Convert json string to map

Below program converts json string to a map. This program runs only for primitive types. If json string has complex types like array, nested json objects, it will not work.

Test.java

import java.util.LinkedHashMap;
import java.util.Map;

public class Test {

 public static Map<String, String> getMapFromString(String s) {
  if (s == null || s.isEmpty()) {
   return new LinkedHashMap<>();
  }

  Map<String, String> map = new LinkedHashMap<>();

  String[] tokens = s.split(",");

  for (int i = 0; i < tokens.length; i++) {
   tokens[i] = tokens[i].replace("\"", "");
   tokens[i] = tokens[i].replace("{", "");
   tokens[i] = tokens[i].replace("}", "");
   String[] subparts = tokens[i].split(":");

   if (subparts.length == 2) {
    map.put(subparts[0], subparts[1]);
   } else {
    map.put(subparts[0], "");

   }

  }

  return map;
 }

 public static void main(String args[]) {

  String json = "{\"id\":\"123456\",\"changeToken\":\"token-1234\",\"headerText\":\"\"}";

  Map<String, String> map = getMapFromString(json);

  for (String key : map.keySet()) {
   System.out.println(key + " : " + map.get(key));
  }
 }
}

Output

id : 123456
changeToken : token-1234
headerText :

If you would like to convert complex json string to map, I would suggest you to use libraries like gson, Jackson, genson etc.,

How to convert json string to map using gson?

How to convert json string to map using jackson?

How to convert json string to map using genson?

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gson tutorial

Jackson Tutorial

genson tutorial