java 使用过滤器实现登录拦截处理

public class MyFilter implements Filter {
	private static final String CURRENT_USER = "current_user";
   //配置白名单
	protected static List<Pattern> patterns = new ArrayList<Pattern>();
	//静态代码块，在虚拟机加载类的时候就会加载执行，而且只执行一次
	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)) {
			//在白名单中的url,放行访问
			filterChain.doFilter(httpRequest, httpResponse);
			return;
		}
		if (SessionUtils.getSessionAttribute(CURRENT_USER) != null) {
			//若为登录状态 放行访问
			filterChain.doFilter(httpRequest, httpResponse);
			return;
		} else {
			//否则默认访问index接口
			wrapper.sendRedirect("/index");
		}
	}
	@Override
	public void destroy() {
	}
//判断当前请求是否在白名单
	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 {
	/**
	 * 配置过滤器
	 * @return
	 */
	@Bean
	public FilterRegistrationBean someFilterRegistration() {
		FilterRegistrationBean registration = new FilterRegistrationBean();
		registration.setFilter(myFilter());
		//拦截/*的访问 多级匹配（springboot 过滤器/*以及匹配 /**多级匹配）
		registration.addUrlPatterns("/*");
		registration.setName("myFilter");
		return registration;
	}
	/**
	 * 创建一个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;
    }