前端请求

vue3+axios+typescript

downloadByUrlStream({url:process.env.VUE_APP_API_URL1+"/MeshDevice/upExcel"})

 export function downloadByUrlStream({url, target = '_self', fileName, fileType}: {url: string;target?: '_self' | '_blank';fileName?: string;fileType?: string;
}): Promise<boolean> {return new Promise<boolean>((resolve, reject) => {const link = document.createElement('a');link.href = url;link.target = target;if (link.download !== undefined) {link.download = fileName || getFileName(url)}if (document.createEvent) {const e = document.createEvent('MouseEvents');e.initEvent('click', true, true);link.dispatchEvent(e);return resolve(true);}if (url.indexOf('?') === -1) {url += '?download';}window.open(url, target);return resolve(true);})
}

Springboot 后端部分
先在pom文件中引用依赖

        <!-- 引入easyexcel--><dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.1.1</version></dependency><!--使用POI读取文件--><dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>4.1.2</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>4.1.2</version></dependency>

注意：如果你引入的easyexcel 是3.x版本请也将poi对应升至4.x版本

导出数据

controller or service 层

    @GetMapping("/upExcel")public void downloadDeviceExcel(HttpServletResponse response,HttpServletRequest request) throws ParseException {try {List<MeshDeviceVos> list = meshDeviceMapper.deviceByAll();Set<String> includeColumnFieldNames = new HashSet<String>();includeColumnFieldNames.add("mac");includeColumnFieldNames.add("ver");includeColumnFieldNames.add("innermodel");includeColumnFieldNames.add("serialNumber");response.setContentType("application/vnd.ms-excel");response.setCharacterEncoding("utf-8");// 这里URLEncoder.encode可以防止中文乱码 当然和easyExcel没有关系String fileName = URLEncoder.encode("设备信息表", "UTF-8").replaceAll("\\+", "%20");response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");// 如果不用模板的方式导出的话，是doWriteEasyExcel.write(response.getOutputStream(), MeshDeviceData.class).includeColumnFieldNames(includeColumnFieldNames).sheet("设备信息表数据").doWrite(list);}catch (Exception e){e.printStackTrace();}}

// 根据用户传入字段假设我们要忽略字段
Set<String> excludeColumnFiledNames = new HashSet<String>();

// 根据用户传入字段假设我们只要导出字段
Set<String> includeColumnFiledNames = new HashSet<String>();

实体类

@Data
public class MeshDeviceData {@ExcelProperty(index = 0,value = "Mac")@ColumnWidth(20)private String mac;@ExcelProperty(index = 1,value = "版本")private String ver;@ExcelProperty(index = 2,value = "型号")private String innermodel;@ExcelProperty(index = 3,value = "序列号")@ColumnWidth(20)private String serialNumber;
}

导入数据

前端代码

    <p><a-uploadv-model:file-list="fileList"name="file"accept=".xlsx,.xls":multiple="true":action="importUrl":headers="headers"@change="handleChange"><a-button><upload-outlined></upload-outlined>点击上传</a-button></a-upload></p>

handleChange 方法

    const fileList = ref<FileItem[]>([])const importUrl =ref<string>(process.env.VUE_APP_API_URL1 + "/shop/importExcel"); const handleChange = (info: FileInfo) => {if (info.file.status !== 'uploading') {console.log(info.file, info.fileList)}fileList.value = [...info.fileList].splice(-1)if (info.file.status === 'done') {debuggerif (info.file.response.code === 0) {message.success('导入成功')ctx.emit('handle', false)} else {message.error('导入失败 ' + info.file.response.message)}} else if (info.file.status === 'error') {message.error(`${info.file.name} 上传失败`)}}

后端controller or service

    @PostMapping("/importExcel")public RS insertCategoriesExcel(@RequestParam("file") MultipartFile file){if(StringUtils.isEmpty(file)){throw  new MyException(1,"文件不能为空");}careCategoriesService.importCategories(file,careCategoriesService);return new RS().ok();}

    @Overridepublic void importCategories(MultipartFile file, CareCategoriesService careCategoriesService) {try {InputStream inputStream = file.getInputStream();EasyExcel.read(inputStream, CategoriesVo.class,new CategoriesExcleListener(careCategoriesService)).sheet().doRead();}catch (Exception e){e.printStackTrace();//throw  new MyException(1,"上传出错了");}}

新增一个listener 类继承AnalysisEventListener<CategoriesVo> CategoriesVo 是实体类

public class CategoriesExcleListener extends AnalysisEventListener<CategoriesVo> {public CareCategoriesService careCategoriesService;public CategoriesExcleListener(CareCategoriesService careCategoriesService) {this.careCategoriesService = careCategoriesService;}@Overridepublic void invoke(CategoriesVo careCategoriesVo, AnalysisContext analysisContext) {if(careCategoriesVo ==null){throw  new MyException(1,"添加失败");}CareCategories careCategories = new CareCategories();BeanUtils.copyProperties(careCategoriesVo,careCategories);//插入数据库String title = careCategories.getTitle();QueryWrapper<CareCategories> careCategoriesQueryWrapper = new QueryWrapper<>();careCategoriesQueryWrapper.eq("title",title);List<CareCategories> categoriesList = careCategoriesService.list(careCategoriesQueryWrapper);if(categoriesList.size()!=0){throw  new MyException(1,"该类别已经存在库中，请勿重复导入");}careCategoriesService.save(careCategories);}@Overridepublic void doAfterAllAnalysed(AnalysisContext analysisContext) {}
}

遇到下载无法打开，后端报

java.lang.NoSuchMethodError: org.apache.poi.ss.usermodel.Cell.getCellType()

需要将poi版本如

<dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.17</version>
</dependency>

更改为

<dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>4.1.2</version>
</dependency>

更多easyExcel 用法可以前往官方API查看EasyExcel官方文档 - 基于Java的Excel处理工具 | Easy Excel

gitHub地址：GitHub - alibaba/easyexcel: 快速、简洁、解决大文件内存溢出的java处理Excel工具

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导出数据

导入数据

前端代码

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