springboot中使用springmvc的拦截器-HandlerInterceptorAdapter

springboot中使用springmvc的拦截器-HandlerInterceptorAdapter

拦截器配合注解使用: 权限判断

(1)controller层：
@AuthorityValid(validate=true)
@RequestMapping("/")
public String list(Model model) {
System.out.println(" *** controller *** "+this);
return "index";
}

(2)自定义注解@AuthorityValid
@Documented
@Inherited
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface AuthorityValid {
    boolean validate() default true;
}

(3)拦截器：会拦截带@AuthorityValid注解的方法
public class AuthorityInterceptorAdapter extends HandlerInterceptorAdapter {
    private static final Logger logger = LoggerFactory.getLogger(AuthorityInterceptorAdapter.class);

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        //处理Permission Annotation，实现方法级权限控制
        if (handler.getClass().isAssignableFrom(HandlerMethod.class)) {
            HandlerMethod handlerMethod = (HandlerMethod) handler;
             /*
             * 1、确认当前的controller是否需要进行权限判定，如果需要则进行验证。
             * 2、当controller不需要验证，则验证当前的方法是否需要权限验证，需要则进行验证，不需要则跳出
             * */
            //获取controller注解， controller检查是否需要验证权限控制
            AuthorityValid permission = handlerMethod.getMethod().getDeclaringClass().getAnnotation(AuthorityValid.class);
            if (permission != null && !permission.validate()) { //不需要验证权限
                return super.preHandle(request, response, handler);
            }
             //获取方法注解，方法检查是否需要验证权限控制
            permission = handlerMethod.getMethod().getAnnotation(AuthorityValid.class);
            if (permission != null && !permission.validate()) { //不需要验证权限
            Parameter[] args = handlerMethod.getMethod().getParameters();
            logger.info("参数：{}", args[0]);
            return super.preHandle(request, response, handler);
            }
             // 权限判断,没有权限则跳转至无权限页面，有权限则走正常流程
            logger.info("权限判断...");
        }
        return super.preHandle(request, response, handler);
    }
}

(4)自动配置
@Configuration
public class InterceptorConfig extends WebMvcConfigurerAdapter {
    @Bean
    public AuthorityInterceptorAdapter getValidInterceptor() {
        return new AuthorityInterceptorAdapter();
    }
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        InterceptorRegistration addInterceptor = registry.addInterceptor(getValidInterceptor());
        // 排除配置
        addInterceptor.excludePathPatterns("/error");
        addInterceptor.excludePathPatterns("/login**");
        // 拦截配置
        addInterceptor.addPathPatterns("/**");
    }
}