使用 hashmap List 访问嵌套循环中的对象

问题描述

我有一个 JSON 响应，我想从中解析和提取数据.这是 JSON 响应

[{"od_pair":"7015400:8727100",桶":[{"桶":"C00",原始":2，可用":2},{"桶":"A01",原始":76，可用":0},{"桶":"B01","原文":672,可用":480}]},{"od_pair":"7015400:8814001",桶":[{"桶":"C00",原始":2，可用":2},{"桶":"A01",原始":40，可用":40},{"桶":"B01","原文":672,可用":672},{"桶":"B03","原文":632,可用":632},{"桶":"B05",原始":558，可用":558}]}]

我想提取每个 od_pair 和桶的值，并在其中可用.

@Fenio 在 访问带有嵌套对象的 jsonpath 元素 中的解决方案是最好的方法.我重构的代码片段如下所示:

List>LegList = jsonPath.getList("$");for (HashMap singleLeg : LegList) {String OD_pair = (String) singleLeg.get("od_pair");//List>bucketsList = jsonPath.param("j", j).getList("[j].buckets");List>bucketsList = jsonPath.getList("singleLeg.buckets");for (HashMap singleBucket : bucketsList) {String BucketCode = (String) singleBucket.get("bucket");可用字符串 =(字符串)singleBucket.get("可用");

我想验证我提取的 bucketsList 是否正确.早些时候我使用了一个带有参数 j 的 for 循环.但是使用这种更干净、更好的方法，我想知道我提取bucketsList的方式是否正确

解决方案

我设法解决了这个问题.我明白我哪里出错了.替换

 List>bucketsList = jsonPath.getList("singleLeg.buckets");

有了这个

List>bucketsList = (List) singleLeg.get("buckets");

已解决我的问题，现在一切按预期进行.

因为我已经在 singleLeg 循环中，所以我需要调用的是循环中的 buckets 对象，而不是尝试从 rootpath 访问 buckets.

向@Fenio 大喊大叫，他在访问 jsonpath 中建议了最佳方法带有嵌套对象的元素

I have a JSON response which I want to parse and extract the data from. Here is the JSON response

[
 {
  "od_pair":"7015400:8727100",
  "buckets":[
  {
    "bucket":"C00",
    "original":2,
    "available":2
  },
  {
    "bucket":"A01",
    "original":76,
    "available":0
  },
  {
    "bucket":"B01",
    "original":672,
    "available":480
  }
 ]
 },
 {
 "od_pair":"7015400:8814001",
 "buckets":[
  {
    "bucket":"C00",
    "original":2,
    "available":2
  },
  {
    "bucket":"A01",
    "original":40,
    "available":40
  },
  {
    "bucket":"B01",
    "original":672,
    "available":672
  },
  {
    "bucket":"B03",
    "original":632,
    "available":632
  },
  {
    "bucket":"B05",
    "original":558,
    "available":558
   }
  ]
 }
]

I want to extract each od_pair and the values of of bucket and available within them.

@Fenio's solution in Accessing jsonpath elements with nested objects has the best approaches. The code snippet that I have refactored looks like this:

List<HashMap<String, Object>> LegList = jsonPath.getList("$");

     for (HashMap<String, Object> singleLeg : LegList) {
        String OD_pair = (String) singleLeg.get("od_pair");

    //List<HashMap<String, Object>> bucketsList = jsonPath.param("j", j).getList("[j].buckets");
        List<HashMap<String, Object>> bucketsList = jsonPath.getList("singleLeg.buckets");

        for (HashMap<String, Object> singleBucket : bucketsList) {
            String BucketCode = (String) singleBucket.get("bucket");
            String Available = (String)
singleBucket.get("available");

I want to verify if the bucketsList that I am extracting is correct. Earlier I used a for loop with the parameter j. But with this approach which is lot more cleaner and nicer, I wish to understand if I am right in the way am extracting the bucketsList

解决方案

I managed to resolve this. I understood where I was going wrong. Replacing

 List<HashMap<String, Object>> bucketsList = jsonPath.getList("singleLeg.buckets");

with this

List<HashMap<String, Object>> bucketsList = (List<HashMap<String, Object>>) singleLeg.get("buckets");

Has resolved my issue and now things work as expected.

Since I was already within singleLeg loop, all I needed to call was the buckets object within the loop rather than trying to access the buckets from the rootpath.

Big shoutout to @Fenio who advised the best approaches in Accessing jsonpath elements with nested objects

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