java中获取json的所有key方法

String json="{'name':'angui','age':'23','like':'吃水果'}";JSONObject j = JSON.parseObject(json);j.remove("age");System.out.println(json.toString());System.out.println(j.toJSONString());//将json转换为key=value&key=value&...的形式StringBuilder sb = new StringBuilder();String sbString="";try {	org.json.JSONObject jsonObject = new org.json.JSONObject(json);	Iterator iterator = jsonObject.keys();	while(iterator.hasNext()){String key = (String) iterator.next();	    	sb.append("&"+key);	    	sb.append("="+jsonObject.getString(key));	}	sb.append("&key");	sbString = sb.substring(1);} catch (JSONException e) {	e.printStackTrace();}System.out.println(sbString);