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检索关键字List<Map<String, Object>> 分组
检索关键字：jdk 8 list<map<String,Object>> 排序
//根据工号进行分组
List<Map<String, Object>> dataList = ((PageResult<Map<String, Object>>) tuple.e2).getItems();
Map<String, List<Map<String, Object>>> groupByEmpId= dataList.stream().collect(
groupingBy(map -> map.get(“emp_id”).toString()));
List<Map<String, Object>>排序
//排序获取id最大的数据
List<Map<String, Object>> result = new ArrayList<Map<String, Object>>();
for(Map.Entry<String, List<Map<String, Object>>> entry : groupByEmpId.entrySet()){
List<Map<String, Object>> mapValue = entry.getValue();
Collections.sort(mapValue, new Comparator<Map<String, Object>>() {
@Override
public int compare(Map<String, Object> o1, Map<String, Object> o2) {
//此处o2.get(“id”)返回BigInteger类型转Integer需要先转String中转
return Integer.valueOf(o2.get(“id”).toString()) – Integer.valueOf(o1.get(“id”).toString());
}
});
result.add(CollectionUtils.isEmpty(mapValue.get(0)) ? null : mapValue.get(0)) ;
}