spring cloud gateway网关(一)之网关路由

 <dependencies>
        <!--Eureka Client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!--特别注意：在 gateway 网关服务中不能引入 spring-boot-starter-web 的依赖，否则会报错-->
        <!-- Spring cloud gateway 网关依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>

        <!-- LoadBalancer -->
        <!-- 引入spring-cloud-loadbalancer -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
        </dependency>
        <!--ribbon Spring Cloud Ribbon 在高版本移除了 -->
<!--        <dependency>-->
<!--            <groupId>org.springframework.cloud</groupId>-->
<!--            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>-->
<!--            <version>2.2.5.RELEASE</version>-->
<!--        </dependency>-->

    </dependencies>

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

}

server:
  port: 8081
spring:
  application:
    name: gateway-server-one

#客户端注册
eureka:
  instance:
    instance-id: ${eureka.instance.hostname}:${spring.application.name}:${server.port} #localhost
    hostname: localhost
  client:
    register-with-eureka: true #是否向注册中心注册自己 默认为true
    fetch-registry: true  #是否需要检索服务  默认为true
    service-url:
      defaultZone: http://eternity:1234qwer@localhost:4405/eureka/

spring:
  application:
    name: gateway-server-one
  cloud:
    loadbalancer:
      ribbon:
        enabled: false #使用LoadBalancer， Ribbon 在高版本移除了 切换到ReactiveLoadBalancerClientFilter
    gateway:
      discovery: 
        locator: #路由访问方式：http://Gateway_HOST:Gateway_PORT/大写的serviceId/**，其中微服务应用名默认大写访问。
          enabled: true #开启通过名称找到服务器功能
          lower-case-service-id: true #使用小写service-id
      routes:
        - id: hibernate-server-one-route #路由的ID，没有固定规则,但要求唯一，建议与服务名对应
          uri: http://localhost:8800  #匹配后提供服务的路由地址
          predicates:
            #以下是断言条件，必选全部符合条件
            - Path=/admin/user/**   #断言,路径相匹配的进行路由
            - Method=GET #只能时 GET 请求时，才能访问
        - id: xxl-job-server-one-route
#          uri: http://localhost:8801 #可以设置为服务名
          uri: lb://XXL-JOB-SERVER-MODEL #可以设置为服务名
          predicates:
            - Path=/admin/user/**   #断言,路径相匹配的进行路由, 注意：Path 中 P 为大写
            - After=2022-06-06T03:29:37.318-07:00 # [Asia/Shanghai] # after来进行设置，后面添加一个时间，就是指在什么时间之后这个服务才可以被访问，否则将无法被访问到
#            - After=2030-01-20T17:42:47.789-07:00 # [America/Denver]

http://localhost:8081/admin/user/

 uri: lb://XXL-JOB-SERVER-MODEL #可以设置为服务名

java.net.UnknownHostException: failed to resolve 'xxl-job-server-model' after 4 queries 
    at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:1013) ~[netty-resolver-dns-4.1.58.Final.jar:4.1.58.Final]
    Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
    |_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
    |_ checkpoint ⇢ HTTP POST "/admin/user/" [ExceptionHandlingWebHandler]
Stack trace:
        at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:1013) ~[netty-resolver-dns-4.1.58.Final.jar:4.1.58.Final]
        at io.netty.resolver.dns.DnsResolveContext.tryToFinishResolve(DnsResolveContext.java:966) ~[netty-resolver-dns-4.1.58.Final.jar:4.1.58.Final]
        at io.netty.resolver.dns.DnsResolveContext.query(DnsResolveContext.java:414) ~[netty-resolver-dns-4.1.58.Final.jar:4.1.58.Final]

hostname: localhost