从m流中的JSON响应中提取值

Question

I have a json response like this -- I want to extract the value of p_ProviderID. Please guide me how to do it in a mule flow?

 { "category" : "Address", "status": "SUCCESS", "result": { "p_ProviderID": 4, "p_NewProvInd": "Exist" } } 

Answer 1

Use <json:json-to-object-transformer returnClass="java.util.HashMap" doc:name="JSON to Object" /> and then you can get the value using MEL #[message.payload.result.p_ProviderID]

For example, you can get the value of p_ProviderID in logger after using <json:json-to-object-transformer/> as follow:-

<json:json-to-object-transformer returnClass="java.util.HashMap" doc:name="JSON to Object" />
<logger message="#[message.payload.result.p_ProviderID]" level="INFO" doc:name="Logger"/>

Answer 2

For a Json as simple as this, you are better off with JsonPath. A simple expression like this #[json:result/p_ProviderID] would give you what you wanted.

PS: Mule's support for JsonPath as of 3.5 is quite limited and is not as flexible as Xpath.

Answer 3

We need to use Json to Object converter and set return class type to java.util.Map or Java.util.List - in your case this is Map. If you have multiple element of same type in Json you need to use java.util.List