所需的 MultipartFile 参数“文件"不存在 [英] Required MultipartFile parameter 'file' is not present

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本文介绍了所需的 MultipartFile 参数“文件"不存在的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在使用 Spring Boot 来测试上传功能，并得到'所需的 MultipartFile 参数'文件'不存在'错误.以下是 1) JSP，2) 控制器 3) 配置类 4) 嵌入式 tomcat 日志.

I am using Spring Boot to test a upload functionality, and getting 'Required MultipartFile parameter 'file' is not present' error. Following are the 1) JSP, 2) Controller 3) Config Class 4) embedded tomcat log.

  1. JSP 页面

  1. JSP page

----------------------------------------------------------------------------
<!DOCTYPE html>

<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<html lang="en">

<body>
    <br>Message: ${message}
    <h2>List Of Objects</h2>

    <br>
    <h2>Upload New File to this Bucket</h2>
    <form action="uploadObject" method="post" enctype="multipart/form-data">
        <table width="60%" border="1" cellspacing="0">
            <tr>
                <td width="35%"><strong>File to upload</strong></td>
                <td width="65%"><input type="file" name="file" /></td>
            </tr>
            <tr>
                <td>&nbsp;</td>
                <td><input type="submit" name="submit" value="Add" /></td>
            </tr>
        </table>
    </form>
</body>
</html>

2.控制器:

@RequestMapping(value = "/uploadObject", method = RequestMethod.POST)
    @Override
    public String upload(@RequestParam("file") MultipartFile file,
            @RequestParam("bucketName") String bucketName,
            Map<String, Object> model) {

        LOG.info("Object name parameter is " + file.getOriginalFilename());
        LOG.info("Bucket name parameter is " + bucketName);
....
}

3) 配置类:

package com.phi.piranha.client.config;

import javax.servlet.MultipartConfigElement;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.embedded.MultiPartConfigFactory;
import org.springframework.boot.context.web.SpringBootServletInitializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

@Configuration
@EnableAutoConfiguration
@ComponentScan("com.phi.piranha")
public class PiranhaStorageServiceClientApplication extends
        SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(
            final SpringApplicationBuilder application) {
        return application
                .sources(PiranhaStorageServiceClientApplication.class);
    }

    @SuppressWarnings("PMD.SignatureDeclareThrowsException")
    public static void main(final String[] args) throws Exception {
        SpringApplication.run(PiranhaStorageServiceClientApplication.class,
                args);
    }

    @Bean
    MultipartConfigElement multipartConfigElement() {
        MultiPartConfigFactory factory = new MultiPartConfigFactory();
        factory.setMaxFileSize("1024KB");
        factory.setMaxRequestSize("1024KB");
        return factory.createMultipartConfig();
    }

    @Bean
    CommonsMultipartResolver multipartResolver(){
        return new CommonsMultipartResolver();
    }
}

4) 嵌入式 Tomcat 日志:

4) Emedded Tomcat log: 

  .   ____          _            __ _ _
 /\ / ___'_ __ _ _(_)_ __  __ _    
( ( )\___ | '_ | '_| | '_ / _` |    
 \/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::            (v1.0.0.RC4)

