获取北京和张北的天气

思路：

根据天气编码url获取2地天气；

运用StringSteamBuffer读取获取内容；

package method;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
/*
功能：获取北京和张北的天气
 */
public class WeatherReport {
        public static void main(String args[]) throws Exception{
            try{
                //由网址创建URL对象
                URL urlBJ = new URL("http://www.weather.com.cn/data/cityinfo/101010100.html");
                URL urlZB = new URL("http://www.weather.com.cn/data/cityinfo/101090303.html");
                //“UTF-8”这是为了防止乱码
                InputStreamReader isReaderBJ =  new InputStreamReader(urlBJ.openStream(),"UTF-8");
                InputStreamReader isReaderZB = new InputStreamReader(urlZB.openStream(),"UTF-8");
                //采用缓冲式读入
                BufferedReader br_BJ = new BufferedReader(isReaderBJ);
                BufferedReader br_ZB = new BufferedReader(isReaderZB);
                String str_BJ;
                String str_ZB;

                System.out.println("北京天气：");
                while((str_BJ = br_BJ.readLine()) != null){
                    System.out.println(str_BJ);//输出
                }

                System.out.println("张北天气：");
                while((str_ZB = br_ZB.readLine())!= null){
                    System.out.println(str_ZB);
                }

                //网上资源使用结束后，数据流及时关闭
                br_BJ.close();
                br_ZB.close();
                isReaderBJ.close();
                isReaderZB.close();
            }
            catch(Exception exp){
                System.out.println(exp);
            }

        }
}