Question

我写了一个简单的控制器来上传文件：

@RestEndpoint
public class ImageController {
    @Autowired
    GridFsTemplate mTemplate;

    @RequestMapping(value = "images", method = RequestMethod.POST)
    public @ResponseBody String testPhoto(@RequestParam String name, @RequestParam String directory, @RequestParam MultipartFile file) throws IOException {

        if(!file.isEmpty()){
            final byte[] bytes = file.getBytes();
            InputStream inputStream = new ByteArrayInputStream(bytes);
            mTemplate.store(inputStream, "name");

            return "uploaded photo";
        }

        return "failed";
    }

}

@RestEndpoint注释是：

@Target({ ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Controller
public @interface RestEndpoint
{
    String value() default "";
}

我的ContextCOnfiguration类是：

@Configuration
@EnableWebMvc
@ComponentScan(
    basePackages = "com.questter.site",
    useDefaultFilters = false,
    includeFilters =
    @ComponentScan.Filter({RestEndpoint.class, RestEndpointAdvice.class})
)
public class RestServletContextConfiguration extends WebMvcConfigurerAdapter {
    @Bean
    public CommonsMultipartResolver multiPartResolver(){

        CommonsMultipartResolver resolver = new CommonsMultipartResolver();
        return resolver;
    }
...
}

---更新---

web.xml档案：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
                         http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
     version="3.1">

    <display-name>Spring Application</display-name>

    <jsp-config>
        <jsp-property-group>
            <url-pattern>*.jsp</url-pattern>
            <url-pattern>*.jspf</url-pattern>
            <page-encoding>UTF-8</page-encoding>
            <scripting-invalid>true</scripting-invalid>
            <include-prelude>/WEB-INF/jsp/base.jspf</include-prelude>
            <trim-directive-whitespaces>true</trim-directive-whitespaces>
            <default-content-type>text/html</default-content-type>
        </jsp-property-group>
    </jsp-config>

    <!--<context-param>-->
        <!--<param-name>spring.profiles.active</param-name>-->
        <!--<param-value>development</param-value>-->
    <!--</context-param>-->

    <session-config>
        <session-timeout>30</session-timeout>
        <cookie-config>
            <http-only>true</http-only>
        </cookie-config>
        <tracking-mode>COOKIE</tracking-mode>
    </session-config>

    <distributable />

</web-app>

----更新----

public class Bootstrap implements WebApplicationInitializer
{

    @Override
    public void onStartup(ServletContext container) throws ServletException
    {
        container.getServletRegistration("default").addMapping("/resource/*");

        AnnotationConfigWebApplicationContext rootContext =
            new AnnotationConfigWebApplicationContext();
        rootContext.register(RootContextConfiguration.class);
        container.addListener(new ContextLoaderListener(rootContext));

        AnnotationConfigWebApplicationContext webContext =
            new AnnotationConfigWebApplicationContext();
        webContext.register(WebServletContextConfiguration.class);
        ServletRegistration.Dynamic dispatcher = container.addServlet(
            "springWebDispatcher", new DispatcherServlet(webContext)
        );
        dispatcher.setLoadOnStartup(1);
        dispatcher.setMultipartConfig(new MultipartConfigElement(
            null, 20_971_520L, 41_943_040L, 512_000
        ));
        dispatcher.addMapping("/");

        AnnotationConfigWebApplicationContext restContext =
                new AnnotationConfigWebApplicationContext();
        restContext.register(RestServletContextConfiguration.class);
        DispatcherServlet servlet = new DispatcherServlet(restContext);
        servlet.setDispatchOptionsRequest(true);
        dispatcher = container.addServlet(
                "springRestDispatcher", servlet
        );
        dispatcher.setLoadOnStartup(2);
        dispatcher.addMapping("/rest/*");

        rootContext.refresh();
        DbBootstrap dbBootstrap = rootContext.getBean(DbBootstrap.class);
        dbBootstrap.init();

    }


}

当执行帖子请求（使用邮递员）时，我得到：

HTTP Status 500 - Request processing failed; nested exception is java.lang.IllegalArgumentException:Expected MultipartHttpServletRequest: is a MultipartResolver configured

我已经通过stackoverflow查看了一些类似的问题，但没有一个答案有帮助我

Spring版本是：4.0.4

任何帮助将不胜感激（当然竖起大拇指）。

由于

Answer 1

我不知道他们为什么这样做，但上下文中的MultipartResolver bean需要命名为multipartResolver。将您的@Bean方法重命名为

public CommonsMultipartResolver multipartResolver(){ // lowercase 'P'

或明确指定名称

@Bean(name = "multipartResolver")
public CommonsMultipartResolver canBeCalledAnything(){

Answer 2

allowCasualMultipartParsing="true"

在context.xml中的context标签上，它对我起作用

Answer 3

除了没有找到多部件配置之外，它是直接的。虽然您提供了 multipartResolver bean。

问题是，在Spring Security过滤器之前指定 MultipartFilter 时，它会尝试获取 multipartResolver 豆但无法找到它。因为它希望bean名称/ id为 filterMultipartResolver 而不是 multipartResolver 。

帮自己一个忙。请更改bean配置，如下所示 -

@Bean
public CommonsMultipartResolver filterMultipartResolver(){
    CommonsMultipartResolver resolver = new 
    CommonsMultipartResolver();
    return resolver;
}

或

@Bean(name = "filterMultipartResolver")
public CommonsMultipartResolver multiPartResolver(){
    CommonsMultipartResolver resolver = new 
    CommonsMultipartResolver();
    return resolver;
}

Answer 4

R. Ali Ashik的回答为我工作。

以下是我正在进行的项目的pom.xml的相关部分：

  <properties>
  <springframework.version>5.0.2.RELEASE</springframework.version>
  <springsecurity.version>5.0.0.RELEASE</springsecurity.version>
  <hibernate.version>5.2.17.Final</hibernate.version>
  <mysql.connector.version>8.0.11</mysql.connector.version>

因为我有一个带有持久身份验证设置的自定义登录页面，所以我还需要具备以下条件：

public class SecurityWebApplicationInitializer extends AbstractSecurityWebApplicationInitializer {

        @Override
        protected void beforeSpringSecurityFilterChain(ServletContext servletContext) {
            insertFilters(servletContext, new MultipartFilter());
        }
    }

但正如R. Ali Ashik指出的那样，实际的关键是这个：

@Bean(name = "filterMultipartResolver")
public CommonsMultipartResolver multiPartResolver(){
    CommonsMultipartResolver resolver = new 
    CommonsMultipartResolver();
    return resolver;
}

上下文中的相关参考资料如下： Class MultipartFilter

由于未提供多部件配置，因此无法处理部件

4 个答案: