Session简单实现验证码登录
2019-05-23 / JAVA / 874 次围观 / 0 次吐槽 /获取验证码
@WebServlet("/ValiDateCodeServlet") public class ValiDateCodeServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //生成验证码图片 ValidateCode code = new ValidateCode(100,30,4,10); //取验证码字符串 String strCode = code.getCode(); //将验证码存Session HttpSession session = req.getSession(); session.setAttribute("code", strCode); //输出验证码 code.write(resp.getOutputStream()); } }
登陆验证
@WebServlet("/LoginServlet") public class LoginServlet extends HttpServlet{ @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("text/html;charset=utf-8"); //获取提交数据和session String username = (String) req.getParameter("username"); String password = (String) req.getParameter("password"); String clientCode = (String) req.getParameter("code"); String serverCode = (String) req.getSession().getAttribute("code"); //比较 if(serverCode != null && clientCode != null) { if(!serverCode.equalsIgnoreCase(clientCode)) { resp.getWriter().write("验证码错误"); }else { if("admin".equals(username) && "123".equals(password)) { resp.getWriter().write("密码正确"); }else { resp.getWriter().write("密码错误"); } } }else{ resp.getWriter().write("空验证码"); } //旧验证码作废 req.getSession().removeAttribute("code"); } }
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