【二】Login filter

/**
 * 登录过滤器
 */
 @WebFilter(filterName="loginFilter",urlPatterns="/*")
 @Slf4j
public class LoginFilter implements Filter {
    
    

    /**
     * 保存不拦截的url
     */
    private static String[] passUrls =ignoreURL.split(",");
 	private String ignoreURL="login,login.do,login.jsp,css,js,javascript,image,images,font,favicon.ico,actuator,/swagger,/v2/api-docs";
    /**
     * 上下文
     */
    private String ctxPath = null;

    /**
     * 重定向url
     */
    private static String redirectUrl = "/login.html";

    /**
     * 过滤器方法
     *
     * @param servletRequest
     * @param servletResponse
     * @param filterChain
     * @throws IOException
     * @throws ServletException
     */
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    
    
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 请求的url
        String url = request.getRequestURI();
        // 相对路径
        String subUrl = url.substring(ctxPath.length() + 1);

        for (String urlStr : passUrls) {
    
    
            // 如果匹配, 则放行
            if (subUrl.indexOf(urlStr) > -1) {
    
    
                filterChain.doFilter(request, response);
                return;
            }
        }

        // 获得session
        HttpSession session = request.getSession();
        // 从session中获取SessionKey对应值,若值不存在,则重定向到redirectUrl
        Object user = session.getAttribute(SmpConst.SESSION_KEY_USERNAME);
        if (user != null) {
    
    
            filterChain.doFilter(request, response);
        } else {
    
    
            response.sendRedirect(ctxPath + "/" + redirectUrl);
        }
    }
}

Start the class to add scan annotations

// 启用@WebServlet/@WebFilter/@WebListener注释类的自动注册
@ServletComponentScan(basePackages="com.dyn.**")