EasyPoi介绍:
利用注解的方式简化了Excel、Word、PDF等格式的导入导出，而且是百万级数据的导入导出。EasyPoi官方网址：EasyPoi教程_V1.0 (mydoc.io)。下面我写了一个测试用例，真的是很方便，可以利用注解自动完成单元格的合并，设置单元格宽度、设置字符替换、并且可以很好的完成实体类之间一对一、一对多关系的处理
不卖关子，事先说明百万级大数据操作使用：导入（importExcelBySax），导出（exportBigExcel）
导入依赖
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-base</artifactId>
<version>4.1.0</version>
</dependency>
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-web</artifactId>
<version>4.1.0</version>
</dependency>
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-annotation</artifactId>
<version>4.1.0</version>
</dependency>
实体对象
/**
* 免打扰手机号
*
* @author Mark sunlightcs@gmail.com
* @since 1.0.0
*/
@Data
public class NonIntrusiveExcel {
@Excel(name = "手机号码", width = 20)
@NotNull
private String phone; @Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
NonIntrusiveExcel that = (NonIntrusiveExcel) o;
return phone.equals(that.phone);
} @Override
public int hashCode() {
return Objects.hash(phone);
}
}
导入导出工具类
/**
* excel工具类
*
* excel中xls和xlsx的区别是：
* 1、文件格式不同。xls是一个特有的二进制格式，其核心结构是复合文档类型的结构，而xlsx的核心结构是XML类型的结构，采用的是基于 XML 的压缩方式，使其占用的空间更小。xlsx 中最后一个 x 的意义就在于此。
* 2、版本不同。xls是excel2003及以前版本生成的文件格式，而xlsx是excel2007及以后版本生成的文件格式。
* 3、兼容性不同。xlsx格式是向下兼容的，可兼容xls格式。
*
* @author Mark sunlightcs@gmail.com
*/
public class ExcelUtils { /**
* Excel导出
*
* @param request request
* @param pojoClass 对象Class
*/
public static List importExcel(HttpServletRequest request, Class<?> pojoClass) throws IOException {
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
MultipartFile file = multipartRequest.getFile("file");
if (file == null) {
throw new RenException("未找到上传的文件！");
}
ImportParams params = new ImportParams();
params.setHeadRows(1);
params.setNeedVerify(true); // 开启校验规则
List targetList = null; try {
System.out.println("正在读取文件: " + file.getOriginalFilename() + "，开始导入数据。");
targetList = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
} catch (Exception e) {
e.printStackTrace();
} finally {
file.getInputStream().close();
} return targetList;
} /**
* Excel导出
*
* @param request request
* @param pojoClass 对象Class
*/
public static Set importBigExcel(HttpServletRequest request, Class<?> pojoClass) throws IOException {
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
MultipartFile file = multipartRequest.getFile("file");
if (file == null) {
throw new RenException("未找到上传的文件！");
}
ImportParams params = new ImportParams();
params.setHeadRows(1);
params.setNeedVerify(true); // 开启校验规则
Set targetList = new HashSet(); // 添加set集合过滤去重元素 try {
System.out.println("正在读取文件: " + file.getOriginalFilename() + "，开始导入数据。");
ExcelImportUtil.importExcelBySax(file.getInputStream(), pojoClass, params, new IReadHandler() {
@Override
public void handler(Object o) {
targetList.add(o);
} @Override
public void doAfterAll() { }
});
} catch (Exception e) {
e.printStackTrace();
} finally {
file.getInputStream().close();
} return targetList;
} /**
* Excel导出
*
* @param response response
* @param fileName 文件名
* @param list 数据List
* @param pojoClass 对象Class
*/
public static void exportExcel(HttpServletResponse response, String fileName, Collection<?> list,
Class<?> pojoClass) throws IOException {
if (StringUtils.isBlank(fileName)) {
//当前日期
fileName = DateUtil.formatDatetime(new Date());
} // 设置导出格式为xlsx，默认xlsx
ExportParams exportParams = new ExportParams();
exportParams.setType(ExcelType.XSSF); Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
response.setCharacterEncoding("UTF-8");
response.setHeader("content-Type", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,application/vnd.ms-excel");
// response.setHeader("content-Type", "application/vnd.ms-excel");
response.setHeader("Content-Disposition",
"attachment;filename=" + URLEncoder.encode(fileName, "UTF-8") + ".xlsx");
ServletOutputStream out = response.getOutputStream();
workbook.write(out);
out.flush();
} /**
* Excel导出
*
* @param list 数据List
* @param pojoClass 对象Class
*/
public static byte[] exportBigExcelByte(Collection<?> list, Class<?> pojoClass) throws IOException {
