官网：https://spring.io/projects/spring-cloud-gateway#learn

依赖：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>

配置样例：

spring:
  cloud:
    gateway:
      routes:
        - id: cainiao_route
          uri: https://www.runoob.com/
          predicates:
            # 如果有名为 cainiao 的参数就跳转到 https://www.runoob.com/
            - Query=cainiao

        - id: baidu_route
          uri: https://www.baidu.com/
          predicates:
            # 如果有名为 cainiao 的参数 并且值为 baidu 就跳转到 https://www.baidu.com/
            - Query=url,baidu

        - id: product_route
          # lb: Load Balance 负载均衡 去注册中心 找名为 gulimall-product 的服务
          uri: lb://gulimall-product
          predicates:
            - Path=/api/product/**
          filters:
            # 过滤掉 /api 保留后部分
            # eg: localhost:88/api/product/brand/list -> gulimall-product/product/brand/list
            # 网关去注册中心找实际地址 -> localhost:10000/product/brand/list
            - RewritePath=/api/(?<segment>.*), /$\{segment}

        - id: third_party_route
          uri: lb://gulimall-third-party
          predicates:
            - Path=/api/thirdparty/**
          filters:
            - RewritePath=/api/thirdparty/(?<segment>.*), /$\{segment}

        - id: member_route
          uri: lb://gulimall-member
          predicates:
              - Path=/api/member/**
          filters:
              - RewritePath=/api/(?<segment>.*), /$\{segment}

        - id: ware_route
          uri: lb://gulimall-ware
          predicates:
            - Path=/api/ware/**
          filters:
            - RewritePath=/api/(?<segment>.*), /$\{segment}

        - id: admin_route
          uri: lb://renren-fast
          predicates:
            - Path=/api/**
          filters:
            # 过滤 /api 并且在后部分的前面 拼接 /renren-fast
            - RewritePath=/api/(?<segment>.*), /renren-fast/$\{segment}