java json转义引号

String jsonMapStr = "{\"system\":\"1,\\\"2\\\",3\",\"createDate\":\"2017-02-21\"}";
JSONObject jsonMap = JSONObject.fromObject(jsonMapStr);
Iterator<String> it = jsomMap.keys();
while(it.hasNext()){
String key = (String) it.next();
String value = (String) jsonMap.get(key);
System.out.println(key+":"+value);
}