[英]NoSuchFileException when trying to upload image in jave
當我嘗試使用 post 方法通過表單上傳文件時,發生NoSuchFileException
類型的錯誤,我不知道為什么。
這是代碼:
if (req.getPart("file") != null) {
Part file = req.getPart("file");
String fileName = file.getSubmittedFileName();
DiskFileItemFactory factory = new DiskFileItemFactory();
File repository = new File("./uploads");
factory.setRepository(repository);
try {
File thisFile = new File(repository, fileName);
try (InputStream input = file.getInputStream()) {
Files.copy(input, thisFile.toPath());
}
} catch (IOException e) {
e.printStackTrace();
}
UserDao.getInstance().addPicture("./uploads" + fileName, oldUser);
UserDao.getInstance().update(user, oldUser);
}
我確定出了什么問題,但我看不到……有人可以幫我嗎?
一開始我有這個代碼,但試圖解決錯誤我改變了它:
Part file = req.getPart("file");
String filename = file.getSubmittedFileName();
DiskFileItemFactory factory = new DiskFileItemFactory();
File repository = new File("./uploads");
factory.setRepository(repository);
ServletFileUpload upload = new ServletFileUpload(factory);
try {
List<FileItem> items = upload.parseRequest(req);
File thisFile = new File(repository, filename);
try (InputStream input = file.getInputStream()) {
Files.copy(input, thisFile.toPath());
}
} catch (FileUploadException e) {
e.printStackTrace();
}
這是堆棧跟蹤:
java.nio.file.NoSuchFileException: ./uploads/photo.jpeg
java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:116)
java.base/sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:219)
java.base/java.nio.file.spi.FileSystemProvider.newOutputStream(FileSystemProvider.java:478)
java.base/java.nio.file.Files.newOutputStream(Files.java:223)
java.base/java.nio.file.Files.copy(Files.java:3143)
com.marcosvalens.controller.UserFormController.doPost(UserFormController.java:82)
javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
com.marcosvalens.interceptor.RequestLoginFilter.doFilter(RequestLoginFilter.java:39)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
您創建了一個DiskFileItemFactory
,然后,顯然,您祈禱它會做一些事情。 這不是你使用這個 API 的方式; 您必須將factory
變量傳遞給構造函數: new ServletFileUpload(factory)
。 您的代碼段不包含此內容; 大概它會比你粘貼的更遠。
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