//json字符串
String jsondata="{\"contend\":[{\"bid\":\"22\",\"carid\":\"0\"},{\"bid\":\"编程客栈22\",\"carid\"编程客栈:\"0\"}],\"result\":100,\"total\":2}";
JSONObject obj= JSON.parseObhttp://www.cppcns.comject(jsondata);
//map对象
Map<String, Object> data =new HashMap<>();
//循环转换
 Iterator it =obj.entrySet().iterator();
 while (it.hasNext()) {
  Map.Entry<String, Object> entry = (Entry<String, Object>) it.next();
  data.put(entry.getKey(), entry.getValue());
 }
System.out.println("map对象:"+data.toString());

//map对象
Map<String, Object> data =new HashMap<>();
String x =JSONObject.toJSONString(data);
System.out.println("json字符串:"+x);