签名小程序和服务器端控制器之间的通信 [英] Communication between Signed Applet and server side Controller

问题描述

我创建了一个签名的小程序，用于将文件上传到服务器.代码运行良好，但我想将该文件从小程序发送到服务器端控制器，代码已将文件保存到服务器.

I have created a signed applet for uploading a file to server. Code is running fine but I want to send that file from applet to server side controller where the code has placed to save that file to server.

我在签名小程序中的 SendFile 代码:

public static void sendFile(String destFileName) throws IOException {       
        String filePrivacy = "Public";
        String fileKeyword = "uploadFileDocumentName";
        String fileComments = "fileComments";
        String fileType = "txt";
        String fileFolder = "/Works";
        String fileDetails = "";
        HttpClient client = new HttpClient();
        PostMethod postMethod = new PostMethod(
                "http://localhost:8080/fileUpload/encryptFileUpload.works?filePrivacy="+filePrivacy+"&fileKeyword="+fileKeyword+"&fileComments="+fileComments+"&fileType="+fileType+"&fileFolder="+fileFolder+"&fileDetails="+fileDetails);

        File f = new File(destFileName);
        Part[] parts = {new FilePart(f.getName(), f)};
        postMethod.setRequestEntity(new MultipartRequestEntity(parts, postMethod.getParams())); 
        postMethod.setRequestHeader("Content-type", "text/xml; charset=ISO-8859-1");
        client.executeMethod(postMethod);
        postMethod.releaseConnection();
    }

我的 UploadController 的方法看起来像:

@RequestMapping(value = "/encryptFileUpload.works")
    public String uploadEncryptFile(String filePrivacy,
            String fileKeyword,
            String fileComments,
            String fileType,
            String fileFolder,
            HttpServletRequest request, HttpServletResponse response) {
        try {
            Map<String, Object> requestMap = new HashMap<String, Object>();
            requestMap.put(DMSConstants.JCR_FILE_PRIVACY, filePrivacy);
            requestMap.put(DMSConstants.JCR_FILE_KEYWORD, fileKeyword);
            requestMap.put(DMSConstants.JCR_FILE_COMMENTS, fileComments);
            requestMap.put(DMSConstants.JCR_FILE_TYPE, fileType);
            MultipartHttpServletRequest m = (MultipartHttpServletRequest) request;
            MultipartFile file = m.getFile("Filedata");
            Node folderNode = contentPublishService.getFolderNode(fileFolder);
            Node node = contentPublishService.saveFileToRepository(folderNode,
                    file.getInputStream(), file.getOriginalFilename(),
                    requestMap);
        } catch (RepositoryException e) {
            e.printStackTrace();        
        return null;
    }

在行 MultipartHttpServletRequest m = (MultipartHttpServletRequest) request; 我收到如下异常:

at the line MultipartHttpServletRequest m = (MultipartHttpServletRequest) request; I am getting exception like:

java.lang.ClassCastException: org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestWrapper cannot be cast to org.springframework.web.multipart.MultipartHttpServletRequest
    at com.nmmc.works.web.controller.FileUploadController.uploadEncryptFile(FileUploadController.java:177)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)

那么哪里出了问题，我应该在我的代码中做哪些更改.第二件事是我可以从谁那里得到文件?

So where is going wrong and what changes should i do in my code. And second thing is who can i get file at controller?

推荐答案

需要更多细节...

只是一些建议...

Part 对象是什么?

如果您想通过部分"上传文件，我可能建议您只覆盖 MultipartEntity writeTo 方法来上传大文件而不是使用数组，或者可能不是这样?

If you want to upload file by 'parts' I may recommend just to override MultipartEntity writeTo method to upload big file instead of using arrays or maybe it is not the thing?

关于演员...我猜那条线可能会导致问题

Concerning the cast... I may guess that line may cause the problem

MultipartHttpServletRequest m = (MultipartHttpServletRequest) request;

作为一项规则，HttpClient 与 FileUpload 库一起工作.那么为什么不改用它呢?

As a rule HttpClient is working in pare with FileUpload lib. So why not to use it instead?

还有一件事...您将内容 mime 指向 text/xml 但它是 xml，特别是如果它是 bin 文件部分?不应该是某种 application/octet-stream 吗?

And one more thing... you point the content mime as text/xml but is it xml especially if it is a bin file part? Shouldn't it be some kind of application/octet-stream instead ?

无论如何，在您的问题中提供更多详细信息会更有帮助

Anyway, that would be more helpful you to provide more details in your question

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