JSONArray.toCollection 封装 bean 失败

最新推荐文章于 2024-10-30 13:41:48 发布

转载最新推荐文章于 2024-10-30 13:41:48 发布 · 299 阅读

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原文链接：http://www.cnblogs.com/rocky-fang/p/5718342.html

文章标签：

#前端 #json #ViewUI

本文介绍了一种处理HTTP请求返回的长整型时间戳的方法，通过正则表达式将其转换为日期格式，并讨论了如何避免日期字段显示为当前时间的问题。

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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);