JSON使用阿里的fastJson为依赖包

gradle依赖管理如下：

compile group: ‘com.alibaba‘, name: ‘fastjson‘, version:‘1.2.41‘

1、String转JSONObject

前言：String 是JSONObject格式的字符串

eg:

JSONObject jSONObject = JSONObject.parseObject(String);

2、String转JSONArray

前言：String 是JSONArray格式的字符串

eg:

JSONArray jsonArray= JSONArray.parseArray(String);

3、JSONObject中的数组提取为JSONArray

eg:

{"AreaName": "北京","CityId": 110100,"NoMarket": false,"OldCityId": 646,"Pinyin": "beijing","ProvinceId": 110000,"Result": [

{"ItemName": "优惠","ItemUrl": "/list/a646c12-1.html","Title": "Stelvio 钜惠23.4万起","Url": "//www.autohome.com.cn/market/201904/100223763.html"},

{"ItemName": "优惠","ItemUrl": "/list/a646c12-1.html","Title": "马驹桥林肯中心年中大促","Url": "//www.autohome.com.cn/market/201906/100230932.html"},

{"ItemName": "优惠","ItemUrl": "/list/a646c12-1.html","Title": "星越平价销售13.58万元起","Url": "//www.autohome.com.cn/dealer/201906/367011492.html"},

{"ItemName": "优惠","ItemUrl": "/list/a646c12-1.html","Title": "哈弗F5限时优惠8000元","Url": "//www.autohome.com.cn/dealer/201906/366897778.html"},

{"ItemName": "优惠","ItemUrl": "/list/a646c12-1.html","Title": "购元新能源价格暂无优惠","Url": "//www.autohome.com.cn/dealer/201906/366897034.html"},

{"ItemName": "优惠","ItemUrl": "/list/a646c12-1.html","Title": "瑞虎3xe冰点价促销中！","Url": "//www.autohome.com.cn/dealer/201906/366889724.html"},

{"ItemName": "优惠","ItemUrl": "/list/a646c12-1.html","Title": "购奔奔EV现钜惠5.1万元","Url": "//www.autohome.com.cn/dealer/201906/366843204.html"},

{"ItemName": "优惠","ItemUrl": "/list/a646c12-1.html","Title": "购宝马7系价格暂无优惠","Url": "//www.autohome.com.cn/dealer/201906/366588080.html"},

{"ItemName": "预定","ItemUrl": "/list/a646c14-1.html","Title": "途观L价格直降7.6万元","Url": "//www.autohome.com.cn/dealer/201906/366568937.html"},

{"ItemName": "预定","ItemUrl": "/list/a646c14-1.html","Title": "购凯迪拉克XTS降8万","Url": "//www.autohome.com.cn/dealer/201906/366500646.html"},

{"ItemName": "预定","ItemUrl": "/list/a646c14-1.html","Title": "汉兰达可试驾购车无优惠","Url": "//www.autohome.com.cn/dealer/201906/366384207.html"},

{"ItemName": "预定","ItemUrl": "/list/a646c14-1.html","Title": "宝马M4价格稳定无优惠","Url": "//www.autohome.com.cn/dealer/201906/366156789.html"},

{"ItemName": "预定","ItemUrl": "/list/a646c14-1.html","Title": "奥迪A8促销直降26.33万元","Url": "//www.autohome.com.cn/dealer/201906/366925378.html"},

{"ItemName": "预定","ItemUrl": "/list/a646c14-1.html","Title": "英菲尼迪Q50L可降6.3万","Url": "//www.autohome.com.cn/dealer/201906/366863516.html"},

{"ItemName": "预定","ItemUrl": "/list/a646c14-1.html","Title": "帝豪新能源价格降8.25万","Url": "//www.autohome.com.cn/dealer/201906/366877669.html"},

{"ItemName": "预定","ItemUrl": "/list/a646c14-1.html","Title": "撼路者在售现钜惠5万","Url": "//www.autohome.com.cn/dealer/201906/366912121.html"}

]

}

提取Result对应的数组

JSONArray jsonArray= jsonObject.getJSONArray("Result");

4、JSONArray提取为JSONObject

eg:

JSONObject jsonObject = jsonArray.getJSONObject(0);

5、JSONObject获取value

1、object.getString("key")2、object.get("key")

6、获取JSONObject的ket value

JSONArray dateArr = newJSONArray();

Set key =dateArr .keySet();for(String keyObj:key) {

JSONArray hisData=history.getJSONArray(keyObj);

}

7、遍历JSONArray

第一种for循环

JSONArray seriesArr= newJSONArray();for(int i=0;i

JSONObject object=eggsArr.getJSONObject(i);

}

第二种for增强

JSONArray pzListArr= newJSONArray();for(Object obj:pzListArr) {

JSONObject dataObj=JSONObject.parseObject(obj.toString());

}

8、javaBean转为JSONObject

未完待续······