public class MyFilter implements Filter {
	private static final String CURRENT_USER = "current_user";
   //配置白名單
	protected static List<Pattern> patterns = new ArrayList<Pattern>();
	//靜態(tài)代碼塊，在虛擬機(jī)加載類(lèi)的時(shí)候就會(huì)加載執(zhí)行，而且只執(zhí)行一次
	static {
		patterns.add(Pattern.compile("/index"));
		patterns.add(Pattern.compile("/login"));
		patterns.add(Pattern.compile("/register"));
	}
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
	}
	@Override
	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
		HttpServletRequest httpRequest = (HttpServletRequest) servletRequest;
		HttpServletResponse httpResponse = (HttpServletResponse) servletResponse;
		HttpServletResponseWrapper wrapper = new HttpServletResponseWrapper(httpResponse);
		String url = httpRequest.getRequestURI().substring(httpRequest.getContextPath().length());
		if (isInclude(url)) {
			//在白名單中的url,放行訪問(wèn)
			filterChain.doFilter(httpRequest, httpResponse);
			return;
		}
		if (SessionUtils.getSessionAttribute(CURRENT_USER) != null) {
			//若為登錄狀態(tài) 放行訪問(wèn)
			filterChain.doFilter(httpRequest, httpResponse);
			return;
		} else {
			//否則默認(rèn)訪問(wèn)index接口
			wrapper.sendRedirect("/index");
		}
	}
	@Override
	public void destroy() {
	}
//判斷當(dāng)前請(qǐng)求是否在白名單
	private boolean isInclude(String url) {
		for (Pattern pattern : patterns) {
			Matcher matcher = pattern.matcher(url);
			if (matcher.matches()) {
				return true;
			}
		}
		return false;
	}
}

@Configuration
public class WebConfig {
	/**
	 * 配置過(guò)濾器
	 * @return
	 */
	@Bean
	public FilterRegistrationBean someFilterRegistration() {
		FilterRegistrationBean registration = new FilterRegistrationBean();
		registration.setFilter(myFilter());
		//攔截/*的訪問(wèn) 多級(jí)匹配（springboot 過(guò)濾器/*以及匹配 /**多級(jí)匹配）
		registration.addUrlPatterns("/*");
		registration.setName("myFilter");
		return registration;
	}
	/**
	 * 創(chuàng)建一個(gè)bean
	 * @return
	 */
	@Bean(name = "myFilter")
	public Filter myFilter() {
		return new MyFilter();
	}
}

public class LoginFliter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpSession session = request.getSession();
        User user = (User)session.getAttribute("user");
        String uri = request.getRequestURI();
        System.out.println(uri.indexOf("findAll.do"));
        System.out.println(uri.indexOf("login.do"));
        if(user==null && uri.indexOf("login.do")==-1){
            response.sendRedirect(request.getContextPath()+"/");
        }else {
            filterChain.doFilter(request,response);
        }
    }
    @Override
    public void destroy() {
    }
}

   @RequestMapping("/login.do")
    public ModelAndView login(User user, HttpSession session){
        boolean flag = userService.login(user.getName(),user.getPassword());
        ModelAndView modelAndView = new ModelAndView();
        if(flag){
            session.setAttribute("user",user);
            modelAndView.setViewName("../ok");
        }else {
            modelAndView.setViewName("../failure");
        }
        return modelAndView;
    }