2014-03-28 14:41:01.216  INFO 2852 --- [           main] c.PiranhaStorageServiceClientApplication : Starting PiranhaStorageServiceClientApplication on USDSFOSFC1NBOPY with PID 2852 (C:aworkspacesandboxs3-poc-client	argetclasses started by 310152252)
2014-03-28 14:41:01.220 DEBUG 2852 --- [           main] o.s.boot.SpringApplication               : Loading source class com.phi.piranha.client.config.PiranhaStorageServiceClientApplication
2014-03-28 14:41:01.270  INFO 2852 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6f434304: startup date [Fri Mar 28 14:41:01 PDT 2014]; root of context hierarchy
2014-03-28 14:41:01.273 DEBUG 2852 --- [           main] ationConfigEmbeddedWebApplicationContext : Bean factory for org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6f434304: org.springframework.beans.factory.support.DefaultListableBeanFactory@62b08658: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,piranhaStorageServiceClientApplication]; root of factory hierarchy
2014-03-28 14:41:01.897  INFO 2852 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Overriding bean definition for bean 'multipartResolver': replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=piranhaStorageServiceClientApplication; factoryMethodName=multipartResolver; initMethodName=null; destroyMethodName=(inferred); defined in class com.phi.piranha.client.config.PiranhaStorageServiceClientApplication] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.MultipartAutoConfiguration; factoryMethodName=multipartResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/MultipartAutoConfiguration.class]]
2014-03-28 14:41:02.188 DEBUG 2852 --- [           main] ationConfigEmbeddedWebApplicationContext : Using MessageSource [org.springframework.context.support.ResourceBundleMessageSource: basenames=[messages]]
2014-03-28 14:41:02.189 DEBUG 2852 --- [           main] ationConfigEmbeddedWebApplicationContext : Using ApplicationEventMulticaster [org.springframework.context.event.SimpleApplicationEventMulticaster@58a1c2bf]
2014-03-28 14:41:02.495 DEBUG 2852 --- [           main] .t.TomcatEmbeddedServletContainerFactory : Code archive: C:Users310152252.m2
epositoryorgspringframeworkootspring-boot1.0.0.RC4spring-boot-1.0.0.RC4.jar
2014-03-28 14:41:02.495 DEBUG 2852 --- [           main] .t.TomcatEmbeddedServletContainerFactory : Code archive: C:Users310152252.m2
epositoryorgspringframeworkootspring-boot1.0.0.RC4spring-boot-1.0.0.RC4.jar
2014-03-28 14:41:02.496 DEBUG 2852 --- [           main] .t.TomcatEmbeddedServletContainerFactory : Document root: C:aworkspacesandboxs3-poc-clientsrcmainwebapp
2014-03-28 14:41:02.546  INFO 2852 --- [           main] .t.TomcatEmbeddedServletContainerFactory : Server initialized with port: 9090
2014-03-28 14:41:02.884  INFO 2852 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
2014-03-28 14:41:02.885  INFO 2852 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/7.0.52
2014-03-28 14:41:03.077  INFO 2852 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2014-03-28 14:41:03.077  INFO 2852 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1811 ms
2014-03-28 14:41:03.810  INFO 2852 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean        : Mapping servlet: 'dispatcherServlet' to [/]
2014-03-28 14:41:03.813  INFO 2852 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2014-03-28 14:41:04.356  INFO 2852 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2014-03-28 14:41:04.483  INFO 2852 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2014-03-28 14:41:04.483  INFO 2852 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2014-03-28 14:41:04.744  INFO 2852 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2014-03-28 14:41:04.763 DEBUG 2852 --- [           main] ationConfigEmbeddedWebApplicationContext : Unable to locate LifecycleProcessor with name 'lifecycleProcessor': using default [org.springframework.context.support.DefaultLifecycleProcessor@11a91abc]
2014-03-28 14:41:04.765 DEBUG 2852 --- [           main] utoConfigurationReportLoggingInitializer : 


=========================
AUTO-CONFIGURATION REPORT
=========================


Positive matches:
-----------------

   MessageSourceAutoConfiguration
      - @ConditionalOnMissingBean (types: org.springframework.context.MessageSource; SearchStrategy: all) found no beans (OnBeanCondition)

   PropertyPlaceholderAutoConfiguration#propertySourcesPlaceholderConfigurer
      - @ConditionalOnMissingBean (types: org.springframework.context.support.PropertySourcesPlaceholderConfigurer; SearchStrategy: current) found no beans (OnBeanCondition)

   JmxAutoConfiguration
      - @ConditionalOnClass classes found: org.springframework.jmx.export.MBeanExporter (OnClassCondition)
      - SpEL expression on org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration: ${spring.jmx.enabled:true} (OnExpressionCondition)
      - @ConditionalOnMissingBean (types: org.springframework.jmx.export.MBeanExporter; SearchStrategy: all) found no beans (OnBeanCondition)

   DispatcherServletAutoConfiguration
      - found web application StandardServletEnvironment (OnWebApplicationCondition)
      - @ConditionalOnClass classes found: org.springframework.web.servlet.DispatcherServlet (OnClassCondition)

   DispatcherServletAutoConfiguration.DispatcherServletConfiguration
      - no DispatcherServlet found (DispatcherServletAutoConfiguration.DefaultDispatcherServletCondition)
      - @ConditionalOnClass classes found: javax.servlet.ServletRegistration (OnClassCondition)

