Java正则表达式（1）、抓取网页email地址实例

Java正则表达式（一）、抓取网页email地址实例

实现思路：

1、使用java.net.URL对象，绑定网络上某一个网页的地址

2、通过java.net.URL对象的openConnection()方法获得一个HttpConnection对象

3、通过HttpConnection对象的getInputStream()方法获得该网络文件的输入流对象InputStream

4、循环读取流中的每一行数据，并由Pattern对象编译的正则表达式区配每一行字符，取得email地址

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