Servlet = Server + Applet
生命周期编辑
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客户端请求该 servlet；
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加载 servlet 类到内存；
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实例化、初始化该 servlet；
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init() 初始化参数；
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service()（doGet() 或者 doPost()）；
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destroy()。
简单的servlet 例子：
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String name=req.getParameter("name");
String password=req.getParameter("pwd");
String address=req.getRemoteAddr();
String host=req.getRemoteHost();
String user=req.getRemoteUser();
String sessionid=req.getRequestedSessionId();
String protocol=req.getProtocol();
int remotePort=req.getRemotePort();
String address1=req.getLocalAddr();
String host1=req.getLocalName();
Locale user1=req.getLocale();
String servername=req.getServerName();
int protocol1=req.getLocalPort();
//输出到控制台
System.out.print("do get---------name="+name+"&password="+password+"&address="+address+"&host="+host+"&user="+user+"sessionid="+sessionid+"&protocol"+protocol+"&port="+remotePort);
System.out.print("do get---------name="+name+"&password="+password+"&address="+address1+"&host="+host1+"&user="+user1+"sessionid="+servername+"&protocol1="+protocol1);
//
输出到页面
PrintWriter out=resp.getWriter();
out.println("do get---------name="+name+"&password="+password+"&address="+address1+"&host="+host1+"&user="+user1+"sessionid="+servername+"&protocol1="+protocol1);
out.close();
}