解析JSONObject为key-value

String params="";//json格式的字符串

JSONObject  data = JSONObject .fromObject(params);

Set<Map.Entry<String, Object>> entries = data.entrySet();

Iterator<Map.Entry<String, Object>> it = entries.iterator();

String param="";

while (it.hasNext()) {

      Map.Entry<String, Object> next = it.next();

      String key = next.getKey();

      Object value = next.getValue();

　   param+=key+"="+value;

}

System.out.println(param);