用Java进行文件上传（带进度条）

问题描述

对于Java来说，我是非常新的，大多数时候我只是在自学，所以我开始构建一个小程序。我想创建一个可以从本地磁盘选择一个文件，并将其上传为multipart / form-data POST请求，但是带有进度条。显然，用户必须授予Java applet访问硬盘驱动器的权限。现在我已经得到了第一部分的工作：用户可以使用 JFileChooser 对象来选择一个文件，它可以方便的返回一个 File 对象。但是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），但是如何发送选定的 File 到网络，我如何监视已经发送了多少字节？感谢提前。

解决方案

我最终绊倒了一个开源的Java上传器小程序，发现了我需要知道的一切。这里有链接到一个博客文章，描述它以及来源：

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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.

解决方案

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:

Article
Source Code

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