如何修复java下载按钮连续单击客户端中止异常:java.io.IOException错误?

Question

我的下载页面有两个下载(pdf和安装程序(按钮。当下载按钮仅单击一次时，它工作正常。但是当连续单击时，它会抛出ClientAbortException:java.io.IOException错误。我已经为ClientAbortException找到了许多答案，但它们对我来说并不容易理解。有人可以帮助我如何解决此错误吗？

这是我在控制器中下载按钮的代码：

@Repository    
public interface UserRepository extends JpaRepository<User, Long> {
User findByToken(String token);
}
@Controller
public class UserController {
@RequestMapping(value = "download", method = RequestMethod.POST, params = "action=ins")
public String downloadInstaller(HttpServletRequest request, HttpServletResponse response, @ModelAttribute User user, Model model)
{
User user2 = userRepository.findByToken(user.getToken());
if(user2.getDownload() == 0) {
user2.setDownload(1);
userRepository.save(user2);
File file = new File("File");
download(file, response);
log.info(Log.LOG_DOWNLOAD_INSTALLER);
return "";
}
return "downloaded";
}
@RequestMapping(value = "download", method = RequestMethod.POST, params = "action=pdf")
public String downloadPDF(HttpServletResponse response, @ModelAttribute User user, Model model) {       
User user2 = userRepository.findByToken(user.getToken());
if(user2.getDownload() == 0) {
user2.setDownload(1);
userRepository.save(user2);
File file = new File("Pdf");
download(file, response);
log.info(Log.LOG_DOWNLOAD_PDF);
return "";
}
return "downloaded";
}
public void download(File file, HttpServletResponse response) {
try {
InputStream is = new FileInputStream(file);
response.setContentType("application/octet-stream");
// Response header
response.setHeader("Content-Disposition", "attachment; filename="" + file.getName() + """);
// Read from the file and write into the response
OutputStream os = response.getOutputStream();
byte[] buffer = new byte[1024];
int len;
while ((len = is.read(buffer)) != -1) {
os.write(buffer, 0, len);
}
os.flush();
os.close();
is.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {           
e.printStackTrace();
}   
}
}

Answer 1

您是否从 download(( 方法的 "os.flush((;" 行中得到异常？如果是这样，这基本上意味着发送请求的客户端不再等待响应。如果您发出了两个请求，则可能是第一个请求失败。

如果您通过多次单击按钮没有什么特别想要实现的目标，我想您可以捕获并忽略 download(( 中的异常？