springCloud之zuul路由网关

客官°小女子只卖身不卖艺 2022-04-25 08:04 335阅读 0赞

Zuul的主要功能是路由转发和过滤器，路由功能是微服务的一部分，比如/api/user转发到user服务，/api/shop转发到shop服务。zuul默认和ribbon结合实现了负载均衡的功能。  
核心代码和配置如下：

eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/
    server:
      port: 8769
    spring:
      application:
        name: service-zuul
    
    #    zuul起到了路由的作用，以/api-a/ 开头的请求都转发给service-ribbon服务；
    #     以/api-b/开头的请求都转发给service-feign服务
    zuul:
      routes:
        api-a:
          path: /api-a/**
          serviceId: service-ribbon
        api-b:
          path: /api-b/**
          serviceId: service-feign

/**
     *  路由网关(zuul)
     *  注解@EnableZuulProxy，开启zuul的功能
     */
    @EnableZuulProxy
    @EnableEurekaClient
    @SpringBootApplication
    public class ServiceZuulApplication {
        public static void main(String[] args) {
            SpringApplication.run(ServiceZuulApplication.class, args);
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RocXR6cQ_size_16_color_FFFFFF_t_70]  
zuul不仅只是路由，并且还能过滤，做一些安全验证。

package com.dalingjia.servicezuul;
    
    import com.netflix.zuul.ZuulFilter;
    import com.netflix.zuul.context.RequestContext;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.stereotype.Component;
    
    import javax.servlet.http.HttpServletRequest;
    
    /**
     * zuul不仅只是路由，并且还能过滤，做一些安全验证
     */
    @Component
    public class MyFilter extends ZuulFilter {
    
        private static Logger log = LoggerFactory.getLogger(MyFilter.class);
    
    
        /**
         * filterType：返回一个字符串代表过滤器的类型，在zuul中定义了四种不同生命周期的过滤器类型，具体如下：
         *      pre：路由之前
         *      routing：路由之时
         *      post： 路由之后
         *      error：发送错误调用
         * @return
         */
        @Override
        public String filterType() {
            return "pre";
        }
    
        /**
         * 过滤的顺序
         * @return
         */
        @Override
        public int filterOrder() {
            return 0;
        }
    
        /**
         * 这里可以写逻辑判断，是否要过滤，本文true,永远过滤
         * @return
         */
        @Override
        public boolean shouldFilter() {
            return true;
        }
    
        /**
         * 过滤器的具体逻辑。可用很复杂，包括查sql，nosql去判断该请求到底有没有权限访问
         * @return
         */
        @Override
        public Object run() {
            RequestContext ctx = RequestContext.getCurrentContext();
            HttpServletRequest request = ctx.getRequest();
    
            log.info(String.format("%s >>> %s", request.getMethod(), request.getRequestURL().toString()));
    
            Object accessToken = request.getParameter("token");
            if(accessToken == null) {
                log.warn("token is empty");
                ctx.setSendZuulResponse(false);
                ctx.setResponseStatusCode(401);
                try {
                    ctx.getResponse().getWriter().write("token is empty");
                }catch (Exception e){
    
                }
                return null;
            }
    
            log.info("ok");
            return null;
        }
    }

这时访问：[http://localhost:8769/api-a/hi?name=forezp][http_localhost_8769_api-a_hi_name_forezp] ；网页显示：

token is empty

访问 [http://localhost:8769/api-a/hi?name=forezp&token=22][http_localhost_8769_api-a_hi_name_forezp_token_22] ；网页显示：

hi forezp,i am from port:8762

参考博客：[https://blog.csdn.net/forezp/article/details/69939114][https_blog.csdn.net_forezp_article_details_69939114]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RocXR6cQ_size_16_color_FFFFFF_t_70]: /images/20220125/cb75571f8c2448babb74e15ea46a25a5.png
[http_localhost_8769_api-a_hi_name_forezp]: http://localhost:8769/api-a/hi?name=forezp
[http_localhost_8769_api-a_hi_name_forezp_token_22]: http://localhost:8769/api-a/hi?name=forezp&token=22
[https_blog.csdn.net_forezp_article_details_69939114]: https://blog.csdn.net/forezp/article/details/69939114