Spring MVC拦截器的快速应用代码示例

public class MyInterceptor implements HandlerInterceptor {
    /**
     * 1.执行handler之前调用的拦截方法;
     * 2.可以进行编码格式设置、登录保护、权限处理等。
     * @param request 请求对象
     * @param response 响应对象
     * @param handler handler是我们要调用的方法对象
     * @return true放行，false拦截
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("1.preHandle执行");
        return true;
    }

    /**
     * 1.当handler方法执行完成后，触发的方法，没有拦截机制了。
     * 2.此方法只有 preHandle中 return true时才会触发
     * 3.对结果进行处理，比如敏感词检查。
     * @param request 请求
     * @param response 响应
     * @param handler handler方法
     * @param modelAndView 返回的视图和模型数据
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("2.postHandle执行");
    }

    /**
     * 整体处理完毕，调用此方法
     * @param request 请求
     * @param response 响应
     * @param handler handler方法
     * @param ex 异常对象
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("3.afterCompletion执行");
    }
}

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //1.拦截所有请求
        registry.addInterceptor(new MyInterceptor())
                .addPathPatterns("/**");
    }
}

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //1.拦截所有请求 
        registry.addInterceptor(new MyInterceptor()).addPathPatterns("/v1/**");
    }
}

registry.addInterceptor(new MyInterceptor()) .addPathPatterns("/**");

registry.addInterceptor(new MyInterceptor()) .addPathPatterns("/v1/user/**");

registry
.addInterceptor(new MyInterceptor()) 
.addPathPatterns("/v1/user/**")
.excludePathPatterns("/v1/user/login");

public class TimeAccessInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, 
HttpServletResponse response, Object handler) throws Exception {
        System.out.println("进入访问时间限定拦截器");
        LocalTime now = LocalTime.now();//JDK中的时间对象
        int hour = now.getHour();//获取当前时间对应小时
        if (hour<6 || hour>22){
            throw new RuntimeException("请在06:00~22:00之间进行访问");
        }
        return true;
    }
}

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new TimeAccessInterceptor())
                .addPathPatterns("/v1/user/**");
    }
}

@Slf4j
@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response, Object handler) throws Exception {
        //从 header 中获取 token
        String jwtToken = request.getHeader("user_token");
        log.info("获取路径:{}", request.getRequestURI());
        log.info("从header中获取token:{}", jwtToken);
        //验证用户 token
        Claims claims = JWTUtil.parseJWT(jwtToken);
        if (null == claims){
            response.setStatus(401);
            return false;
        }
        log.info("令牌验证通过, 放行");
        return true;
    }
}

@Configuration
public class AppConfig implements WebMvcConfigurer {

    @Autowired
    private LoginInterceptor loginInterceptor;

    private final List<String> excludes = Arrays.asList(
            "/**/*.html",
            "/css/**",
            "/js/**",
            "/pic/**",
            "/*.jpg",
            "/favicon.ico",
            "/**/login",
            "/register",
            "/verification-code/send",
            "/winning-records/show"
    );

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

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new RateLimitInterceptor())
                           .addPathPatterns("/v1/user/**");
    }
}