JSONArray.toCollection 封装 bean 失败

1. 问题描述：

通过http请求服务端，返回的bean的集合的字符串形式，其中bean中的Date类型的属性值，形式为Long类型的表示形式（1466083519000）；

String responseStr = client.list(userid, from, to, s, max, -1);

返回的 responseStr如下：


[{"id":44,"content":"上海精神","createtime":1466083520000,"provider":"Apollo","receiver":"apollo","readingflag":1},{"id":45,"content":"上海精神","createtime":1466083520000,"provider":"Apollo","receiver":"apollo","readingflag":1},{"id":46,"content":"上海精神","createtime":1466083520000,"provider":"Apollo","receiver":"apollo","readingflag":1},{"id":47,"content":"上海精神","createtime":1466083520000,"provider":"Apollo","receiver":"apollo","readingflag":0},{"id":48,"content":"上海精神","createtime":1466083520000,"provider":"Apollo","receiver":"apollo","readingflag":0},{"id":49,"content":"上海精神","createtime":1466083520000,"provider":"Apollo","receiver":"apollo","readingflag":0},{"id":8,"content":"上海精神","createtime":1466083519000,"provider":"Apollo","receiver":"apollo","readingflag":1},{"id":9,"content":"上海精神","createtime":1466083519000,"provider":"Apollo","receiver":"apollo","readingflag":1},{"id":10,"content":"上海精神","createtime":1466083519000,"provider":"Apollo","receiver":"apollo","readingflag":1},{"id":13,"content":"上海精神","createtime":1466083519000,"provider":"Apollo","receiver":"apollo","readingflag":1}]

此时通过JSONArray来转换，

JSONArray jArray = JSONArray.fromObject(responseStr);

接着通过Collection collection = JSONArray.toCollection(jArray, Message.class);来转出集合，

问题出现了：

集合 bean（Message）中的Date 类型 createtime值为系统当前时间，而非正确的时间数据（1466083519000所对应的 yyyy-MM-dd类型数据）。

2. 处理办法：

对返回的responseStr数据运用正则表达式，替换long形式数据为日期格式形式。

　　　　 String regEx = "[0-9]{13}";
        Pattern pattern = Pattern.compile(regEx);
        Matcher matcher = pattern.matcher(responseStr);
        while(matcher.find()){
            String group = matcher.group();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            String format = sdf.format(new Date(Long.valueOf(group)));
            responseStr = responseStr.replace(group, format);
        }

        JSONArray jArray = JSONArray.fromObject(responseStr);
        List<Map> messageListPage = (List<Map>)JSONArray.toCollection(jArray, Map.class);

再将List<Map> 返回前端让js处理，前端返回类型 dataType : "json”，返回List<Message> 和返回 List<Map> 处理方式一样