   EmbeddedServletContainerAutoConfiguration
      - found web application StandardServletEnvironment (OnWebApplicationCondition)

   EmbeddedServletContainerAutoConfiguration.EmbeddedTomcat
      - @ConditionalOnClass classes found: javax.servlet.Servlet,org.apache.catalina.startup.Tomcat (OnClassCondition)
      - @ConditionalOnMissingBean (types: org.springframework.boot.context.embedded.EmbeddedServletContainerFactory; SearchStrategy: current) found no beans (OnBeanCondition)

   HttpMessageConvertersAutoConfiguration
      - @ConditionalOnClass classes found: org.springframework.http.converter.HttpMessageConverter (OnClassCondition)

   HttpMessageConvertersAutoConfiguration#messageConverters
      - @ConditionalOnMissingBean (types: org.springframework.boot.autoconfigure.web.HttpMessageConverters; SearchStrategy: all) found no beans (OnBeanCondition)

   HttpMessageConvertersAutoConfiguration.ObjectMappers
      - @ConditionalOnClass classes found: com.fasterxml.jackson.databind.ObjectMapper (OnClassCondition)

   HttpMessageConvertersAutoConfiguration.ObjectMappers#jacksonObjectMapper
      - @ConditionalOnMissingBean (types: com.fasterxml.jackson.databind.ObjectMapper; SearchStrategy: all) found no beans (OnBeanCondition)

   HttpMessageConvertersAutoConfiguration.ObjectMappers#mappingJackson2HttpMessageConverter
      - @ConditionalOnMissingBean (types: org.springframework.http.converter.json.MappingJackson2HttpMessageConverter; SearchStrategy: all) found no beans (OnBeanCondition)

   MultipartAutoConfiguration
      - @ConditionalOnClass classes found: javax.servlet.Servlet,org.springframework.web.multipart.support.StandardServletMultipartResolver (OnClassCondition)
      - @ConditionalOnBean (types: javax.servlet.MultipartConfigElement; SearchStrategy: all) found the following [multipartConfigElement] (OnBeanCondition)

   ServerPropertiesAutoConfiguration
      - found web application StandardServletEnvironment (OnWebApplicationCondition)

   ServerPropertiesAutoConfiguration#serverProperties
      - @ConditionalOnMissingBean (types: org.springframework.boot.autoconfigure.web.ServerProperties; SearchStrategy: current) found no beans (OnBeanCondition)

   WebMvcAutoConfiguration
      - found web application StandardServletEnvironment (OnWebApplicationCondition)
      - @ConditionalOnClass classes found: javax.servlet.Servlet,org.springframework.web.servlet.DispatcherServlet,org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter (OnClassCondition)
      - @ConditionalOnMissingBean (types: org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport; SearchStrategy: all) found no beans (OnBeanCondition)

   WebMvcAutoConfiguration#hiddenHttpMethodFilter
      - @ConditionalOnMissingBean (types: org.springframework.web.filter.HiddenHttpMethodFilter; SearchStrategy: all) found no beans (OnBeanCondition)

   WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter#defaultViewResolver
      - @ConditionalOnMissingBean (types: org.springframework.web.servlet.view.InternalResourceViewResolver; SearchStrategy: all) found no beans (OnBeanCondition)

   WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter#requestContextListener
      - @ConditionalOnMissingBean (types: org.springframework.web.context.request.RequestContextListener; SearchStrategy: all) found no beans (OnBeanCondition)


Negative matches:
-----------------

   RabbitAutoConfiguration
      - required @ConditionalOnClass classes not found: org.springframework.amqp.rabbit.core.RabbitTemplate,com.rabbitmq.client.Channel (OnClassCondition)

   AopAutoConfiguration
      - required @ConditionalOnClass classes not found: org.aspectj.lang.annotation.Aspect,org.aspectj.lang.reflect.Advice (OnClassCondition)

   BatchAutoConfiguration
      - required @ConditionalOnClass classes not found: org.springframework.batch.core.launch.JobLauncher,org.springframework.jdbc.core.JdbcOperations (OnClassCondition)

   JpaRepositoriesAutoConfiguration
      - required @ConditionalOnClass classes not found: org.springframework.data.jpa.repository.JpaRepository (OnClassCondition)

