// href为文件的存储路径或者地址，download为问文件名
<a href="/images/logo.jpg" rel="external nofollow" download="logo" />

window.location = 'http://127.0.0.1:8080/api/download"color: #800000">优点：简单方便。

缺点：只能进行get请求，当有token校验的时候不方便。

方法三：通过请求后台接口


// download.js
import axios from 'axios'

export function download(type, name) {
 axios({
 method: 'post',
 url: 'http://127.0.0.1:8080/api/download',
 // headers里面设置token
 headers: {
 loginCode: 'xxx',
 authorization: 'xxx'
 },
 data: {
 name: name,
 type: type
 },
 // 二进制流文件，一定要设置成blob，默认是json
 responseType: 'blob'
 }).then(res => {
 const link = document.createElement('a')
 const blob = new Blob([res.data], { type: 'application/vnd.ms-excel' })
 link.style.display = 'none'
 link.href = URL.createObjectURL(blob)
 link.setAttribute('download', `${name}.xlsx`)
 document.body.appendChild(link)
 link.click()
 document.body.removeChild(link)
 })
}




// download.java
@RequestMapping(value = "/api/download",produces = "application/octet-stream", method = RequestMethod.POST)
public void downloadTemplate(@RequestBody Map<String,Object> paramsMap, HttpServletResponse response) {
 try {
 if (paramsMap.get("type").equals("xxx") && paramsMap.get("name").equals("xxx")) {
 String[] str = new String[]{"区县","所属省份","所属地市"};
 Workbook workbook = ExportExcel.exportExcel("行政区划表模版", str, null, "yyyy-MM-dd");
 download(response, workbook, "CityDict");
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
}

private void download(HttpServletResponse response, Workbook workbook, String fileName) {
 try {
 response.setContentType("application/octet-stream;charset=UTF-8;");
 response.addHeader("Content-Disposition", "attachment;fileName=" + fileName + ".xlsx");
 ByteArrayOutputStream by = new ByteArrayOutputStream();
 OutputStream osOut = response.getOutputStream();
 // 将指定的字节写入此输出流
 workbook.write(osOut);
 // 刷新此输出流并强制将所有缓冲的输出字节被写出
 osOut.flush();
 // 关闭流
 osOut.close();
 } catch (IOException e) {
 LogUtils.getExceptionLogger().info("下载模板错误:{}", e.getMessage());
 }
}


优点：可以在headers里面设置token，文件是java代码中生成的，生成的文件比较灵活。

缺点：实现起来比较复杂。
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