SpringCloud Gateway （3）服务注册与发现

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 以 Eureka 作为服务注册中心，通过 gateway 网关转发所有服务

        整体项目结构如下：

模块名	端口	功能
demo-eureka	8760	注册中心
demo-gateway	8761	网关服务
demo-server	8762	服务提供者

1 注册中心

pom.xml

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>

application.yml

server:
  port: 8760

spring:
  application:
    name: demo-eurka
    
eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

EurekaApplication.java

@SpringBootApplication
@EnableEurekaServer
public class EurekaApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaApplication.class, args);
    }

}

2 网关服务

pom.xml

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

application.yml

server:
  port: 8761

#微服务名称
spring:
  application:
    name: demo-gateway
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
          lowerCaseServiceId: true
      routes:
        #路径匹配
        - id: demo-server
          uri: lb://demo-server
          predicates:
            - Path=/api/hi/**
          filters:
            - RewritePath=/api/(?<segment>.*), /${segment}
            - AddRequestHeader=X-Request-Foo, Bar

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8760/eureka/

3 服务提供者

pom.xml

<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>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

application.yml

server:
  port: 8762

spring:
  application:
    name: demo-server

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8760/eureka/

TestController.java

@RestController
public class TestController {

    @Value("${server.port}")
    String port;

    @GetMapping("/hi")
    public String home(@RequestParam(value = "name", defaultValue = "zhangsan") String name) {
        return "hi " + name + " ,i am from port:" + port;
    }

}

依次启动注册中心，网关，服务提供者 三个服务

先通过服务直连，访问 http://localhost:8762/hi?name=bruce

再试通过网关转发，访问 http://localhost:8761/api/hi?name=bruce2