   MongoRepositoriesAutoConfiguration
      - required @ConditionalOnClass classes not found: com.mongodb.Mongo,org.springframework.data.mongodb.repository.MongoRepository (OnClassCondition)

   MongoTemplateAutoConfiguration
      - required @ConditionalOnClass classes not found: com.mongodb.Mongo,org.springframework.data.mongodb.core.MongoTemplate (OnClassCondition)

   DataSourceAutoConfiguration
      - required @ConditionalOnClass classes not found: org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType (OnClassCondition)

   DataSourceTransactionManagerAutoConfiguration
      - required @ConditionalOnClass classes not found: org.springframework.jdbc.core.JdbcTemplate,org.springframework.transaction.PlatformTransactionManager (OnClassCondition)

   JmsTemplateAutoConfiguration
      - required @ConditionalOnClass classes not found: org.springframework.jms.core.JmsTemplate,javax.jms.ConnectionFactory (OnClassCondition)

   DeviceResolverAutoConfiguration
      - required @ConditionalOnClass classes not found: org.springframework.mobile.device.DeviceResolverHandlerInterceptor,org.springframework.mobile.device.DeviceHandlerMethodArgumentResolver (OnClassCondition)

   MongoAutoConfiguration
      - required @ConditionalOnClass classes not found: com.mongodb.Mongo (OnClassCondition)

   HibernateJpaAutoConfiguration
      - did not find HibernateEntityManager class (HibernateJpaAutoConfiguration.HibernateEntityManagerCondition)

   ReactorAutoConfiguration
      - required @ConditionalOnClass classes not found: reactor.spring.context.config.EnableReactor (OnClassCondition)

   RedisAutoConfiguration
      - required @ConditionalOnClass classes not found: org.springframework.data.redis.connection.lettuce.LettuceConnection,org.springframework.data.redis.core.RedisOperations,com.lambdaworks.redis.RedisClient (OnClassCondition)

   SecurityAutoConfiguration
      - required @ConditionalOnClass classes not found: org.springframework.security.authentication.AuthenticationManager (OnClassCondition)

   ThymeleafAutoConfiguration
      - required @ConditionalOnClass classes not found: org.thymeleaf.spring4.SpringTemplateEngine (OnClassCondition)

   EmbeddedServletContainerAutoConfiguration.EmbeddedJetty
      - required @ConditionalOnClass classes not found: org.eclipse.jetty.server.Server,org.eclipse.jetty.util.Loader (OnClassCondition)

   WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter#beanNameViewResolver
      - @ConditionalOnBean (types: org.springframework.web.servlet.View; SearchStrategy: all) found no beans (OnBeanCondition)

   WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter#viewResolver
      - @ConditionalOnBean (types: org.springframework.web.servlet.View; SearchStrategy: all) found no beans (OnBeanCondition)

   WebSocketAutoConfiguration
      - required @ConditionalOnClass classes not found: org.springframework.web.socket.WebSocketHandler (OnClassCondition)



2014-03-28 14:41:04.821  INFO 2852 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port: 9090
2014-03-28 14:41:04.829  INFO 2852 --- [           main] c.PiranhaStorageServiceClientApplication : Started PiranhaStorageServiceClientApplication in 4.231 seconds (JVM running for 5.249)

推荐答案

我发现 Spring Boot 中的 MultipartAutoConfiguration 存在问题.我禁用了它并在 web 配置中添加了 @Bean 并且它起作用了.基于异常，我看到 Jackson Mapper 试图解析多部分内容而不是多部分解析器本身.

I figured out that there is an issue with the MultipartAutoConfiguration within spring boot. I disabled it and added @Bean in the web config and it worked. Based on the exception I saw that the Jackson Mapper was trying to resolve the multipart content instead of the multipart resolver itself.

这是片段.

@EnableAutoConfiguration(exclude={MultipartAutoConfiguration.class}

在您的 webconfig 类中添加以下内容

Add the following in your webconfig class

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {

@Bean(name = "multipartResolver")
public CommonsMultipartResolver multipartResolver() {
    logger.info("Loading the multipart resolver");
    CommonsMultipartResolver multipartResolver 
            = new CommonsMultipartResolver();
    return multipartResolver;
}

这篇关于所需的 MultipartFile 参数“文件"不存在的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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