1、Controller层

将验证码放到session中
try {
//设置长宽
VerifyCodeGenUtils verifyCodeGenUtils = new VerifyCodeGenUtils();
VerifyCode verifyCode = verifyCodeGenUtils.generate(80, 36);
String code = verifyCode.getCode();
// 方式一：（session）将VerifyCode绑定session
request.getSession().setAttribute(“verifyCode”, code);

        // 待提交登录时候获取服务器存储的验证码作为比较// String verifyCode1 = (String) request.getSession().getAttribute("VerifyCode");// 方式二：（redis）获取session id 作为key,时间存5分钟// redisUtils.set("VerifyCode_" + request.getSession().getId(), code, 300);//设置响应头response.setHeader("Pragma", "no-cache");//设置响应头response.setHeader("Cache-Control", "no-cache");//在代理服务器端防止缓冲response.setDateHeader("Expires", 0);//设置响应内容类型response.setContentType("image/jpeg");response.getOutputStream().write(verifyCode.getImgBytes());response.getOutputStream().flush();} catch (IOException e) {}

2、配置类 VerifyCodeGenUtils、VerifyCodeRandomUtils

import com.suncere.air.diagnosis.bus.entity.VerifyCode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
public class VerifyCodeGenUtils {

private static final Logger logger = LoggerFactory.getLogger(VerifyCodeGenUtils.class);private static final String[] FONT_TYPES = {"\u5b8b\u4f53", "\u65b0\u5b8b\u4f53", "\u9ed1\u4f53", "\u6977\u4f53", "\u96b6\u4e66"};private static final int VALICATE_CODE_LENGTH = 4;/*** 设置背景颜色及大小，干扰线** @param graphics* @param width* @param height*/
private static void fillBackground(Graphics graphics, int width, int height) {// 填充背景graphics.setColor(Color.WHITE);//设置矩形坐标x y 为0graphics.fillRect(0, 0, width, height);// 加入干扰线条for (int i = 0; i < 8; i++) {//设置随机颜色算法参数graphics.setColor(VerifyCodeRandomUtils.randomColor(40, 150));Random random = new Random();int x = random.nextInt(width);int y = random.nextInt(height);int x1 = random.nextInt(width);int y1 = random.nextInt(height);graphics.drawLine(x, y, x1, y1);}
}/*** 生成随机字符** @param width* @param height* @param os* @return* @throws IOException*/
public String generate(int width, int height, OutputStream os) throws IOException {BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics graphics = image.getGraphics();fillBackground(graphics, width, height);String randomStr = VerifyCodeRandomUtils.randomString(VALICATE_CODE_LENGTH);createCharacter(graphics, randomStr);graphics.dispose();//设置JPEG格式ImageIO.write(image, "JPEG", os);return randomStr;
}/*** 验证码生成** @param width* @param height* @return*/
public VerifyCode generate(int width, int height) {VerifyCode verifyCode = null;try (//将流的初始化放到这里就不需要手动关闭流ByteArrayOutputStream baos = new ByteArrayOutputStream();) {String code = generate(width, height, baos);verifyCode = new VerifyCode();verifyCode.setCode(code);verifyCode.setImgBytes(baos.toByteArray());} catch (IOException e) {logger.error(e.getMessage(), e);verifyCode = null;}return verifyCode;
}/*** 设置字符颜色大小** @param g* @param randomStr*/
private void createCharacter(Graphics g, String randomStr) {char[] charArray = randomStr.toCharArray();for (int i = 0; i < charArray.length; i++) {//设置RGB颜色算法参数g.setColor(new Color(50 + VerifyCodeRandomUtils.nextInt(100),50 + VerifyCodeRandomUtils.nextInt(100), 50 + VerifyCodeRandomUtils.nextInt(100)));//设置字体大小，类型g.setFont(new Font(FONT_TYPES[VerifyCodeRandomUtils.nextInt(FONT_TYPES.length)], Font.BOLD, 26));//设置x y 坐标g.drawString(String.valueOf(charArray[i]), 15 * i + 5, 19 + VerifyCodeRandomUtils.nextInt(8));}
}

}

import org.apache.commons.lang3.RandomUtils;
import java.awt.Color;
import java.util.Random;
public class VerifyCodeRandomUtils extends RandomUtils {
private static final char[] CODE_SEQ = {‘A’, ‘B’, ‘C’, ‘D’, ‘E’, ‘F’, ‘G’, ‘H’, ‘J’,
‘K’, ‘L’, ‘M’, ‘N’, ‘P’, ‘Q’, ‘R’, ‘S’, ‘T’, ‘U’, ‘V’, ‘W’,
‘X’, ‘Y’, ‘Z’, ‘2’, ‘3’, ‘4’, ‘5’, ‘6’, ‘7’, ‘8’, ‘9’};

private static final char[] NUMBER_ARRAY = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};private static Random random = new Random();public static String randomString(int length) {StringBuilder sb = new StringBuilder();for (int i = 0; i < length; i++) {sb.append(String.valueOf(CODE_SEQ[random.nextInt(CODE_SEQ.length)]));}return sb.toString();
}public static String randomNumberString(int length) {StringBuilder sb = new StringBuilder();for (int i = 0; i < length; i++) {sb.append(String.valueOf(NUMBER_ARRAY[random.nextInt(NUMBER_ARRAY.length)]));}return sb.toString();
}public static Color randomColor(int fc, int bc) {int f = fc;int b = bc;Random random = new Random();if (f > 255) {f = 255;}if (b > 255) {b = 255;}return new Color(f + random.nextInt(b - f), f + random.nextInt(b - f), f + random.nextInt(b - f));
}public static int nextInt(int bound) {return random.nextInt(bound);
}

}

3、前端实现

<a-col :span="8"><img :src="verifyUrl" @click="refresh">
</a-col>

4、后端获取

String sessionVerifyCode = (String) request.getSession().getAttribute(“verifyCode”);