SpringBoot实现验证码登录

一、编写验证码工具类

package com.lyancafe.material.util;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

/**
 * @author scy 2018/9/4
 */
public class VerifyUtil {
    /**验证码字符集*/
    private static final char[] chars = {
            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
            'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
            'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
    /**字符数量*/
    private static final int SIZE = 4;
    /**干扰线数量*/
    private static final int LINES = 5;
    /**宽度*/
    private static final int WIDTH = 80;
    /**高度*/
    private static final int HEIGHT = 40;
    /**字体大小*/
    private static final int FONT_SIZE = 30;

    /**
     * 生成随机验证码及图片
     * Object[0]：验证码字符串；
     * Object[1]：验证码图片。
     */
    public static Object[] createImage() {
        StringBuffer sb = new StringBuffer();
        // 1.创建空白图片
        BufferedImage image = new BufferedImage(
                WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
        // 2.获取图片画笔
        Graphics graphic = image.getGraphics();
        // 3.设置画笔颜色
        graphic.setColor(Color.LIGHT_GRAY);
        // 4.绘制矩形背景
        graphic.fillRect(0, 0, WIDTH, HEIGHT);
        // 5.画随机字符
        Random ran = new Random();
        for (int i = 0; i <SIZE; i++) {
            // 取随机字符索引
            int n = ran.nextInt(chars.length);
            // 设置随机颜色
            graphic.setColor(getRandomColor());
            // 设置字体大小
            graphic.setFont(new Font(
                    null, Font.BOLD + Font.ITALIC, FONT_SIZE));
            // 画字符
            graphic.drawString(
                    chars[n] + "", i * WIDTH / SIZE, HEIGHT*2/3);
            // 记录字符
            sb.append(chars[n]);
        }
        // 6.画干扰线
        for (int i = 0; i < LINES; i++) {
            // 设置随机颜色
            graphic.setColor(getRandomColor());
            // 随机画线
            graphic.drawLine(ran.nextInt(WIDTH), ran.nextInt(HEIGHT),
                    ran.nextInt(WIDTH), ran.nextInt(HEIGHT));
        }
        // 7.返回验证码和图片
        return new Object[]{sb.toString(), image};
    }

    /**
     * 随机取色
     */
    public static Color getRandomColor() {
        Random ran = new Random();
        Color color = new Color(ran.nextInt(256),
                ran.nextInt(256), ran.nextInt(256));
        return color;
    }
}

二、controller层使用

/**
 * 登录
 */
@RequestMapping(value = "login")
@ResponseBody
public Map<Object, Object> login(String userName, String password, UserModel userModel, HttpSession session, HttpServletRequest request) {
    String imageCode = (String) session.getAttribute("imageCode");
    String code = request.getParameter("code");
        userModel = userBo.findByNameAndPassword(userName, password);
        HashMap<Object, Object> result = new HashMap<>(1);
        if(imageCode.equalsIgnoreCase(code)){

            if (userModel != null) {
                result.put("result",true);
            } else {
                result.put("result",false);
            }
        }else{
          result.put("result",false);
        }
        return result;
}

@ApiOperation("生成验证码")
@GetMapping("getCode")
public void getCode(HttpServletResponse response, HttpSession session) throws Exception{
    //利用图片工具生成图片
    //第一个参数是生成的验证码，第二个参数是生成的图片
    Object[] objs = VerifyUtil.createImage();
    //将验证码存入Session
    session.setAttribute("imageCode",objs[0]);

    //将图片输出给浏览器
    BufferedImage image = (BufferedImage) objs[1];
    response.setContentType("image/png");
    OutputStream os = response.getOutputStream();
    ImageIO.write(image, "png", os);
}

三、login.jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">
    <title>用户登录</title>
    <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
    <link rel="stylesheet" type="text/css" href="<%=path%>css/login.css">
    <script src="<%=path%>js/login.js"></script>
    <script type="text/javascript" src="<%=path%>js/jquery.js"></script>
    <script type="text/javascript" src="<%=path%>js/jquery-3.1.1.min.js"></script>
</head>

<body>
<div id="login_frame">
    <h1>用户登录</h1>
    <p id="image_logo"><img src="<%=path%>images/lyancafe.png"></p>
    <form action="<%=basePath%>user/login" name="userForm">
        <p><label class="label_input">用户名</label><input type="text" id="userName" class="text_field" placeholder="请输入账号"></p>
        <p><label class="label_input">密码</label><input type="password" id="password" class="text_field"></p>
        <p><label class="label_input">验证码</label><input type="text" id="code" class="text_field" placeholder="请输入验证码" autocomplete="off"></p>
        <img src="<%=basePath%>user/getCode" alt="更改验证码" onclick="this.src='<%=basePath%>user/getCode?'+(new Date()).getTime();" />
        <div id="login_control">
            <input type="button" id="btn_login" value="登录" onclick="loginUser()">
            <a href="<%=path%>user/index1">
                <input type="button" id="btn_register" value="注册">
            </a>
            <a id="forget_pwd"  href="<%=path%>user/forgetPassword">忘记密码？</a>
        </div>
    </form>
</div>
</body>
</html>

四、login.js

// 表单提交验证

function loginUser() {
    var userName = $('#userName').val();
    var password = $('#password').val();
    var code=$("#code").val();
    if (userName == '') {
        alert('请输入用户名！');
        return false;
    }
    if (password == '') {
        alert('请输入密码！');
        return false;
    }
    if (code == '') {
        alert('请输入验证码！');
        return false;
    }
    $.ajax({
        type: "post",
        url: "user/login",
        data: {
            userName: userName,
            password: password,
            code:code
        },
        dataType: "json",
        success : function(data) {
            console.log(data.result);
            if(data.result){
                alert("登录成功");
                window.location.href="user/getAllUser";
            } else if(data.result.false=0){
                alert("请输入正确的账号和密码");
                window.location.reload();
            }else{
                alert("验证码不正确");
                window.location.reload();
            }
        },
        error : function() {
            alert("出错啦！！！")
        }
    });
}

五、页面展示

样式没有贴出来，可以自己设置，有什么不懂得随时问，如果回复不及时加QQ：501397578 验证码：孙创业