1

I want to store an array of JSON Object into POJO class dynamically how can I do this particular thing in java.

[
{
"history":"L",
"loan":"12345"
"status":1
.
.
},
{
"History":"L",
"loan":"67890"
"status":1
.
.
},
....
]
Alex
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Mandar Pradhan
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  • you can create POJO class with same property and use jackson to map automatically. refer any spring boot rest api example to understand it better – Dhrumil Shah May 30 '19 at 05:41
  • Use below link to understand it https://dzone.com/articles/converting-json-to-pojos-using-java – Dhrumil Shah May 30 '19 at 05:44
  • i have done that currently but i wanna do it directly on basis of Body Response without evening seeing the response JSON keys – Mandar Pradhan May 30 '19 at 06:02

3 Answers3

4

You need to have a model calss. lets say your json-string is like this :

String temp_json_string = "{ \"history\":\"L\", \"loan\":\"12345\", \"status\":\"1\"}";

Go to this or similar site and generate a class for your temp_json_string by pasting json string in that link and get class, choose getters and setters if you need.

http://www.jsonschema2pojo.org/

Create a new gson/jackson object (import that library either maven or build jre system path), convert the string to this "BankLoanDetails" class. 

    Gson gson = new Gson(); 
    BankLoanDetails my_loan_pojo = gson.fromJson(temp_json_string, 
                                                   BankLoanDetails.class);

your my_loan_pojo is pojo representing your json string.

Did you check at Safely turning a JSON string into an object

driven_spider
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0

I am extending Akash's answer.

import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.type.TypeFactory;

---

ObjectMapper mapper = new ObjectMapper();

List<DTO> list = mapper.readValue(JSONString, TypeFactory.collectionType(List.class, DTO.class));
Nitika Bansal
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Vivek Nerle
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-1

First Create a POJO Class something like this: 

public class Loan {
    private String history;
    private String loan;
    private int status;

    \\ generate getters,setters and toString method 
}

Now parse your json and convert into jSONArray (import json-simple library), 

        String path = "path to your json file";
        File f = new File(path);
        JSONParser parser = new JSONParser();
        Object obj = parser.parse(new FileReader(f));
        JSONArray jsonArray = (JSONArray) obj;

Now

  1. Create a new ObjectMapper's object (import jackson-databind library),
  2. convert parsed JSONArray to json string using writeValueAsString method,
  3. and again convert it into list of "Loan" Class. 
        ObjectMapper mapper = new ObjectMapper();
        String jsonStr = mapper.writeValueAsString(jsonArray);
        List<Loan> loanList = Arrays.asList(mapper.readValue(jsonStr, Loan[].class));
        for (Loan l : loanList)
            System.out.println(l);

Note : your json array contains different keys as history(first object) and History(second object). change it to history as in Loan class, data member is history.

Nitika Bansal
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