<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
</bean>
html
<form action="/upload" method="POST" enctype="multipart/form-data">
<input type="file" name="file" />
<input type="submit" value="Upload" />
</form>
@Controller
public class FileUploadController {
@RequestMapping(value = "/upload", method = RequestMethod.POST)
public String handleFileUpload(@RequestParam("file") MultipartFile file) {
if (!file.isEmpty()) {
try {
byte[] bytes = file.getBytes();
// ...
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
@Controller
public class FileDownloadController {
@RequestMapping(value = "/download", method = RequestMethod.GET)
public void handleFileDownload(HttpServletRequest request, HttpServletResponse response) throws IOException {
File file = new File(filePath);
if (file.exists()) {
response.setContentType("application/octet-stream");
response.setContentLength((int) file.length());
response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
try (InputStream inputStream = new FileInputStream(file);
OutputStream outputStream = response.getOutputStream()) {
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
}
} else {
}
}
}
