科大讯飞json解析关键词

/** 
 * 解析 语音听写返回结果Json格式字符串 的模板类（多重嵌套Json） 
 * 
 * 语音识别结果Json数据格式（单条数据）： 
 * {"sn":1,"ls":true,"bg":0,"ed":0,"ws":[ 
 * {"bg":0,"cw":[{"w":"今天","sc":0}]}, 
 * {"bg":0,"cw":[{"w":"的","sc":0}]}, 
 * {"bg":0,"cw":[{"w":"天气","sc":0}]}, 
 * {"bg":0,"cw":[{"w":"怎么样","sc":0}]}, 
 * {"bg":0,"cw":[{"w":"。","sc":0}]} 
 * ]} 
 * 
 * sn  number :第几句 
 * ls   boolean: 是否最后一句 
 * bg  number :开始 
 * ed  number :结束 
 * ws  array :词 
 * cw   array :中文分词 
 * w  string :单字 
 * sc  number :分数 
 */