spring boot实现验证码登录

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直接看效果:

下面是实现步骤

1.验证码生成工具类(引用自网络)

package com.laoxu.test.helloweb.util;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;

/**
 * @Description: 原始验证码生成工具
 * @Author laoxu
 * @Date 2019/11/2 23:01
 **/
public class VerifyCodeUtil {
    private  int width = 90;// 定义图片的width
    private  int height = 20;// 定义图片的height
    private static int codeCount = 4;// 定义图片上显示验证码的个数
    private static int xx = 15;
    private  int fontHeight = 18;
    private static  int codeY = 16;
    private static char[] codeSequence = { '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', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };



    /**
     * 生成一个map集合
     * code为生成的验证码
     * codePic为生成的验证码BufferedImage对象
     * @return
     */
    public static Map<String,Object> generateCodeAndPic(int width, int height, int fontHeight) {
        // 定义图像buffer
        BufferedImage buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        // Graphics2D gd = buffImg.createGraphics();
        // Graphics2D gd = (Graphics2D) buffImg.getGraphics();
        Graphics gd = buffImg.getGraphics();
        // 创建一个随机数生成器类
        Random random = new Random();
        // 将图像填充为白色
        gd.setColor(Color.WHITE);
        gd.fillRect(0, 0, width, height);

        // 创建字体,字体的大小应该根据图片的高度来定。
        Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
        // 设置字体。
        gd.setFont(font);

        // 画边框。
        gd.setColor(Color.BLACK);
        gd.drawRect(0, 0, width - 1, height - 1);

        // 随机产生40条干扰线,使图象中的认证码不易被其它程序探测到。
        gd.setColor(Color.BLACK);
        for (int i = 0; i < 30; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            gd.drawLine(x, y, x + xl, y + yl);
        }

        // randomCode用于保存随机产生的验证码,以便用户登录后进行验证。
        StringBuffer randomCode = new StringBuffer();
        int red = 0, green = 0, blue = 0;

        // 随机产生codeCount数字的验证码。
        for (int i = 0; i < codeCount; i++) {
            // 得到随机产生的验证码数字。
            String code = String.valueOf(codeSequence[random.nextInt(36)]);
            // 产生随机的颜色分量来构造颜色值,这样输出的每位数字的颜色值都将不同。
            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);

            // 用随机产生的颜色将验证码绘制到图像中。
            gd.setColor(new Color(red, green, blue));
            gd.drawString(code, (i + 1) * xx, codeY);

            // 将产生的四个随机数组合在一起。
            randomCode.append(code);
        }
        Map<String,Object> map  =new HashMap<String,Object>();
        //存放验证码
        map.put("code", randomCode);
        //存放生成的验证码BufferedImage对象
        map.put("codePic", buffImg);
        return map;
    }

    public static void main(String[] args) throws Exception {
        //创建文件输出流对象
        OutputStream out = new FileOutputStream("D://tmp/"+System.currentTimeMillis()+".jpg");
        Map<String,Object> map = VerifyCodeUtil.generateCodeAndPic(90,20,18);
        ImageIO.write((RenderedImage) map.get("codePic"), "jpeg", out);
        System.out.println("验证码的值为:"+map.get("code"));
    }
}

2.写登录页

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>登录页</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
    <link rel="stylesheet" href="css/login.css">
</head>
<body class="text-center">
<form class="form-signin">
    <h1 class="h3 mb-3 font-weight-normal">请登录</h1>
    <label for="username" class="sr-only">用户名:</label>
    <input type="text" id="username" class="form-control" placeholder="" required="required" autofocus="">
    <label for="password" class="sr-only">密码:</label>
    <input type="password" id="password" class="form-control" placeholder="" required="required">
    <div class="verify-div">
        <label for="verify-code" class="sr-only">验证码:</label>
        <input type="text" id="verify-code" style="width: 50%;" class="form-control" placeholder="" required="required">
        <a href="#" οnclick="changeVerifyCode()"><img id="imgObj" alt="验证码" src="/getVerifyCode"></a>
    </div>
    <button class="btn btn-lg btn-primary btn-block" type="submit" id="submit">登录</button>
</form>
</body>
<script type="text/javascript" src="js/jquery-1.11.3.min.js"></script>
<script type="text/javascript">
    $(function() {
        $("#submit").click(function (event) {
            // 阻止表单默认提交
            event.preventDefault();

            var username = $("#username").val(), password = $("#password").val(),verifyCode=$("#verify-code").val();
            if(username==""){
                alert("用户名不能为空!");
                return;
            }
            if(password==""){
                alert("密码不能为空!");
                return;
            }
            if(verifyCode==""){
                alert("验证码不能为空!");
                return;
            }

            // 提交验证
            $.ajax({
                type: "POST",
                url: "/checkLogin",
                data: {
                    "username": username,
                    "password": password,
                    "verifyCode": verifyCode
                },
                success: function (result) {
                    if(result=='success'){
                        window.location.href="http://localhost:8080/success.html";
                    }else{
                        alert(result);
                    }
                }
            });


        });
    });

    function changeVerifyCode() {
        var imgSrc = $("#imgObj");
        var src = imgSrc.attr("src");
        imgSrc.attr("src", chgUrl(src));
    }

    // 时间戳
    // 为了使每次生成图片不一致,即不让浏览器读缓存,所以需要加上时间戳
    function chgUrl(url) {
        var timestamp = (new Date()).valueOf();
        url = url.substring(0, 20);
        if ((url.indexOf("&") >= 0)) {
            url = url + "×tamp=" + timestamp;
        } else {
            url = url + "?timestamp=" + timestamp;
        }
        return url;
    }

</script>
</html>

3.写controller

package com.laoxu.test.helloweb;

import com.laoxu.test.helloweb.util.VerifyCodeUtil;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.RenderedImage;
import java.io.IOException;
import java.util.Map;

/**
 * @Description:
 * @Author laoxu
 * @Date 2019/11/2 13:35
 **/
@Controller
public class LoginController {
    @RequestMapping("/login")
    public String index(){
        return "forward:/login.html";
    }

    @RequestMapping("/getVerifyCode")
    public void getVerifyCode(HttpServletRequest request, HttpServletResponse response){
        // 调用工具类生成的验证码和验证码图片
        Map<String, Object> codeMap = VerifyCodeUtil.generateCodeAndPic(90,20,18);

        // 将四位数字的验证码保存到Session中。
        HttpSession session = request.getSession();
        session.setAttribute("verifyCode", codeMap.get("code").toString().toUpperCase());

        // 禁止图像缓存。
        response.setHeader("Pragma", "no-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", -1);

        response.setContentType("image/jpeg");

        // 将图像输出到Servlet输出流中。
        ServletOutputStream sos;
        try {
            sos = response.getOutputStream();
            ImageIO.write((RenderedImage) codeMap.get("codePic"), "jpeg", sos);
            sos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @ResponseBody
    @RequestMapping("/checkLogin")
    public String checkLogin(@RequestParam String username,
                             @RequestParam String password,
                             @RequestParam String verifyCode,
                             HttpServletRequest request){
        String sessionVerifyCode = (String) request.getSession().getAttribute("verifyCode");

        if(!"admin".equals(username)){
            return "用户名错误!";
        }

        if(!"123".equals(password)){
            return "密码错误!";
        }

        if(!sessionVerifyCode.equals(verifyCode.toUpperCase())){
            return "验证码错误!";
        }

        return "success";
    }
}

需要完整项目的朋友留下邮箱。

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转载自blog.csdn.net/IndexMan/article/details/102888326