将JSON字符串反序列化为列表列表Java POJO

Question

I get below JSON string as a request body for my REST API. I don't like this JSON structure, but I don't have any control on this. It's somebody else posting this message and I have to create a REST API (POST method) and consume this message in my API. So I have to deserialize this into Java objects in my REST controller. It has list of lists objects. I tried several ways with fasterxml, but I was not successful.

{
  "messages": [
    [
      {
        "message": "message1_a",
        "info": {
          "timestamp": "2521013204"
        }
      },
      {
        "message": "message1_b",
        "info": [
          {
            "message": "message1_c",
            "info": {
              "id": "asfa-14fs-df"
            }
          },
          {
            "message": "message1_d",
            "info": {
              "reason": "msg_reason",
            }
          }
        ]
      }
    ]
  ]
}

Can anybody help me how my Java POJOs should look like?

Answer 1

It seems like a array of message.

In Java you can use Spring to transform the Json to a Object.

   String url = "http://your/json/url";
   ResponseEntity<Message[]> responseEntity = new RestTemplate().getForEntity(url, Message[].class);

Be sure that your entity has all the attributes of Json.

The doc: https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/web/client/RestTemplate.html