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一个通用的EXCEL生成下载方法
Excel是一个Java开发中必须会用到的东西，之前博主也发过一篇关于使用Excel的文章，但是最近工作中，发现了一个更好的使用方法，所以，就对之前的博客进行总结，然后就有了这篇新的，万能通用的方法说明书了
好了，闲话不多说，直接上干货了
控制器代码如下@Operation(summary = "Excel导入", description = "Excel导入") @GetMapping("/commPointManagement/importExcel") public ResultBody importExcel(@RequestParam MultipartFile excel, @RequestParam(value = "creatorId") Long creatorId, HttpServletResponse response){ try { return commPointManagementService.importExcel(excel,creatorId,response); } catch (Exception e) { return ResultBody.failed("导入失败"+e.getMessage()); } } /** * excel导出 * @param dto */ @Operation(summary = "Excel导出", description = "Excel导出") @PostMapping("/commPointManagement/downloadInfoExcel") public void downloadInfoExcel(@RequestBody CommPointManagementDTO dto, HttpServletResponse response){ commPointManagementService.downloadInfoExcel(dto,response); } /** * 下载模板 */ @GetMapping("/commPointManagement/downloadExcelTemplate") @Operation(summary = "下载模板excel模板", description = "下载模板excel模板") public void exportExcelFormat(HttpServletResponse response) { commPointManagementService.exportExcelFormat(response); }- 1
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上面总结了三个方法，都是不使用模板的，代码也有注释，大家可根据注释获取自己需要的方法
service接口就不粘贴了，直接上实现类了
public void exportExcelFormat(HttpServletResponse response) { List<List<String>> customTitle = new ArrayList<>(); List<String> titles = Lists.newArrayList(); titles.add("字段1"); titles.add("字段2"); titles.add("字段3"); customTitle.add(titles); try { EasyPoiUtil.exportExcel("模板名称.xlsx", null, null, Lists.newArrayList(), CommPointManagementVO.class, customTitle, Lists.newArrayList(), response); } catch (Exception e) { throw new RuntimeException(e); } } @Override public ResultBody importExcel(MultipartFile excel,Long creatorId, HttpServletResponse response) throws Exception { //获取Excel中的数据集合 ExcelImportResult<CommPointManagementBean> importExcel = EasyPoiUtil.importExcel(excel, 1, 0, 0, false, CommPointManagementBean.class); List<CommPointManagementBean> importList = importExcel.getList(); int failCount = 0; int insertCount = 0; if (CollUtil.isEmpty(importList)) { return ResultBody.ok().msg("导入excel成功"); } Timestamp time = new Timestamp(new Date().getTime()); for (int i = 0; i < importList.size(); i++) { CommPointManagementBean date = importList.get(i); } return ResultBody.ok().data().msg("导入excel成功"); } @Override public void downloadInfoExcel(CommPointManagementDTO dto, HttpServletResponse response) { //获取数据库数据 IPage<CommPointManagementVO> page = commPointManagementMapper.findPage(new PageParams(dto.getPage(), dto.getLimit()), dto); List<CommPointManagementVO> records = page.getRecords(); List<List<String>> customTitle = new ArrayList<>(); List<String> titleList = new ArrayList<>(); titleList.add("字段1"); titleList.add("字段2"); titleList.add("字段3"); customTitle.add(titleList); try { EasyPoiUtil.exportExcel("表名.xlsx", "表头", "Excel中的页名", records, CommPointManagementVO.class, customTitle, new ArrayList<>(), response); } catch (Exception e) { throw new RuntimeException(e); } }- 1
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上面方法中的CommPointManagementVO.class是接口返回的实体类，虽然没有注解，但是细心一点看还是能看出来的，里面还有一个工具类EasyPoiUtil，这个就是咱们今天的主角了，主角介绍如下：
package com.secondcloud.system.server.util; import cn.afterturn.easypoi.excel.ExcelExportUtil; import cn.afterturn.easypoi.excel.ExcelImportUtil; import cn.afterturn.easypoi.excel.annotation.ExcelEntity; import cn.afterturn.easypoi.excel.annotation.ExcelTarget; import cn.afterturn.easypoi.excel.entity.ExportParams; import cn.afterturn.easypoi.excel.entity.ImportParams; import cn.afterturn.easypoi.excel.entity.enmus.ExcelType; import cn.afterturn.easypoi.excel.entity.params.ExcelExportEntity; import cn.afterturn.easypoi.excel.entity.result.ExcelImportResult; import cn.afterturn.easypoi.excel.export.ExcelExportService; import cn.afterturn.easypoi.util.PoiPublicUtil; import cn.hutool.core.collection.CollectionUtil; import cn.hutool.core.convert.Convert; import cn.hutool.core.util.StrUtil; import org.apache.poi.ss.usermodel.