英文:
Problem with uploading files to Spring Boot app using AJAX
问题
我在使用AJAX上传文件到我的Spring Boot应用程序时遇到了问题。我阅读了许多教程，观看了许多视频，但不知何故，对我仍然不起作用。我有一个名为`Account`的类，我想要上传头像到这个类中。以下是我的代码：JS：
inputAvatar.on('change', function(e) {
e.preventDefault();
var file = inputAvatar.prop('files')[0]
var formData = new FormData();
formData.append("file", file)
$.ajax({url: "/user/my-account/upload-avatar-image",type: "post",data: formData,enctype: 'multipart/form-data',cache: false,processData: false,contentType: false}).done(status => {console.log(status);});
});
Java：
@PostMapping(value = "/my-account/upload-avatar-image")
public int uploadAvatarImage(@RequestParam MultipartFile imageFile){
return accountService.uploadAvatarImage(imageFile);
}
public int uploadAvatarImage(MultipartFile imageFile){
String folder = this.getClass().getResource("/images/avatars").getPath();
try {
byte[] bytes = imageFile.getBytes();
Path path = Paths.get(folder + imageFile.getOriginalFilename());
Files.write(path, bytes);
} catch (IOException e) {
e.printStackTrace();
}
System.out.println(imageFile);
return 0;
}
当我上传文件时，我收到一个Java警告：> 2020-09-08 02:36:58.232 WARN 14140 --- [nio-8080-exec-2]> .w.s.m.s.DefaultHandlerExceptionResolver : Resolved> [org.springframework.web.multipart.support.MissingServletRequestPartException:> Required request part 'imageFile' is not present]而且在我的浏览器控制台中显示：> jquery-3.5.1.min.js:2 POST> http://localhost:8080/user/my-account/upload-avatar-image 400目前我不知道哪一方的代码有问题。是否有人可以解释一下我的代码有什么问题吗？
英文:
I'm struggling with uploading files to my Spring Boot app using AJAX. I read many tutorials, watched many videos and somehow, it still doesn't work for me. I have a class Account and i want to upload avatar to this. Here is my code:<br>
JS:
inputAvatar.on('change', function(e) {e.preventDefault();var file = inputAvatar.prop('files')[0]var formData = new FormData();formData.append("file", file)$.ajax({url: "/user/my-account/upload-avatar-image",type: "post",data: formData,enctype: 'multipart/form-data',cache: false,processData: false,contentType: false}).done(status => {console.log(status);});});
Java:
@PostMapping(value = "/my-account/upload-avatar-image")public int uploadAvatarImage(@RequestParam MultipartFile imageFile){return accountService.uploadAvatarImage(imageFile);}
public int uploadAvatarImage(MultipartFile imageFile){String folder = this.getClass().getResource("/images/avatars").getPath();try {byte[] bytes = imageFile.getBytes();Path path = Paths.get(folder + imageFile.getOriginalFilename());Files.write(path, bytes);} catch (IOException e) {e.printStackTrace();}System.out.println(imageFile);return 0;}
When i upload file i get a Java warning:<br>
> 2020-09-08 02:36:58.232 WARN 14140 --- [nio-8080-exec-2]
> .w.s.m.s.DefaultHandlerExceptionResolver : Resolved
> [org.springframework.web.multipart.support.MissingServletRequestPartException:
> Required request part 'imageFile' is not present]
and in the console of my browser:<br>
> jquery-3.5.1.min.js:2 POST
> http://localhost:8080/user/my-account/upload-avatar-image 400
and for now i don't know on which side there is a wrong piece of code.<br>
Can anyone explain to me what is wrong with my code?
答案1
得分: 0
好的，我有点儿笨，这相当简单。@RequestParam 必须与我放入 formData.append("file", file) 的内容匹配。所以在这种情况下，我需要将我附加到 formData 的值添加到 @RequestParam 中：
@RequestParam("file")
英文:
Ok, I'm kinda dumb, it was pretty easy. @RequestParam has to match what I put into formData.append("file", file). So in this case I need to add a value of what i append to formData to @RequestParam:
@RequestParam("file")
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