Converting a string to a JSON array with Jackson in RESTful APIs

As I delve into the world of JSON and REST, I find myself testing a REST API that returns strings in the following format:

[{
    "Supervisor_UniqueName": "adavis",
    "Active": "true",
    "DefaultCurrency_UniqueName": "USD",
    "arches_type": "x-zensar/primary",
    "Groups": "",
    "TimeZoneID": "US/Pacific-New",
    "UniqueName": "!!pl-10958-611879240",
    "EmailAddress": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="4d6c6c3d21607c7d747875607b7c7c757a747f797d0d29283b202c2421633728233e2c3f632e2220">[email protected]</a>",
    "LocaleID_UniqueName": "en_US",
    "Name": "!!pl-10958-611879240"
}, {
    "Supervisor_UniqueName": "adavis",
    "Active": "true",
    "DefaultCurrency_UniqueName": "USD",
    "arches_type": "x-zensar/primary",
    "Groups": "",
    "TimeZoneID": "US/Pacific-New",
    "UniqueName": "!!pl-10958-789764779",
    "EmailAddress": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="fddcdc8d91d0cccdc4c8c5d0cac5c4cacbc9cacac4bd99988b909c9491d38798938e9c8fd39e9290">[email protected]</a>",
    "LocaleID_UniqueName": "en_US",
    "Name": "!!pl-10958-789764779"
}, {
    "Supervisor_UniqueName": "adavis",
    "Active": "true",
    "DefaultCurrency_UniqueName": "USD",
    "arches_type": "x-zensar/primary",
    "Groups": "Report User",
    "TimeZoneID": "US/Pacific-New",
    "UniqueName": "105838945",
    "EmailAddress": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="eadbdadfd2d9d2d3dedfaa8e8f9c878b8386c4908f84998b98c4898587">[email protected]</a>",
    "LocaleID_UniqueName": "en_US",
    "Name": "105838945"
}, {
    "Supervisor_UniqueName": "adavis",
    "Active": "true",
    "DefaultCurrency_UniqueName": "USD",
    "arches_type": "x-zensar/primary",
    "Groups": "Report User, Report Manager, Report Administrator",
    "TimeZoneID": "US/Pacific-New",
    "UniqueName": "112352755",
    "EmailAddress": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="72434340414740454747321617041f131b1e5c08171c0113005c111d1f">[email protected]</a>",
    "LocaleID_UniqueName": "en_US",
    "Name": "112352755"
}]

I make a call to the REST API like this:

final ResponseEntity<String> responseEntity = restTemplate.getForEntity(resourceUrl , String.class);

where restTemplate is an instance of type RestTemplate

My goal is to convert these strings into a JSON array, iterate through each JSON object, and retrieve the field and values for each one.

Can jackson help achieve this functionality?

javascriptjavajsonrest

Answer №1

If you're looking to parse JSON data, consider using the library called Jackson.

Here is a snippet of the JSON structure:

[  
   {  
      "ManagerName":"jdoe",
      "ActiveStatus":"true",
      "CurrencyType":"USD",
      "category":"x-example/primary",
      "Groups":"",
      "Timezone":"US/Eastern",
      "ID":"!!pl-10958-611879240",
      "Email":"example1@example.com",
      "Locale":"en_US"
   },
   {  
      "ManagerName":"jdoe",
      "ActiveStatus":"true",
      "CurrencyType":"USD",
      "category":"x-example/primary",
      "Groups":"",
      "Timezone":"US/Eastern",
      "ID":"!!pl-10958-789764779",
      "Email":"example2@example.com",
      "Locale":"en_US"
   }
]

To illustrate how to map this JSON to a Java class, here's an example:

public MyClass {

  @JsonProperty("ManagerName")
  private String managerName;

  @JsonProperty("ActiveStatus")
  private String activeStatus;

  // add more fields as needed

  // include getters and setters    
}

You can use the ObjectMapper from Jackson to map the JSON data to your MyClass:

ObjectMapper mapper = new ObjectMapper();
List<MyClass> objects = mapper.readValue(jsonData, new TypeReference<List<MyClass>>() {});

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