新人求助，这一段JSON如何用java解析？

Question

 {
  "results": [{
    "location": {
      "id": "WX4FBXXFKE4F",
      "name": "北京",
      "country": "CN",
      "path": "北京,北京,中国",
      "timezone": "Asia/Shanghai",
      "timezone_offset": "+08:00"
    },
    "daily": [{                         //返回指定days天数的结果
      "date": "2015-09-20",             //日期
      "text_day": "多云",               //白天天气现象文字
      "code_day": "4",                  //白天天气现象代码
      "text_night": "晴",               //晚间天气现象文字
      "code_night": "0",                //晚间天气现象代码
      "high": "26",                     //当天最高温度
      "low": "17",                      //当天最低温度
      "precip": "0",                    //降水概率，范围0~100，单位百分比
      "wind_direction": "",             //风向文字
      "wind_direction_degree": "255",   //风向角度，范围0~360
      "wind_speed": "9.66",             //风速，单位km/h（当unit=c时）、mph（当unit=f时）
      "wind_scale": ""                  //风力等级
    }, {
      "date": "2015-09-21",
      "text_day": "晴",
      "code_day": "0",
      "text_night": "晴",
      "code_night": "0",
      "high": "27",
      "low": "17",
      "precip": "0",
      "wind_direction": "",
      "wind_direction_degree": "157",
      "wind_speed": "17.7",
      "wind_scale": "3"
    }, {
    }],
    "last_update": "2015-09-20T18:00:00+08:00" //数据更新时间（该城市的本地时间）
  }]
}

如果我想得到name:北京 该怎么写java代码呢？

Answer 1

package com.six;
import java.util.List;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class JSONParse {

    private static String jsonString = "{\"results\":[{\"location\":{\"id\":\"WX4FBXXFKE4F\",\"name\":\"北京\",\"country\":\"CN\",\"path\":\"北京,北京,中国\",\"timezone\":\"Asia/Shanghai\",\"timezone_offset\":\"+08:00\"},\"daily\":[{\"date\":\"2015-09-20\",\"text_day\":\"多云\",\"code_day\":\"4\",\"text_night\":\"晴\",\"code_night\":\"0\",\"high\":\"26\",\"low\":\"17\",\"precip\":\"0\",\"wind_direction\":\"\",\"wind_direction_degree\":\"255\",\"wind_speed\":\"9.66\",\"wind_scale\":\"\"},{\"date\":\"2015-09-21\",\"text_day\":\"晴\",\"code_day\":\"0\",\"text_night\":\"晴\",\"code_night\":\"0\",\"high\":\"27\",\"low\":\"17\",\"precip\":\"0\",\"wind_direction\":\"\",\"wind_direction_degree\":\"157\",\"wind_speed\":\"17.7\",\"wind_scale\":\"3\"},{}],\"last_update\":\"2015-09-20T18:00:00+08:00\"}]}";

    public static void main(String[] args) {
        JSONObject json = JSON.parseObject(jsonString);
        JSONArray jsonArray = json.getJSONArray("results");
        List<JSONObject> lists = JSONArray.parseArray(jsonArray.toJSONString(), JSONObject.class);
        for (JSONObject item : lists) {
            for (String key : item.keySet()) {
                if (key.equals("location")) {
                    JSONObject location_json = item.getJSONObject("location");
                    // print the value of name
                    if (location_json.containsKey("name")) {
                        System.out.println(location_json.getString("name"));
                    }
                    return;
                }
            }
        }
    }
}

maven dependency
如果不是使用maven编译项目，请手动引入com.alibaba.fastjson依赖包

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.7</version>
</dependency>