SpringBoot中快速开发一个过滤器Filter

一：写一个类实现Filter接口，重写doFilter方法
　　要注意：如果想从request和response中做一些事情，请进行类型转换

 1 /** 
　　 *使用@WebFilter注解的方式只能根据过滤器名的类名顺序执行，添加@Order注解是无效的，
 * 因为@WebFilter在容器加载时，不会使用@Order注解定义的顺序，而是默认直接使用类名排序
 */
@WebFilter(urlPatterns = {"/service/*"}, filterName = "AAuthFilter")
public class AAuthFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String auth_token = request.getHeader(AUTH_HEAD);
        boolean verification = JWTUtil.verification(auth_token);
        if (!verification) {
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/json; charset=utf-8");
            PrintWriter out = response.getWriter();
            JSONObject res = new JSONObject();
            res.put("msg", "请求被拒绝");
            res.put("success", "false");
            res.put("code", 401);
            out.append(res.toString());
            out.flush();
            return;
        }

        filterChain.doFilter(servletRequest,servletResponse);
    }
}

 二：然后需要在启动类上加上@ServletComponentScan过滤器才会生效

//使过滤器生效
@ServletComponentScan
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }

}