springboot kaptcha验证码

1. 获取验证码在前端保存

2. 在登录接口把验证码穿给后端做验证

 

下面代码没有提供redis工具类了，SysUser、ApiResult实体

meven kaptcha

<dependency>  
    <groupId>com.github.penggle</groupId>  
    <artifactId>kaptcha</artifactId>  
    <version>2.3.2</version>  
</dependency>

 

登录代码

/**
 * 登录验证
 */
@RestController
@Api(description = "登录")
public class SysLoginController {
    // redids工具类
    @Autowired
    private RedisUtil redisUtil;
    @Autowired
    DefaultKaptcha producer;


    /**
     * 获取验证码
     */
    @ResponseBody
    @GetMapping("/captcha")
    public ApiResult captcha(HttpServletResponse response) throws Exception {
        // 生成文字验证码
        String text = producer.createText();
        // 生成图片验证码
        BufferedImage image = producer.createImage(text);

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ImageIO.write(image, "jpg", outputStream);

        BASE64Encoder encoder = new BASE64Encoder();// 生成captcha的token
        String token = System.currentTimeMillis() + "" + CommonUtils.getStringRandom(19);
        Map<String, Object> map = new HashMap<>();
        map.put("img", "data:image/jpeg;base64," + encoder.encode(outputStream.toByteArray()));
        map.put("token", token);
        //map.put("text", text);
　　
        //保存在redis,设置有效期
        redisUtil.set(RedisKey.USER_LOGIN_CAPTCHA + token, text, 60);
        return ApiResult.success(map);
    }

    /**
     * 登录
     */
    @PostMapping("/login")public ApiResult login(@RequestBody SysUser user, HttpServletRequest request) {
        String tokenCaptcha = request.getHeader("token");
        String captcha = request.getHeader("captcha");
        if (StringUtils.isEmpty(tokenCaptcha)) {
            return ApiResult.error("token不能为空");
        }
        String redisCaptcha = redisUtil.get(RedisKey.USER_LOGIN_CAPTCHA + tokenCaptcha).toString();
        if (StringUtils.notEquals(captcha, redisCaptcha)) {
            return ApiResult.error("验证码错误");
        }

        return ApiResult.success(true);
    }

}