ajax upload 实现文件上传
Ajax Upload; A file upload script with progress-bar, drag-and-drop.
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An older ajax upload plugin, which only used iframe for uploads, and was licensed under MIT license is located on github.This plugin uses XHR for uploading multiple files with progress-bar in FF3.6+, Safari4+, Chrome and falls back to hidden iframe based upload in other browsers, providing good user experience everywhere.DemoTo upload a file, click on the button below. Drag-and-drop is supported in FF, Chrome. Progress-bar is supported in FF3.6+, Chrome6+, Safari4+
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More info please refer: valums.com/ajax-upload/
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这是一个比较好的插件，前端和后端都有实现。前端javascript ajax，后端支持 java 和 php，其他的语言应该也可以支持，但是需要自己实现文件接收。
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1。 server端 接收文件的 servlet：
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?2。web.xml 配置：
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