应用技术 jQuery druid MySQL Jackson AJAX JSON
话不多说间接上代码
智汇代理申请https://www.kaifx.cn/broker/t...
–JSP页面
<%-- Created by IntelliJ IDEA. User: QiLin Date: 2020/7/28 Time: 13:55 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><html><head> <meta charset="utf-8"/> <meta http-equiv="X-UA-Compatible" content="IE=edge"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>管理员登录</title> <!-- 1. 导入CSS的全局款式 --> <link href="css/bootstrap.min.css" rel="stylesheet"> <!-- 2. jQuery导入，倡议应用1.9以上的版本 --> <script src="js/jquery-2.1.0.min.js"></script> <script src="js/jquery.min.js"></script> <!-- 3. 导入bootstrap的js文件 --> <script src="js/bootstrap.min.js"></script> <script type="text/javascript"> </script></head><body><div class="container" style="width: 400px;"> <h3 style="text-align: center;">管理员登录</h3> <form action="Login" method="post"> <div class="form-group"> <label for="user">用户名：</label> <input type="text" name="user" class="form-control" id="user" placeholder="请输出用户名"/> </div> <div class="form-group"> <label for="password">明码：</label> <input type="password" name="password" class="form-control" id="password" placeholder="请输出明码"/> </div> <div class="form-inline"> <label for="vcode">验证码：</label> <input type="text" name="verifycode" class="form-control" id="verifycode" placeholder="请输出验证码" style="width: 120px;"/> <a href="javascript:refreshCode()"><img src="Check_card" title="看不清点击刷新" id="vcode"/></a> </div> <hr/> <div class="form-group" style="text-align: center;"> <c:if test="${not empty sessionScope.jzmmm}"> 记住明码 <input type="radio" name="cookie" checked value="true"><br> </c:if> <c:if test="${empty sessionScope.jzmmm}"> 记住明码 <input type="radio" name="cookie" value="true"><br> </c:if> <input class="btn btn btn-primary" type="submit" value="登录"> </div> </form> <span id="a"></span> <span id="b"></span> <!-- 出错显示的信息框 --> <c:if test="${not empty sessionScope.msg1 || not empty sessionScope.msg2}"> <div class="alert alert-warning alert-dismissible" role="alert"> <button type="button" class="close" data-dismiss="alert" > <span style="color:red;">${sessionScope.msg1}</span> <span style="color:crimson;">${sessionScope.msg2}</span> </button> <strong>登录失败!</strong> </div> </c:if></div></body></html><script> $(function () { //明码重置为空 $("#user").keydown(function () { $("#password").val(""); }); //刷新验证码 $("#vcode").click(function () { var s= new Date().getTime(); this.src = "Check_card?time="+s; }); //填充明码 $("#user").blur(function () { $.post("GetCookie",{uname:$(this).val()},function (data) { $("#password").val(JSON.parse(data)); } ); }); });</script>Servlet—登录
package web;import service.UserService;import service.impl.UserServiceImpl;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.*;import java.io.IOException;import java.net.URL;import java.net.URLEncoder;/** * @author: QiLin * @date: 2020/8/1 14:32 * @version: 1.0 */@WebServlet( "/Login")public class Login extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); String user = request.getParameter("user"); String pwd = request.getParameter("password"); String code = request.getParameter("verifycode"); String jzmm = request.getParameter("cookie"); String check_card = (String) request.getSession().getAttribute("check_card"); HttpSession session = request.getSession(); if (code.equalsIgnoreCase(check_card)) { UserService userService = new UserServiceImpl(); int login = userService.login(user, pwd); if (login == 1) { if ( jzmm !