如何根据条件从 JSON 路径提取器中提取值

Question

我想根据条件 "status":"Ready for Review" 从 HTTP 采样器的以下 JSON 响应正文中获取 "currentApproversStr:" 的值，并将其传递给以下 HTTP 采样器。

我尝试了以下方法，但它不起作用

1. 已创建变量的名称：currentApproversStr
2. JSON 路径表达式：$.[?((@.currentApproversStr == "Validation, Civa" || @.currentApproversStr == "Validation, Darla" || @.currentApproversStr == "Validation, Bittl" || @ .currentApproversStr == "Validation, Cha" || @.currentApproversStr == "Validation, Barnett" ) && @.status== "Ready for Review")]
3. 匹配编号：-1 OR 1

但 Dummy Sampler 会返回结果

我们无法保证具有“状态”的“timecardId”块的顺序：“Ready for Review”，即有时排在第二位，有时排在最后。这是第二个街区。所以不确定匹配号：我应该给什么

[
  {
    "timecardId": 170803,
    "entryHeaderId": "db9341a9-32e8-4d45-a858-a88b75a42cef",
    "startsOn": "2021-10-24T00:00:00",
    "endsOn": "2021-10-30T00:00:00",
    "worksightStatus": "SignedOff",
    "projectId": 1977,
    "userId": 60874,
    "status": "Submitted for Approval",
    "batchId": 39814,
    "emergencyType": "",
    "htgDealMemoId": "0d0ff42b-5c4b-4695-b527-34dfc64585e5",
    "unionId": "1c77c660-28fc-4e40-b557-132f3da39597",
    "currentApproversStr": "Perf, PA",
    "commentStr": "",
    "commentUserName": "",
    "commentCreatedAt": "1900-01-01T00:00:00",
    "occupationCode": "TECHNICIAN",
    "activeApprovalFlowId": 166669,
    "isAllowanceOnly": false,
    "departmentId": null,
    "datePosted": null
  },
  {
    "timecardId": 170807,
    "entryHeaderId": "c9809446-b01f-4f42-add6-9b441c3d0114",
    "startsOn": "2021-10-17T00:00:00",
    "endsOn": "2021-10-23T00:00:00",
    "worksightStatus": "Outstanding",
    "projectId": 1977,
    "userId": 60874,
    "status": "Ready for Review",
    "batchId": 39815,
    "emergencyType": "",
    "htgDealMemoId": "0d0ff42b-5c4b-4695-b527-34dfc64585e5",
    "unionId": "1c77c660-28fc-4e40-b557-132f3da39597",
    "currentApproversStr": "Validation, Civa",
    "commentStr": "",
    "commentUserName": "",
    "commentCreatedAt": "1900-01-01T00:00:00",
    "occupationCode": "TECHNICIAN",
    "activeApprovalFlowId": 166674,
    "isAllowanceOnly": false,
    "departmentId": null,
    "datePosted": null
  },
  {
    "timecardId": 170802,
    "entryHeaderId": "db9341a9-32e8-4d45-a858-a88b75a42cef",
    "startsOn": "2021-10-24T00:00:00",
    "endsOn": "2021-10-30T00:00:00",
    "worksightStatus": "SignedOff",
    "projectId": 1977,
    "userId": 60874,
    "status": "Submitted for Approval",
    "batchId": 39814,
    "emergencyType": "",
    "htgDealMemoId": "0d0ff42b-5c4b-4695-b527-34dfc64585e5",
    "unionId": "1c77c660-28fc-4e40-b557-132f3da39597",
    "currentApproversStr": "Perf, PA",
    "commentStr": "",
    "commentUserName": "",
    "commentCreatedAt": "1900-01-01T00:00:00",
    "occupationCode": "TECHNICIAN",
    "activeApprovalFlowId": 166669,
    "isAllowanceOnly": false,
    "departmentId": null,
    "datePosted": null
  }
]

Answer 1

问题： 原因是您误解了 JSON 提取器的工作方式。此功能允许您在一个设置中提取多个变量，但 Names of created variables 的数量 = JSON Path expressions 的数量 = Default Values 的数量。

例如，您要提取 2 个变量：

• 创建变量的名称：var_name_1； var_name_2

• JSON 路径表达式：json_expression_1； json_expression_2

• 默认值：default_1； default_2

（注意：记住使用分号（;）分隔值）

但是你设置了 1 变量，1 json 表达式与 MANY 默认值 --> 不匹配。

解决方案： 你可以这样设置：

Names of created variables: currentApproversStr
JSON Path expressions: $.[?(@.status== "Ready for Review")].currentApproversStr
Match No: -1
Default Values: NOT_FOUND

结果：

currentApproversStr_1=Validation, Civa
currentApproversStr_matchNr=1

Answer 2

“匹配号”的作用如下：如果您的查询返回超过 1 个结果：

1. 0 - 返回随机结果

2. -1 - 以以下形式返回所有结果：

   • currentApproversStr_1 - 第一场比赛
   • currentApproversStr_2 - 第二场比赛
   • 等
   • currentApproversStr_matchNr - 匹配总数

3. any positive integer - 返回给定的匹配项

它不仅适用于JSON Extractor，还适用于从响应中提取值的所有其他JMeter PostProcessors。

你可以看到使用Debug Sampler and View Results Tree listener combination生成的JMeter Variables：