SpringBoot中图形验证码的生成和校验

1.编写工具类

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;
public class RandomValidateCodeUtil {
    public static final String RANDOMCODEKEY= "MEISHANG-LOGIN-RANDOMVALIDATECODEKEY";//放到session中的key
    //private String randString = "0123456789";//随机产生只有数字和字母的字符串 private String
    //private String randString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生只有字母的字符串
    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 static final Logger logger = LoggerFactory.getLogger(RandomValidateCodeUtil.class);
    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);
        }
        logger.info(randomString);
        //将生成的随机字符串保存到session中
        session.removeAttribute(RANDOMCODEKEY);
        session.setAttribute(RANDOMCODEKEY, randomString);
        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) {
            logger.error("将内存中的图片通过流动形式输出到客户端失败>>>>   ", 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));
    }
}

2. 编写控制层类

import com.shenghua.www.msmall.util.RandomValidateCodeUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
 *  @title VerifycodeController
 *  @Description 生成图形验证码  和  验证图像验证码的方法
 *  @author byr
 *  @Date 
 */
@RestController
@RequestMapping("/verifycode")
public class VerifyCodeController {
    private final static Logger logger = LoggerFactory.getLogger(VerifyCodeController.class);

    /**
     * @description 生成验证码
     * @param :
     * @return: null
     * @author baiyurong
     * @date 2020/8/26 10:34
     */
    @RequestMapping(value = "/getverify")
    public void getVerify(HttpServletRequest request, HttpServletResponse response) {
        try {
            //设置相应类型,告诉浏览器输出的内容为图片
            response.setContentType("image/jpeg");
            //设置响应头信息，告诉浏览器不要缓存此内容
            response.setHeader("Pragma", "No-cache");
            response.setHeader("Cache-Control", "no-cache");
            response.setDateHeader("Expire", 0);
            RandomValidateCodeUtil randomValidateCode = new RandomValidateCodeUtil();
            //输出验证码图片方法
            randomValidateCode.getRandcode(request, response);
        } catch (Exception e) {
            logger.error("获取验证码失败>>>>   ", e);
        }
    }

    /**
     * @description 校验验证码
     * @param :
     * @return: null
     * @author byr
     * @date 
     */
    @PostMapping("/checkverify")
    public boolean checkVerify(@RequestParam String verifyInput, HttpSession session) {
        try{
            //从session中获取随机数
            String inputStr = verifyInput;
                String random = (String) session.getAttribute("MEISHANG-LOGIN-RANDOMVALIDATECODEKEY");
            if (random == null) {
                return false;
            }
            if (random.equalsIgnoreCase(inputStr)) {
                return true;
            } else {
                return false;
            }
        }catch (Exception e){
            logger.error("验证码校验失败", e);
            return false;
        }
    }
}