Convert a Json Array to Map in java

Question

I am working on a project where I get a JSON response from my API using entities and DTO

Folowing is the response:

return XXXResponseDTO
                .builder()
                .codeTypeList(commonCodeDetailList)
                .build();

commonCodeDetailList list contains the data from the database. Final output will be

{
  "code_type_list": [
    {
      "code_type": "RECEIVING_LIST",
      "code_list": [
        {
          "code": "1",
          "code_name": "NAME"
        },
        {
          "code": "2",
          "code_name": "NAME1"
        }
      ],
      "display_pattern_list": [
        {
          "display_pattern_name": "0",
          "display_code_list": [
            "1",
            "2"
          ]
        }
      ]
    },
    {
      "code_type": "RECEIVING_LIST1",
      "code_list": [
        {
          "code": "1",
          "code_name": "NAME"
        }
      ],
      "display_pattern_list": [
        {
          "display_pattern_name": "0",
          "display_code_list": [
            "1"
          ]
        }
      ]
    }
  ]
}

I need to convert this to Map with key-value pairs. How could I achieve this?

Use any of the millions of libraries that exist online? GSON, JSON by Alibaba to name a few... — OcelotcR
– OcelotcR, Commented May 15, 2019 at 10:28
Possible duplicate of Array of JSON Object to Java POJO. Take a look on Jackson and gson libraries. — Michał Ziober
– Michał Ziober, Commented May 15, 2019 at 15:07

Izruo · Accepted Answer · 2019-05-15 15:01:09Z

1

Using Jackson, you can do the following:

ObjectMapper mapper = new ObjectMapper();
String jsonStr = mapper.writeValueAsString(commonCodeDetailList);
Map<String, String> map = mapper.readValue(jsonStr, Map.class);

First you need to convert commonCodeDetailList into a json string. After that you can convert this json string to map.

edited May 15, 2019 at 15:01

Izruo

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answered May 15, 2019 at 10:33

Tayyab Razaq

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5 Comments

Izruo Over a year ago

What is ObjectMapper? Or in other words: What library are you using?

Vringar Over a year ago

ObjectMapper is part of the Jackson Project

Izruo Over a year ago

@Vringar I know and I'm asking, because this should be part of the answer.

Vringar Over a year ago

In this case I am confused why you didn't just go ahead and edit the answer.

Izruo Over a year ago

@Vringar Because I don't have enough reputation to bypass peer review, which quite too often stops me from queuing edits. I did edit now, though.

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