如何在Java Servlet中獲取Uploaded文件名？

Question

我有這個：

public void doPost(HttpServletRequest request, 
      HttpServletResponse response) throws IOException, ServletException {
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    try{
        sentfilename = printNames(request);
        MultipartRequest multipartRequest = new MultipartRequest(request, ImageDirecoty, 1024*1024*5);
    } catch(IOException e){
        response.sendError(HttpServletResponse.SC_CONFLICT, "File limit has exceeded or it wasn't an actual image");
        System.out.println(e.getMessage());
        return;
    }
}

public String printNames(HttpServletRequest request) throws IOException, ServletException{
        for(Part part : request.getParts()){
            Collection<String> headers = part.getHeaders("content-disposition");
            if (headers == null)
                continue;
            for(String header : headers){
                String filename = header.substring(header.indexOf("filename=") + 10 , header.length());
                String result = filename.replace("\"", "");
                return result;
            } 
        }
        return null;
}

基本上我是從客戶端上傳一個簡單的文件，現在我需要從請求數據中獲取文件名，可以成功通過printNames函數獲取文件名，並將請求數據寫入我的文件filepath ，現在的問題是，如我所見doPost() try如果我先放置printNames函數，則可以獲取文件名，但它不寫入數據；如果我首先放置MultipartRequest ，則可以獲取文件上傳，但不獲取文件名。

希望不要造成任何困惑，並在此先感謝

Answer 1

您可以從零件對象本身獲取它

String fileName = part.getSubmittedFileName();

例：

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    Deque<FileInfo> files = new LinkedList<>();
    for (Part part : req.getParts()) {
        long fileSize = part.getSize();
        String fileName = part.getSubmittedFileName();
        if (fileSize == 0 && (fileName == null || fileName.isEmpty())) {
            continue; // Ignore part, if not a file.
        }
        FileInfo info = new FileInfo(UUID.randomUUID(), fileSize, fileName, part.getContentType());

        files.add(info);
        Files.copy(part.getInputStream(), new File(uploads, info.getId().toString()).toPath());
    }

    req.getSession().setAttribute("uploadedFiles", files);
    resp.sendRedirect(applicationUrl + "/upload");
}

來源： http ： //ursaj.com/upload-files-in-java-with-servlet-api

希望能幫助到你！