Java网络编程

haouziwefe

[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 />  <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 = "http://www.baidu.com"; <br />String urlString2 = "http://www.google.com.cn"; <br />String urlString3 = "http://android.developers.com"; <br />String urlString4 = "http://www.sina.com"; <br />URL url =  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("protocol: " + protocol + "\n" + "host: " + host); <br />System.out.println("port: " + port + "\n" + "file: " + file); <br /><br />URLConnection urlConn = url.openConnection(); <br />InputStream is = urlConn.getInputStream(); <br />OutputStream os = new FileOutputStream("d:/android.html"); <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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