JSON使用阿里的fastJson為依賴包

gradle依賴管理如下：

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

1、String轉JSONObject

前言：String 是JSONObject格式的字串

eg:

JSONObject jSONObject = JSONObject.parseObject(String);

2、String轉JSONArray

前言：String 是JSONArray格式的字串

eg:

JSONArray jsonArray= JSONArray.parseArray(String);

3、JSONObject中的陣列提取為JSONArray

eg:

{
  "AreaName": "北京","CityId": 110100,"NoMarket": false,"OldCityId": 646,"Pinyin": "beijing","ProvinceId": 110000,"Result": [
    {
      "ItemName": "優惠","ItemUrl": "/list/a646c12-1.html","Title": "Stelvio 鉅惠23.4萬起","Url": "//www.autohome.com.cn/market/201904/100223763.html"
    },{
      "ItemName": "優惠","Title": "馬駒橋林肯中心年中大促","Url": "//www.autohome.com.cn/market/201906/100230932.html"
    },"Title": "星越平價銷售13.58萬元起","Url": "//www.autohome.com.cn/dealer/201906/367011492.html"
    },"Title": "哈弗F5限時優惠8000元","Url": "//www.autohome.com.cn/dealer/201906/366897778.html"
    },"Title": "購元新能源價格暫無優惠","Url": "//www.autohome.com.cn/dealer/201906/366897034.html"
    },"Title": "瑞虎3xe冰點價促銷中！","Url": "//www.autohome.com.cn/dealer/201906/366889724.html"
    },"Title": "購奔奔EV現鉅惠5.1萬元","Url": "//www.autohome.com.cn/dealer/201906/366843204.html"
    },"Title": "購寶馬7系價格暫無優惠","Url": "//www.autohome.com.cn/dealer/201906/366588080.html"
    },{
      "ItemName": "預定","ItemUrl": "/list/a646c14-1.html","Title": "途觀L價格直降7.6萬元","Url": "//www.autohome.com.cn/dealer/201906/366568937.html"
    },"Title": "購凱迪拉克XTS降8萬","Url": "//www.autohome.com.cn/dealer/201906/366500646.html"
    },"Title": "漢蘭達可試駕購車無優惠","Url": "//www.autohome.com.cn/dealer/201906/366384207.html"
    },"Title": "寶馬M4價格穩定無優惠","Url": "//www.autohome.com.cn/dealer/201906/366156789.html"
    },"Title": "奧迪A8促銷直降26.33萬元","Url": "//www.autohome.com.cn/dealer/201906/366925378.html"
    },"Title": "英菲尼迪Q50L可降6.3萬","Url": "//www.autohome.com.cn/dealer/201906/366863516.html"
    },"Title": "帝豪新能源價格降8.25萬","Url": "//www.autohome.com.cn/dealer/201906/366877669.html"
    },"Title": "撼路者在售現鉅惠5萬","Url": "//www.autohome.com.cn/dealer/201906/366912121.html"
    }
  ]
}

提取Result對應的陣列

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

4、JSONArray提取為JSONObject

eg:

JSONObject jsonObject = jsonArray.getJSONObject(0);

5、JSONObject獲取value

1、object.getString("key")

2、object.get("key")

6、獲取JSONObject的ket value

 JSONArray dateArr = new JSONArray();
    Set<String> key = dateArr .keySet();
    for (String keyObj:key) {
      JSONArray hisData = history.getJSONArray(keyObj);      
    }

7、遍歷JSONArray

第一種for迴圈
        JSONArray seriesArr = new JSONArray();
        for(int i=0;i<seriesArr .size();i++){
          JSONObject object = eggsArr.getJSONObject(i);
        }


第二種for增強
        JSONArray pzListArr = new JSONArray();
        for (Object obj:pzListArr) {
          JSONObject dataObj = JSONObject.parseObject(obj.toString());
        }

8、

Map<String,Object> paraMap = new HashMap<String,Object>();

JSONObject.toJSONString(paraMap)

自動過濾引數為null的數值

8、javaBean轉為JSONObject

未完待續······

9、List<實體類>轉String

import com.alibaba.fastjson.JSONObject;


List<實體類> value1 = 。。。。。。
JSONObject.toJSONString(value1 )10、JSONArray轉List<實體類>

看你開心用哪個，object和array的區別沒有細究

10、JSONArray轉List<實體類>

import com.alibaba.fastjson.JSONArray;
JSONArray objects = JSONArray.parseArray(categoryConstantInfoFromRedis);
List<實體類> categoryConstantInfos = objects.toJavaList(實體類名.class);
眾裡尋他千百度！！！toJavaList

找不到方法的時候，去看看JSONArray，JSONObject的原始碼，很多都有封裝好的，你不會失望的

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