用JSONObject和JSONArray 解析json数据

来源：互联网发布：数据采集卡工作原理编辑：程序博客网时间：2024/06/11 17:27

json数据：

{     "resultcode": "200",    "reason": "SUCCESSED!",    "result": [         {             "city": "苏州",              "PM2.5": "73",              "AQI": "98",                "quality": "良",             "PM10": "50",            "CO": "0.79",              "NO2": "65",              "O3": "28",               "SO2": "41",             "time": "2014-12-26 11:48:40"        }    ],    "error_code": 0}

解析数据代码：

 JSONObject jsonObject = new JSONObject(result);            int resultCode = jsonObject.getInt("resultcode");            if (resultCode == 200) {                JSONArray resultJsonArray = jsonObject.getJSONArray("result");                JSONObject resultJsonObject = resultJsonArray.getJSONObject(0);//如果是用第一个对象就如下所写的，如果是数组就用循环，在新建一对象resultJsonObject              String output =  resultJsonObject.getString("city");                       resultJsonObject.getString("PM2.5") ;                      resultJsonObject.getString("AQI");                      resultJsonObject.getString("quality");                        resultJsonObject.getString("PM10");                       resultJsonObject.getString("CO") ;                       resultJsonObject.getString("NO2") ;                       resultJsonObject.getString("O3") ;                       resultJsonObject.getString("SO2") ;                      resultJsonObject.getString("time");           }

json数据：

  {        "crset":[            {                "merchantname":"三火餐厅",                "menu":[                    {                        "menuid":"1",                        "menuname":"酸菜鱼"                    },                    {                        "menuid":"2",                        "menuname":"麻婆豆腐"                    },                    {                        "menuid":"3",                        "menuname":"酸菜鱼"                    }                ]            },            {                "merchantname":"粤菜餐厅",                "menu":[                    {                        "menuid":"1",                        "menuname":"炒生菜"                    },                    {                        "menuid":"2",                        "menuname":"蒸鱼"                    },                    {                        "menuid":"3",                        "menuname":"煎豆腐"                    }                ]            },            {                "merchantname":"西式餐厅",                "menu":[                    {                        "menuid":"1",                        "menuname":"牛扒"                    },                    {                        "menuid":"2",                        "menuname":"罗宋汤"                    },                    {                        "menuid":"3",                        "menuname":"三文治"                    }                ]            }        ]    }

生成实体类：

public class Merchants {private List<Merchant> merchant;}

public class Merchant{private String merchantname;private List<Menu> menu;}

public class Menu {private String menuid;private String menuname;}

解析数据如下

JSONObject jsonObject = new JSONObject(json);// json上方返回的数据JSONArray jsonArray =jsonObject.getJSONArray("crset");List<Merchant> merchants = new ArrayList<Merchant>();for(int i = 0;i<jsonArray.length();i++){// 解析每个merchantJSONObject item = jsonArray.getJSONObject(i);Merchant merchant = new Merchant();merchant.setMerchantname(item.getString("merchantname"));// 解析每个menuList<Menu> menus = new ArrayList<Menu>();JSONArray array = item.getJSONArray("menu");for (int j = 0; j < array.length(); j++) {JSONObject menuitem = array.getJSONObject(i);Menu menu = new Menu();menu.setMenuid(menuitem.getString("menuid"));menu.setMenuname(menuitem.getString("menuname"));menus.add(menu);}merchant.setMenu(menus);merchants.add(merchant);}

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