*; import org.apache.poi.ss.util.CellRangeAddress; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletResponse; import java.io.File; import java.io.OutputStream; import java.lang.reflect.Field; import java.net.URLEncoder; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; /** * easyPoi excel通用导入导出 */ public class EasyPoiUtil { private static final String SUFFIX = ".xlsx"; /** * exportExcel 通用导出方法(bean加注解) * * @param fileName 文件名 * @param title 标题 * @param sheetName 表单名 * @param list 数据 * @param pojoClass 数据类 * @param customTitle 自定义表头 * @param mergeList 自定义合并 * @param response 响应 * @throws Exception */ public static void exportExcel(String fileName, String title, String sheetName, List<?> list, Class<?> pojoClass, List<List<String>> customTitle, List<CellRangeAddress> mergeList, HttpServletResponse response) throws Exception { defaultExport(list, pojoClass, fileName, response, simpleParams(title, sheetName, fileName), customTitle, mergeList, null); } /** * exportExcelEntity 通用导出方法(自定义ExcelExportEntity) * * @param fileName 文件名 * @param title 标题 * @param sheetName 表单名 * @param list 数据 * @param entityList 数据配置 * @param customTitle 自定义表头 * @param mergeList 自定义合并 * @param response 响应 * @throws Exception */ public static void exportExcelEntity(String fileName, String title, String sheetName, List<?> list, List<ExcelExportEntity> entityList, List<List<String>> customTitle, List<CellRangeAddress> mergeList, HttpServletResponse response) throws Exception { defaultExport(list, null, fileName, response, simpleParams(title, sheetName, fileName), customTitle, mergeList, entityList); } /** * exportExcel 多表单导出方法(bean加注解) * * @param fileName 文件名 * @param configList title:标题 data:数据 entity:数据类 * @param response 响应 * @throws Exception */ public static void exportExcelMultiSheet(String fileName, List<Map<String, Object>> configList, HttpServletResponse response) throws Exception { // 根据fileName后缀确定excel文件是xls还是xlsx ExcelType type = ExcelType.HSSF; if (StrUtil.endWith(fileName, SUFFIX)) { type = ExcelType.XSSF; } Workbook workbook = ExcelExportUtil.exportExcel(configList, type); if (workbook != null) { try { if (CollectionUtil.isNotEmpty(configList)) { int sheetIndex = 0; for (Map<String, Object> map : configList) { List<List<String>> customTitle = (List<List<String>>) map.get("customTitle"); List<CellRangeAddress> mergeList = (List<CellRangeAddress>) map.get("mergeList"); String sheetTitle = Convert.toStr(map.get("sheetTitle")); Sheet sheet = workbook.getSheetAt(sheetIndex); if (sheet != null) { // 自定义合并 boolean mergeFlag = CollectionUtil.isNotEmpty(mergeList); if (mergeFlag) { for (CellRangeAddress merge : mergeList) { sheet.addMergedRegion(merge); } } // 合并多列标题(暂时支持第一行向左合并 第二行向上合并) int begin = 0; int end = 0; String tmpTitle = null; // 已合并区域标识 i&j List<String> mergedList = new ArrayList<>(); int i = 0; if (sheetTitle != null) { i++; } int line = i; CellStyle cellStyle = null; for (List<String> strings : customTitle) { Row row = sheet.getRow(i); if (row == null) { row = sheet.createRow(i); } int j = 0; for (String s : strings) { Cell cell = row.getCell(j); if (cell == null) { cell = row.createCell(j); cell.setCellStyle(cellStyle); } else if (cellStyle == null) { cellStyle = cell.getCellStyle(); } cell.setCellValue(s); if (!mergeFlag) { // 第一行合并规则 if (i == line) { if (StrUtil.isEmpty(s)) { end = j; } if (tmpTitle != null && StrUtil.isNotEmpty(s) && !tmpTitle.equals(s)) { if (end > begin) { sheet.addMergedRegion(new CellRangeAddress(i, i, begin, end)); for (int f = begin; f < end; f++) { mergedList.add(i + "&" + f); } } begin = j; tmpTitle = s; } if (tmpTitle == null) { begin = j; tmpTitle = s; } } else if (i == line + 1) { // 第二行向上合并 if (StrUtil.isEmpty(s) && !mergedList.contains((i - 1) + "&" + j)) { sheet.addMergedRegion(new CellRangeAddress(i - 1, i, j, j)); mergedList.add((i - 1) + "&" + j); mergedList.add(i + "&" + j); } } } j++; } if (!mergeFlag) { // 第一行合并规则(换行前) if (i == line) { if (strings.size() > 0 && end > begin) { sheet.addMergedRegion(new CellRangeAddress(i, i, begin, end)); for (int f = begin; f < end; f++) { mergedList.add(i + "&" + f); } } } } i++; } } sheetIndex++; } } } catch (Exception e) { } downLoadExcel(fileName, response, workbook); } } /** * importExcel 