Spring MVC文件上载-无法处理部件，因为未提供多部件配置

Question

因此，我是Spring的新手，我正在尝试让文件上传为我的项目工作（顺便说一句，我正在使用Spring工具套件），提交表单时，我得到的只是：

HTTP状态500-无法解析多部分servlet请求；嵌套异常为java。lang.IllegalStateException：无法处理部件，因为未提供多部件配置

从浏览器堆栈跟踪：

type Exception report

message Could not parse multipart servlet request; nested exception is java.lang.IllegalStateException: Unable to process parts as no multi-part configuration has been provided

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.lang.IllegalStateException: Unable to process parts as no multi-part configuration has been provided
    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)
root cause

java.lang.IllegalStateException: Unable to process parts as no multi-part configuration has been provided
    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 The full stack trace of the root cause is available in the Apache Tomcat/8.0.27 logs.

这是jsp中的表单标记：

<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>

照片存储在此字段中的艺术家对象：

@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上下文中的多部分解析器配置。xml：

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

web中的筛选器。xml：

<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>

我还导入了Tomcat的配置文件上下文。xml到META-INF/context。xml和编辑过的上下文标记如下：

<Context allowCasualMultipartParsing="true">

似乎没有什么工作，任何帮助将不胜感激。

Answer 1

对于那些对PUT方法处理程序获得相同异常的人：请改用POST<代码>放置与多部件不兼容。

有关更多详细信息，请参见相应的答案

Answer 2

没有一个答案正确地解决了这个问题。根据Tomcat文档，在配置allowCasualMultipartParsing时：

如果Tomcat在HttpServletRequest时应自动解析多部分/表单数据请求正文，则设置为true。getPart*或HttpServletRequest。即使目标servlet没有标记@MultipartConfig注释，也会调用getParameter*（有关详细信息，请参阅servlet规范3.0，第3.2节）。请注意，除false以外的任何设置都会导致Tomcat的行为在技术上不符合规范。默认值为false。

那么，顺从的方式是什么？阅读官方的JEE 6教程给出了一个提示。如果要对Servlet 3或更新版本使用符合规范的方式，则Servlet必须具有MultipartConfig。根据配置servlet的方式，您有三种选择：

>

使用编程配置：<代码>上下文。addServlet（名称，servlet）。setMultipartConfig（新的MultipartConfigElement（“您的路径”）

通过注释，使用javax对servlet的类进行注释。servlet。注释。MultipartConfig

使用XML配置，将其添加到WEB-INF/WEB。xml描述符，在servlet部分：

<multipart-config>
     <location>/tmp</location>
     <max-file-size>20848820</max-file-size>
     <max-request-size>418018841</max-request-size>
     <file-size-threshold>1048576</file-size-threshold>
</multipart-config>

Answer 3

实际上，您不需要在web上使用任何过滤器。xml，以便使用Spring MVC上载多部分文件。我在我的项目中使用了相同的配置，并且工作正常（${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>

Spring上下文

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

Spring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:/";
        }
    }