Multipart / form-data不支持request.getparamerter [英] Multipart/form-data does not support for request.getparamerter

问题描述

我有一张表格。它有文件上传部分以及几个输入字段。我使用 request.getParameter（）从jsp获取值到servlet。
但是当我添加 encrypt = multipart 时，request.get参数不起作用。它返回null。我知道multipart不支持 request.getParameter（）。是否有任何上传文件的解决方案。我也想使用request.get参数。

I have a form. it has file uploading part as well as several input Fields. i am using request.getParameter() to get values from the jsp into the servlet. But when i add encrypt=multipart, request.get parameter doesn't work. it returns null. i know multipart does not support for the request.getParameter(). Is there any solution for upload files. I want to use request.get parameter also.

推荐答案

apache commons库对这样的要求很有用。

apache commons library will be useful for such requirement.

参考： http ：//javakart.blogspot.in/2012/11/file-upload-example-using-servlet.html
http://www.tutorialspoint.com/servlets/servlets-file-uploading.htm

boolean isMultipart = ServletFileUpload.isMultipartContent(request); 
//this will help you identify request is of type multipart or not.

一旦检查，解析请求并使用库获取表单字段和文件项。

once you check, parse the request and get the form fields and File Item using library.

示例：

List<FileItem> items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request);
        for (FileItem item : items) {
            if (item.isFormField()) {
                // Process regular form field (input type="text|radio|checkbox|etc", select, etc).
                String fieldname = item.getFieldName();
                String fieldvalue = item.getString();
                // ... (do your job here)
            } else {
                // Process form file field (input type="file").
                String fieldname = item.getFieldName();
                String filename = FilenameUtils.getName(item.getName());
                InputStream filecontent = item.getInputStream();
                // ... (do your job here)
            }
        }

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