通用导入方法(bean加注解) * * @param file 导入文件 * @param titleRows 标题行数 * @param headerRows 头部行数 * @param keyIndex 主键列 如果这个cell没有值,就跳过，默认0 * @param needVerfiy 是否需要校验，默认false * @param pojoClass 数据类 * @return * @throws Exception */ public static <T> ExcelImportResult<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Integer keyIndex, Boolean needVerfiy, Class<T> pojoClass) throws Exception { if (file == null) { return null; } ImportParams params = new ImportParams(); params.setTitleRows(titleRows); params.setHeadRows(headerRows); params.setKeyIndex(keyIndex); params.setNeedVerify(needVerfiy); ExcelImportResult<T> rst = null; try { rst = ExcelImportUtil.importExcelMore(file.getInputStream(), pojoClass, params); } catch (Exception e) { e.printStackTrace(); throw e; } return rst; } /** * importExcel 指定表单导入方法(bean加注解) * * @param file 导入文件 * @param titleRows 标题行数 * @param headerRows 头部行数 * @param startSheetIndex 表单序号 * @param sheetNum 表单数量 * @param keyIndex 主键列 如果这个cell没有值,就跳过\ * @param needVerfiy 是否需要校验，默认false * @param pojoClass 数据类 * @return * @throws Exception */ public static <T> ExcelImportResult<T> importExcelCommon(MultipartFile file, Integer titleRows, Integer headerRows, Integer startSheetIndex, Integer sheetNum, Integer keyIndex, Boolean needVerfiy, Class<T> pojoClass) throws Exception { if (file == null) { return null; } ImportParams params = new ImportParams(); params.setTitleRows(titleRows); params.setHeadRows(headerRows); params.setStartSheetIndex(startSheetIndex); params.setSheetNum(sheetNum); params.setKeyIndex(keyIndex); params.setNeedVerify(needVerfiy); ExcelImportResult<T> rst = null; try { rst = ExcelImportUtil.importExcelMore(file.getInputStream(), pojoClass, params); } catch (Exception e) { e.printStackTrace(); throw e; } return rst; } /** * importExcel 根据文件路径导入excel(bean加注解) * * @param filePath * @param titleRows * @param headerRows * @param pojoClass * @param* @return * @throws Exception */ public static <T> ExcelImportResult<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws Exception { if (StrUtil.isEmpty(filePath)) { return null; } ImportParams params = new ImportParams(); params.setTitleRows(titleRows); params.setHeadRows(headerRows); ExcelImportResult<T> rst = null; try { rst = ExcelImportUtil.importExcelMore(new File(filePath), pojoClass, params); } catch (Exception e) { e.printStackTrace(); throw e; } return rst; } private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams, List<List<String>> customTitle, List<CellRangeAddress> mergeList, List<ExcelExportEntity> entityList) throws Exception { exportParams.setFixedTitle(false); Workbook workbook; int titleLine = 0; if (CollectionUtil.isNotEmpty(customTitle)) { titleLine = customTitle.size(); } // 自定义标题需要在标题下插入行 List<Object> t = new ArrayList<>(); while (titleLine > 1 && CollectionUtil.isNotEmpty(list)) { t.add(pojoClass.getDeclaredConstructor().newInstance()); titleLine--; } t.addAll(list); if (pojoClass == null) { workbook = ExcelExportUtil.exportExcel(exportParams, entityList, t); } else { workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, t); } if (workbook != null) { // 自定义标题 if (CollectionUtil.isNotEmpty(customTitle)) { Sheet sheet = workbook.getSheetAt(0); if (sheet != null) { // 自定义合并 boolean mergeFlag = CollectionUtil.isNotEmpty(mergeList); if (mergeFlag) { for (CellRangeAddress merge : mergeList) { sheet.addMergedRegion(merge); } } // 合并多列标题(暂时支持第一行向左合并 第二行向上合并) int begin = 0; int end = 0; String tmpTitle = null; // 已合并区域标识 i&j List<String> mergedList = new ArrayList<>(); int i = 0; if (exportParams.getTitle() != null) { i++; } if (exportParams.getSecondTitle() != null) { i++; } int line = i; CellStyle cellStyle = null; for (List<String> strings : customTitle) { Row row = sheet.getRow(i); if (row == null) { row = sheet.createRow(i); } int j = 0; for (String s : strings) { Cell cell = row.getCell(j); if (cell == null) { cell = row.createCell(j); cell.setCellStyle(cellStyle); } else if (cellStyle == null) { cellStyle = cell.getCellStyle(); } cell.setCellValue(s); if (!mergeFlag) { // 第一行合并规则 if (i == line) { if (StrUtil.isEmpty(s)) { end = j; } if (tmpTitle != null && StrUtil.isNotEmpty(s) && !tmpTitle.equals(s)) { if (end > begin) { sheet.addMergedRegion(new CellRangeAddress(i, i, begin, end)); for (int f = begin; f < end; f++) { mergedList.add(i + "&" + f); } } begin = j; tmpTitle = s; } if (tmpTitle == null) { begin = j; tmpTitle = s; } } else if (i == line + 1) { // 第二行向上合并 if (StrUtil.isEmpty(s) && !mergedList.contains((i - 1) + "&" + j)) { sheet.addMergedRegion(new CellRangeAddress(i - 1, i, j, j)); mergedList.add((i - 1) + "&" + j); mergedList.add(i + "&" + j); } } } j++; } if (!mergeFlag) { // 第一行合并规则(换行前) if (i == line) { if (strings.size() > 0 && end > begin) { sheet.addMergedRegion(new CellRangeAddress(i, i, begin, end)); for (int f = begin; f < end; f++) { mergedList.add(i + "&" + f); } } } } i++; } } } downLoadExcel(fileName, response, workbook); } } private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) throws Exception { OutputStream ouputStream = null; try { response.setCharacterEncoding("UTF-8"); response.setHeader("content-Type", "application/vnd.ms-excel"); response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8")); response.setHeader("Pragma", "No-cache"); ouputStream = response.getOutputStream(); workbook.write(ouputStream); } catch (Exception e) { e.printStackTrace(); throw e; } finally { if (ouputStream != null) { try { ouputStream.flush(); ouputStream.close(); } catch (Exception e) { } } } } /** * 获取表单配置项 * * @param title * @param sheetName * @param fileName * @return */ public static ExportParams simpleParams(String title, String sheetName, String fileName) { // 根据fileName后缀确定excel文件是xls还是xlsx ExcelType type = ExcelType.HSSF; if (StrUtil.endWith(fileName, SUFFIX)) { type = ExcelType.XSSF; } ExportParams exportParams = new ExportParams(title, sheetName, type); exportParams.setFixedTitle(false); return exportParams; } /** * 获取表单配置对象 * * @param title * @param sheetName * @param fileName * @param pojoClass * @param list * @param customTitle 自定义表头 * @param mergeList 自定义合并 * @return */ public static Map<String, Object> simpleParamsMap(String title, String sheetName, String fileName, List<?> list, Class<?> pojoClass, List<List<String>> customTitle, List<CellRangeAddress> mergeList) throws Exception { Map<String, Object> map = new HashMap<String, Object>(); map.put("title", simpleParams(title, sheetName, fileName)); map.put("entity", pojoClass); List<Object> array = new ArrayList<>(); if (CollectionUtil.isNotEmpty(customTitle)) { int size = customTitle.size(); while (size > 1) { array.add(pojoClass.getDeclaredConstructor().newInstance()); size--; } } if (list != null) { array.addAll(list); } map.put("data", array); map.put("customTitle", customTitle); map.put("mergeList", mergeList); map.put("sheetTitle", title); return map; } /** * 生成ExcelExportEntity * * @param name 名称 * @param value 属性 * @param merge 是否合并列 * @param list 下级entity * @return */ public static ExcelExportEntity getExportEntity(String name, String value, Boolean merge, Double width, Integer orderNum, String format, List<ExcelExportEntity> list) { ExcelExportEntity entity = new ExcelExportEntity(name, value); if (merge != null) { entity.setNeedMerge(merge); } if (width != null) { entity.setWidth(width); } if (orderNum != null) { entity.setOrderNum(orderNum); } if (format != null) { entity.setFormat(format); } if (CollectionUtil.isNotEmpty(list)) { entity.setList(list); } return entity; } public static List<ExcelExportEntity> classToEntityList(Class<?> pojoClass) { List<ExcelExportEntity> rst = new ArrayList<>(); try { Field[] fileds = PoiPublicUtil.getClassFields(pojoClass); ExcelTarget etarget = (ExcelTarget) pojoClass.getAnnotation(ExcelTarget.class); String targetId = etarget == null ? null : etarget.value(); new ExcelExportService().getAllExcelField(null, targetId, fileds, rst, pojoClass, (List) null, (ExcelEntity) null); } catch (Exception e) { } return rst; } }- 1
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这个工具类一般的格式都能使用的，具体复杂的Excel表格样式，还是使用Excel表格模板去做会更方便点，工具类的方发也有说明，大家自行查看哦。
本篇分享就到这里了，如果有使用问题，可以评论留言，有不对的地方，请批评指正，谢谢！ -
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- 原文地址：https://blog.csdn.net/qq_43757153/article/details/132673384
