Spring Cloud（十二）Zuul实战

亦凉 2022-12-16 15:24 209阅读 0赞

## 前期准备 ##

1、创建一个Eureka Server工程，项目名称：eureka-server

2、创建一个Eureka Client 服务提供者 工程，项目名称：eureka-client1

工程eureka-server和eureka-client1 创建请参考

[Spring Cloud（三）Eureka实战][Spring Cloud_Eureka]

## 1、启动Eureka 服务提供者、Eureka注册中心 ##

启动`eureka-server、eureka-client1`

PS：eureka-client1 在idea中通过多实例启动

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5OTE0ODM3_size_16_color_FFFFFF_t_70_pic_center]

查看 Eureka 控制台

![在这里插入图片描述][20201018212436642.png_pic_center]

## 2、创建并启动路由网关 ##

项目名称：service-zuul

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.yi</groupId>
        <artifactId>service-zuul</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
        <name>service-zuul</name>
        <description>Zuul路由转发和过滤器</description>
    
        <parent>
            <groupId>com.yi</groupId>
            <artifactId>finchley</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </parent>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
            </dependency>
        </dependencies>
    
    </project>

@SpringBootApplication
    @EnableZuulProxy
    @EnableEurekaClient
    @EnableDiscoveryClient
    public class ServiceZuulApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(ServiceZuulApplication.class, args);
        }
    
    }

> @EnableZuulProxy：开启zuul的功能

eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/
    server:
      port: 8769
    spring:
      application:
        name: service-zuul
    zuul:
      routes:
        api-a:
          path: /service/a/**
          serviceId: service-ribbon1
        api-b:
          path: /service/b/**
          serviceId: service-ribbon2

> /service/a/ 开头的请求都转发给service-ribbon1服务  
> /service/b/ 开头的请求都转发给service-ribbon2服务

浏览器访问两个请求，验证`Zuul路由功能`是否发挥作用

http://localhost:8769/service/a/hello?name=yi
    http://localhost:8769/service/b/hello?name=yi

**自定义过滤器**

> 自定义登录过滤器。如果请求参数存在token，则请求有效，否则拦截。

@Component
    public class LoginFilter extends ZuulFilter {
        private static Logger log = LoggerFactory.getLogger(LoginFilter.class);
    
        @Override
        public String filterType() {
            // 定义为前置过滤器
            return FilterConstants.PRE_TYPE;
        }
    
        @Override
        public int filterOrder() {
            // 在处理请求头之前进行拦截
            return FilterConstants.PRE_DECORATION_FILTER_ORDER - 1;
        }
    
        @Override
        public boolean shouldFilter() {
            // 开启过滤器
            return true;
        }
    
        @Override
        public Object run() {
            // 获取请求上下文,此作用域范围:从请求到达zuul一直到路由结束后返回给客户端这个完整流程.但是它不会存在微服务内,只存在zuul中
            RequestContext ctx = RequestContext.getCurrentContext();
            HttpServletRequest request = ctx.getRequest();
            //获取请求参数
            String accessToken = request.getParameter("token");
            //判断是否存在
            if (StringUtils.isBlank(accessToken)) {
                //不存在,未登录,进行拦截
                ctx.setSendZuulResponse(false);
                ctx.setResponseStatusCode(HttpStatus.FORBIDDEN.value());
            }
            return null;
        }
    }

http://localhost:8769/service/a/hello?name=yi

![在这里插入图片描述][20201021223753177.png_pic_center]

http://localhost:8769/service/a/hello?name=yi&token=yyy
    
    正常访问服务

--------------------

git项目源码：[https://github.com/yilei111/-Spring-Cloud-Finchley][https_github.com_yilei111_-Spring-Cloud-Finchley]

[Spring Cloud_Eureka]: https://blog.csdn.net/qq_29914837/article/details/109085405
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5OTE0ODM3_size_16_color_FFFFFF_t_70_pic_center]: /images/20221123/2e6e06f9df854c7d8a0d180c1376eb8c.png
[20201018212436642.png_pic_center]: /images/20221123/bef4c7fe256c49b4ba1bfb1f3957dd82.png
[20201021223753177.png_pic_center]: /images/20221123/e38ecef13f564d9bb05c195c3c7993ae.png
[https_github.com_yilei111_-Spring-Cloud-Finchley]: https://github.com/yilei111/-Spring-Cloud-Finchley