这个异常是在登录的时候出现错误时抛出的异常,比如账户锁定,证书失效等,先来看下AuthenticationException常用的的子类:
UsernameNotFoundException 用户找不到
BadCredentialsException 坏的凭据
AccountStatusException 用户状态异常它包含如下子类
AccountExpiredException 账户过期
LockedException账户锁定
DisabledException 账户不可用
CredentialsExpiredException 证书过期
常见的异常就这几个,还有很多不再一一赘述,仅仅为了展示,对后续的阅读没有什么影响
用户登录验证的过滤器是UsernamePasswordAuthenticationFilter,它继承自AbstractAuthenticationProcessingFilter。
今天研究的是看Spring如何处理AuthenticationException这个异常的,异常的处理一般都是doFilter中处理的,所以首先看AbstractAuthenticationProcessingFilter的doFilter中的代码
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public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
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throws IOException, ServletException {
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.......
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try {
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authResult = attemptAuthentication(request, response);
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if (authResult == null) {
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return;
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}
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sessionStrategy.onAuthentication(authResult, request, response);
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} catch(InternalAuthenticationServiceException failed) {
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logger.error("An internal error occurred while trying to authenticate the user.", failed);
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unsuccessfulAuthentication(request, response, failed);
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return;
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}catch (AuthenticationException failed) {
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unsuccessfulAuthentication(request, response, failed);
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return;
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}
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......
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}
从这段代码中我们看到Spring将异常捕获后交给了unsuccessfulAuthentication这个方法来处理(InternalAuthenticationServiceException也是AuthenticationException异常的子类,这是一个内部认证服务异常)
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protected void unsuccessfulAuthentication(HttpServletRequest request, HttpServletResponse response,
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AuthenticationException failed) throws IOException, ServletException {
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SecurityContextHolder.clearContext();
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if (logger.isDebugEnabled()) {
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logger.debug("Authentication request failed: " + failed.toString());
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logger.debug("Updated SecurityContextHolder to contain null Authentication");
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logger.debug("Delegating to authentication failure handler " + failureHandler);
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}
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rememberMeServices.loginFail(request, response);
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failureHandler.onAuthenticationFailure(request, response, failed);
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}
unsuccessfulAuthentication又交给了failureHandler(AuthenticationFailureHandler)来处理,然后追踪failureHandler
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private AuthenticationFailureHandler failureHandler =
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new SimpleUrlAuthenticationFailureHandler();
发现最终是由SimpleUrlAuthenticationFailureHandler这个类的onAuthenticationFailure方法来处理的,打开这个类,有两个核心方法
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public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response,
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AuthenticationException exception) throws IOException, ServletException {
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if (defaultFailureUrl == null) {
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logger.debug("No failure URL set, sending 401 Unauthorized error");
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response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Authentication Failed: " + exception.getMessage());
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} else {
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saveException(request, exception);
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if (forwardToDestination) {
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logger.debug("Forwarding to " + defaultFailureUrl);
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request.getRequestDispatcher(defaultFailureUrl).forward(request, response);
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} else {
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logger.debug("Redirecting to " + defaultFailureUrl);
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redirectStrategy.sendRedirect(request, response, defaultFailureUrl);
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}
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}
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}
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protected final void saveException(HttpServletRequest request, AuthenticationException exception) {
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if (forwardToDestination) {
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request.setAttribute(WebAttributes.AUTHENTICATION_EXCEPTION, exception);
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} else {
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HttpSession session = request.getSession(false);
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if (session != null || allowSessionCreation) {
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request.getSession().setAttribute(WebAttributes.AUTHENTICATION_EXCEPTION, exception);
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}
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}
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}
从onAuthenticationFailure中我们可以看出,如果没有设置defaultFailureUrl就发出401错误。(SC_UNAUTHORIZED是一个常量值是401),如果设置了defaultFailureUrl,调用saveException方法后跳转到defaultFailureUrl页面。
forwardToDestination是是否是服务器跳转,默认使用重定向即客户端跳转。
saveException字面意思是保存异常信息,其实就是把异常信息写入request或者Session中。
如果使用服务器跳转则写入request,客户端跳转则写入Session。
而key是WebAttributes.AUTHENTICATION_EXCEPTION打开WebAttributes找到这个常量
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public final class WebAttributes {
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public static final String ACCESS_DENIED_403 = "SPRING_SECURITY_403_EXCEPTION";
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public static final String AUTHENTICATION_EXCEPTION = "SPRING_SECURITY_LAST_EXCEPTION";
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public static final String WEB_INVOCATION_PRIVILEGE_EVALUATOR_ATTRIBUTE =
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WebAttributes.class.getName() + ".WEB_INVOCATION_PRIVILEGE_EVALUATOR_ATTRIBUTE";
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}
发现其值为SPRING_SECURITY_LAST_EXCEPTION,这样的话我们就可以在页面上通过el表达式来获取到这个异常了
注意:saveException保存的是Session对象所以直接使用 ${SPRING_SECURITY_LAST_EXCEPTION}是获取不到异常信息的,需要使用${SPRING_SECURITY_LAST_EXCEPTION.message}
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原文链接:https://blog.csdn.net/z69183787/article/details/21190639
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