58688079-2987755.md

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.google.gson.reflect.TypeToken;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

public class App {
    public static void main(String[] args) throws Exception {
        a();
       // output:
       /*
Inside Date serialize2019-11-04 11:34:05
Inside Timestamp serialize2019-11-04 11:34:05
Inside Date serialize2019-11-04 11:34:05
Inside Timestamp serialize2019-11-04 11:34:05     
       
[
  {
    "id": 1,
    "userId": 1,
    "departmentId": 0,
    "effectiveFrom": "Nov 4, 2019",
    "endsOn": "2019-11-04 11:34:05",
    "createdBy": 0,
    "createdOn": "2019-11-04 11:34:05"
  },
  {
    "id": 1,
    "userId": 1,
    "departmentId": 0,
    "effectiveFrom": "Nov 4, 2019",
    "endsOn": "2019-11-04 11:34:05",
    "createdBy": 0,
    "createdOn": "2019-11-04 11:34:05"
  }
]
       */
    }
    
    private static String a() {
        Gson gson;
        GsonBuilder builder;
        SimpleDateFormat dtf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.ENGLISH);
        SimpleDateFormat dtfDate=new SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH);
        String jsonAccts = null;
        try{
            builder = new GsonBuilder();
            builder.registerTypeAdapter(Timestamp.class, new JsonSerializer<Timestamp>() {
                @Override
                public JsonElement serialize(Timestamp src, Type typeOfSrc, JsonSerializationContext context) {
                    dtf.setTimeZone(TimeZone.getTimeZone("UTC"));
                    String jsDate = dtf.format(src);
                    System.out.println("Inside Timestamp serialize" + jsDate);
                    return new JsonPrimitive(jsDate);
                }
            });
            builder.registerTypeAdapter(Date.class, new JsonSerializer<Date>() {
                @Override
                public JsonElement serialize(Date src, Type typeOfSrc, JsonSerializationContext context) {
                    dtf.setTimeZone(TimeZone.getTimeZone("UTC"));
                    String jsDate = dtf.format(src);
                    System.out.println("Inside Date serialize" + jsDate);
                    return new JsonPrimitive(jsDate);
                }
            });
            gson = builder.create();
            List<ClassTeacher> allActPgmMap = new ArrayList<ClassTeacher>();
            ClassTeacher c1 = new ClassTeacher();
            c1.setId(1);
            c1.setUserId(1);
            c1.setCreatedOn(new Timestamp(System.currentTimeMillis()));
            c1.setEndsOn(new java.util.Date());
            c1.setEffectiveFrom(new java.sql.Date(System.currentTimeMillis()));

            ClassTeacher c2 = new ClassTeacher();
            c2.setId(1);
            c2.setUserId(1);
            c2.setCreatedOn(new Timestamp(System.currentTimeMillis()));
            c2.setEndsOn(new java.util.Date());
            c2.setEffectiveFrom(new java.sql.Date(System.currentTimeMillis()));
            allActPgmMap.add(c1);
            allActPgmMap.add(c2);
            Type listType = new TypeToken<List<ClassTeacher>>() {}.getType();
            jsonAccts = gson.toJson(allActPgmMap, listType);
            System.out.println(jsonAccts);
        }catch(Exception e){
            e.printStackTrace();
        }
        return jsonAccts;
    }
    
}