使用 Java 上传文件(带进度条) [英] File Upload with Java (with progress bar)

问题描述

我对 Java 非常陌生，并且大部分时间都在自学，所以我开始构建小程序.我想做一个可以从本地磁盘中选择一个文件并将其上传为 multipart/form-data POST 请求但带有进度条.显然，用户必须授予 Java 小程序访问硬盘驱动器的权限.现在我已经完成了第一部分的工作:用户可以使用 JFileChooser 对象选择一个文件，该对象方便地返回一个 File 对象.但我想知道接下来会发生什么.我知道 File.length() 会给我文件的总大小(以字节为单位)，但是我如何将选定的 File 发送到网络，我该如何监控发送了多少字节?提前致谢.

I'm extremely new to Java, and have mostly just been teaching myself as I go, so I've started building an applet. I'd like to make one that can select a file from the local disk and upload it as a multipart/form-data POST request but with a progress bar. Obviously the user has to grant permission to the Java applet to access the hard drive. Now I've already got the first part working: the user can select a file using a JFileChooser object, which conveniently returns a File object. But I'm wondering what comes next. I know that File.length() will give me the total size in bytes of the file, but how do I send the selected File to the web, and how do I monitor how many bytes have been sent? Thanks in advance.

推荐答案

我最终偶然发现了一个开源 Java 上传器小程序，并在它的代码中找到了我需要知道的一切.以下是描述它的博客文章以及来源的链接:

I ended up stumbling across an open source Java uploader applet and found everything I needed to know within its code. Here are links to a blog post describing it as well as the source:

文章
源代码

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