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MultipartFile 始终为 NULL

[英]MultipartFile is always NULL

 原文  2020-07-20 15:47:41  9   2    java/ multipartform-data/ jersey-1.0/ multipartfile

问题描述

使用 MultipartFile 上传文件时遇到问题。 每当我上传时，我都在使用 Spring v2.2.6.RELEASE 得到值字符串，但文件是 NULL。 下面是我的代码

上传控制器.java

 @POST
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    public Response upload(@BeanParam AttachmentRequestDTO attachmentRequestDTO) {
        log.info("Hello - from upload endpoint");
        log.info("senderId: "+ attachmentRequestDTO.getSenderId());
        log.info("groupId: "+ attachmentRequestDTO.getGroupId());
        log.info("file: "+ attachmentRequestDTO.getFile().isEmpty());
        return Response.status(200).entity("test123").build();
    
    }

附件请求DTO

public class AttachmentRequestDTO {

    @FormDataParam("file")
    private MultipartFile file;

    @FormDataParam("senderId")
    private String senderId;

    @FormDataParam("groupId")
    private String groupId;

...

配置java

@Configuration
public class Config {

    @Bean(name="multipartResolver")
    public MultipartResolver multipartResolver(){
        CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver();
        commonsMultipartResolver.setDefaultEncoding("utf-8");
        commonsMultipartResolver.setMaxUploadSize(20000000);
        commonsMultipartResolver.setResolveLazily(false);
        return commonsMultipartResolver;
    }
}

SpringApplication.java

@SpringBootApplication
public class AttachmentApiApplication extends BaseMerakApplication {

    public static void main(String[] args) {
        SpringApplication.run(AttachmentApiApplication.class, args);
    }

    @Bean
    protected Consumer<ResourceConfig> customJerseyConfig() {
        return resourceConfig -> {
            resourceConfig.register(MultiPartFeature.class);
            resourceConfig.register(Config.class);
        };
    }

    @Bean
    public RequestContextFilter requestContextFilter() {
        return new RequestContextFilter();
    }
}

这是点击 postman 时的屏幕截图邮递员表单数据

这是日志文件的屏幕截图结果。 如您所见，我可以获得字符串的值，但我得到的文件始终是 null。 我尝试在配置文件中添加 multipartResolver，因为这解决了他们的问题，但对我来说，我没有得到相同的结果。 有没有人遇到过这个问题，你是如何解决这个问题的。 是否有特定版本的 jersey 可用于此？

