Java网络编程

    [img][/img]<ol> <li>Java网络编程： </li>?java网络编程用的包java.net <br />java.net.URL，我们可以使用这个类来创建一个网络编程要用的URL对象。 <br />全部构造方法： <br />&nbsp; <br /><img src="http://dl.iteye.com/upload/attachment/507945/05960599-8bcd-359f-b009-83f374dc75a5.gif" /> <br /> <br /> <br />?为了获得URL的实际比特或内容信息，使用URL类中的openConnection方法得到一个URLConnection对象，这个对象与URL相关，并且会引发IOException异常。 <br /> <br />实验代码： <br />package com.laili.netUrl; <br /> <br />import java.io.FileOutputStream; <br />import java.io.InputStream; <br />import java.io.OutputStream; <br />import java.net.URL; <br />import java.net.URLConnection; <br /> <br />public class TestUrl <br />{ <br />public static void main(String[] args) throws Exception <br />{ <br />String urlString = &amp;quot;http://www.baidu.com&amp;quot;; <br />String urlString2 = &amp;quot;http://www.google.com.cn&amp;quot;; <br />String urlString3 = &amp;quot;http://android.developers.com&amp;quot;; <br />String urlString4 = &amp;quot;http://www.sina.com&amp;quot;; <br />URL url =&nbsp; new URL(urlString4); <br /> <br />String protocol = url.getProtocol(); <br />String host = url.getHost(); <br />int port = url.getPort(); <br />String file = url.getFile(); <br />System.out.println(&amp;quot;protocol: &amp;quot; + protocol + &amp;quot;\n&amp;quot; + &amp;quot;host: &amp;quot; + host); <br />System.out.println(&amp;quot;port: &amp;quot; + port + &amp;quot;\n&amp;quot; + &amp;quot;file: &amp;quot; + file); <br /> <br />URLConnection urlConn = url.openConnection(); <br />InputStream is = urlConn.getInputStream(); <br />OutputStream os = new FileOutputStream(&amp;quot;d:/android.html&amp;quot;); <br /> <br />byte[] buffer = new byte[1024]; <br />int len; <br />while((len = is.read(buffer, 0, buffer.length)) != -1) <br />{ <br />os.write(buffer, 0, len); <br />} <br /> <br />is.close(); <br />os.close(); <br />} <br />} <br /> <br /></ol> <br />
 
   
     
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