问题描述
我一直在尝试让我的 angular 6 项目将用户输入的 excel 文件以及一个 id 发送到 spring 后端 但是，我一直遇到 500 错误“所需的请求部分“文件”不存在。 我已经看到答案中说要删除内容标题，但后来我收到一条错误消息，说后端需要一个多部分文件。
我不确定在哪里缺少内容类型或参数。
Spring 后端
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.multipart.multipartfile;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import javax.servlet.MultipartConfigElement;
@Controller
@CrossOrigin
public class ExcelUploadController {
protected static final HttpHeaders BASIC_HEADERS;
static {
HttpHeaders headers = new HttpHeaders();
headers.add("x-frame-options","SAMEORIGIN");
BASIC_HEADERS = headers;
}
@Bean
public MultipartConfigElement multipartConfigElement() {
return new MultipartConfigElement("");
}
@Bean
public CommonsMultipartResolver multipartResolver() {
org.springframework.web.multipart.commons.CommonsMultipartResolver multipartResolver = new org.springframework.web.multipart.commons.CommonsMultipartResolver();
multipartResolver.setMaxUploadSize(1000000);
return multipartResolver;
}
@Autowired
private ExcelProcessorService excelProcessorService;
@PostMapping(path="/uploadExcel",consumes = "multipart/form-data")
public ResponseEntity<String> handleFileUpload(@RequestPart("file") multipartfile file,@RequestPart("validation_set_id") String validationSetId) {
excelProcessorService.process(file,validationSetId);
String response = "Validation Set Id: "+validationSetId;
return new ResponseEntity(response,BASIC_HEADERS,HttpStatus.OK);
}
}
Angular 前端（FileInfoModel 数据为 File 类型）
public uploadFile(file: FileInfoModel,url :string,validationSetId:string) {
console.log("Starting upload in file servuce with file {} ",file.data.name);
//Move this to service
const fd = new FormData();
var textInput = new Blob([validationSetId],{
type: 'application/json'
});
fd.append("file",file.data,file.data.name);
fd.append("validation_set_id",textInput);
console.log(fd.getAll("file"))
//var param = new HttpParams().set('validation_set_id',validationSetId)
const req = new HttpRequest('POST',url,fd,{
headers: new HttpHeaders({
'Accept': 'application/json','Content-Type': 'multipart/form-data; boundary=---------------------------293582696224464','Authorization':'Bearer '+this.storageService.persGet('okta.token')
}),reportProgress: true
});
file.inProgress = true;
return this._http.request(req).pipe(
map(event => {
console.log("update event of type {}",event.type)
switch (event.type) {
case HttpEventType.UploadProgress:
file.progress = Math.round(event.loaded * 100 / event.total);
break;
case HttpEventType.Response:
return event;
}
}),tap(message => {console.log(message)}),last(),catchError((error: HttpErrorResponse) => {
console.log("error!!!{} {} ",error.message,error.error)
file.inProgress = false;
file.canRetry = true;
return of(`${file.data.name} upload Failed.`);
})).subscribe(
(event: any) => {
console.log("woooo event of type {}",event);
}
);
}
在后端我得到这个堆栈跟踪
handling error: 500 INTERNAL_SERVER_ERROR,code: INTERNAL_SERVER_ERROR
org.springframework.web.multipart.support.MissingServletRequestPartException: required request part 'file' is not present
at org.springframework.web.servlet.mvc.method.annotation.RequestPartMethodArgumentResolver.resolveArgument(RequestPartMethodArgumentResolver.java:161)
at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121)
at org.springframework.web.method.support.invocableHandlerMethod.getmethodArgumentValues(invocableHandlerMethod.java:167)
at org.springframework.web.method.support.invocableHandlerMethod.invokeForRequest(invocableHandlerMethod.java:134)
at org.springframework.web.servlet.mvc.method.annotation.ServletinvocableHandlerMethod.invokeAndHandle(ServletinvocableHandlerMethod.java:106)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:888)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.dispatcherServlet.dodispatch(dispatcherServlet.java:1040)
at org.springframework.web.servlet.dispatcherServlet.doService(dispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at brave.servlet.TracingFilter.doFilter(TracingFilter.java:68)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at brave.servlet.TracingFilter.doFilter(TracingFilter.java:87)
at org.springframework.cloud.sleuth.instrument.web.LazyTracingFilter.doFilter(TraceWebServletAutoConfiguration.java:139)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcmetricsFilter.doFilterInternal(WebMvcmetricsFilter.java:108)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1598)
at org.apache.tomcat.util.net.socketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
您可以在前端看到，当我使用 RequestParam 注释而不是当前的 RequestPart 时，我也尝试将validationsetid 作为普通参数发送
感谢任何帮助。
编辑： 我做过的各种事情： 删除内容类型 - 得到的错误异常是 org.springframework.web.multipart.MultipartException：当前请求不是多部分请求
make content-type:undefined- 得到错误，说没有 undefined 的长度值
解决方法
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