后台输出流到前端
//有错误信息,就导出文件 if (errorList != null && errorList.size() > 0) { String title = "导入国产药数据的异常数据"; ExcelUtils.exportExcel(errorList, title, title, StandardCode.class, title, response); return null; }
在响应拦截器中加以下代码:
if (headers['content-type'].toLowerCase() === 'application/vnd.ms-excel;charset=utf-8') { return response }
如果不加这段代码会报错:
No converter for [class com.ljxx.entity.Result] with preset Content-Type 'application/vnd.ms-excel;charset=UTF-8'
由于上述代码返回的是response,故使用filedownload下载的时候应该为response.data
handleUploadChange1(file) { if (file.name.lastIndexOf('.') < 0) { this.$message.error('上传文件只能是xls、xlsx格式!') return } const testMsg = file.name.substring(file.name.lastIndexOf('.') + 1).toLowerCase() const extensionXLS = testMsg == 'xls' const extensionXLSX = testMsg == 'xlsx' if (!extensionXLS && !extensionXLSX) { this.$message.error('上传文件只能是xls、xlsx格式!') return } const isLt2M = file.size / 1024 / 1024 < 2 if (!isLt2M) { this.$message.error('上传文件不能超过 2MB!') return } console.log('import continue') this.importLoading = true this.importDisabled = true const data = new FormData() data.append('file', file.raw) standardCode.importDomesticExcel(data).then(response => { console.log(response) if (response.success) { this.open2(response.msg) this.importLoading = false this.importDisabled = false this.getList() } else { this.$message.success("部分数据导入失败,数据已下载到本地,请查看!") fileDownload(response.data, '导入数据中的异常数据.xlsx') // this.open2(response.msg) this.importLoading = false this.importDisabled = false } }).catch(() => { this.open2('抱歉,导入失败') this.importLoading = false this.importDisabled = false }) },
如果报错文件打不开,如下:
是因为responseType值应为arraybuffer,而不能是arraybuffer;charset=utf-8
importDomesticExcel(data) { return request({ url: '/standardCode/import', method: 'post', data: data, responseType: 'arraybuffer', headers: { 'Content-Type': 'multipart/form-data' } }) },
其中:multipart/form-data:指定传输数据为二进制类型,比如图片、mp3、文件。