java天气预报

import java.io.BufferedReader;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStreamReader;import java.net.SocketTimeoutException;import java.net.URL;import java.net.URLConnection;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Calendar;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import net.sf.json.JSONObject;/** * 得到未来6天的天气(含今天) */public class Weather {String Ctiyid;URLConnection connectionData;StringBuilder sb;BufferedReader br;// 读取data数据流JSONObject jsonData;JSONObject info;public Weather(String Cityid) throws IOException, NullPointerException {// 解析本机ip地址this.Ctiyid = Cityid;// 连接中央气象台的APIURL url = new URL("http://m.weather.com.cn/data/" + Ctiyid + ".html");connectionData = url.openConnection();connectionData.setConnectTimeout(1000);try {br = new BufferedReader(new InputStreamReader(connectionData.getInputStream(), "UTF-8"));sb = new StringBuilder();String line = null;while ((line = br.readLine()) != null)sb.append(line);} catch (SocketTimeoutException e) {System.out.println("连接超时");} catch (FileNotFoundException e) {System.out.println("加载文件出错");}String datas = sb.toString();jsonData = JSONObject.fromObject(datas);// System.out.println(jsonData.toString());info = jsonData.getJSONObject("weatherinfo");// 得到1到6天的天气情况List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();for (int i = 1; i <= 6; i++) {// 得到未来6天的日期Calendar cal = Calendar.getInstance();cal.add(Calendar.DAY_OF_YEAR, i - 1);Date date = cal.getTime();SimpleDateFormat sf = new SimpleDateFormat("yyyy年MM月dd日");Map<String, Object> map = new HashMap<String, Object>();map.put("city", info.getString("city").toString());// 城市map.put("date_y", sf.format(date));// 日期map.put("week", getWeek(cal.get(Calendar.DAY_OF_WEEK)));// 星期map.put("fchh", info.getString("fchh").toString());// 发布时间map.put("weather", info.getString("weather" + i).toString());// 天气map.put("temp", info.getString("temp" + i).toString());// 温度map.put("wind", info.getString("wind" + i).toString());// 风况map.put("fl", info.getString("fl" + i).toString());// 风速map.put("index", info.getString("index").toString());// 今天的穿衣指数map.put("index_uv", info.getString("index_uv").toString());// 紫外指数map.put("index_tr", info.getString("index_tr").toString());// 旅游指数map.put("index_co", info.getString("index_co").toString());// 舒适指数map.put("index_cl", info.getString("index_cl").toString());// 晨练指数map.put("index_xc", info.getString("index_xc").toString());// 洗车指数map.put("index_d", info.getString("index_d").toString());// 天气详细穿衣指数list.add(map);}// 控制台打印出天气for (int j = 0; j < list.size(); j++) {Map<String, Object> wMap = list.get(j);System.out.println(wMap.get("city") + "\t" + wMap.get("date_y")+ "\t" + wMap.get("week") + "\t" + wMap.get("weather")+ "\t" + wMap.get("temp") + "\t" + wMap.get("index_uv"));}}private String getWeek(int iw) {String weekStr = "";switch (iw) {case 1:weekStr = "星期天";break;case 2:weekStr = "星期一";break;case 3:weekStr = "星期二";break;case 4:weekStr = "星期三";break;case 5:weekStr = "星期四";break;case 6:weekStr = "星期五";break;case 7:weekStr = "星期六";break;default:break;}return weekStr;}public static void main(String[] args) {try {new Weather("101010100"); // 101010100(北京)就是你的城市代码} catch (Exception e) {e.printStackTrace();}}}

运行时报错 引入下列jar包：