问题
Hello im writing an Webapplication using Spring Boot and AngularJs and need an simple file upload which is not working at the moment.
I already read that spring boot should autoconfigure the multipart upload itself when the mvc dependency is present. From :https://spring.io/guides/gs/uploading-files/
As part of auto-configuring Spring MVC, Spring Boot will create a MultipartConfigElement bean and make itself ready for file uploads.
Javascript Function which sends the Request:
var postFormData = function (file, url, successCallback, errorCallback, progressCallback) {
var xhr = new XMLHttpRequest(),
formData = new FormData();
formData.append("file", file);
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
if (xhr.status === 200) {
successCallback(xhr.status); //File is Uploaded
} else {
errorCallback(xhr.status);
}
}
};
function progress(evt) {
if (evt.lengthComputable) {
var percentComplete = evt.loaded / evt.total;
progressCallback(percentComplete);
} else {
progressCallback(evt.loaded);
}
}
xhr.open("POST", url, true);
//xhr.setRequestHeader("Content-Type", "multipart/form-data");
xhr.addEventListener("progress", progress, false);
xhr.send(formData);
}
Multipart configuration Bean in my main app class:
@Bean
MultipartConfigElement multipartConfigElement() {
MultipartConfigFactory factory = new MultipartConfigFactory();
factory.setMaxFileSize(MAXIMUM_FILE_SIZE);
factory.setMaxRequestSize(MAXIMUM_FILE_SIZE);
return factory.createMultipartConfig();
}
Upload Controller:
@Controller
@RequestMapping("/api")
public class FileUploadController {
@Autowired
UserRepository userRepository;
@Autowired
VolumeMetaRepository volumeMetaRepository;
/**
* Handles File upload of volumedata
*
* @param file Must not be null
**/
@RequestMapping(value = "/volumedata/meta/test", consumes= "multipart/form-data", method=RequestMethod.POST)
@ResponseBody
public void handleFileUpload(
@RequestParam("file") MultipartFile file) {
if (!file.isEmpty()) {
/* try {
InputStream fileStream = file.getInputStream();
OutputStream out = new FileOutputStream(file.getOriginalFilename());
IOUtils.copy(fileStream, out);
} catch (IOException e) {
throw new IllegalStateException("Error uploading file.", e);
}*/
/* String filePath = request.getServletContext().getRealPath("/");
try {
file.transferTo(new File(filePath+ "/" + file.getOriginalFilename()));
} catch (IOException e) {
e.printStackTrace();
}*/
}
}
And because there are other Stackoverflow Threads were a new Spring boot Version solved the issue Im using '1.2.2.BUILD-SNAPSHOT', my gradle dependencies:
version = '1.2.2.BUILD-SNAPSHOT'
dependencies {
compile group: 'org.springframework.boot', name: 'spring-boot-starter-web', version:version
compile group: 'org.springframework.boot', name: 'spring-boot-starter-aop', version:version
compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-jpa', version:version
compile group: 'org.springframework.hateoas', name: 'spring-hateoas', version:'0.16.0.RELEASE'
compile group: 'org.springframework.data', name: 'spring-data-rest-webmvc', version:'2.1.4.RELEASE'
compile group: 'org.springframework.boot', name: 'spring-boot-starter-security', version:version
compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-rest', version:version
compile group: 'commons-io', name: 'commons-io', version:'2.1'
compile group: 'com.fasterxml.jackson.datatype', name: 'jackson-datatype-jsr310', version:'2.3.4'
compile group: 'org.springframework.boot', name: 'spring-boot-starter-integration', version:version
compile group: 'org.springframework.boot', name: 'spring-boot-starter-websocket', version:version
compile group: 'org.springframework.session', name: 'spring-session', version:'1.0.0.BUILD-SNAPSHOT'
