how can i create a json using javaobject.?

Question

how can i create a json using javaobject. ? I did it, but I'm getting an error.

I need to build a body to parse within the PUT request. If anyone can help me.

public static String generateJSON(String status, String assignee, String comment,String data, String filename, String contentType) throws IOException {

          JSONArray jsonArray = new JSONArray();

          JSONObject statusObj = new JSONObject();
          statusObj.put("status", status);
          statusObj.put("comment", comment); 
          statusObj.put("assignee", assignee); 
          statusObj.put("comment", comment);
          
          JSONObject evidenceObj = new JSONObject();
          evidenceObj.put("evidence", "newXML");
          evidenceObj.put("data", data);
          evidenceObj.put("filename", filename);
          evidenceObj.put("contentType", contentType);

          // Add the objects to the jsonArray
          jsonArray.add(evidenceObj);
          
          // Add the key tests jsonObject to the jsonArray
          evidenceObj.put("add", jsonArray);

          String jsonString = evidenceObj.toString();
          
          return jsonString;
       } 

Answer 1

Why not just to create your own Class with needed fields, and then use jackson library to convert it to JSON string, use method writeValueAsString().

Example:

import com.fasterxml.jackson.databind.ObjectMapper;

public static void main(String[] args) throws Exception
{
    Example exObject = new Example();
    exObject.setField1("data");
    exObject.setField2("second data");
    exObject.setField3(72);

    System.out.println(new ObjectMapper().writeValueAsString(exObject));
}

Log console:

Output:
{
  "field1" : "data",
  "field2" : "second data",
  "field3" : 72
}

Example class is:

private static class Example
{
    private String field1;
    private String field2;
    private int field3;

    public String getField1()
    {
        return field1;
    }

    public void setField1(String field1)
    {
        this.field1 = field1;
    }

    public String getField2()
    {
        return field2;
    }

    public void setField2(String field2)
    {
        this.field2 = field2;
    }

    public int getField3()
    {
        return field3;
    }

    public void setField3(int field3)
    {
        this.field3 = field3;
    }
}

Note: Example class must have getter + setter methods for all fields