Come Config "CommonsMultipartResolver" in Spring4 senza xml caricare il file

Question

Io uso xml config Spring4 è lavoro well.like questo:

<bean id="multipartResolver" 
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver" 
    p:defaultEncoding="utf-8" > 
    <!-- one of the properties available; the maximum file size in bytes --> 
    <!-- <property name="maxUploadSize" value="40000000" /> --> 
</bean> 

quando ho config Spring4 senza xml.like questo:

@Configuration 
@ComponentScan({ "common.user", "service" }) 
@EnableWebMvc 
public class SpringMVCConfig { 

@Bean 
public ViewResolver createInternalResourceViewResolver() { 
    InternalResourceViewResolver viewResolver = new InternalResourceViewResolver(); 
    viewResolver.setViewClass(JstlView.class); 
    viewResolver.setContentType("text/html"); 
    viewResolver.setPrefix("/view/"); 
    //viewResolver.setSuffix(".jsp"); 
    return viewResolver; 
} 

@Bean 
public DefaultServletHttpRequestHandler createDefaultServletHttpRequestHandler() { 
    return new DefaultServletHttpRequestHandler(); 
} 


@Bean 
public CommonsMultipartResolver createMultipartResolver() { 
    CommonsMultipartResolver resolver=new CommonsMultipartResolver(); 
    resolver.setDefaultEncoding("utf-8"); 
    return resolver; 
} 

}

viene generata un'eccezione:

九月 30, 2014 6:01:08 下午 org.apache.catalina.core.StandardWrapperValve invoke 
严重: Servlet.service() for servlet [dispatcher] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: Current request is not of type [org.springframework.web.multipart.MultipartHttpServletRequest]: org.apache.catalina.connector.RequestFacade@5ebfad8d] with root cause 
java.lang.IllegalStateException: Current request is not of type [org.springframework.web.multipart.MultipartHttpServletRequest]: org.apache.catalina.connector.RequestFacade@5ebfad8d 
    at org.springframework.web.servlet.mvc.method.annotation.ServletRequestMethodArgumentResolver.resolveArgument(ServletRequestMethodArgumentResolver.java:97) 
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:79) 
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:157) 
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:124) 
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:781) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:721) 
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961) 
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:646) 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at common.servlet.RootFilter.doFilter(RootFilter.java:71) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    at java.lang.Thread.run(Unknown Source) 

Answer 1

Da MultipartResolver Javadoc: Per definire un'implementazione, creare un bean con id "multipartResolver" nel contesto dell'applicazione DispatcherServlet.

Nella configurazione xml, il bean ha l'ID corretto di multipartResolver, ma non nella configurazione java corrente. Si dovrebbe scrivere:

@Bean 
public CommonsMultipartResolver multipartResolver() { 
    CommonsMultipartResolver resolver=new CommonsMultipartResolver(); 
    resolver.setDefaultEncoding("utf-8"); 
    return resolver; 
} 

o

@Bean(name = "multipartResolver") 
public CommonsMultipartResolver createMultipartResolver() { 
    CommonsMultipartResolver resolver=new CommonsMultipartResolver(); 
    resolver.setDefaultEncoding("utf-8"); 
    return resolver; 
}