java中如何把后台数据推送到页面上【后续编辑】

https://my.oschina.net/yongqingfan/blog/535749

http://www.blogjava.net/BearRui/archive/2010/05/19/flush_chunk_encoding.html

http://www.cnblogs.com/hoojo/p/longPolling_comet_jquery_iframe_ajax.html