Question

我有嵌套JSON，如 -

"disks" : [ {
        "name" : "v2.16",
        "diskAggregate" : "aggr0",
        "diskRPM" : 15000,
        "totalSizeBytes" : 1077477376,
        "vendorId" : "NETAPP  ",
        "usedBytes" : 1070071808,
        "diskType" : "FCAL",
        "uuid" : "4E455441:50502020:56442D31:3030304D:422D465A:2D353230:32353836:30303030:00000000:00000000",
        "portName" : "FC:A ",
        "raidGroup" : "rg0"
    }, 
    {
        "name" : "v4.16",
        "diskAggregate" : "aggr0",
        "diskRPM" : 15000,
        "totalSizeBytes" : 1077477376,
        "vendorId" : "NETAPP  ",
        "usedBytes" : 1070071808,
        "diskType" : "FCAL",
        "uuid" : "4E455441:50502020:56442D31:3030304D:422D465A:2D353230:32353633:34333030:00000000:00000000",
        "portName" : "FC:B ",
        "raidGroup" : "rg0"
    }]

我希望得到额外的＆＃39; totalSizeBytes＆＃39;从上面的对象列表。

我使用以下代码来获取它 -

val storageDevices = "above given json".toList   
val totalCapacity = storageDevices.foldLeft(0) {
    case (sumOfAllDevices, storageDevice) =>
      val sumOfTotalBytesOnStorageDevice = storageDevice.disks.foldLeft(0) {
        case (totalBytesOnDevice, disk) =>
          totalBytesOnDevice + disk.usedBytes.getOrElse(0).toString.toInt
      }
      sumOfAllDevices + sumOfTotalBytesOnStorageDevice
    // Logger.info("dss"+sumOfTotalBytesOnStorageDevice.toString.toInt)
  }

此代码以整数格式提供总容量。但由于磁盘阵列中的对象太多，totalCapacity将超过int。所以我想在添加时将其转换为Long。

我想要关注输出 -

"totalCapacity": [
  {
    "name": "192.168.20.22",
    "y": 123456789
  }
]

如何将其转换为Long以获得所有＆＃39; totalBytesAvailable＆＃39;的完全总和从数组/列表???

Answer 1

在0L和Int中将零值转换为foldLeft(0L)（默认情况下假定为getOrElse(0L)），因此编译器将在Long上强制执行算术添加}。

如何使用scala和play获得Long格式的嵌套JSON元素的总和？

1 个答案: