如何使用commons文件上传流式api上传文件 [英] how to upload a file using commons file upload streaming api

问题描述

我正在关注commons文件上传站点中提供的有关流API的示例。我不知道如何弄清楚如何获取上传文件的文件扩展名，如何将文件写入目录，最糟糕的部分是编写示例注释的人 //处理输入流... 它让我想知道它是否是如此微不足道，以至于我是唯一一个不知道如何做的人。

I am following the example provided in the commons file upload site about streaming API. I am stuck trying to figure out how to get the file extension of the uploaded file, how to write the file to a directory and the worst part is where the person who wrote the example comments // Process the input stream... It leaves me wondering if it's something so trivial that I'm the only one who doesn't know how to.

推荐答案

在HTML文件中使用此项：

Use this in your HTML file:

<form action="UploadController" enctype="multipart/form-data" method="post">  
  <input type="file">  
</form>

以及 UploadController servlet，在 doPost 方法：

and in the UploadController servlet, inside the doPost method:

    boolean isMultipart = ServletFileUpload.isMultipartContent(request);

    if (isMultipart) {
        FileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);

    try {
        List items = upload.parseRequest(request);
        Iterator iterator = items.iterator();
        while (iterator.hasNext()) {
            FileItem item = (FileItem) iterator.next();

            if (!item.isFormField()) {
                String fileName = item.getName();

                String root = getServletContext().getRealPath("/");
                File path = new File(root + "/uploads");
                if (!path.exists()) {
                    boolean status = path.mkdirs();
                }

                File uploadedFile = new File(path + "/" + fileName);
                System.out.println(uploadedFile.getAbsolutePath());
                item.write(uploadedFile);
            }
        }
    } catch (FileUploadException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

这篇关于如何使用commons文件上传流式api上传文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！