Java 获得天气信息

前面我们讲了java操作json的一些基本操作，现在就将他应用于实战中:

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 net.sf.json.JSONObject;

public class Weather {
String Ctiyid;
URLConnection connectionData;
StringBuilder sb;
BufferedReader br;// 读取data数据流
JSONObject jsonData;
JSONObject info;

//从天气网解析的参数
String city ;// 城市
String date_y;//日期
String week ;// 星期
String fchh ;// 发布时间

String weather1 ;// 未来1到6天天气情况
String weather2 ;
String weather3 ;
String weather4 ;
String weather5 ;
String weather6 ;

String wind1;//未来1到6天风况
String wind2;
String wind3;
String wind4;
String wind5;
String wind6;

String fl1;//风的等级
String fl2;
String fl3;
String fl4;
String fl5;
String fl6;

String temp1 ;// 未来1到6天的气温
String temp2 ;
String temp3 ;
String temp4 ;
String temp5 ;
String temp6 ;

String index;// 今天的穿衣指数
String index_uv ;// 紫外指数
String index_tr ;// 旅游指数
String index_co ;// 舒适指数
String index_cl ;// 晨练指数
String index_xc;//洗车指数
String index_d;//天气详细穿衣指数

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API
URL 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");

city = info.getString("city").toString();
System.out.println(city);
week =  info.getString("week").toString();
date_y = info.getString("date_y").toString();
fchh = info.getString("fchh").toString();
//1到6天的天气
weather1 =  info.getString("weather1").toString();
System.out.println(weather1);
weather2 =  info.getString("weather2").toString();
weather3 =  info.getString("weather3").toString();
weather4 =  info.getString("weather4").toString();
weather5 =  info.getString("weather5").toString();
weather6 =  info.getString("weather6").toString();
//1到6天的气温
temp1 = info.getString("temp1").toString();
temp2 = info.getString("temp2").toString();
temp3 = info.getString("temp3").toString();
temp4 = info.getString("temp4").toString();
temp5 = info.getString("temp5").toString();
temp6 = info.getString("temp6").toString();
//1到6天的风况
wind1 = info.getString("wind1").toString();
wind2 = info.getString("wind2").toString();
wind3 = info.getString("wind3").toString();
wind4 = info.getString("wind4").toString();
wind5 = info.getString("wind5").toString();
wind6 = info.getString("wind6").toString();
//1到6天的风速
fl1 = info.getString("fl1").toString();
fl2 = info.getString("fl2").toString();
fl3 = info.getString("fl3").toString();
fl4 = info.getString("fl4").toString();
fl5 = info.getString("fl5").toString();
fl6 = info.getString("fl6").toString();
//各种天气指数
index = info.getString("index").toString();
index_uv = info.getString("index_uv").toString();
index_tr = info.getString("index_tr").toString();
index_co= info.getString("index_co").toString();
index_cl = info.getString("index_cl").toString();
index_xc = info.getString("index_xc").toString();
index_d =  info.getString("index_d").toString();

}
public static void main(String[] args) {
try {
new Weather("101270803"); // 101270803就是你的城市代码
} catch (NullPointerException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
运行：

C:\java>java Weather

武胜

小雨

URL url = new URL("http://m.weather.com.cn/data/" + Ctiyid + ".html"); 这里就是中国天气网数据页面，然后我们URLConnection类的openConnection方法得到连接，再通过流的形行将其写到我们的StringBuilder之中。他是一串json的数据格式，所以我们就须要将他转正json，

jsonData = JSONObject.fromObject(datas);

info = jsonData.getJSONObject("info");

这里就是我们转化，然后info.getString("XX").toString(); 得到对应的数据了。

附：你看我们直接输入：http://m.weather.com.cn/data/101270803.html就能看到里的数据