Spring Security(六):实现图形验证码登录

前面五篇文章学习了最简单的一些登录认证流程,以及整个认证流程的源码走读,这篇文章就来看看如何实现图形验证码的登录。

开发生成验证码接口

获取验证码图片接口

  • 根据随机数生成图片(生成验证码图片的代码网上很多,这里不再贴出)
  • 将随机数存到Session中
  • 将生成的图片写到接口的响应中
	@GetMapping("/code/image")
	public void createCode(HttpServletRequest request, HttpServletResponse response) throws Exception {
    
    
		// 生成图片
		ImageCode imageCode = createCodeImageCode(request);
		// 保存到session
		sessionStrategy.setAttribute(new ServletWebRequest(request), SESSION_KEY, imageCode);
		// 显示给前端
		ImageIO.write(imageCode.getImage(), "JPEG", response.getOutputStream());
	}
  • 该接口需要配置不被拦截
	@Override
	protected void configure(HttpSecurity http) throws Exception {
    
    
		http.formLogin()
				.loginPage("/authentication/require")
				.loginProcessingUrl("/authentication/form")
				.successHandler(meicloudAuthenticationSuccessHandler)
				.failureHandler(meicloudAuthenticationFailureHandler)
				.and()
				.authorizeRequests()
				.antMatchers("/authentication/require",
						securityProperties.getBrowser().getSignInPage(),
						// 配置 “/code/image” 不被拦截
						"/code/image").permitAll()
				.anyRequest()
				.authenticated()
				.and()
				.csrf().disable();
	}

前端页面

  • 前端需要传给后台 imageCode ,后台获取到后和 Session 中保存的验证码进行验证。
  • 页面代码:
	<form action="/authentication/form" method="post">
		<table>
			<tr>
				<td>用户名:</td> 
				<td><input type="text" name="username"></td>
			</tr>
			<tr>
				<td>密码:</td>
				<td><input type="password" name="password"></td>
			</tr>
			<tr>
				<td>图形验证码:</td>
				<td>
					<input type="text" name="imageCode">
					<img src="/code/image?width=200">
				</td>
			</tr>
			<tr>
				<td colspan="2"><button type="submit">登录</button></td>
			</tr>
		</table>
	</form>

在认证流程中加入图形验证码校验

校验逻辑

  • 首先后台需要自己定义一个过滤器来处理校验验证码的请求,验证通过之后继续调用后续过滤器UserNamePasswordAuthenticationFilter,如果验证不通过就抛异常返回错误信息。
public class ValidateCodeFilter extends OncePerRequestFilter {
    
    
	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
			throws ServletException, IOException {
    
    

		ValidateCodeType type = getValidateCodeType(request);
		if (type != null) {
    
    
			logger.info("校验请求(" + request.getRequestURI() + ")中的验证码,验证码类型" + type);
			try {
    
    
				// 进行验证码的校验
				validateCodeProcessorHolder.findValidateCodeProcessor(type)
						.validate(new ServletWebRequest(request, response));
				logger.info("验证码校验通过");
			} catch (ValidateCodeException exception) {
    
    
				// 如果校验抛出异常,则交给我们之前文章定义的异常处理器进行处理
				authenticationFailureHandler.onAuthenticationFailure(request, response, exception);
				return;
			}
		}
		// 继续调用后边的过滤器
		chain.doFilter(request, response);
	}
}
  • 校验的方法
	@SuppressWarnings("unchecked")
	@Override
	public void validate(ServletWebRequest request) {
    
    

		// 获取session中的imageCode
		ImageCode codeInSession = (ImageCode) sessionStrategy.getAttribute(request, ValidateCodeController.SESSION_KEY);

		String codeInRequest;
		try {
    
    
			// 获取前端传过来的imageCode
			codeInRequest = ServletRequestUtils.getStringParameter(request.getRequest(),
					"imageCode");
		} catch (ServletRequestBindingException e) {
    
    
			throw new ValidateCodeException("获取验证码的值失败");
		}
		if (StringUtils.isBlank(codeInRequest)) {
    
    
			throw new ValidateCodeException(codeType + "验证码的值不能为空");
		}
		if (codeInSession == null) {
    
    
			throw new ValidateCodeException(codeType + "验证码不存在");
		}
		if (codeInSession.isExpried()) {
    
    
			validateCodeRepository.remove(request, codeType);
			throw new ValidateCodeException(codeType + "验证码已过期");
		}
		if (!StringUtils.equals(codeInSession.getCode(), codeInRequest)) {
    
    
			throw new ValidateCodeException(codeType + "验证码不匹配");
		}
		// 校验完之后记得将其移除
		sessionStrategy.removeAttribute(request, ValidateCodeController.SESSION_KEY);
	}
  • 将自己定义的校验验证码的过滤器加到UserNamePasswordAuthenticationFilter之前
	@Override
	protected void configure(HttpSecurity http) throws Exception {
    
    
		// 验证码校验过滤器
		ValidateCodeFilter validateCodeFilter = new ValidateCodeFilter();
		// 将验证码校验过滤器加到 UsernamePasswordAuthenticationFilter 过滤器之前
		http.addFilterBefore(validateCodeFilter, UsernamePasswordAuthenticationFilter.class)
				.formLogin()
				.loginPage("/authentication/require")
				.loginProcessingUrl("/authentication/form")
				.successHandler(meicloudAuthenticationSuccessHandler)
				.failureHandler(meicloudAuthenticationFailureHandler)
				.and()
				.authorizeRequests()
				.antMatchers("/authentication/require",
						securityProperties.getBrowser().getSignInPage(),
						"/code/image").permitAll()
				.anyRequest()
				.authenticated()
				.and()
				.csrf().disable();
	}

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转载自blog.csdn.net/qq_36221788/article/details/106066109
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