從GridFS讀取時不顯示非ASCII字符

Question

我使用Apache fileupload API上傳文件（具有不同的內容類型），如下所示：

FileItemFactory factory = getFileItemFactory(request.getContentLength());
ServletFileUpload uploader = new ServletFileUpload(factory);
uploader.setSizeMax(maxSize);
uploader.setProgressListener(listener);

List<FileItem> uploadedItems = uploader.parseRequest(request);

...使用以下方法將文件保存到GridFS：

public String saveFile(InputStream is, String contentType) throws UnknownHostException, MongoException {
    GridFSInputFile in = getFileService().createFile(is);
    in.setContentType(contentType);
    in.save();
    ObjectId key = (ObjectId) in.getId();
    return key.toStringMongod();
}

...如下調用saveFile（）：

saveFile(fileItem.getInputStream(), fileItem.getContentType())

並使用以下方法從GridFS中讀取：

public void writeFileTo(String key, HttpServletResponse resp) throws IOException {
    GridFSDBFile out = getFileService().findOne(new ObjectId(key));
    if (out == null) {
        throw new FileNotFoundException(key);
    }
    resp.setContentType(out.getContentType());
    out.writeTo(resp.getOutputStream());
}

我的servlet代碼下載文件：

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    String uri = req.getRequestURI();

    String[] uriParts = uri.split("/");  // expecting "/content/[key]"

    // third part should be the key
    if (uriParts.length == 3) {
        try {
            resp.setDateHeader("Expires", System.currentTimeMillis() + (CACHE_AGE * 1000L));
            resp.setHeader("Cache-Control", "max-age=" + CACHE_AGE);
            resp.setCharacterEncoding("UTF-8");

            fileStorageService.writeFileTo(uriParts[2], resp);
        }
        catch (FileNotFoundException fnfe) {
            resp.sendError(HttpServletResponse.SC_NOT_FOUND);
        }
        catch (IOException ioe) {
            resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
        }
    }
    else {
        resp.sendError(HttpServletResponse.SC_BAD_REQUEST);
    }
}

然而; 所有非ASCII字符都顯示為“？” 在網頁上使用以下代碼將編碼設置為UTF-8：

<meta http-equiv="content-type" content="text/html; charset=UTF-8">

任何幫助將不勝感激！

Answer 1

抱歉，抽出寶貴的時間！ 這是我的錯 代碼或GridFS沒有錯。 我的測試文件的編碼錯誤。

Answer 2

resp.setContentType("text/html; charset=UTF-8");

原因：僅傳遞內容類型以及二進制InputStream。

public void writeFileTo(String key, HttpServletResponse resp) throws IOException {
    GridFSDBFile out = getFileService().findOne(new ObjectId(key));
    if (out == null) {
        throw new FileNotFoundException(key);
    }
    resp.setContentType(out.getContentType()); // This might be a conflict
    out.writeTo(resp.getOutputStream());

}