JAVA中三种URL连接方法

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package zzm.java.net;import java.net.URLConnection;import java.net.HttpURLConnection;import java.net.JarURLConnection;import java.net.URL;import java.io.IOException;import java.io.InputStreamReader;import java.io.InputStream;import java.io.BufferedReader;import java.io.InputStreamReader;public class URLConnectionTest {    public static void main(String []args){       try{           /*            *方法一            *                    URL url = new URL("http://www.sina.com.cn");               URLConnection urlcon = url.openConnection();               InputStream is = urlcon.getInputStream();            */           /*            * 方法二            *            *  URL url = new URL("http://www.yhfund.com.cn");               HttpURLConnection urlcon = (HttpURLConnection)url.openConnection();               InputStream is = urlcon.getInputStream();            */           /*            * 方法三            *  URL url = new URL("http://www.yhfund.com.cn");               InputStream is = url.openStream();            */           long begintime = System.currentTimeMillis();           URL url = new URL("http://www.yhfund.com.cn");           HttpURLConnection urlcon = (HttpURLConnection)url.openConnection();           urlcon.connect();         //获取连接           InputStream is = urlcon.getInputStream();           BufferedReader buffer = new BufferedReader(new InputStreamReader(is));           StringBuffer bs = new StringBuffer();           String l = null;           while((l=buffer.readLine())!=null){               bs.append(l).append("/n");           }           System.out.println(bs.toString());           //System.out.println(" content-encode："+urlcon.getContentEncoding());           //System.out.println(" content-length："+urlcon.getContentLength());           //System.out.println(" content-type："+urlcon.getContentType());           //System.out.println(" date："+urlcon.getDate());           System.out.println("总共执行时间为："+(System.currentTimeMillis()-begintime)+"毫秒");        }catch(IOException e){           System.out.println(e);       }    }}

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