compile group: 'org.springframework.data', name: 'spring-data-redis', version:'1.4.1.RELEASE'
compile group: 'redis.clients', name: 'jedis', version:'2.4.2'
compile group: 'org.springframework.boot', name: 'spring-boot-starter-remote-shell', version:version
compile group:'com.google.guava', name:'guava', version:'18.0'
compile files ('lib/vendor/niftijio.jar');
compile("com.h2database:h2")
testCompile(group: 'org.springframework.boot', name: 'spring-boot-starter-test', version:'1.1.6.RELEASE') {
exclude(module: 'commons-logging')
}
testCompile group: 'com.jayway.jsonpath', name: 'json-path', version:'0.9.1'
testCompile 'org.springframework:spring-test:3.2.3.RELEASE'
testCompile 'junit:junit:4.+'
testCompile "org.mockito:mockito-all:1.9.5"
}
The thrown error is:
{
"timestamp" : "2015-01-19T10:22:53.710Z",
"status" : 400,
"error" : "Bad Request",
"exception" : "org.springframework.web.bind.MissingServletRequestParameterException",
"message" : "Required MultipartFile parameter 'file' is not present",
"path" : "/api/volumedata/meta/test"
}
It tells me that the "file" parameter is not present, but my Request payload shows that the parameter is there.
Request Payload:
------WebKitFormBoundary40qPAhpvA20pd8V1
Content-Disposition: form-data; name="file"
C:\fakepath\test.gz
------WebKitFormBoundary40qPAhpvA20pd8V1--
Has somebody an Idea what is missing in my configuration, or what could cause the error ?
Thanks in advance
回答1:
I found the reason for the error. It originated not from my Spring controller, but from my angularJS html code.
This was my Upload Input field:
<div class="form-group"
ng-class="{ 'has-error': volume_upload_form.file_field.$invalid && volume_upload_form.file_field.$dirty}">
<label name=file-field-label>Volume Dataset</label>
<input value=file
name=file
ng-model=upload.file
required
id=file
file_ext_validation
type="file"
extensions="nii,NII,gz,jpeg,JPG"/>
<div class="error"
ng-show="volume_upload_form.volume.$invalid">
<small class="error"
ng-show="volume_upload_form.volume.$error.fileExtValidation">
File must be of type ".nii"
</small>
</div>
</div>
As you can see is use the default ng-model too communicate with my angular controller("upload" is my Controller alias).
ng-model=upload.file
But Angular does not support the file input html field by default. So only a string containing the file path was stored in upload.file, NOT an actual File Object. I had to write a custom directive:
var fileModel = function ($parse) {
return {
restrict: 'A',
link: function(scope, element, attrs) {
var model = $parse(attrs.fileModel);
var modelSetter = model.assign;
element.bind('change', function () {
scope.$apply(function () {
modelSetter(scope, element[0].files[0]);
});
});
}
};
}
module.exports = fileModel;
Which returns the actual File object. My new upload html code was as follows:
<div class="form-group"
ng-class="{ 'has-error': volume_upload_form.file_field.$invalid && volume_upload_form.file_field.$dirty}">
<label name=file-field-label>Volume Dataset</label>
<input name=file
file-model="upload.fileModel"
ng-model="file"
required
file_ext_validation
type="file"
extensions="nii,NII,gz,jpeg,JPG"/>
<div class="error"
ng-show="volume_upload_form.volume.$invalid">
<small class="error"
ng-show="volume_upload_form.volume.$error.fileExtValidation">
File must be of type ".nii"
</small>
</div>
</div>
you can see
file-model="upload.fileModel"
links the File Object from the file input field to the angular controller. Here is the correct Request Payload.
------WebKitFormBoundaryR1AXAwLepSUKJB3i
Content-Disposition: form-data; name="file"; filename="test.nii.gz"
Content-Type: application/x-gzip
------WebKitFormBoundaryR1AXAwLepSUKJB3i--
来源：https://stackoverflow.com/questions/28022685/spring-boot-file-upload-bad-request-400