JMeter的正则表达式 - 提取JSON效应初探码的精确值

Question

我需要从JSON响应特定的“WarehouseService”型机关中提取的"id":值：

{"id":21,"active":true,"activities":[{"id":229,"activityId":61,"activityName":"Restack","customFieldIds":[8,10],"separateInvoice":false,"unitId":42,"unitName":"Pallet","locationActivityId":0,"incentiveGroupId":null},{"id":228,"activityId":101,"activityName":"Double Roll Off","customFieldIds":[8,9],"separateInvoice":true,"unitId":45,"unitName":"Put","locationActivityId":0,"incentiveGroupId":null},{"id":227,"activityId":129,"activityName":"Container","customFieldIds":[8,5,9],"separateInvoice":false,"unitId":64,"unitName":"Item","locationActivityId":0,"incentiveGroupId":null},{"id":226,"activityId":298,"activityName":"Truck Wash","customFieldIds":[7,6],"separateInvoice":false,"unitId":44,"unitName":"Bottle","locationActivityId":0,"incentiveGroupId":null},{"id":225,"activityId":299,"activityName":"Fueling","customFieldIds":[4,8],"separateInvoice":false,"unitId":190,"unitName":"Percentage","locationActivityId":0,"incentiveGroupId":null}],"comCheckServiceCharge":30.00,"creditCardServiceCharge":1.00,"locationId":15,"name":"SCORS","nameId":53,"selectionRates":[],"serviceRates":[],"type":"WarehouseServices","unloadingRates":[]}, 

我在寻找的值等于“21”在这个字符串中。 问题是响应代码中有很多其他部分包含相同的参数字符串，但部门类型不同。 你们可以帮我写出正确的正则表达式，这样我就可以匹配最终得到“WarehouseService”的确切字符串吗？ 我试过使用lookarounds，但它没有帮助。

Answer 1

我不会推荐使用正则表达式来解析JSON。最近发布的JMeter 3.0附带JSON Path PostProcessor，它是专为使用JSON数据而设计的。相关配置是：

• 变量名：id
• JSON路径表达式：$..[?(@.type == 'WarehouseServices')].id
• 等领域可能会留下，因为他们是

可以使用的JSON路径测试模式View Results Tree侦听器无需重新执行测试即可测试您的JSON路径查询与真实响应。

参考文献：

• JSONPath - XPath for JSON - JSON路径语言的介绍和参考
• Advanced Usage of the JSON Path Extractor in JMeter - 扩展的指南，其中重点介绍了一些更复杂的情况（比如你的一个）