SpringBoot：使用Apache Commons FileUpload的大型流文件上传

龙涵蓄

2023-03-14

问题内容：

我正在尝试使用“流式” Apache Commons File Upload API上传大文件。

我使用Apache Commons File Uploader而不是默认的Spring Multipart Uploader的原因是，当我们上传非常大的文件大小（〜2GB）时，它失败了。我在GIS应用程序上工作，这种文件上传非常常见。

我的文件上传控制器的完整代码如下：

@Controller
public class FileUploadController {

    @RequestMapping(value="/upload", method=RequestMethod.POST)
    public void upload(HttpServletRequest request) {
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);
        if (!isMultipart) {
            // Inform user about invalid request
            return;
        }

        //String filename = request.getParameter("name");

        // Create a new file upload handler
        ServletFileUpload upload = new ServletFileUpload();

        // Parse the request
        try {
            FileItemIterator iter = upload.getItemIterator(request);
            while (iter.hasNext()) {
                FileItemStream item = iter.next();
                String name = item.getFieldName();
                InputStream stream = item.openStream();
                if (item.isFormField()) {
                    System.out.println("Form field " + name + " with value " + Streams.asString(stream) + " detected.");
                } else {
                    System.out.println("File field " + name + " with file name " + item.getName() + " detected.");
                    // Process the input stream
                    OutputStream out = new FileOutputStream("incoming.gz");
                    IOUtils.copy(stream, out);
                    stream.close();
                    out.close();

                }
            }
        }catch (FileUploadException e){
            e.printStackTrace();
        }catch (IOException e){
            e.printStackTrace();
        }
    }

    @RequestMapping(value = "/uploader", method = RequestMethod.GET)
    public ModelAndView uploaderPage() {
        ModelAndView model = new ModelAndView();
        model.setViewName("uploader");
        return model;
    }

}

麻烦的是，getItemIterator(request)始终返回没有任何项目（即一个迭代器iter.hasNext()）始终返回false。

我的application.properties文件如下：

spring.datasource.driverClassName=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://localhost:19095/authdb
spring.datasource.username=georbis
spring.datasource.password=asdf123

logging.level.org.springframework.web=DEBUG

spring.jpa.hibernate.ddl-auto=update

multipart.maxFileSize: 128000MB
multipart.maxRequestSize: 128000MB

server.port=19091

的JSP视图/uploader如下：

<html>
<body>
<form method="POST" enctype="multipart/form-data" action="/upload">
    File to upload: <input type="file" name="file"><br />
    Name: <input type="text" name="name"><br /> <br />
    Press here to upload the file!<input type="submit" value="Upload">
    <input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}" />
</form>
</body>
</html>

我可能做错了什么？

问题答案：

感谢M.Deinum的一些非常有帮助的评论，我设法解决了这个问题。我已经整理了一些原始帖子，并将其作为完整答案发布，以备将来参考。

我犯的第一个错误是没有禁用MultipartResolverSpring提供的默认值。这最终导致解析器处理HttpServeletRequest并因此在我的控制器对其执行操作之前将其消耗掉。

感谢M. Deinum，禁用它的方法如下：

multipart.enabled=false

但是，此后还有另一个隐患等待着我。禁用默认的多部分解析器后，尝试进行上传时，我开始出现以下错误：

Fri Sep 25 20:23:47 IST 2015
There was an unexpected error (type=Method Not Allowed, status=405).
Request method 'POST' not supported

在我的安全配置中，我启用了CSRF保护。这就需要我以以下方式发送POST请求：

<html>
<body>
<form method="POST" enctype="multipart/form-data" action="/upload?${_csrf.parameterName}=${_csrf.token}">
    <input type="file" name="file"><br>
    <input type="submit" value="Upload">
</form>
</body>
</html>

我还对控制器做了一些修改：

@Controller
public class FileUploadController {
    @RequestMapping(value="/upload", method=RequestMethod.POST)
    public @ResponseBody Response<String> upload(HttpServletRequest request) {
        try {
            boolean isMultipart = ServletFileUpload.isMultipartContent(request);
            if (!isMultipart) {
                // Inform user about invalid request
                Response<String> responseObject = new Response<String>(false, "Not a multipart request.", "");
                return responseObject;
            }

            // Create a new file upload handler
            ServletFileUpload upload = new ServletFileUpload();

            // Parse the request
            FileItemIterator iter = upload.getItemIterator(request);
            while (iter.hasNext()) {
                FileItemStream item = iter.next();
                String name = item.getFieldName();
                InputStream stream = item.openStream();
                if (!item.isFormField()) {
                    String filename = item.getName();
                    // Process the input stream
                    OutputStream out = new FileOutputStream(filename);
                    IOUtils.copy(stream, out);
                    stream.close();
                    out.close();
                }
            }
        } catch (FileUploadException e) {
            return new Response<String>(false, "File upload error", e.toString());
        } catch (IOException e) {
            return new Response<String>(false, "Internal server IO error", e.toString());
        }

        return new Response<String>(true, "Success", "");
    }

    @RequestMapping(value = "/uploader", method = RequestMethod.GET)
    public ModelAndView uploaderPage() {
        ModelAndView model = new ModelAndView();
        model.setViewName("uploader");
        return model;
    }
}

其中Response只是我使用的一种简单的通用响应类型：

public class Response<T> {
    /** Boolean indicating if request succeeded **/
    private boolean status;

    /** Message indicating error if any **/
    private String message;

    /** Additional data that is part of this response **/
    private T data;

    public Response(boolean status, String message, T data) {
        this.status = status;
        this.message = message;
        this.data = data;
    }

    // Setters and getters
    ...
}

SpringBoot：使用Apache Commons FileUpload的大型流文件上传

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