easyexcel-获取文件资源和导入导出excel

1、获取本地资源文件，根据模板填充数据导出

public void exportExcel(HttpServletResponse httpResponse, @RequestBody AssayReportDayRecordQuery query) {
        AssayReportDayRecordDTO dto = this.queryByDate(query);
        ExcelWriter excelWriter = null;
        ExcelUtil.configResponse(httpResponse);
        // 模板注意 用{} 来表示你要用的变量 如果本来就有"{","}" 特殊字符 用"\{","\}"代替
        // {} 代表普通变量 {.} 代表是list的变量 {前缀.} 前缀可以区分不同的list
        InputStream inputStream = null;
        File reportFile = null;
        try {
            inputStream = new ClassPathResource("classpath:template/" + query.getTemplateCode() + ".xls").getInputStream();
            reportFile = new File(query.getTemplateCode() + ".xls");
            FileUtils.copyInputStreamToFile(inputStream, reportFile);
            excelWriter = EasyExcel.write(httpResponse.getOutputStream()).withTemplate(reportFile.getPath()).build();
            WriteSheet writeSheet = EasyExcel.writerSheet().build();
            // 简单的说 如果你的模板有list,且list不是最后一行，下面还有数据需要填充 就必须设置 forceNewRow=true 但是这个就会把所有数据放到内存
            FillConfig fillConfig = FillConfig.builder().forceNewRow(Boolean.TRUE).direction(WriteDirectionEnum.VERTICAL).build();
            //填充列表数据
            if (org.apache.commons.collections4.CollectionUtils.isNotEmpty(dto.getDataList())) {
                excelWriter.fill(dto.getDataList(), fillConfig, writeSheet);
            }
        } catch (Exception e) {
            log.error("导出异常：{}", e.getMessage());
        } finally {
            if (Objects.nonNull(reportFile) && reportFile.exists()) {
                boolean delete = reportFile.delete();
                log.info("文件删除" + (delete ? "成功" : "失败"));
            }
            // 千万别忘记close 会帮忙关闭流
            if (excelWriter != null) {
                excelWriter.finish();
                try {
                    inputStream.close();
                } catch (IOException e) {
                    log.error("文件流异常", e);
                }
            }
        }
    }

2、根据实体类导出，实体类做表头

public void generateDeviceExcel(Page<DeviceEntityVO> page, HttpServletResponse response) {
        List<DeviceEntityExcel> excels = new ArrayList<>();
        for (DeviceEntityVO vo : page) {
            DeviceEntityExcel excel = new DeviceEntityExcel();
            excel.setDeviceName(vo.getDeviceName());
            excel.setDeviceId(vo.getAssetsCode());
            excel.setCatalogue(vo.getCatalogue());
            excel.setCatalogueLeaf(vo.getCatalogueLeaf());
            excel.setModel(vo.getModel());
            excel.setManufactorName(vo.getManufactorName());
            excel.setUnit(vo.getUnit());
            excel.setDeviceGrade(vo.getDeviceGrade());
            excel.setDeviceStatusName(DeviceEntityStatus.getMessage(vo.getDeviceStatus()));
            excel.setCreateTime(vo.getCreateTime());
            excels.add(excel);
        }
        ExcelUtil.generateExcel(response, DeviceEntityExcel.class, excels);
    }

@Data
public class DeviceEntityExcel {

    @ApiModelProperty(value="设备资产名称", position=2)
    @ExcelProperty("设备资产名称")
    private String deviceName;
    /**
     * 设备资产编号
     */
    @ApiModelProperty(value="设备资产编号", position=4)
    @ExcelProperty("设备资产编号")
    private String deviceId;

    @ApiModelProperty("设备分类")
    @ExcelProperty("设备分类")
    private String catalogue;

    @ApiModelProperty("细分种类")
    @ExcelProperty("细分种类")
    private String catalogueLeaf;

    /**
     * 设备型号
     */
    @ApiModelProperty(value="设备型号", position=2)
    @ExcelProperty("设备型号")
    private String model;


    @ApiModelProperty("生产厂商")
    @ExcelProperty("生产厂商")
    private String manufactorName;


    @ApiModelProperty("单位")
    @ExcelProperty("单位")
    private String unit;

    /**
     * 等级
     */
    @ApiModelProperty(value="等级", position=4)
    @ExcelProperty("等级")
    private String deviceGrade;

    @ApiModelProperty("状态")
    @ExcelProperty("状态")
    private String deviceStatusName;

