springboot下生成图片验证码并验证

随机图片生成类

package com.yg.sixpre.utils;import javax.imageio.ImageIO;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.util.Random;public class VerifyUtil {    public static final String RANDOMCODEKEY= "RANDOMREDISKEY";//放到session中的key    private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生数字与字母组合的字符串    private int width = 95;// 图片宽    private int height = 25;// 图片高    private int lineSize = 40;// 干扰线数量    private int stringNum = 4;// 随机产生字符数量    private Random random = new Random();    /**     * 获得字体     */    private Font getFont() {        return new Font("Fixedsys", Font.CENTER_BASELINE, 18);    }    /**     * 获得颜色     */    private Color getRandColor(int fc, int bc) {        if (fc > 255)            fc = 255;        if (bc > 255)            bc = 255;        int r = fc + random.nextInt(bc - fc - 16);        int g = fc + random.nextInt(bc - fc - 14);        int b = fc + random.nextInt(bc - fc - 18);        return new Color(r, g, b);    }    /**     * 生成随机图片     */    public void getRandcode(HttpServletRequest request, HttpServletResponse response) {        HttpSession session = request.getSession();        // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);        Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作        g.fillRect(0, 0, width, height);//图片大小        g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));//字体大小        g.setColor(getRandColor(110, 133));//字体颜色        // 绘制干扰线        for (int i = 0; i <= lineSize; i++) {            drowLine(g);        }        // 绘制随机字符        String randomString = "";        for (int i = 1; i <= stringNum; i++) {            randomString = drowString(g, randomString, i);        }        //将生成的随机字符串保存到session中        session.removeAttribute(RANDOMCODEKEY);        session.setAttribute(RANDOMCODEKEY, randomString);        //设置失效时间1分钟        session.setMaxInactiveInterval(60);        g.dispose();        try {            // 将内存中的图片通过流动形式输出到客户端            ImageIO.write(image, "JPEG", response.getOutputStream());        } catch (Exception e) {        }    }    /**     * 绘制字符串     */    private String drowString(Graphics g, String randomString, int i) {        g.setFont(getFont());        g.setColor(new Color(random.nextInt(101), random.nextInt(111), random                .nextInt(121)));        String rand = String.valueOf(getRandomString(random.nextInt(randString                .length())));        randomString += rand;        g.translate(random.nextInt(3), random.nextInt(3));        g.drawString(rand, 13 * i, 16);        return randomString;    }    /**     * 绘制干扰线     */    private void drowLine(Graphics g) {        int x = random.nextInt(width);        int y = random.nextInt(height);        int xl = random.nextInt(13);        int yl = random.nextInt(15);        g.drawLine(x, y, x + xl, y + yl);    }    /**     * 获取随机的字符     */    public String getRandomString(int num) {        return String.valueOf(randString.charAt(num));    }}

controller层使用

@Autowiredprivate RedisService redisService;/** * @author XXXXXX * @date 2018年7月11日 * @desc 图形验证码生成 */@RequestMapping("/createImg")@Log(description="图形验证码生成")public void createImg(HttpServletRequest request, HttpServletResponse response) throws Exception {    try {        response.setContentType("image/jpeg");//设置相应类型,告诉浏览器输出的内容为图片        response.setHeader("Pragma", "No-cache");//设置响应头信息，告诉浏览器不要缓存此内容        response.setHeader("Cache-Control", "no-cache");        response.setDateHeader("Expire", 0);        VerifyUtil randomValidateCode = new VerifyUtil();        randomValidateCode.getRandcode(request, response);//输出验证码图片        //将生成的随机验证码存放到redis中        redisService.setForValue("RANDOMVALIDATECODEKEY",(String)request.getSession().getAttribute("RANDOMREDISKEY"),Long.parseLong("60000")); } catch (Exception e) { logger.error("获取验证码异常：", e); }}

调用后生成效果

原文链接：https://blog.csdn.net/kaola_l/article/details/81003721