Handling HTML (multipart form-data) file uploads with Java

问题

I'm working on a multiple file upload solution for a proof-of-concept web application. I'm using a java servlet to handle an AJAX file upload. My question is how does java handle uploading files from an HTML form? If someone could explain how a basic HTML file upload is processed then I could probably port this to my solution.

Quick tangent: I'm a web developer with a background in C# & PHP. I'm trying to hop on the Java bandwagon now that I've taken a new position where mycompany believes Java is the holy grail of all programming languages. I feel like I'm missing something here... I definitely like the feel of the Java language and how easy it is to run applications. But its seems infinitely difficult to use as a web programming language.

Thanks in advance.

回答1:

You can use Commons FileUpload library:

http://commons.apache.org/fileupload/

Here is simple example of it's usage:

// Create a factory for disk-based file items
FileItemFactory factory = new DiskFileItemFactory();

// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);

// Parse the request
List /* FileItem */ items = upload.parseRequest(request);

I taken this example from here:

http://commons.apache.org/fileupload/using.html

回答2:

I just did it today. I followed this tutorial. It is specific for GWT, but author explained basics brilliantly.

来源：https://stackoverflow.com/questions/4833108/handling-html-multipart-form-data-file-uploads-with-java