推荐您去看看下面的文档: http://wenku.baidu.com/link?url=yoVUv47ipBQtsuFGrpBYzPuozQmFmgUkuax1pwsfVVxxbUygN1pgra_4Ce93db4PbbSmZuC7OMVUkiwJQ2x9U80R7L7kIr0L1O_mbOYkSDa
