springboot下载文件(使用流)

1.FileServiceImpl.java

/**
	 * 下载文件
	 * 
	 * @param address
	 * @param response
	 * @throws IOException
	 */
	@Override
	public void downloadFile(String address, HttpServletResponse response) throws IOException {
		if (address.contains("%")) {
			try {
				address = URLDecoder.decode(address, "UTF-8");
			} catch (UnsupportedEncodingException e) {
				throw new CyException("文件路径有误");
			}
		}
		ServletOutputStream out = null;
		FileInputStream in = null;
		try {
			in = new FileInputStream(new File(address));
			String[] dir = address.split("/");
			String fileName = dir[dir.length - 1];
			// 设置响应类型为html，编码为utf-8，处理相应页面文本显示的乱码
			response.setContentType("application/octet-stream");
			// 设置文件头：最后一个参数是设置下载文件名
			response.setHeader("Content-disposition", "attachment;filename=" + fileName);
			out = response.getOutputStream();
			// 读取文件流
			int len = 0;
			byte[] buffer = new byte[1024 * 10];
			while ((len = in.read(buffer)) != -1) {
				out.write(buffer, 0, len);
			}
			out.flush();
		} catch (FileNotFoundException e) {
			throw new CyException("文件路径有误");
		} finally {
			response.flushBuffer();
			try {
				out.close();
				in.close();
			} catch (NullPointerException e) {
				throw new CyException("responseFileStream stream close() error:NullPointerException" + e.toString());
			} catch (Exception e) {
				throw new CyException("responseFileStream stream close() error:" + e.toString());
			}
		}

	}

2.FileController.java

@RequestMapping(value = "/downloadFile", method = RequestMethod.GET)
	@ResponseBody
	@Validated
	public void downloadFile(@NotBlank @RequestParam(value = "address") String address, HttpServletResponse response)
			throws IOException {
		fileService.downloadFile(address, response);
	}

 

 转自：https://www.cnblogs.com/xian-yu/p/13267312.html