使用DOM解析XML文件

Dom解析是将xml文件全部载入，组装成一颗dom树，然后通过节点以及节点之间的关系来解析xml文件。对于特别大的文档，解析和加载整个文档可能很慢且很耗资源

http://www.iteye.com/topic/763926

-Dom XML file using DOM parser to parse the xml file is all loaded, assembled into a dom tree, then the relationship between nodes and nodes to parse xml files. For particularly large documents, parsing and loading the entire document may be very slow and very resource intensive http://www.iteye.com/topic/763926