    @ApiModelProperty("创建时间")
    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    @JSONField(format = "yyyy-MM-dd HH:mm:ss")
    @ExcelProperty("创建时间")
    private Date createTime;
}

@Slf4j
public class ExcelUtil {
    public static void configResponse(HttpServletResponse response) {
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        response.setCharacterEncoding("utf8");
        response.setHeader("Content-Disposition", "attachment; filename=" + System.currentTimeMillis() + ".xlsx");
        response.setHeader("Pragma", "public");
        response.setHeader("Cache-Control", "no-store");
        response.addHeader("Cache-Control", "max-age=0");
    }

    /**
     * 生成excel
     *
     * @param response
     * @param head
     * @param data
     */
    public static void generateExcel(HttpServletResponse response, Class head, List data) {
        ExcelUtil.generateExcel(response, head, data, "报表");

    }

    public static void generateExcel(HttpServletResponse response, Class head, List data, String sheetName) {
        ExcelUtil.configResponse(response);
        try {
            Map<Integer, String[]> map = DownloadTemplateUtil.downloadTemplate(head);
            EasyExcelFactory.write(response.getOutputStream(), head).autoCloseStream(Boolean.TRUE).registerWriteHandler(new ExportCellWriteHandler(map)).sheet(sheetName).doWrite(data);
        } catch (IOException e) {
//            e.printStackTrace();
            log.error("generateExcel{}",e.getMessage());
        }
    }

    /**
     * 生成excel（公共简易excel导出）
     *
     * @param response
     * @param head
     * @param data
     */
    public static void generateCommonExcel(HttpServletResponse response, Class head, List data, String sheetName) {
        ExcelUtil.configResponse(response);
        try {
            EasyExcelFactory.write(response.getOutputStream()).registerWriteHandler(new LongestMatchColumnWidthStyleStrategy()).head(head).autoCloseStream(Boolean.TRUE).sheet(sheetName).doWrite(data);
        } catch (IOException e) {
            log.error("ExcelUtil->generateCommonExcel", e);
        }
    }

    /**
     * 生成excel带下拉框
     *
     * @param response
     * @param head
     * @param data
     */
    public static void generateExcelWithSelect(HttpServletResponse response, Class head, List data, String[] select) {
        ExcelUtil.configResponse(response);
        try {
            EasyExcelFactory.write(response.getOutputStream(), head).registerWriteHandler(
                    new SheetWriteHandler() {
                        @Override
                        public void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
                            //不需要处理
                        }

                        @Override
                        public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
                            if (select.length > 0) {
                                //通过sheet处理下拉信息
                                Sheet sheet = writeSheetHolder.getSheet();
                                DataValidationHelper helper = sheet.getDataValidationHelper();
                                CellRangeAddressList rangeList = new CellRangeAddressList();
                                CellRangeAddress addr = new CellRangeAddress(1, data.size(), 2, 2);
                                rangeList.addCellRangeAddress(addr);
                                DataValidationConstraint constraint = helper.createExplicitListConstraint(select);
                                DataValidation validation = helper.createValidation(constraint, rangeList);
                                sheet.addValidationData(validation);
                            }
                        }
                    }
            ).autoCloseStream(Boolean.TRUE).sheet("报表").doWrite(data);
        } catch (IOException e) {
            log.error("ExcelUtil -> generateExcelWithSelect()，异常：{}", e.getMessage());
        }
    }

}

3、导入excel
监听器

public class DataListener extends AnalysisEventListener {
    public boolean really;
    public boolean repeatFlag;
    protected ExcelService service;
    List<Object> list = new ArrayList();
    @Override
    public void invoke(Object o, AnalysisContext analysisContext) {
        list.add(o);
    }

    private void saveData() {
        try {
            this.repeatFlag = service.saveData(list,really);
        }catch (Exception e){
            throw new ValidateException("导入数据失败，请检查数据");
        }

    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        saveData();
    }
    public DataListener(ExcelService excelService,boolean really){
        this.service =  excelService;
        this.really = really;
    }
}

public interface ExcelService {
    boolean saveData(List list,boolean really);
}

DataListener listener = new DataListener(checkPointService,excelInfo.getReally());
        EasyExcelFactory.read(excelInfo.getFile().getInputStream(), CheckPointExcelVO.class,listener).sheet().doRead();

saveData自定义业务代码，将excel数据保存到数据库或做其他处理