Session实现验证码登录

来源：互联网发布：sql forceseek 编辑：程序博客网时间：2024/05/29 09:03
这里写图片描述
<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><form action="/SessionTest/Cservlet" >用户名 ： <input type="text" name="username"/><br>密码 ：  <input type="password" name="password"/><br>验证码 ： <input type="text" name="checkCode" size="4"/><font color="red" >${requestScope.error}</font><br><img  src="/SessionTest/Aservlet"/><br><input type="submit" value="登录"/><br></form></body></html>public class Aservlet extends HttpServlet {    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        //添加响应正文要指定类型        response.setContentType(getServletContext().getMimeType("xxx.jpeg"));        //获得验证码        ValidateCode code=new ValidateCode(150, 40, 4, 2);        //验证码放入session        request.getSession().setAttribute("checkCode", code.getCode());        System.out.print(code.getCode());        //返回验证码输出流        code.write(response.getOutputStream());    }    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        doGet(request, response);    }}@WebServlet("/Cservlet")public class Cservlet extends HttpServlet {    private static final long serialVersionUID = 1L;    /**     * @see HttpServlet#HttpServlet()     */    public Cservlet() {        super();        // TODO Auto-generated constructor stub    }    /**     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)     */    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        System.out.print("cccccccc");        String userCheckCode =  request.getParameter("checkCode");        String checkCode =(String) request.getSession().getAttribute("checkCode");        if (userCheckCode!=null&&userCheckCode.equalsIgnoreCase(checkCode)) {            System.out.print("登录成功");        }else {            request.setAttribute("error", "验证码不正确");            request.getRequestDispatcher("/login.jsp").forward(request, response);;        }    }    /**     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)     */    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        doGet(request, response);    }}
0 0