统一资源定位符URL类

package j2se.core.net.base;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;

public class URLDemo {
    public static void main(String[] args) throws IOException {
        URL url = new URL("http://www.google.cn");
        InputStream input = url.openStream();

BufferedReader reader = new BufferedReader(
                new InputStreamReader(input, "UTF-8"));
        while (true) {
            String s = reader.readLine();
            if (s == null)
                break;
            System.out.println(s);
        }
        reader.close();
    }
}