HandlerInterceptor 方式

@Configuration
public class WebSecurityConfig extends WebMvcConfigurationSupport {

    @Qualifier("myHandlerInterceptor")
    private final HandlerInterceptor handlerInterceptor;

    public WebSecurityConfig(HandlerInterceptor myHandlerInterceptor) {
        this.handlerInterceptor = myHandlerInterceptor;
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        InterceptorRegistration addInterceptor = registry.addInterceptor(handlerInterceptor);

        // 排除拦截地址配置
        addInterceptor.excludePathPatterns("/error", "/login**");
        // 拦截配置
        addInterceptor.addPathPatterns("/**");
    }
}
@Component
@Slf4j
public class MyHandlerInterceptor implements HandlerInterceptor {

    /**
     * 在Controller方法调用之前调用.
     * preHandle 方法是进行处理器拦截用的。 当 preHandle 返回 false 时整个请求就结束了
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        log.info("------------请求处理前--------------");
        return true;
    }

    /**
     * 在 Controller 的方法调用之后执行，且在 DispatcherServlet 进行视图的渲染之前执行
     * 前提： postHandle 只会在当前这个 Interceptor 的 preHandle 方法返回true时才执行
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        log.info("------------请求处理中--------------");
    }

    /**
     * 该方法将在整个请求完成之后，也就是 DispatcherServlet 渲染了视图执行
     * 前提： preHandle 方法返回 true
     * afterCompletion 方法的主要的作用: 用于清理资源的
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        log.info("------------请求处理后--------------");
    }
}

 

HandlerInterceptorAdapter 方式

拦截器的实现也可以通过继承​​org.springframework.web.servlet.handler.HandlerInterceptorAdapter​​来实现。

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
    @Bean
    public HandlerInterceptorAdapter handlerInterceptorAdapter() {
        return new AuthorityInterceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(handlerInterceptorAdapter()).addPathPatterns("/**");
    }

}
@Slf4j
@Component
public class AuthorityInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("before...");
        String reqPath = request.getServletPath();

        // 进行业务判断是否需要下一步
        boolean next = checkNext();
        if (!next) {
            response.setStatus(HttpServletResponse.SC_FORBIDDEN);
            response.setContentType("text/json;charset=utf-8");
            Response result = Response.failure("权限不足");
            response.getWriter().write(JSON.toJSONString(result));
            return false;
        }

        return true;
    }
}