11. Zuul routing gateway

1. summary

Zuul It includes two main functions of request routing and filtering ：
The routing function is responsible for forwarding external requests to specific microservice instances , It is the foundation of external access to the unified portal, while the filter function is responsible for intervening in the processing of requests , Is to implement request verification 、 Service aggregation and other functions .

Zuul and Eureka Integration , take Zuul Register yourself as Eureka Application under service governance , Simultaneously from Eureka Get messages from other microservices , That is to say, the access to microservices in the future is through Zuul Jump to get .

 Be careful ：Zuul The service will eventually register in Eureka

Provide = agent + route + Three functions of filtering

github: https://github.com/Netflix/zuul/wiki/Getting-Started

2. newly build Module modular microservicecloud-zuul-gateway-9527

2.1 Change pom

When you don't know which version to use with , Direct search Dalston.SR1.

<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Dalston.SR1</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>

        <!-- zuul Routing Gateway  -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zuul</artifactId>
            <version>1.4.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
            <version>1.4.0.RELEASE</version>
        </dependency>
        <!-- actuator monitor  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <!--  Hot deployment plug-in  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

2.2 Change yml

server:
  port: 9527

spring:
  application:
    name: microservicecloud-zuul-gateway

zuul:
  prefix: /atguigu
  ignored-services: "*" #  Ignore real service name 
  routes:
    mydept.serviceId: cloud-payment-service
    mydept.path: /path/**

eureka:
  client:
    register-with-eureka: true
    fetchRegistry: true
    service-url:
      defaultZone: http://localhost:7001/eureka
  # defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka # Cluster version 
  instance:
    instance-id: zullgateway9527
    prefer-ip-address: true
    lease-renewal-interval-in-seconds:  1
    lease-expiration-duration-in-seconds:  2

2.3 Start class

@EnableZuulProxy： Turn on zuul Gateway agent

@SpringBootApplication
@EnableZuulProxy
@EnableEurekaClient
@Slf4j
public class ZuulStartSpringCloudApp9527 {
    
    public static void main(String[] args)
    {
    
        SpringApplication.run(ZuulStartSpringCloudApp9527.class, args);
        log.info("===============ZuulStartSpringCloudApp9527 Successful launch ===============");
    }
}

2.4 Route access mapping rules

before
http://localhost:9527/atguigu/cloud-payment-service/payment/get/3

zuul:
routes:
mydept.serviceId: microservicecloud-dept
mydept.path: /mydept/**

after
http://localhost:9527/atguigu/path/payment/get/3

adopt cloud-payment-service perhaps path All accessible .

The original real service name is ignored ：
ignored-services： Single specific , Multiple can be used "*"

Set a uniform public prefix ：
prefix: /atguigu

2.5 test

start-up cloud-eureka-server7001, start-up cloud-provider-payment8001, start-up microservicecloud-zuul-gateway-9527, take 8001 and 9527 All registered to eureka.

visit ：http://localhost:9527/atguigu/path/payment/get/3 Normal return .