在apache官网的commons里面有实现库
Commons FileUpload
The Commons FileUpload package makes it easy to add robust, high-performance, file upload capability to your servlets and web applications.
FileUpload parses HTTP requests which conform to RFC 1867, "Form-based File Upload in HTML". That is, if an HTTP request is submitted using the POST method, and with a content type of "multipart/form-data", then FileUpload can parse that request, and make the results available in a manner easily used by the caller.
Starting with version 1.3, FileUpload handles RFC 2047 encoded header values.
The simplest way to send a multipart/form-data request to a server is via a web form, i.e.
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