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导出

一、excel格式导出至response

1、List<对象>导出

Map<String, String> headerAlias = new LinkedHashMap<String, String>();
headerAlias.put("数据列一对象英文名称", "显示的中文名称");
... // BigExcelWriter excelWriter = new BigExcelWriter();
excelWriter.setHeaderAlias(headerAlias);
excelWriter.write(list); //  List<对象> list 是数据
if (null != response) {// 下边两行任取一行都可以response.addHeader("Content-Type", "application/vnd.ms-excel;charset=UTF-8");// response.addHeader("Content-Type", "application/octet-stream");response.addHeader("Content-Disposition", excelWriter.getDisposition("excel表名", StandardCharsets.UTF_8));
}
excelWriter.flush(response.getOutputStream(), true);
excelWriter.close();

2、json对象不固定列导出

// swagger无法测试
HttpServletResponse response = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getResponse(); // 获取response对象List<List<String>> resultListList = new ArrayList<>(); // 用于模拟excel
List<String> resultHeadList = new ArrayList<>(); // excel表头
resultHeadList.add("NAME");
... // 这里是固定的确定的列for (int j = 0; j < jsonObj.size(); j++) {JSONArray jsonArray = jsonObj.getJSONArray("num" + j);List<String> resultList = new ArrayList<>(); // 模拟excel一行if (j == 0) { // 第一行resultList.add("固定列的相同取值");... // 固定列处理} else { // 其余行resultList.add("");... // 固定列处理}for (int i = 0; i < jsonArray.size(); i++) {JSONObject obj = jsonArray.getJSONObject(i);String name = StrUtil.trimToEmpty(obj.getStr("name"));String value = StrUtil.trimToEmpty(obj.getStr("value"));if (j == 0) {resultHeadList.add(name); // 表头增加相应名称}resultList.add(value);}resultListList.add(resultList);
}
resultListList.add(0, resultHeadList);
BigExcelWriter excelWriter = new BigExcelWriter();
excelWriter.write(resultListList);
if (null != response) {// 下边两行任取一行都可以response.addHeader("Content-Type", "application/vnd.ms-excel;charset=UTF-8");// response.addHeader("Content-Type", "application/octet-stream");response.addHeader("Content-Disposition", excelWriter.getDisposition("excel表名", StandardCharsets.UTF_8));
}
excelWriter.flush(response.getOutputStream(), true);
excelWriter.close();

二、压缩包格式导出至response

// 多个数据逗号分隔 String ->String[] 正则表达式：[,;，；：\\s]+
String[] fileUrlArray = Arrays.stream(StrUtil.trimToEmpty(request.getParameter("fileUrl")).replaceAll([,;，；：\\s]+, ",").replaceAll("^,|,$", "").split(",")).filter(StrUtil::isNotBlank).distinct().toArray(String[]::new);
// String[] 转换成 List 也仅仅用于 fileUrlSuffixMap 中快捷获得某一元素的下标 fileUrlList.indexOf(m)
List<String> fileUrlList = new ArrayList<>(fileUrlArray.length);
Collections.addAll(fileUrlList, fileUrlArray);List<String> suffixList = Arrays.stream(fileUrlArray).map(m -> m.substring(m.lastIndexOf("."))).collect(Collectors.toList()); // 图片后缀名
Map<String, String> fileUrlSuffixMap = Arrays.stream(fileUrlArray).collect(Collectors.toMap(m -> m, m -> suffixList.get(fileUrlList.indexOf(m)))); // 图片url和后缀名mapString sku = StrUtil.trimToEmpty(request.getParameter("sku")); // 仅仅用于压缩包命名
String rootPath = request.getRealPath("/");
File file = new File(rootPath + "temp_download");
if (!file.exists()) {file.mkdir();
}
Arrays.stream(fileUrlArray).forEach(m -> HttpUtil.downloadFile(m,FileUtil.file(new File(rootPath + "temp_download" + File.separator + m.substring(m.lastIndexOf("/") + 1, m.lastIndexOf(".")) + fileUrlSuffixMap.get(m)))));try {File zipFile = null;zipFile = new File(rootPath + "temp_download" + "/" + sku + ".zip");FileOutputStream zipFos = new FileOutputStream(zipFile);ArchiveOutputStream archOut = new ArchiveStreamFactory().createArchiveOutputStream(ArchiveStreamFactory.ZIP, zipFos);ZipArchiveOutputStream zos = (ZipArchiveOutputStream) archOut;for (int i = 0; i < fileUrlArray.length; i++) {String ele = fileUrlArray[i];File imageFile = new File(rootPath + "temp_download" + "/" + ele.substring(ele.lastIndexOf("/") + 1, ele.lastIndexOf(".")) + suffixList.get(i));ZipArchiveEntry zipEntry = new ZipArchiveEntry(imageFile, imageFile.getName());zos.putArchiveEntry(zipEntry);zos.write(FileUtils.readFileToByteArray(imageFile));if (imageFile.exists()) {imageFile.delete();}}zos.closeArchiveEntry();zos.flush();zos.close();OutputStream out = null;out = response.getOutputStream();response.reset();response.setHeader("Content-Disposition", "attachment;filename=" + new String((sku + ".zip").getBytes("GB2312"), "ISO-8859-1"));response.setContentType("application/octet-stream; charset=utf-8");response.setCharacterEncoding("UTF-8");out.write(FileUtils.readFileToByteArray(zipFile));out.flush();out.close();if (zipFile.exists()) {zipFile.delete();}if (file.exists()) {file.delete();}
} catch (Exception e) {e.printStackTrace();
}

