Session实战保存验证码

程序员文章站 2022-05-04 14:24:01

创建验证码导入ValidateCode.jar()创建生成验证码的ServletCreateCodeController.javapackage com.newer.servletProject.servlet.controller;import cn.dsna.util.images.ValidateCode;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;i...

创建验证码

导入ValidateCode.jar()

创建生成验证码的Servlet

CreateCodeController.java

package com.newer.servletProject.servlet.controller;

import cn.dsna.util.images.ValidateCode;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet(name = "CreateCodeController",value = "/createCode")
public class CreateCodeController extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //创建验证码图片
        ValidateCode code=new ValidateCode(200,30,4,20);
        String codes=code.getCode();
        //将codes存进session中
        HttpSession session=request.getSession();
        session.setAttribute("codes",codes);
        //验证码图片响应给客户端
        code.write(response.getOutputStream());
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request,response);
    }
}

loginMgr.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>管理员登录</title>
</head>
<body>
    <form action="/day01web1_war_exploded/loginMgr" method="post">
        用户名：<input type="text" name="username"/><br/>
        密码：<input type="password" name="password"/><br/>
        验证码：<input type="text" name="inputVcode"/><img src="/day01web1_war_exploded/createCode"/><br/>
        <input type="submit" value="登录"/>

    </form>
</body>
</html>

LoginMgrController.java

package com.newer.servletProject.servlet.controller;

import com.newer.servletProject.entity.Manager;
import com.newer.servletProject.service.ManagerService;
import com.newer.servletProject.service.impl.ManagerServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet(name = "LoginMgrController",value = "/loginMgr")
public class LoginMgrController extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //1.处理乱码
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=utf-8");

        //2.收参
        String username=request.getParameter("username");
        String password=request.getParameter("password");
        String inputVcode=request.getParameter("inputVcode");

        //从request对象中获取codes
        String codes=(String)request.getSession().getAttribute("codes");
        //判断验证码
        if(!inputVcode.isEmpty()&&inputVcode.equalsIgnoreCase(codes)){
            //3.调用业务方法
            ManagerService managerService=new ManagerServiceImpl();
            Manager mgr=managerService.login(username,password);

            //4.处理结果，流程跳转
            if(mgr!=null){
                //登录成功

                //将管理员信息存储在session中
                HttpSession session=request.getSession();
                session.setAttribute("mgr",mgr);

                //跳转，目标，方式
                response.sendRedirect("/day01web1_war_exploded/showallController");

            }else {
                //登录失败
                response.sendRedirect("/day01web1_war_exploded/loginMgr.html");
            }
        }else {
            response.sendRedirect("/day01web1_war_exploded/loginMgr.html");
        }


    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request,response);
    }
}

本文地址：https://blog.csdn.net/weixin_44364444/article/details/109555726

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