2020-07-21 12:42:19.774  INFO 17683 --- [nio-8092-exec-1] c.i.c.a.a.p.FileUploadController         : Hello - from upload endpoint
2020-07-21 12:42:19.774  INFO 17683 --- [nio-8092-exec-1] c.i.c.a.a.p.FileUploadController         : senderId: testCjid123
2020-07-21 12:42:19.774  INFO 17683 --- [nio-8092-exec-1] c.i.c.a.a.p.FileUploadController         : groupId: ChannelId123
2020-07-21 12:42:19.779 ERROR 17683 --- [nio-8092-exec-1] c.i.a.t.s.f.ThrowableProcessingFilter    : An unexpected exception occurred while handling the request
javax.servlet.ServletException: java.lang.NullPointerException
        at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:410) ~[jersey-container-servlet-core-2.30.1.jar:na]
        at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346) ~[jersey-container-servlet-core-2.30.1.jar:na]
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:366) ~[jersey-container-servlet-core-2.30.1.jar:na]
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:319) ~[jersey-container-servlet-core-2.30.1.jar:na]
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205) ~[jersey-container-servlet-core-2.30.1.jar:na]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at com.ing.apisdk.toolkit.servlet.filter.LocalDtabFilter.$anonfun$doFilter$6(LocalDtabFilter.scala:48) ~[toolkit-servlet_2.12-11.1.0.jar:11.1.0]
        at com.ing.apisdk.toolkit.servlet.filter.LocalDtabFilter$$Lambda$1204.0000000000000000.apply$mcV$sp(Unknown Source) ~[na:na]
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) ~[scala-library-2.12.11.jar:na]
        at com.twitter.finagle.DtabCompanionBase.unwind(DtabBase.scala:338) ~[finagle-core_2.12-20.4.0.jar:20.4.0]
        at com.ing.apisdk.toolkit.servlet.filter.LocalDtabFilter.doFilter(LocalDtabFilter.scala:46) ~[toolkit-servlet_2.12-11.1.0.jar:11.1.0]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at com.ing.apisdk.toolkit.servlet.filter.AsyncAwareHttpServletFilter.$anonfun$callChain$1(AsyncAwareHttpServletFilter.scala:72) [toolkit-servlet_2.12-11.1.0.jar:11.1.0]
        at com.ing.apisdk.toolkit.servlet.filter.AsyncAwareHttpServletFilter$$Lambda$1166.0000000000000000.apply$mcV$sp(Unknown Source) ~[na:na]
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) ~[scala-library-2.12.11.jar:na]
        at scala.util.Try$.apply(Try.scala:213) ~[scala-library-2.12.11.jar:na]
        at com.ing.apisdk.toolkit.servlet.filter.AsyncAwareHttpServletFilter.callChain(AsyncAwareHttpServletFilter.scala:72) [toolkit-servlet_2.12-11.1.0.jar:11.1.0]
        at com.ing.apisdk.toolkit.tracing.servlet.TracingServletFilter.$anonfun$doFilter$1(TracingServletFilter.scala:61) ~[toolkit-tracing-servlet_2.12-11.1.0.jar:11.1.0]
        at com.ing.apisdk.toolkit.tracing.servlet.TracingServletFilter$$Lambda$1190.0000000000000000.apply$mcV$sp(Unknown Source) ~[na:na]
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) ~[scala-library-2.12.11.jar:na]
        at com.twitter.util.Local.let(Local.scala:4978) ~[util-core_2.12-20.4.0.jar:20.4.0]
        at com.twitter.finagle.context.LocalContext.letLocal(LocalContext.scala:51) ~[finagle-core_2.12-20.4.0.jar:20.4.0]
        at com.twitter.finagle.context.LocalContext.let(LocalContext.scala:24) ~[finagle-core_2.12-20.4.0.jar:20.4.0]
        at com.ing.apisdk.toolkit.connectivity.tracing.core.OpenTracingContext$.withParentSpan(OpenTracingContext.scala:20) ~[toolkit-connectivity-tracing-core_2.12-11.1.0.jar:11.1.0]
        at com.ing.apisdk.toolkit.tracing.servlet.TracingServletFilter.doFilter(TracingServletFilter.scala:58) ~[toolkit-tracing-servlet_2.12-11.1.0.jar:11.1.0]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at com.ing.apisdk.toolkit.servlet.filter.AsyncAwareHttpServletFilter.$anonfun$callChain$1(AsyncAwareHttpServletFilter.scala:72) [toolkit-servlet_2.12-11.1.0.jar:11.1.0]
        at com.ing.apisdk.toolkit.servlet.filter.AsyncAwareHttpServletFilter$$Lambda$1166.0000000000000000.apply$mcV$sp(Unknown Source) ~[na:na]
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) ~[scala-library-2.12.11.jar:na]
        at scala.util.Try$.apply(Try.scala:213) ~[scala-library-2.12.11.jar:na]
        at com.ing.apisdk.toolkit.servlet.filter.AsyncAwareHttpServletFilter.callChain(AsyncAwareHttpServletFilter.scala:72) [toolkit-servlet_2.12-11.1.0.jar:11.1.0]
