Java小实例

2024-07-11 13:20| 来源: 网络整理| 查看: 265

1.构造一个天气的模型（类）

public class WeatherInfo { private String date;//时间 private String cityname;//城市名 private String weather;//天气 private String temperature;//气温 private String airquality;//pm2.5 public String getDate() { return date; } public void setDate(String date) { this.date = date; } public String getCityname() { return cityname; } public void setCityname(String cityname) { this.cityname = cityname; } public String getWeather() { return weather; } public void setWeather(String weather) { this.weather = weather; } public String getTemperature() { return temperature; } public void setTemperature(String temperature) { this.temperature = temperature; } public String getAirquality() { return airquality; } public void setAirquality(String airquality) { this.airquality = airquality; } @Override public String toString() { return "WeatherInfo [date=" + date + ", cityname=" + cityname + ", weather=" + weather + ", temperature=" + temperature + ", airquality=" + airquality + "]"; } }

2.编写通过天气API获取天气信息和解析数据的的方法类

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.UnsupportedEncodingException; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import java.net.URLEncoder; import java.util.zip.GZIPInputStream; import net.sf.json.JSONArray; import net.sf.json.JSONObject; import org.junit.Test; /** * 通过get请求向网站http://wthrcdn.etouch.cn/weather_mini获取某个城市的天气状况数据，数据格式是Json * * @author 22786 * */ public class WeatherUtils { /** * 通过城市名称获取该城市的天气信息 * * @param cityName * @return */ public static String GetWeatherData(String cityname) { StringBuilder sb=new StringBuilder();; try { //cityname = URLEncoder.encode(cityName, "UTF-8"); String weather_url = "http://wthrcdn.etouch.cn/weather_mini?city="+cityname; URL url = new URL(weather_url); URLConnection conn = url.openConnection(); InputStream is = conn.getInputStream(); GZIPInputStream gzin = new GZIPInputStream(is); InputStreamReader isr = new InputStreamReader(gzin, "utf-8"); // 设置读取流的编码格式，自定义编码 BufferedReader reader = new BufferedReader(isr); String line = null; while((line=reader.readLine())!=null) sb.append(line+" "); reader.close(); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } //System.out.println(sb.toString()); return sb.toString(); } /** * 将JSON格式数据进行解析，返回一个weather对象 * @param str * @return */ public static WeatherInfo GetWeather(String weatherInfobyJson){ JSONObject dataOfJson = JSONObject.fromObject(weatherInfobyJson); if(dataOfJson.getInt("status")!=1000) return null; //创建WeatherInfo对象，提取所需的天气信息 WeatherInfo weatherInfo = new WeatherInfo(); //从json数据中提取数据 String data = dataOfJson.getString("data"); dataOfJson = JSONObject.fromObject(data); weatherInfo.setCityname(dataOfJson.getString("city"));; weatherInfo.setAirquality(dataOfJson.getString("aqi")); //获取预测的天气预报信息 JSONArray forecast = dataOfJson.getJSONArray("forecast"); //取得当天的 JSONObject result=forecast.getJSONObject(0); weatherInfo.setDate(result.getString("date")); String high = result.getString("high").substring(2); String low = result.getString("low").substring(2); weatherInfo.setTemperature(low+"~"+high); weatherInfo.setWeather(result.getString("type")); return weatherInfo; } }

3.测试类

public class Test { public static void main(String[] args){ String info = WeatherUtils.GetWeatherData("武汉"); WeatherInfo weatherinfo = WeatherUtils.GetWeather(info); System.out.println(weatherinfo.toString()); } }

4.通过天气API获取到的JSON串

{"data":{"yesterday":{"date":"20日星期一","high":"高温 12℃","fx":"无持续风向","low":"低温 3℃","fl":"","type":"晴"},"city":"武汉","aqi":"105","forecast":[{"date":"21日星期二","high":"高温 13℃","fengli":"","low":"低温 6℃","fengxiang":"无持续风向","type":"多云"},{"date":"22日星期三","high":"高温 13℃","fengli":"","low":"低温 4℃","fengxiang":"北风","type":"多云"},{"date":"23日星期四","high":"高温 14℃","fengli":"","low":"低温 3℃","fengxiang":"无持续风向","type":"多云"},{"date":"24日星期五","high":"高温 15℃","fengli":"","low":"低温 3℃","fengxiang":"无持续风向","type":"多云"},{"date":"25日星期六","high":"高温 16℃","fengli":"","low":"低温 4℃","fengxiang":"无持续风向","type":"多云"}],"ganmao":"天凉，昼夜温差较大，较易发生感冒，请适当增减衣服，体质较弱的朋友请注意适当防护。","wendu":"10"},"status":1000,"desc":"OK"}

5.通过解析获得自己所需的数据

WeatherInfo [date=21日星期二, cityname=武汉, weather=多云, temperature= 6℃~ 13℃, airquality=105]

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Java小实例

Java小实例

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