用于设备数据分组加工。
处理过程详见 indi.tudan.deviceprocess.core.DeviceProcess；测试代码详见 indi.tudan.deviceprocess.DeviceProcessApplicationTests。
本示例提供了两种解决方案，processWithMap() 使用 jdk HashMap；processWithJson() 使用 fastjson；若您用了其他的数据对象类，参照修改即可。
@description jdk 1.8 及以上
@author wangtan
@date 2019-10-26 17:05:46
@since 1.0
思路：先按照设备编号分组，再按照周期分组。请考虑待分组属性为空的情况。
注意：使用 Collectors.groupingBy 的时候， 分组属性千万不能为 null。遇到这种情况，可以做类型转换；或者使用 filter 将 null 过滤掉。
[{
"machineCode": "testdelete001",
"machineName": "设备000011",
"maintainInterval": 0,
"dateList": [1568545050000]
}, {
"machineCode": "testdelete001",
"machineName": "设备000011",
"maintainInterval": 1,
"dateList": [1568545070000]
}, {
"machineCode": "testdelete001",
"machineName": "设备000011",
"maintainInterval": 1,
"dateList": [1568545060000]
}, {
"machineCode": "shebeibangdtest001",
"machineName": "设备绑定测试001",
"maintainInterval": 0,
"dateList": [1568279597000]
}, {
"machineCode": "SDL-001",
"machineName": "离心机001",
"maintainInterval": 0,
"dateList": [1571824443000]
}, {
"machineCode": "HT-001",
"machineName": "选籽机001",
"maintainInterval": 0,
"dateList": [1571824443000, 1571846401000]
}, {
"machineCode": "FZJ-001",
"machineName": "纺织机001",
"maintainInterval": null,
"dateList": [null]
}, {
"machineCode": "2",
"machineName": "阿诗丹顿",
"maintainInterval": 0,
"dateList": [1571397603000, 1571825190000, 1571882705000]
}, {
"machineCode": "3",
"machineName": "阿诗丹顿3",
"maintainInterval": 1,
"dateList": [1571193334000]
}][{
"machineCode": "HT-001",
"intervalGroup": [{
"maintainInterval": 0,
"dateList": [1571824443000, 1571846401000]
}],
"machineName": "选籽机001"
}, {
"machineCode": "2",
"intervalGroup": [{
"maintainInterval": 0,
"dateList": [1571397603000, 1571825190000, 1571882705000]
}],
"machineName": "阿诗丹顿"
}, {
"machineCode": "testdelete001",
"intervalGroup": [{
"maintainInterval": 0,
"dateList": [1568545050000]
}, {
"maintainInterval": 1,
"dateList": [1568545070000, 1568545060000]
}],
"machineName": "设备000011"
}, {
"machineCode": "3",
"intervalGroup": [{
"maintainInterval": 1,
"dateList": [1571193334000]
}],
"machineName": "阿诗丹顿3"
}, {
"machineCode": "shebeibangdtest001",
"intervalGroup": [{
"maintainInterval": 0,
"dateList": [1568279597000]
}],
"machineName": "设备绑定测试001"
}, {
"machineCode": "SDL-001",
"intervalGroup": [{
"maintainInterval": 0,
"dateList": [1571824443000]
}],
"machineName": "离心机001"
}]
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