session应用----登录验证小案例

1 package cn.yzu;
2 import java.io.IOException;
3 import javax.servlet.ServletException;
4 import javax.servlet.http.HttpServlet;
5 import javax.servlet.http.HttpServletRequest;
6 import javax.servlet.http.HttpServletResponse;
7 public class AServlet extends HttpServlet {
8     public void doPost(HttpServletRequest request, HttpServletResponse response)
9             throws ServletException, IOException {
10         String uname=request.getParameter("uname");
11         String verifyCode=request.getParameter("verifyCode");
12         if(uname.equals("fmy")&&verifyCode.equalsIgnoreCase((String) request.getSession().getAttribute("vc")))
13         {
14             request.getSession().setAttribute("uname", uname);
15             response.sendRedirect("suc.jsp");
16         }
17         else
18         {
19             request.setAttribute("msg", "用户名或者验证码错误！");
20             request.getRequestDispatcher("index.jsp").forward(request, response);
21         }
22     }
23 }