Spring MVC 文件上传 - 由于未提供多部分配置而无法处理部分

Question

所以我是 Spring 的新手，我正在尝试为我的项目上传文件（顺便说一句，我正在使用 Spring Tool Suite。）并且在提交表单时，我得到的是：

HTTP 状态 500 - 无法解析多部分 servlet 请求；嵌套异常是 java.lang.IllegalStateException：无法处理部件，因为没有提供多部件配置

来自浏览器的堆栈跟踪：

类型异常报告

消息无法解析多部分 servlet 请求；嵌套异常是 java.lang.IllegalStateException：无法处理部件，因为没有提供多部件配置

说明 服务器遇到内部错误，无法完成此请求。

例外

org.springframework.web.multipart.MultipartException：无法解析多部分 servlet 请求；嵌套异常是 java.lang.IllegalStateException：无法处理部件，因为没有提供多部件配置
    org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.parseRequest(StandardMultipartHttpServletRequest.java:100)
    org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.(StandardMultipartHttpServletRequest.java:78)
    org.springframework.web.multipart.support.StandardServletMultipartResolver.resolveMultipart(StandardServletMultipartResolver.java:75)
    org.springframework.web.multipart.support.MultipartFilter.doFilterInternal(MultipartFilter.java:108)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
根本原因

java.lang.IllegalStateException：无法处理部件，因为没有提供多部件配置
    org.apache.catalina.connector.Request.parseParts(Request.java:2676)
    org.apache.catalina.connector.Request.getParts(Request.java:2643)
    org.apache.catalina.connector.RequestFacade.getParts(RequestFacade.java:1083)
    org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.parseRequest(StandardMultipartHttpServletRequest.java:85)
    org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.(StandardMultipartHttpServletRequest.java:78)
    org.springframework.web.multipart.support.StandardServletMultipartResolver.resolveMultipart(StandardServletMultipartResolver.java:75)
    org.springframework.web.multipart.support.MultipartFilter.doFilterInternal(MultipartFilter.java:108)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)

note Apache Tomcat/8.0.27 日志中提供了根本原因的完整堆栈跟踪。

这是jsp中的表单标签：

 <form:form class="form-horizontal" role="form" method="post"
            action="newArtist.html" modelAttribute="artist" enctype="multipart/form-data">

输入部分：

 <div class="form-group">
    <div class="col-lg-3">
        <label for="photo">Artist photo:</label>
        <form:input type="file" id="photo" path="photo"></form:input>
    </div>
</div>

照片存储在艺术家对象的这个字段中：

 @Lob
private byte[] photo;

控制器映射方法：

 @RequestMapping(value = "/newArtist", method = RequestMethod.GET)
public String showAddArtistForm(Model model)
{
    model.addAttribute("artist", new Artist());
    return "newArtist";
}

@RequestMapping(value = "/newArtist", method = RequestMethod.POST)
public String addArtist(@ModelAttribute("artist") @Valid Artist artist, BindingResult result,
        @RequestParam("photo") MultipartFile photo) throws IOException
{
    if (result.hasErrors())
        return "newArtist";

    if(photo.getBytes() != null)
        artist.setPhoto(photo.getBytes());

    artistService.addArtist(artist);

    return "redirect:artists.html";
}

servlet-context.xml 中的多部分解析器配置：

 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxUploadSize" value="10000000"/>
</bean>

web.xml 中的过滤器：

 <filter>
    <filter-name>MultipartFilter</filter-name>
    <filter-class>org.springframework.web.multipart.support.MultipartFilter</filter-class>
</filter>
<filter>
    <filter-name>springSecurityFilterChain</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
    <filter-name>MultipartFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
    <filter-name>springSecurityFilterChain</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

依赖项：

 <!-- Apache Commons FileUpload -->
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.1</version>
    </dependency>

    <!-- Apache Commons IO -->
    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.4</version>
    </dependency>

我还将 Tomcat 的配置文件 context.xml 导入到 META-INF/context.xml 并像这样编辑 Context 标签：

 <Context allowCasualMultipartParsing="true">

似乎没有任何效果，我们将不胜感激任何帮助。

原文由 kbijoch 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

实际上，您不需要 web.xml 上的任何过滤器来使用 Spring MVC 上传您的多部分文件。我在我的项目中有相同的配置并且它有效（${spring.version} = 4.3.4.RELEASE）：

聚甲醛

     <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <!-- Apache Commons FileUpload -->
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.2</version>
    </dependency>

    <!-- Apache Commons IO -->
    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.5</version>
    </dependency>

HTML

     <form method="POST" enctype="multipart/form-data" action="uploadAction">
        <table>
            <tr><td>File to upload:</td><td><input type="file" name="file" /></td></tr>
            <tr><td></td><td><input type="submit" value="Upload" /></td></tr>
        </table>
    </form>

弹簧上下文

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxUploadSize" value="10000000"/>
</bean>

弹簧控制器

@PostMapping("/uploadAction")
    public String handleFileUpload(@RequestParam("file") MultipartFile file,
            RedirectAttributes redirectAttributes) {

        File out = new File("outputfile.pdf");
        FileOutputStream fos = null;

        try {
            fos = new FileOutputStream(out);

            // Writes bytes from the specified byte array to this file output stream
            fos.write(file.getBytes());
            System.out.println("Upload and writing output file ok");
        } catch (FileNotFoundException e) {
            System.out.println("File not found" + e);
        } catch (IOException ioe) {
            System.out.println("Exception while writing file " + ioe);
        } finally {
            // close the streams using close method
            try {
                if (fos != null) {
                    fos.close();
                }
            } catch (IOException ioe) {
                System.out.println("Error while closing stream: " + ioe);
            }

            //storageService.store(file);
            redirectAttributes.addFlashAttribute("message",
                    "You successfully uploaded " + file.getOriginalFilename() + "!");

            return "redirect:/";
        }
    }

原文由 luis-br 发布，翻译遵循 CC BY-SA 3.0 许可协议