List<DayReport> list = JSON.parseArray(dayReport.getDayReportList(), DayReport.class);
List<DayReport> list = JSON.parseArray(Json字符串, DayReport.class);
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.49</version>
</dependency>
