Knife4j是一个集Swagger2 和 OpenAPI3为一体的增强解决方案，官网地址：Knife4j · 集Swagger2及OpenAPI3为一体的增强解决方案. | Knife4j

考虑到安全性问题，在实际服务部署到生产环境后就需要禁用到swagger页面的展示，这个时候只需要进行如下配置即可实现该功能：

knife4j:
  production: true

 是的，通过设置knife4j.production为true就意味着在生产环境下，这个时候就无法打开swagger对应页面，当你输入http://localhost:8081/doc.html页面会返回如下错误信息：

 下面简单看下knife4j是如何实现该功能的，找到Knife4jAutoConfiguration这个类，看如下的Bean创建即可

    // knife4j.productio为true时创建ProductionSecurityFilter对象
    @Bean
    @ConditionalOnMissingBean(ProductionSecurityFilter.class)
    @ConditionalOnProperty(name = "knife4j.production", havingValue = "true")
    public ProductionSecurityFilter productionSecurityFilter(Knife4jProperties knife4jProperties) {
        boolean prod = false;
        ProductionSecurityFilter p = null;
        if (knife4jProperties == null) {
            if (environment != null) {
                String prodStr = environment.getProperty("knife4j.production");
                if (logger.isDebugEnabled()) {
                    logger.debug("swagger.production:{}", prodStr);
                }
                prod = Boolean.valueOf(prodStr);
            }
            p = new ProductionSecurityFilter(prod);
        } else {
            p = new ProductionSecurityFilter(knife4jProperties.isProduction());
        }
        
        return p;
    }
    

ProductionSecurityFilter类如其名，该类是一个Filter实现类，所以看下这个类的doFilter方法实现

    
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        if (production) {
            String uri = httpServletRequest.getRequestURI();
            // 判断uri是否是要被拦截的地址，被拦截地址有如下几个：
            // 
     /*
    public BasicFilter() {
        urlFilters = new ArrayList<>();
        urlFilters.add(Pattern.compile(".*?/doc\\.html.*", Pattern.CASE_INSENSITIVE));
        urlFilters.add(Pattern.compile(".*?/v2/api-docs.*", Pattern.CASE_INSENSITIVE));
        urlFilters.add(Pattern.compile(".*?/v2/api-docs-ext.*", Pattern.CASE_INSENSITIVE));
        urlFilters.add(Pattern.compile(".*?/swagger-resources.*", Pattern.CASE_INSENSITIVE));
        urlFilters.add(Pattern.compile(".*?/swagger-resources/configuration/ui.*", Pattern.CASE_INSENSITIVE));
        urlFilters.add(Pattern.compile(".*?/swagger-resources/configuration/security.*", Pattern.CASE_INSENSITIVE));
        // https://gitee.com/xiaoym/knife4j/issues/I6H8BE
        urlFilters.add(Pattern.compile(".*?/swagger-ui.*", Pattern.CASE_INSENSITIVE));
        urlFilters.add(Pattern.compile(".*?/v3/api-docs.*", Pattern.CASE_INSENSITIVE));
    }*/
            if (!match(uri)) {
                chain.doFilter(request, response);
            } else {
                response.setContentType("text/palin;charset=UTF-8");
                PrintWriter pw = response.getWriter();
                // 下面信息就是页面展示的无权访问信息
                pw.write("You do not have permission to access this page");
                pw.flush();
            }
        } else {
            chain.doFilter(request, response);
        }
    }