java实现文件流下载

java Controller代码

 @ApiOperation(value = "文件下载")@ApiImplicitParams({@ApiImplicitParam(name = "filePath", value = "文件路径", required = true),@ApiImplicitParam(name = "fileName", value = "文件名", required = true)})@GetMapping("/down")public ReturnResult<Void> downFile(@RequestParam("filePath") String filePath, @RequestParam("fileName") String fileName, HttpServletResponse response) {ReturnResult<Void> result = new ReturnResult<>();String url = filePath + "/" + fileName;if (url.indexOf(KEY) == 0) {url = url.substring(1);}File file = new File(url);if (!file.exists()) {result.setStatus(ConstV.RETURN_404);result.setMessage("源文件已不存在");return result;}try (FileInputStream is = new FileInputStream(file);OutputStream os = response.getOutputStream()) {response.setContentType("application/octet-stream");response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);byte[] buffer = new byte[1024];int i;while ((i = is.read(buffer)) != -1) {os.write(buffer, 0, i);}os.flush();os.close();result.setStatus(ConstV.RETURN_OK);return result;} catch (Exception e) {log.error("下载文件发生错误，" + e.getMessage());result.setStatus(ConstV.RETURN_ERROR);result.setMessage("下载文件发生错误，" + e.getMessage());return result;}}

vue.js代码

 async down(row) {try {var response = await downFile(row.filePath, row.fileName)if (response.type === 'application/json') {this.$message({ message: '源文件已不存在或下载时发生错误' })return}console.log(response)this.downFile(response, row.fileName)} catch (error) {ErrMessage(error)}},/**
* 文件流下载
*/
downFile(content, fileName) {const blob = new Blob([content])const a = document.createElement('a')const url = window.URL.createObjectURL(blob)const filename = fileNamea.href = urla.download = filenamea.click()window.URL.revokeObjectURL(url)
}