SpringBoot添加拦截器

SpringBoot中添加拦截器。

1.继承HandlerInterceptor接口：

public interface HandlerInterceptor {
    
    default boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {

        return true;
    }
    
    default void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            @Nullable ModelAndView modelAndView) throws Exception {
    }
    
    default void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
            @Nullable Exception ex) throws Exception {
    }

}

实现类代码：

public class ApiHandlerInterceptor implements HandlerInterceptor {
    private Logger logger = LoggerFactory.getLogger(this.getClass());
    
    @Override
    public void afterCompletion(HttpServletRequest request,
            HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
    
    @Override
    public void postHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }
    
    @Override
    public boolean preHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler) throws Exception {
        if(logger.isDebugEnabled()) {
            logger.debug("api用户请求拦截[" + request.getRequestURI() + "]");
        }
        String token = request.getParameter("token");
        if(!A.isLogin(token)) {
            if(logger.isDebugEnabled()) {
                logger.debug("api用户未登录");
            }
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/json; charset=utf-8");
            PrintWriter out = null;
            try {
                out = response.getWriter();
                Map<String, Object> resultMap = A.NoLogin();
                out.append(JSONObject.toJSONString(resultMap));
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if(null != out) {
                    out.close();
                }
            }
            return false;
        }
        return HandlerInterceptor.super.preHandle(request, response, handler);
    }

}

2.实现WebMvcConfigurer接口：

@Configuration
public class GlobalWebMvcConfigurer implements WebMvcConfigurer {
    private Logger logger = LoggerFactory.getLogger(this.getClass());
        
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        /**
         * api 端首页和产品详情不用拦截
         */
        registry.addInterceptor(new ApiHandlerInterceptor())
                        .addPathPatterns("/api/**")
                        .excludePathPatterns("/api/open/**");
        
        }
}

addPathPatterns是拦截指定接口，/api/**是拦截所有/api/开头的接口。

excludePathPatterns是不拦截的接口。