java spring 下载文件_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);

}