如何将百万数据分成多个sheet页？-javaTutorial-php.cn

如何将百万数据分成多个sheet页？

零下一度

Lepaskan： 2017-07-17 15:26:58

asal

2785 orang telah melayarinya

如何将百万数据分成多个sheet页，导出到excel

导出百万数据到excel，很简单，只需要将原来的HSSFWorkbook修改成SXSSFWorkbook，就可以了，但是如果有300w条数据，一下导入一个excel的sheet页中，想想打开excel也需要一段时间吧，慢的话有可能导致程序无法加载，或者直接结束进程的情况发生，或者打开了，那么多数据，看着就头疼，曾看到过一段新闻，这里对老外的毅力也是深表佩服。

这里给出部分代码，供参考研究，分页已实现：

@SuppressWarnings({ "deprecation", "unchecked" })
    @RequestMapping("export-TrainHistoryRecord")
    @ResponseBodyprotected void buildExcelDocument(EmployeeTrainHistoryQuery query,ModelMap model,
            SXSSFWorkbook workbook, HttpServletRequest request,
            HttpServletResponse response) throws Exception {try {
            response.reset();// 获得国际化语言RequestContext requestContext = new RequestContext(request);
            String CourseCompany = requestContext
                    .getMessage("manage-student-trainRecods");
            response.setContentType("APPLICATION/vnd.ms-excel;charset=UTF-8");// 注意，如果去掉下面一行代码中的attachment; 那么也会使IE自动打开文件。            response.setHeader("Content-Disposition","attachment; filename="
                            + java.net.URLEncoder.encode(
                                    DateUtil.getExportDate() + ".xlsx", "UTF-8"));//Excel 扩展名指定为xlsx  SXSSFWorkbook对象只支持xlsx格式OutputStream os = response.getOutputStream();
            CellStyle style = workbook.createCellStyle();// 设置样式style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);//设置单元格着色style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);  //设置单元格填充样式style.setBorderBottom(HSSFCellStyle.BORDER_THIN);//设置下边框style.setBorderLeft(HSSFCellStyle.BORDER_THIN);//设置左边框style.setBorderRight(HSSFCellStyle.BORDER_THIN);//设置右边框style.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 居中//获取国际化文件String employeeCode = requestContext.getMessage("employeeCode");
            String employeeName = requestContext.getMessage("employeeName");
            String orgName = requestContext.getMessage("orgName");
            String startDate = requestContext.getMessage("start.date");
            String endDate = requestContext.getMessage("end.date");
            String courseCode = requestContext.getMessage("courseCode");
            String courseName = requestContext.getMessage("courseName");
            String sessionName = requestContext.getMessage("sessionName");

            List<EmployeeTrainHistoryModel> list = null;try {//查询数据库中共有多少条数据                            query.setTotalItem(employeeTrainHistoryService.fetchCountEmployeeTrainHistoryByQuery(query));                int page_size = 100000;// 定义每页数据数量int list_count =query.getTotalItem();//总数量除以每页显示条数等于页数int export_times = list_count % page_size > 0 ? list_count / page_size+ 1 : list_count / page_size;                     //循环获取产生每页数据for (int m = 0; m < export_times; m++) {
                        query.setNeedQueryAll(false);
                        query.setPageSize(100000);//每页显示多少条数据query.setCurrentPage(m+1);//设置第几页 list=employeeTrainHistoryService.getEmployeeTrainHistoryByQuery(query);//新建sheet Sheet sheet = null;
                            sheet = workbook.createSheet(System.currentTimeMillis()+ CourseCompany+m);// 创建属于上面Sheet的Row，参数0可以是0～65535之间的任何一个，Row header = sheet.createRow(0); // 第0行// 产生标题列，每个sheet页产生一个标题                             Cell cell;
                            String[] headerArr = new String[] { employeeCode, employeeName,
                                    orgName, startDate, endDate, courseCode, courseName, sessionName,
                                    hoursNunber };for (int j = 0; j < headerArr.length; j++) {
                                cell = header.createCell((short) j);
                                cell.setCellStyle(style);
                                cell.setCellValue(headerArr[j]);
                            }// 迭代数据 if (list != null && list.size() > 0) {                                 int rowNum = 1;                                 for (int i = 0; i < list.size(); i++) {
                                     EmployeeTrainHistoryModel history=list.get(i);
                                         sheet.setDefaultColumnWidth((short) 17);
                                     Row row = sheet.createRow(rowNum++);
                                     row.createCell((short) 0).setCellValue(
                                             history.getEmployeeCode());
                                     row.createCell((short) 1).setCellValue(
                                             history.getEmployeeName());
                                     row.createCell((short) 2)
                                             .setCellValue(history.getOrgName());                                     if (history.getTrainBeginTime() != null) {
                                         row.createCell((short) 3).setCellValue(
                                                 DateUtil.toString(history.getTrainBeginTime()));
                                     } else {
                                         row.createCell((short) 3).setCellValue("");
                                     }                                     if (history.getTrainEndTime() != null) {
                                         row.createCell((short) 4).setCellValue(
                                                 DateUtil.toString(history.getTrainEndTime()));
                                     } else {
                                         row.createCell((short) 4).setCellValue("");
                                     }
                                     row.createCell((short) 5).setCellValue(
                                             history.getCourseCode());
                                     row.createCell((short) 6).setCellValue(
                                             history.getCourseName());
                                     row.createCell((short) 7).setCellValue(
                                             history.getSessionName());                                     if (history.getHoursNumber() != null)
                                         row.createCell((short) 8).setCellValue(
                                                 history.getHoursNumber().toString());
                                 }
                             }
                             
                             list.clear();
                         }                            
            } catch (Exception e) {
                e.printStackTrace();
            }try {
                workbook.write(os);
                os.close();
            } catch (Exception e) {// TODO Auto-generated catch block                e.printStackTrace();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

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