如何在Spring MVC中使用multipart / form-data

Question

@POST
@Consumes(MediaType.MULTIPART_FORM_DATA) 
@Path("/uploadFile")
public POSResponse singleSave(@FormDataParam("file") MultipartFile file) {
        Response response = new Response();
        String fileName = null;
        if (!file.isEmpty()) {
            try {
                fileName = file.getOriginalFilename();
                byte[] bytes = file.getBytes();
                BufferedOutputStream buffStream = new BufferedOutputStream(new FileOutputStream(new File("d:\\" + fileName)));
                buffStream.write(bytes);
                buffStream.close();
            } catch (Exception e) {
            }
        } else {

        }
        return response;
}

when i hit this api then i got the error "415: Unsupported Media Type" this means not supported header.I want to load file from ARC to controller.

and my console:

A message body reader for Java class org.springframework.web.multipart.MultipartFile, and Java type interface org.springframework.web.multipart.MultipartFile, and MIME media type multipart/form-data; boundary=----WebKitFormBoundaryP1d7Atv9FO9wU301 was not found. The registered message body readers compatible with the MIME media type are: / -> com.sun.jersey.core.impl.provider.entity.FormProvider com.sun.jersey.core.impl.provider.entity.MimeMultipartProvider com.sun.jersey.core.impl.provider.entity.StringProvider com.sun.jersey.core.impl.provider.entity.ByteArrayProvider com.sun.jersey.core.impl.provider.entity.FileProvider com.sun.jersey.core.impl.provider.entity.InputStreamProvider com.sun.jersey.core.impl.provider.entity.DataSourceProvider

i have add some maven dependency in pom.xml file.

My pom file:

<!-- multipart file dependency -->

    <dependency>
        <groupId>org.jvnet</groupId>
        <artifactId>mimepull</artifactId>
        <version>1.6</version>
    </dependency>

    <dependency>
        <groupId>org.jvnet.mimepull</groupId>
        <artifactId>mimepull</artifactId>
        <version>1.9.5</version>
    </dependency>

    <dependency>
        <groupId>com.sun.jersey</groupId>
        <artifactId>jersey-client</artifactId>
        <version>1.17.1</version>
    </dependency>
    <dependency>
        <groupId>com.sun.jersey.contribs</groupId>
        <artifactId>jersey-multipart</artifactId>
        <version>1.17.1</version>
    </dependency>

Answer 1

I am not sure about the code which you have written but this how i did it in spring-mvc

Use case: uploading Images

1. Add a bean definition in our web application's context configuration file (DispatcherServlet-context.xml) for CommonsMultipartResolver,
   as follows:

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="10240000"/> 

2. Add dependency to pom.xml enter Group Id as commons-fileupload, Artifact Id as commons-fileupload, Version as 1.2.2; select Scope as compile; and click on the OK button.

3. Similarly, add one more Group Id dependency as org.apache.commons, Artifact Id as commons-io, Version as 1.3.2; select Scope as compile; click on the OK button; and save the pom.xml file

4. Add a reference to
   org.springframework.web.multipart.MultipartFile with the corresponding setters and getters in the java class the defines the file as a property as follows:

    @JsonIgnore private MultipartFile productImage; @XmlTransient public MultipartFile getProductImage() { return productImage; } public void setProductImage(MultipartFile productImage) { this.productImage = productImage; } 

5. In the jsp where the file is to be uploaded use the following tag

6. Set the enctype attribute to multipart/form-data in the form tag as follows in the jsp

Note: I am using spring form tag libraries

<form:form  modelAttribute="newProduct" class="form-horizontal" enctype="multipart/form-data">

7. Add the following code to the controller

     public String processAddNewProductForm(@ModelAttribute("newProduct") @Valid Product productToBeAdded, BindingResult result, HttpServletRequest request) { if(result.hasErrors()) { return "addProduct"; } MultipartFile productImage = productToBeAdded.getProductImage(); String rootDirectory = request.getSession().getServletContext().getRealPath("/"); if (productImage!=null && !productImage.isEmpty()) { try { productImage.transferTo(new File(rootDirectory+"resources\\\\images\\\\"+productToBeAdded.getProductId() + ".png")); } catch (Exception e) { throw new RuntimeException("Product Image saving failed", e); } } productService.addProduct(productToBeAdded); return "redirect:/products"; } 

****Prerequisites****

spring project has been setup correctly, wiring is done

few annotations and lines of code are specific to my project and may not be totally relevant