        at com.ing.apisdk.toolkit.servlet.filter.AsyncAwareHttpServletFilter.doFilter(AsyncAwareHttpServletFilter.scala:52) [toolkit-servlet_2.12-11.1.0.jar:11.1.0]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at com.ing.apisdk.toolkit.servlet.filter.AsyncAwareHttpServletFilter.$anonfun$callChain$1(AsyncAwareHttpServletFilter.scala:72) [toolkit-servlet_2.12-11.1.0.jar:11.1.0]
        at com.ing.apisdk.toolkit.servlet.filter.AsyncAwareHttpServletFilter$$Lambda$1166.0000000000000000.apply$mcV$sp(Unknown Source) ~[na:na]
        at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) ~[scala-library-2.12.11.jar:na]
        at scala.util.Try$.apply(Try.scala:213) ~[scala-library-2.12.11.jar:na]
        at com.ing.apisdk.toolkit.servlet.filter.AsyncAwareHttpServletFilter.callChain(AsyncAwareHttpServletFilter.scala:72) [toolkit-servlet_2.12-11.1.0.jar:11.1.0]
        at com.ing.apisdk.toolkit.servlet.filter.AsyncAwareHttpServletFilter.doFilter(AsyncAwareHttpServletFilter.scala:52) [toolkit-servlet_2.12-11.1.0.jar:11.1.0]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:688) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_232]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_232]
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33]
        at java.lang.Thread.run(Thread.java:819) [na:1.8.0_232]
Caused by: java.lang.NullPointerException: null
        at com.ing.contacting.attachments.api.presentation.FileUploadController.upload(FileUploadController.java:46) ~[classes/:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_232]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_232]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_232]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_232]
        at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52) ~[jersey-server-2.30.1.jar:na]
        at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$$Lambda$1272.0000000000000000.invoke(Unknown Source) ~[na:na]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:124) ~[jersey-server-2.30.1.jar:na]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:167) ~[jersey-server-2.30.1.jar:na]
        at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:176) ~[jersey-server-2.30.1.jar:na]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:79) ~[jersey-server-2.30.1.jar:na]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:469) ~[jersey-server-2.30.1.jar:na]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:391) ~[jersey-server-2.30.1.jar:na]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:80) ~[jersey-server-2.30.1.jar:na]
        at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:253) ~[jersey-server-2.30.1.jar:na]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248) ~[jersey-common-2.30.1.jar:na]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244) ~[jersey-common-2.30.1.jar:na]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:292) ~[jersey-common-2.30.1.jar:na]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:274) ~[jersey-common-2.30.1.jar:na]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:244) ~[jersey-common-2.30.1.jar:na]
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265) ~[jersey-common-2.30.1.jar:na]
        at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:232) ~[jersey-server-2.30.1.jar:na]
        at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:680) ~[jersey-server-2.30.1.jar:na]
        at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:394) ~[jersey-container-servlet-core-2.30.1.jar:na]
        ... 72 common frames omitted

也每当启动这个，日志警告告诉我 ConfigSetup.class 被忽略。 我不确定这是否是我拥有 NULL 指针的原因之一。

2020-07-21 21:02:29.352  WARN 51860 --- [           main] o.g.jersey.internal.inject.Providers     : A provider com.ing.contacting.attachments.api.settings.ConfigSetup registered in SERVER runtime does not implement any provider interfaces applicable in the SERVER runtime. Due to constraint configuration problems the provider com.ing.contacting.attachments.api.settings.ConfigSetup will be ignored.

2 个解决方案

解决方案1
 1  2020-07-20 15:57:22

form-data 部分在您的源代码中称为file ，而不是files 。

解决方案2
 0  2020-08-03 14:14:22

通过在 AttachmentRequestDTO class 上使用FormDataBodyPart而不是 MultipartFile 解决。

public class AttachmentRequestDTO {


@NotNull
@FormDataParam("file")
private FormDataBodyPart file;

@NotNull
@FormDataParam("senderId")
private String senderId;

@NotNull
@FormDataParam("groupId")
private String groupId;

暂无
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