一：新建一个IpRequestOriginParser类，实现RequestOriginParser接口，配置如下

public class IpRequestOriginParser implements RequestOriginParser {
    /**
     * Parse the origin from given HTTP request.
     *
     * @param request HTTP request
     * @return parsed origin
     */
    @Override
    public String parseOrigin(HttpServletRequest request) {
        return request.getRemoteAddr();
    }
}

二：新建一个SentinelConfig类，配置如下

@Configuration
public class SentinelConfig {

    @PostConstruct
    public void init() {
        WebCallbackManager.setUrlBlockHandler(new DemoUrlBlockHandler());
        WebCallbackManager.setRequestOriginParser(new IpRequestOriginParser());
    }
}

三：新建一个DemoUrlBlockHandler类，实现UrlBlockHandler接口，配置如下

public class DemoUrlBlockHandler implements UrlBlockHandler {
 @Override
 public void blocked(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, BlockException e) throws IOException {
 httpServletResponse.getWriter().println(“error url”);
 }
 }

四：访问一次/white接口，sentinel控制台就会出现地址了，是懒加载的

五：点击授权规则，新增授权规则，输入路径，点击白名单

六：在浏览器访问/white接口，可以看到有返回值

七：修改授权类型为黑名单，在次访问接口，可以看到报错