Gson实现复杂json字符串转bean

Gson实现复杂json字符串转bean

要解析的数据

[
    {
        "airCondition": "良",
        "city": "保定",
        "coldIndex": "易发期",
        "date": "2018-06-21",
        "distrct": "保定",
        "dressingIndex": "薄短袖类",
        "exerciseIndex": "不适宜",
        "future": [
            {
                "date": "2018-06-21",
                "dayTime": "多云",
                "night": "阴",
                "temperature": "35°C / 24°C",
                "week": "今天",
                "wind": "南风 3～4级"
            },
            {
                "date": "2018-06-22",
                "dayTime": "多云",
                "night": "多云",
                "temperature": "34°C / 24°C",
                "week": "星期五",
                "wind": "南风 3～4级"
            },
            {
                "date": "2018-06-23",
                "dayTime": "晴",
                "night": "多云",
                "temperature": "36°C / 25°C",
                "week": "星期六",
                "wind": "南风 小于3级"
            },
            {
                "date": "2018-06-24",
                "dayTime": "多云",
                "night": "多云",
                "temperature": "35°C / 23°C",
                "week": "星期日",
                "wind": "南风 3～4级"
            },
            {
                "date": "2018-06-25",
                "dayTime": "阴",
                "night": "阴",
                "temperature": "35°C / 25°C",
                "week": "星期一",
                "wind": "南风 3～4级"
            },
            {
                "date": "2018-06-26",
                "dayTime": "多云",
                "night": "多云",
                "temperature": "34°C / 24°C",
                "week": "星期二",
                "wind": "南风 小于3级"
            }
        ],
        "humidity": "湿度：55%",
        "pollutionIndex": "78",
        "province": "河北",
        "sunrise": "04:59",
        "sunset": "19:45",
        "temperature": "29℃",
        "time": "09:21",
        "updateTime": "20180621093612",
        "washIndex": "非常适宜",
        "weather": "阴",
        "week": "周四",
        "wind": "西风1级"
    }
]

1.定义一个bean

实现方式：新建一个java类，右键“Generate...”，选择“GsonFormat”，将json数据复制到输入框，点击“OK”，即可生成一个bean，如下所示：

public class WeatherBean {
    private String airCondition;
    private String city;
    private String coldIndex;
    private String date;
    private String distrct;
    private String dressingIndex;
    private String exerciseIndex;
    private String humidity;
    private String pollutionIndex;
    private String province;
    private String sunrise;
    private String sunset;
    private String temperature;
    private String time;
    private String updateTime;
    private String washIndex;
    private String weather;
    private String week;
    private String wind;

    private List<FutureBean> future;

    public String getAirCondition() {
        return airCondition;
    }

    public void setAirCondition(String airCondition) {
        this.airCondition = airCondition;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getColdIndex() {
        return coldIndex;
    }

    public void setColdIndex(String coldIndex) {
        this.coldIndex = coldIndex;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public String getDistrct() {
        return distrct;
    }

    public void setDistrct(String distrct) {
        this.distrct = distrct;
    }

    public String getDressingIndex() {
        return dressingIndex;
    }

    public void setDressingIndex(String dressingIndex) {
        this.dressingIndex = dressingIndex;
    }

    public String getExerciseIndex() {
        return exerciseIndex;
    }

    public void setExerciseIndex(String exerciseIndex) {
        this.exerciseIndex = exerciseIndex;
    }

    public String getHumidity() {
        return humidity;
    }

    public void setHumidity(String humidity) {
        this.humidity = humidity;
    }

    public String getPollutionIndex() {
        return pollutionIndex;
    }

    public void setPollutionIndex(String pollutionIndex) {
        this.pollutionIndex = pollutionIndex;
    }

    public String getProvince() {
        return province;
    }

    public void setProvince(String province) {
        this.province = province;
    }

    public String getSunrise() {
        return sunrise;
    }

    public void setSunrise(String sunrise) {
        this.sunrise = sunrise;
    }

    public String getSunset() {
        return sunset;
    }

    public void setSunset(String sunset) {
        this.sunset = sunset;
    }

    public String getTemperature() {
        return temperature;
    }

    public void setTemperature(String temperature) {
        this.temperature = temperature;
    }

    public String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public String getUpdateTime() {
        return updateTime;
    }

    public void setUpdateTime(String updateTime) {
        this.updateTime = updateTime;
    }

    public String getWashIndex() {
        return washIndex;
    }

    public void setWashIndex(String washIndex) {
        this.washIndex = washIndex;
    }

    public String getWeather() {
        return weather;
    }

    public void setWeather(String weather) {
        this.weather = weather;
    }

    public String getWeek() {
        return week;
    }

    public void setWeek(String week) {
        this.week = week;
    }

    public String getWind() {
        return wind;
    }

    public void setWind(String wind) {
        this.wind = wind;
    }

    public List<FutureBean> getFuture() {
        return future;
    }

    public void setFuture(List<FutureBean> future) {
        this.future = future;
    }

    public static class FutureBean {
        private String date;
        private String dayTime;
        private String night;
        private String temperature;
        private String week;
        private String wind;

        public String getDate() {
            return date;
        }

        public void setDate(String date) {
            this.date = date;
        }

        public String getDayTime() {
            return dayTime;
        }

        public void setDayTime(String dayTime) {
            this.dayTime = dayTime;
        }

        public String getNight() {
            return night;
        }

        public void setNight(String night) {
            this.night = night;
        }

        public String getTemperature() {
            return temperature;
        }

        public void setTemperature(String temperature) {
            this.temperature = temperature;
        }

        public String getWeek() {
            return week;
        }

        public void setWeek(String week) {
            this.week = week;
        }

        public String getWind() {
            return wind;
        }

        public void setWind(String wind) {
            this.wind = wind;
        }
    }
}

注意
- 内部嵌套的类必须是static的，要不然解析会出错；
- 类里面的属性名必须跟Json字段里面的Key是一模一样的；
- 内部嵌套的用[]括起来的部分是一个List，所以定义为 public List<B> b，而只用{}嵌套的就定义为public C c。

2.Gson解析json字符串

Gson gson = new Gson();
String jsonStr = gson.toJson(map.get("result"));       //获取返回结果字符串
Type type = new TypeToken<List<WeatherBean>>() {
}.getType();        //List<bean>类型
List<WeatherBean> weathers = gson.fromJson(jsonStr, type);         //天气数组

3.获取数据

List<WeatherBean.FutureBean> future = weatherBean.getFuture();      //FutureBean数据
weatherBean.getCity()    //weatherBean其他数据