Spring + ExtJS 文件上传所需的 MultipartFile 参数“文件”不存在

Question

我在使用带有 RepositoryRestMVC 功能的 Spring 4.0.5 的 ExtJS 上传文件时遇到问题。

简单地说，我有一个由 ExtJS 创建的表单，并将 POST 请求提交给 Spring MVC 后端。

我使用 java config 设置了 Spring，没有 xml 文件。

这是我在 Spring 中的 ApplicationInitializer.class：

public class ApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

private int maxUploadSizeInMb = 5 * 1024 * 1024; // 5 MB

@Override
protected Class<?>[] getRootConfigClasses() {
    return new Class<?>[]{RootConfig.class};
}

@Override
protected Class<?>[] getServletConfigClasses() {
    return new Class<?>[]{};
}

@Override
protected String[] getServletMappings() {
    return new String[]{"/"};
}

@Override
protected Filter[] getServletFilters() {
    return new Filter[]{new HiddenHttpMethodFilter(), new MultipartFilter()};
}

@Override
protected void customizeRegistration(ServletRegistration.Dynamic registration) {        
    File uploadDirectory = RootConfig.APP_STORAGE_UPLOADS_DIRECTORY;

    MultipartConfigElement multipartConfigElement = new MultipartConfigElement(
            uploadDirectory.getAbsolutePath(), maxUploadSizeInMb,
            maxUploadSizeInMb * 2, maxUploadSizeInMb / 2);
    registration.setMultipartConfig(multipartConfigElement);
}

}

这是我的 WebMvcConfig.class：

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.app.controller")
public class WebMvcConfig extends WebMvcConfigurerAdapter { 

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/resources/**").addResourceLocations("/resources/").setCachePeriod(31556926);
        registry.addResourceHandler("/js/**").addResourceLocations("/js/");
     }

    @Bean
    public InternalResourceViewResolver getInternalResourceViewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/");
        resolver.setSuffix(".html");
        return resolver;
    }

    @Bean
    public CommonsMultipartResolver multipartResolver() {       
        System.out.println("===========>>> DispatcherCOntext multipartResolver Called:");
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
        multipartResolver.setMaxUploadSize(7000000);
        return multipartResolver;
    }

}

这是FileUploadController.class：

@Controller
public class FileUploadController {

    private final Logger LOG = LoggerFactory.getLogger(getClass());

    @RequestMapping(value="/user/{id}/photo", method=RequestMethod.POST)
    public @ResponseBody List<UploadedFile> upload(
        @RequestParam("file") MultipartFile file) {
        // Do custom steps here
       // i.e. Save the file to a temporary location or database
        LOG.debug("Writing file to disk...done");

        List<UploadedFile> uploadedFiles = new ArrayList<UploadedFile>();
        UploadedFile u = new UploadedFile(file.getOriginalFilename(),
            Long.valueOf(file.getSize()).intValue(),
            "http://localhost:8080/AppPhoto/resources/"+file.getOriginalFilename());

        uploadedFiles.add(u);
        return uploadedFiles;
    }
}

UploadedFile.class看起来像这样：

public class UploadedFile implements Serializable {

    private static final long serialVersionUID = -38331060124340967L;
    private String name;
    private Integer size;
    private String url;
    private String thumbnail_url;
    private String delete_url;
    private String delete_type;

    public UploadedFile() {
        super();
    }

    public UploadedFile(String name, Integer size, String url) {
        super();
        this.name = name;
        this.size = size;
        this.url = url;
    }

    public UploadedFile(String name, Integer size, String url,
        String thumbnail_url, String delete_url, String delete_type) {
        super();
        this.name = name;
        this.size = size;
        this.url = url;
        this.thumbnail_url = thumbnail_url;
        this.delete_url = delete_url;
        this.delete_type = delete_type;
    }

    //getter and setters

    @Override
    public String toString() {
        return "UploadedFile [name=" + name + ", size=" + size + ", url=" + url
            + ", thumbnail_url=" + thumbnail_url + ", delete_url="
            + delete_url + ", delete_type=" + delete_type + "]";
    }

}

我们先看一下ExtJS 上传表单如下：

Ext.define('FHR.view.MyForm11', {
extend: 'Ext.form.Panel',
requires: [
    'Ext.form.field.File',
    'Ext.toolbar.Toolbar',
    'Ext.button.Button'
],
title: 'My Form',
url:'user/1/photo',
initComponent: function() {
    var me = this;
    Ext.applyIf(me, {
        items: [
            {
                xtype: 'filefield',
                anchor: '100%',
                fieldLabel: 'Profile Photo',
                name: 'file',
                allowBlank: false
            }
        ],
        dockedItems: [
            {
                xtype: 'toolbar',
                dock: 'bottom',
                items: [
                    {
                        xtype: 'button',
                        handler: function(button, e) {   
                            var form = button.up('form').getForm();
                            if (form.isValid()) {
                                form.submit({
                                    success: function(form, action) {
                                        // show message alert box
                                    },
                                    failure: function(form, action) {
                                        // show message alert box
                                    }
                                });
                            } else { // display error alert if the data is invalid
                               // show message alert box
                            }
                        },
                        text: 'Upload'
                    }
                ]
            }
        ]
    });

问题来了

在提交 POST 请求时，我收到 400 Bad request Response

所需的 MultipartFile 参数“文件”不存在

我们将不胜感激任何形式的帮助。

愿原力与你同在

Answer 1

我摆脱了 ApplicationInitializer 类中的上传配置，而是创建了一个上传 xml 配置....尽管只想使用 Java 配置，但它显然有效。在下面找到上传配置 xml

<?xml  version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"
    http://www.springframework.org/schema/context" http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxUploadSize" value="7000000" />
</bean>