer totalDismiss = 0; 22 Integer totalOther = 0; 23 Integer totalAverageIncrease = 0; 24 Integer totalAverageReduction = 0; 25 // 循环数据 26 for (BaseTalentFlowAnalysisGridVo baseTalentFlowAnalysisGridVo : talentFlows) { 27 // 循环行 28 for (int tr = 4; tr < 11; tr++) { 29 talentFlowRow = talentFlowSheet.getRow(tr); 30 // 当数据的项目字段和行的第一列内容相等，则把该条数据填入该行 31 if (talentFlowRow.getCell(0).getStringCellValue() 32 .equals(baseTalentFlowAnalysisGridVo.getFkProjectName())) { 33 talentFlowRow.getCell(1).setCellValue(baseTalentFlowAnalysisGridVo.getLastYearTotal()); 34 // 给总计做计算 35 totalLastYearTotal += baseTalentFlowAnalysisGridVo.getLastYearTotal(); 36 talentFlowRow.getCell(2).setCellValue(baseTalentFlowAnalysisGridVo.getHighLevelTalent()); 37 totalHighLevelTalent += baseTalentFlowAnalysisGridVo.getHighLevelTalent(); 38 talentFlowRow.getCell(3).setCellValue(baseTalentFlowAnalysisGridVo.getUndergraduateAndGraduate()); 39 totalUndergraduateAndGraduate += baseTalentFlowAnalysisGridVo.getUndergraduateAndGraduate(); 40 talentFlowRow.getCell(4).setCellValue(baseTalentFlowAnalysisGridVo.getCollegeStudents()); 41 totalCollegeStudents += baseTalentFlowAnalysisGridVo.getCollegeStudents(); 42 talentFlowRow.getCell(5).setCellValue(baseTalentFlowAnalysisGridVo.getSocialTalent()); 43 totalSocialTalent += baseTalentFlowAnalysisGridVo.getSocialTalent(); 44 talentFlowRow.getCell(6).setCellValue(baseTalentFlowAnalysisGridVo.getMilitaryTransferCadres()); 45 totalMilitaryTransferCadres += baseTalentFlowAnalysisGridVo.getMilitaryTransferCadres(); 46 talentFlowRow.getCell(7).setCellValue(baseTalentFlowAnalysisGridVo.getReturnees()); 47 totalReturnees += baseTalentFlowAnalysisGridVo.getReturnees(); 48 talentFlowRow.getCell(8).setCellValue(baseTalentFlowAnalysisGridVo.getRetirement()); 49 totalRetirement += baseTalentFlowAnalysisGridVo.getRetirement(); 50 talentFlowRow.getCell(9).setCellValue(baseTalentFlowAnalysisGridVo.getResignation()); 51 totalResignation += baseTalentFlowAnalysisGridVo.getResignation(); 52 talentFlowRow.getCell(10).setCellValue(baseTalentFlowAnalysisGridVo.getDismiss()); 53 totalDismiss += baseTalentFlowAnalysisGridVo.getDismiss(); 54 talentFlowRow.getCell(11).setCellValue(baseTalentFlowAnalysisGridVo.getOther()); 55 totalOther += baseTalentFlowAnalysisGridVo.getOther(); 56 talentFlowRow.getCell(12).setCellValue(baseTalentFlowAnalysisGridVo.getAverageIncrease()); 57 totalAverageIncrease += baseTalentFlowAnalysisGridVo.getAverageIncrease(); 58 talentFlowRow.getCell(13).setCellValue(baseTalentFlowAnalysisGridVo.getAverageReduction()); 59 totalAverageReduction += baseTalentFlowAnalysisGridVo.getAverageReduction(); 60 break; 61 } 62 } 63 } 64 // 给总计行填充数据 65 talentFlowRow = talentFlowSheet.getRow(11); 66 talentFlowRow.getCell(1).setCellValue(totalLastYearTotal); 67 talentFlowRow.getCell(2).setCellValue(totalHighLevelTalent); 68 talentFlowRow.getCell(3).setCellValue(totalUndergraduateAndGraduate); 69 talentFlowRow.getCell(4).setCellValue(totalCollegeStudents); 70 talentFlowRow.getCell(5).setCellValue(totalSocialTalent); 71 talentFlowRow.getCell(6).setCellValue(totalMilitaryTransferCadres); 72 talentFlowRow.getCell(7).setCellValue(totalReturnees); 73 talentFlowRow.getCell(8).setCellValue(totalRetirement); 74 talentFlowRow.getCell(9).setCellValue(totalResignation); 75 talentFlowRow.getCell(10).setCellValue(totalDismiss); 76 talentFlowRow.getCell(11).setCellValue(totalOther); 77 talentFlowRow.getCell(12).setCellValue(totalAverageIncrease); 78 talentFlowRow.getCell(13).setCellValue(totalAverageReduction); 79 }
1 /** 2 * 第四个sheet页：人才需求情况调查表 3 * 4 * @param workbook 5 * @param talentFlows 6 */ 7 private void addalentDemands(HSSFWorkbook workbook, List<BaseTalentDemandAnalysisGridVo> talentDemands) 8 throws IllegalArgumentException, IllegalAccessException { 9 Sheet talentDemandSheet = workbook.getSheetAt(3); 10 Row talentDemandRow = talentDemandSheet.getRow(4); 11 // 如果数据大于模板中的行数，插入行并复制第一行数据的格式 12 if (talentDemands.size() > 5) { 13 // 插入行，5是模板中已有的行数 14 talentDemandSheet.shiftRows(5, talentDemandSheet.getLastRowNum(), talentDemands.size() - 5, true, false); 15 Row sourceRow = talentDemandSheet.getRow(4); 16 for (int i = 0; i < talentDemands.size() - 5; i++) { 17 Row newRow = talentDemandSheet.createRow(4 + i + 1); 18 newRow.setHeight(sourceRow.getHeight()); 19 for (int j = 0; j < sourceRow.getLastCellNum(); j++) { 20 Cell templateCell = sourceRow.getCell(j); 21 if (templateCell != null) { 22 Cell newCell = newRow.createCell(j); 23 copyCell(templateCell, newCell); 24 } 25 } 26 } 27 } 28 // 填充数据 29 for (int i = 0; i < talentDemands.size(); i++) { 30 talentDemandRow = talentDemandSheet.getRow(4 + i); 31 talentDemandRow.getCell(0).setCellValue(talentDemands.get(i).getPositionTitle()); 32 talentDemandRow.getCell(2).setCellValue(talentDemands.get(i).getDemand()); 33 talentDemandRow.getCell(3).setCellValue(talentDemands.get(i).getAge()); 34 talentDemandRow.getCell(4).setCellValue(talentDemands.get(i).getFkAcademicDegreeName()); 35 talentDemandRow.getCell(5).setCellValue(talentDemands.get(i).getTechnicalTitles()); 36 talentDemandRow.getCell(6).setCellValue(talentDemands.get(i).getProfession()); 37 talentDemandRow.getCell(7).setCellValue(talentDemands.get(i).getFkTalentCategoryName()); 38 talentDemandRow.getCell(8).setCellValue(talentDemands.get(i).getFkServiceFormName()); 39 talentDemandRow.getCell(9).setCellValue(talentDemands.get(i).getProvide()); 40 talentDemandRow.getCell(10).setCellValue(talentDemands.get(i).getOtherCases()); 41 talentDemandRow.getCell(11).setCellValue(talentDemands.get(i).getFkIntentionToChooseName()); 42 } 43 }
五、缺点：一手烂代码，应该给对象设置对应的中文注释，和模板中的列头一样，然后再通过循环填充数据。这样一个个填上去太傻了。
六、通过实验测试，在getCell的时候，如果那是个合并的单元格，那么该单元格的数据存在了左上角，其他的格内容为空。