java业务常用排序方法

private List<Map<String, Object>> parseData(List<Map<String, Object>> source,Map<String,Object> params) {
List<Map<String, Object>> rt = new ArrayList<Map<String, Object>>();
if (source == null || source.size() == 0) {
return rt;
}
// 日期分组
SortedMap<String, List<Map<String, Object>>> dataMap = new TreeMap<String, List<Map<String, Object>>>();
List<Map<String, Object>> temp = null;
for (Map<String, Object> data : source) {


SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

String createDate = sdf.format(data.get("beginTime"));
if (dataMap.get(createDate) != null) {
dataMap.get(createDate).add(data);
} else {
temp = new ArrayList<Map<String, Object>>();
temp.add(data);
dataMap.put(createDate, temp);
}
}
// 转换格式
SortedMap<String, Object> rtMap = null;

for (Map.Entry<String, List<Map<String, Object>>> entry : dataMap.entrySet()) {
rtMap = new TreeMap<String, Object>();
rtMap.put("createTime", entry.getKey());
params.put("dateTime", entry.getKey());//"%Y-%m-%d"
String allTotal = bookingManageMapper.getDayTotal(params);
rtMap.put("allTotal", allTotal);
rtMap.put("bookingManageList", entry.getValue());
rt.add(rtMap);
}
return rt;
}