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1、客户端发出请求；
 
2、DispatcherServlet 获取请求；
 
3、DispatcherServlet 查询 HandlerMapping，将请求的URL映射到一个控制器对象Controller，
     并将请求分发给这个 Controller；
 
4、Controller 根据设计的业务逻辑处理请求；
 
5、完成业务逻辑的处理后，Controller 返回一个ModelAndView 给 DispatcherServlet ；

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Pattern p = Pattern.compile("@\\w+\\s");

String str = "@tom @jerry @rose 这是我的电子邮件，给我发邮件哦[email protected]";

Matcher m = p.matcher(str);

while(m.find()) {
    System.out.println(m.group());
}

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        URL url = new URL("http://www.baidu.com");
  			
	URLConnection conn =url.openConnection();
	InputStream stream = conn.getInputStream();
	//字符流
	BufferedReader reader = new BufferedReader(new InputStreamReader(stream,"UTF-8"));
	String str = null;
	StringBuffer sb = new StringBuffer();
	while((str=reader.readLine())!=null){
		sb.append(str);

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  	URL url = new URL("http://www.kaishengit.com/images/2013.jpg");
			
	URLConnection conn =url.openConnection();
	InputStream stream = conn.getInputStream();
	
	File file = new File("F:/tupian.jpg");
	OutputStream out = new FileOutputStream(file);
	 
	BufferedInputStream bis = new BufferedInputStream(stream);
	BufferedOutputStream bos = new BufferedOutputStream(out);