使用Hutool工具简化代码

// 输出到内存里面
String[] fileArray = fileStr.split(",");
try {AtomicInteger atomicAdd = new AtomicInteger(); // 文件大小累加器List<String> fileName = CollUtil.list(false); // 文件名InputStream[] ins = Arrays.stream(fileArray).map(url -> {byte[] bytes = HttpUtil.downloadBytes(url); // 上传到内存中fileName.add(url.substring(url.lastIndexOf("/") + 1)); // 文件名atomicAdd.addAndGet(bytes.length);return new ByteArrayInputStream(bytes);}).toArray(InputStream[]::new);ByteArrayOutputStream byteStream = new ByteArrayOutputStream(atomicAdd.intValue());ZipUtil.zip(byteStream, fileName.toArray(new String[0]), ins); // 参数：目标流、流数据在压缩文件中的路径或文件名、要压缩的response.setHeader("Content-Disposition", "attachment;filename=" + sku + ".zip");response.setContentType("application/octet-stream; charset=utf-8");OutputStream out = response.getOutputStream();out.write(byteStream.toByteArray());out.flush();out.close();
} catch (Exception e) {e.printStackTrace();
}

导入

一、对象导入

excelList = excelReader.readAll(....class);

二、不固定列导入

if (file.isEmpty()) {return failure("文件为空");
}
InputStream inputStream = null;
Boolean result = false; // 修改成功标志
List<Map<String,Object>> excelList = new ArrayList<>();
Obj obj = new Obj(); // excel对应的对象，其中一个字段存json数据
try {inputStream = file.getInputStream();ExcelReader excelReader = ExcelUtil.getReader(inputStream);// 检验固定列是否正确if (!"NAME".equals(excelReader.readRow(0).get(0))) {return ...} // else if ... 其余固定列的检验// 读取为Map列表，默认第一行为标题行，Map中的key为标题，value为标题对应的单元格值。excelList = excelReader.readAll();// 两种方式// excelReader.readRow(0).get(0)、excelList.get(0).get("NAME")obj.setName(excelList.get(0).get("NAME").toString());JSONObject jsonObj = new JSONObject();for (int i = 0; i < excelList.size(); i++) {JSONArray jsonArray = new JSONArray();Map<String, Object> oneObjMap = excelList.get(i);for (Map.Entry<String, Object> entry : oneObjMap.entrySet()) {JSONObject jsonObject = new JSONObject();String key = entry.getKey();Object value = entry.getValue();if ("NAME".equals(key) || ...) { // 遇到固定列则跳过continue;}jsonObject.set("name", key);jsonObject.set("value", value);jsonArray.add(jsonObject);}jsonObj.set("num" + i, jsonArray);}obj.setJsonObj(jsonObj.toString());
} catch (Exception e) {e.printStackTrace();
}