Workbook workbook; // 设置导出单sheet页最大一百万行数据
ExportParams exportParams = new ExportParams();
exportParams.setMaxNum(1000000);
exportParams.setType(ExcelType.XSSF); workbook = ExcelExportUtil.exportBigExcel(exportParams, pojoClass, (queryParams, num) -> {
// 只导出一次，第二次返回null终止循环
if (((int) queryParams) == num) {
return null;
}
System.out.println("正在进行大数据量导出，条数: " + list.size());
return Arrays.asList(list.toArray());
}, 2); ByteArrayOutputStream bos = new ByteArrayOutputStream(); workbook.write(bos);
bos.close(); byte[] bytes = bos.toByteArray(); return bytes;
} /**
* Excel导出，先sourceList转换成List<targetClass>，再导出
*
* @param response response
* @param fileName 文件名
* @param sourceList 原数据List
* @param targetClass 目标对象Class
*/
public static void exportExcelToTarget(HttpServletResponse response, String fileName, Collection<?> sourceList,
Class<?> targetClass) throws Exception {
List targetList = new ArrayList<>(sourceList.size());
for (Object source : sourceList) {
Object target = targetClass.newInstance();
BeanUtils.copyProperties(source, target);
targetList.add(target);
} exportExcel(response, fileName, targetList, targetClass);
} /**
* Excel生成
*
* @param response response
* @param fileName 文件名
*/
public static void mkdirExcel(HttpServletResponse response, String fileName,
Workbook workbook) throws IOException {
if (StringUtils.isBlank(fileName)) {
//当前日期
fileName = DateUtil.formatDatetime(new Date());
} response.setCharacterEncoding("UTF-8");
response.setHeader("content-Type", "application/vnd.ms-excel");
response.setHeader("Content-Disposition",
"attachment;filename=" + URLEncoder.encode(fileName, "UTF-8") + ".xls");
ServletOutputStream out = response.getOutputStream();
workbook.write(out);
out.flush();
} /**
* XSSF
* excel添加下拉数据校验
*
* @param workbook 哪个 sheet 页添加校验
* @param dataSource 数据源数组
* @param col 第几列校验（0开始）
* @return
*/
public static void createXssfSelected(Workbook workbook, String[] dataSource, int col) {
Sheet sheet = workbook.getSheetAt(0);
CellRangeAddressList cellRangeAddressList = new CellRangeAddressList(1, 65535, col, col);
DataValidationHelper helper = sheet.getDataValidationHelper();
DataValidationConstraint constraint = helper.createExplicitListConstraint(dataSource);
DataValidation dataValidation = helper.createValidation(constraint, cellRangeAddressList);
//处理Excel兼容性问题
if (dataValidation instanceof XSSFDataValidation) {
dataValidation.setSuppressDropDownArrow(true);
dataValidation.setShowErrorBox(true);
} else {
dataValidation.setSuppressDropDownArrow(false);
}
dataValidation.setEmptyCellAllowed(true);
dataValidation.setShowPromptBox(true);
dataValidation.createPromptBox("提示", "只能选择下拉框里面的数据");
sheet.addValidationData(dataValidation);
} }
接口调用
@RestController
@RequestMapping("/app/nonIntrusive")
@Slf4j
public class NonIntrusiveController {
@Autowired
private NonIntrusiveService appNonIntrusiveService; @PostMapping(value = "/importAndExportFilter")
@LogOperation("免打扰过滤")
@RequiresPermissions("app:nonIntrusive:filter")
public byte[] importFilter(HttpServletRequest request) throws Exception {
long startTime = System.currentTimeMillis(); Set<NonIntrusiveExcel> importSet = ExcelUtils.importBigExcel(request, NonIntrusiveExcel.class); log.info("已读取文件内容条数：{}, 总共耗时：{} 毫秒", importSet.size(), System.currentTimeMillis() - startTime); startTime = System.currentTimeMillis(); Set<NonIntrusiveExcel> phoneSet = appNonIntrusiveService.listExcel(); log.info("已加载存储的免打扰号码库总条数：{}, 总共耗时：{} 毫秒", phoneSet.size(), System.currentTimeMillis() - startTime); startTime = System.currentTimeMillis(); // Set排除已存在的集合数据
importSet.removeAll(phoneSet); log.info("已完成过滤免打扰号码后的总条数：{}, 总共耗时：{} 毫秒", importSet.size(), System.currentTimeMillis() - startTime); return ExcelUtils.exportBigExcelByte(importSet, NonIntrusiveExcel.class);
} @GetMapping(value = "/exportTemplate")
public void export(HttpServletResponse response) throws Exception {
ExcelUtils.exportExcelToTarget(response, null, new ArrayList<>(), NonIntrusiveExcel.class);
} }
