[英]request getParameter is always null when using enctype="multipart/form-data"
[英]File is always null in srpingboot 1.3.7 when processing multipart/form-data request
我正在尝试将 grails 应用程序与 springboot 应用程序通信。 我正在尝试将文件上传到 springboot 应用程序,该文件之前已上传到 grails。 这是我的springboot controller的代码:
@ResponseBody
@PostMapping(value = "/save", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
def save(@Valid @ModelAttribute SaveRequest request) {
//Some logic
}
saveRequest class 包含一些需要应用于请求的验证
class SaveHotelAccreditationRequest {
//Other fields
@NotNull
MultipartFile image
}
我已经像这样在 application.properties 文件中设置了属性
spring.http.multipart.enabled = true
spring.http.multipart.location=/home/user/temp
我正在使用 Apache 的 commons-io 和 commons-fileupload 库。 我已经像这样设置了多部分解析器
@Bean(name = "multipartResolver")
public CommonsMultipartResolver multipartResolver() {
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
multipartResolver.setMaxUploadSize(2*1024*1024);
return multipartResolver;
}
这是我的 grails 应用程序中的代码
CredentialsProvider credsProvider = new BasicCredentialsProvider()
credsProvider.setCredentials(
AuthScope.ANY,
new UsernamePasswordCredentials(userName, password))
CloseableHttpClient httpclient = HttpClients.custom()
.setDefaultCredentialsProvider(credsProvider)
.build()
try {
HttpPost httpPost = new HttpPost(url)
MultipartEntityBuilder reqEntity = MultipartEntityBuilder.create()
reqEntity.setMode(HttpMultipartMode.BROWSER_COMPATIBLE)
reqEntity.addBinaryBody('image', file, ContentType.MULTIPART_FORM_DATA, file.getName())
//Other fields
httpPost.setEntity(reqEntity.build())
System.out.println("Executing request " + httpPost.getRequestLine())
CloseableHttpResponse response = httpclient.execute(httpPost)
try {
System.out.println("----------------------------------------")
System.out.println(response.getStatusLine())
System.out.println(EntityUtils.toString(response.getEntity()))
} finally {
response.close()
}
} finally {
httpclient.close()
}
当我运行请求时,我收到以下错误消息:
2020-05-02 02:37:24 | WARN | org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver - Resolved
exception caused by Handler execution: org.springframework.validation.BindException: org.springframework.validatio
n.BeanPropertyBindingResult: 1 errors
Field error in object 'saveHotelAccreditationRequest' on field 'image': rejected value [null]; codes [NotNull.saveRequest.image,NotNull.image,NotNull.org.springframework.web.multipart.MultipartFile,NotNull]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [saveRequest.image,image]; arguments []; default message [image]]; default message [may not be null]
我尝试使用 postman 并收到相同的错误消息。 我无法弄清楚我在这里缺少什么,任何帮助将不胜感激。
在用于多部分 API 的 Spring-Boot REST 中,我正在编写这样的多部分 API
@PostMapping("/upload-doc")
@ApiImplicitParam(paramType = "body", name = "payload", dataType = "UploadDocRequest")
@ResponseStatus(HttpStatus.CREATED)
@ApiOperation("Upload User's documents")
public UploadDocRequest uploadDocRequest(
@RequestPart("payload") UploadDocRequest payload, @RequestPart("docs") MultipartFile[] docs) {
Spring yaml 中的多部分配置
spring:
servlet:
multipart:
max-file-size: 5MB
max-request-size: 5MB
在使用 Multipart 时,以下内容在 Spring 引导中对我有用。
@PostMapping(value = "/uploadVideo")
public void uploadVideo(HttpServletRequest request, HttpServletResponse response,
@RequestParam("file") MultipartFile file) throws Exception {
// logic here
}
并且您用于最大大小的多部分解析器可以像这样在属性文件中配置
# Max file size.
spring.servlet.multipart.max-file-size=200MB
# Max Request Size
spring.servlet.multipart.max-request-size=215MB
这是我从 Angular 应用程序这样调用的
var reqHeader=new HttpHeaders();
reqHeader.append('contentType','multipart/form-data')
let options = { headers: reqHeader, params: new HttpParams()
};
const formData = new FormData();
formData.append('file', file )
return this.http.post(this.url_toreadFile,formData,options)
希望它可以为您的实施提供一些帮助。
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