=null && jzmm.equals("true") ) { String username = URLEncoder.encode(user,"UTF-8"); String userpwd = URLEncoder.encode(user+"pwd","UTF-8"); Cookie name = new Cookie(username,username); Cookie pwdpwd = new Cookie(userpwd,pwd); Cookie jzmmm = new Cookie("jzmm",jzmm); name.setMaxAge(1*60*60); pwdpwd.setMaxAge(1*60*60); jzmmm.setMaxAge(1*60*60); session.setAttribute("username", user); session.setAttribute("password", pwd); response.addCookie(name); response.addCookie(pwdpwd); response.addCookie(jzmmm); request.setAttribute("user",user); request.getRequestDispatcher("index.jsp").forward(request,response); } else { request.setAttribute("user",user); request.getRequestDispatcher("index.jsp").forward(request,response); } } else { session.removeAttribute("msg1"); session.setAttribute("msg2","用户名或明码谬误"); response.sendRedirect("login.jsp"); } } else { session.removeAttribute("msg2"); session.setAttribute("msg1","验证码谬误"); response.sendRedirect("login.jsp"); } } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); }}Servlet—获取明码
package web;import com.fasterxml.jackson.databind.ObjectMapper;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.*;import java.io.IOException;import java.net.URLDecoder;import java.net.URLEncoder;/** * @author: QiLin * @date: 2020/8/2 14:09 * @version: 1.0 */@WebServlet( "/GetCookie")public class GetCookie extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); String user = request.getParameter("uname"); String password = ""; ObjectMapper mapper = new ObjectMapper(); // 获取cookie Cookie[] cookies = request.getCookies(); // 如果为空，则停留在该页面 if(cookies !=null || cookies.length >0) { String username = URLEncoder.encode(user,"UTF-8"); String userpwd = URLEncoder.encode(user+"pwd","UTF-8"); for (int i = 0; i < cookies.length; i++) { if (cookies[i].getName().equals(username)) { user = URLDecoder.decode(cookies[i].getValue(),"UTF-8"); } if (cookies[i].getName().equals(userpwd)) { password = cookies[i].getValue(); } } request.setAttribute("pwd",password); String pwd = mapper.writeValueAsString(request.getAttribute("pwd")); response.getWriter().write(pwd); } } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); }}Servlet—验证码
package web;import javax.imageio.ImageIO;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 java.awt.*;import java.awt.image.BufferedImage;import java.io.IOException;import java.util.Random;/** * @author: QiLin * @date: 2020/8/1 13:52 * @version: 1.0 */@WebServlet( "/Check_card")public class Check_card extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //设置宽高 int width = 100; int height = 50; //创建对象，在内存验证码图 BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR); //丑化图片 Graphics graphics = image.getGraphics(); //画边框 graphics.setColor(Color.magenta); graphics.drawRect(0,0,width-1,height-1); //填充背景色彩 graphics.setColor(Color.cyan);//画笔色彩 graphics.drawRect(0,0,width,height); //定义随机抽取池 String str = "QWERTYUIOPASDFGHJKLZXCVBNMqwertyuioplkjhgfdsazxcvbnm0123456789"; //生成随机角标 Random ran = new Random(); //接管验证码 StringBuffer sb = new StringBuffer(); //写入验证码 for (int i = 1; i <= 4; i++) { int index = ran.nextInt(str.length()); //获取随机字符 char c = str.charAt(index); sb.append(c);// //生成随机x轴// int x = ran.nextInt(width-10) % (width-10-10+1)+10;// //生成随机y轴// int y = ran.nextInt(height-5) % (width-5-5+1)+5; graphics.setFont(new Font("Tahoma", Font.BOLD, 18)); graphics.drawString(c+"",width/5*i,height/2); } //存入session String session_check = sb.toString(); request.getSession().setAttribute("check_card",session_check); //画烦扰线 graphics.setColor(Color.green); for (int i = 0; i < 10; i++) { int x1 = ran.nextInt(width); int x2 = ran.nextInt(width); int y1 = ran.nextInt(height); int y2 = ran.nextInt(height); graphics.drawLine(x1,y1,x2,y2); } //将图片画到页面 ImageIO.write(image,"jpg",response.getOutputStream()); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); }}