前文说当http://192.168.19.206:6001/authentication/loginPage路径登录后没有成功后的转跳地址 所以会报错 以下代码可以解决

解决方案

在登录成功后 前文我们配置CustomAuthenticationSuccessHandler  返回json 这个类调用了onAuthenticationSuccess 那就重写onAuthenticationSuccess方法

@Component("customAuthenticationSuccessHandler")
public class CustomAuthenticationSuccessHandler extends CustomSavedRequestAwareAuthenticationSuccessHandler {

    @Autowired
    Utils utils;

    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
        Authentication authentication) throws IOException, ServletException {
        SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        SysUser sysUser = (SysUser)authentication.getPrincipal();
        logger.info("|" + "用户" + sysUser.getUsername() + "于" + sd.format(new Date()) + "通过web端登录系统，ip为"
            + utils.getIpAddr() + "。" + "|" + sd.format(new Date()) + "|" + sysUser.getUsername());
        super.onAuthenticationSuccess(request, response, authentication);
    }
}

重写onAuthenticationSuccess  大致意思就是 在登录成功后获取转跳地址 如果没有 我们指定给他一个固定地址 这里我们指定了百度

public class CustomSavedRequestAwareAuthenticationSuccessHandler extends SimpleUrlAuthenticationSuccessHandler {

    protected final Log logger = LogFactory.getLog(this.getClass());
    private RequestCache requestCache = new HttpSessionRequestCache();

    public CustomSavedRequestAwareAuthenticationSuccessHandler() {}

    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
        Authentication authentication) throws ServletException, IOException {
        // 获取code码路径 现在有两种判断
        // 1.如果查询缓存有 定向到缓存 也就是数据库配置
        // 2.如果前台已经登录 但是退回导致session丢失 跳转可道云页面
        String targetUrl;
        // 获取缓存
        SavedRequest savedRequest = this.requestCache.getRequest(request, response);
        if (savedRequest == null) {
            // 跳转可道云
            targetUrl = "https://www.baidu.com";
        } else {
            // 跳转缓存
            targetUrl = savedRequest.getRedirectUrl();
        }
        String targetUrlParameter = this.getTargetUrlParameter();
        if (!this.isAlwaysUseDefaultTargetUrl()
            && (targetUrlParameter == null || !StringUtils.hasText(request.getParameter(targetUrlParameter)))) {
            this.clearAuthenticationAttributes(request);
            this.logger.debug("Redirecting to DefaultSavedRequest Url: " + targetUrl);
            this.getRedirectStrategy().sendRedirect(request, response, targetUrl);
        } else {
            this.requestCache.removeRequest(request, response);
            super.onAuthenticationSuccess(request, response, authentication);
        }
    }

    public void setRequestCache(RequestCache requestCache) {
        this.requestCache = requestCache;
    }
}