关于servlet
servlet用于处理前端的请求并反应，实现前端与数据库的对接
创建一个类继承HttpServlet类
public class ServletDemo3 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
System.out.println("haha");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
System.out.println("ee");
doGet(req,resp);
}
}
get和post分别是接到请求的两种方法，方法中的request对象和response对象分别用于请求和响应