SpringBoot进阶教程(八十二)Spring Security图形验证码

/**
 * @Author chen bo
 * @Date 2023/12
 * @Des
 */
@RestController
public class ImageController {
    public final static String SESSION_KEY_IMAGE_CODE = "SESSION_VERIFICATION_CODE";

    private SessionStrategy sessionStrategy = new HttpSessionSessionStrategy();

    @GetMapping("/code/image")
    public void createCode(HttpServletRequest request, HttpServletResponse response) throws IOException {
        ImageCode imageCode = createImageCode();
        sessionStrategy.setAttribute(new ServletWebRequest(request), SESSION_KEY_IMAGE_CODE, imageCode);
        ImageIO.write(imageCode.getImage(), "jpeg", response.getOutputStream());
    }

    private ImageCode createImageCode() {
        // 验证码图片宽度
        int width = 100;
        // 验证码图片长度
        int height = 36;
        // 验证码位数
        int length = 4;
        // 验证码有效时间 60s
        int expireIn = 60;

        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        Graphics graphics = image.getGraphics();

        Random random = new Random();

        graphics.setColor(getRandColor(200, 500));
        graphics.fillRect(0, 0, width, height);
        graphics.setFont(new Font("Times New Roman", Font.ITALIC, 20));
        graphics.setColor(getRandColor(160, 200));
        for (int i = 0; i < 155; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            graphics.drawLine(x, y, x + xl, y + yl);
        }
        StringBuilder sRand = new StringBuilder();
        for (int i = 0; i < length; i++) {
            String rand = String.valueOf(random.nextInt(10));
            sRand.append(rand);
            graphics.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
            graphics.drawString(rand, 13 * i + 6, 16);
        }

        graphics.dispose();

        return new ImageCode(image, sRand.toString(), expireIn);
    }

    private Color getRandColor(int fc, int bc) {
        Random random = new Random();
        if (fc > 255)
            fc = 255;

        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }
}

        <span style="display: inline">
            <input type="text" name="请输入验证码" placeholder="验证码" required="required"/>
            <img src="/code/image"/>
        </span>

/**
 * @Author chen bo
 * @Date 2023/12
 * @Des
 */
public class ValidateCodeException extends AuthenticationException {

    private static final long serialVersionUID = 1715361291615299823L;

    public ValidateCodeException(String explanation) {
        super(explanation);
    }
}

/**
 * @Author chen bo
 * @Date 2023/12
 * @Des
 */
@Component
public class ValidateCodeFilter extends OncePerRequestFilter {

    @Autowired
    private MyAuthenticationFailureHandler myAuthenticationFailureHandler;

    private SessionStrategy sessionStrategy = new HttpSessionSessionStrategy();

    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        if ("/login".equalsIgnoreCase(httpServletRequest.getRequestURI())
                && "post".equalsIgnoreCase(httpServletRequest.getMethod())) {
            try {
                validateCode(new ServletWebRequest(httpServletRequest));
            } catch (ValidateCodeException e) {
                myAuthenticationFailureHandler.onAuthenticationFailure(httpServletRequest, httpServletResponse, e);
                return;
            }
        }
        filterChain.doFilter(httpServletRequest, httpServletResponse);
    }

    private void validateCode(ServletWebRequest servletWebRequest) throws ServletRequestBindingException, ValidateCodeException {
        ImageCode codeInSession = (ImageCode) sessionStrategy.getAttribute(servletWebRequest, ImageController.SESSION_KEY_IMAGE_CODE);
        String codeInRequest = ServletRequestUtils.getStringParameter(servletWebRequest.getRequest(), "imageCode");

        if (StringUtils.isEmpty(codeInRequest)) {
            throw new ValidateCodeException("验证码不能为空！");
        }
        if (codeInSession == null) {
            throw new ValidateCodeException("验证码不存在！");
        }
        if (codeInSession.isExpire()) {
            sessionStrategy.removeAttribute(servletWebRequest, ImageController.SESSION_KEY_IMAGE_CODE);
            throw new ValidateCodeException("验证码已过期！");
        }
        if (!codeInRequest.equalsIgnoreCase(codeInSession.getCode())) {
            throw new ValidateCodeException("验证码不正确！");
        }

        sessionStrategy.removeAttribute(servletWebRequest, ImageController.SESSION_KEY_IMAGE_CODE);
    }
}

/**
 * @Author chen bo
 * @Date 2023/12
 * @Des
 */
@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.addFilterBefore(new ValidateCodeFilter(), UsernamePasswordAuthenticationFilter.class) //添加验证码效验过滤器
                .formLogin() // 表单登录
                .loginPage("/login.html")       // 登录跳转url
//                .loginPage("/authentication/require")
                .loginProcessingUrl("/login")   // 处理表单登录url
//                .successHandler(authenticationSuccessHandler)
                .failureHandler(new MyAuthenticationFailureHandler())
                .and()
                .authorizeRequests()            // 授权配置
                .antMatchers("/login.html", "/css/**", "/authentication/require", "/code/image").permitAll()  // 无需认证
                .anyRequest()                   // 所有请求
                .authenticated()                // 都需要认证
                .and().csrf().disable();

    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
}