Map to JSON 

JSON-lib is a java library for serializing and de-serializing java beans, maps, arrays and collections in JSON format. Get the latest binaries from sourceforge http://json-lib.sourceforge.net/. This requires the libraries ( json-lib-2.4-jdk15.jar, xom-1.2.7.jar, ezmorph.jar commons-lang.jar, commons-collections.jar, commons-beanutils-1.7.jar and commons-logging-1.1.1.jar) to be in classpath. The following example shows converting a Map to JSON Object.

File Name  :   com/bethecoder/tutorials/json_lib/tests/Map2Json.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.json_lib.tests; import java.util.Date; import java.util.HashMap; import java.util.Map; import net.sf.json.JSONObject; import net.sf.json.JSONSerializer; public class Map2Json {   /**    * @param args    */   public static void main(String[] args) {     Map<String, Object> map = new HashMap<String, Object>();     map.put("name", "Sriram");     map.put("age", 2);     map.put("dob", new Date(110, 4, 6));     map.put("hobby", "painting");          JSONObject obj = (JSONObject) JSONSerializer.toJSON(map);     System.out.println(obj.toString(2)); //pretty print with indent   } }

{
  "dob":   {
    "date": 6,
    "day": 4,
    "hours": 0,
    "minutes": 0,
    "month": 4,
    "seconds": 0,
    "time": 1273084200000,
    "timezoneOffset": -330,
    "year": 110
  },
  "age": 2,
  "name": "Sriram",
  "hobby": "painting"
}