Spring Cloud GateWay 简单示例

前提：提供一个注册中心，可以使用Eureka Server。供gateway转发请求时获取服务实例。

一、新建GateWay项目

1、引入maven依赖

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

2、在主类上启用服务发现注册注解 @EnableDiscoveryClient

3、配置文件application.yml内容如下：

# 注册中心
eureka:
  client:
    service-url:
      defaultZone: http://test:123456@localhost:9090/os/eureka/
    fetch-registry: true
    register-with-eureka: true

spring:
  application:
    name: gateway-service
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true
          lower-case-service-id: true # 服务名小写
      routes:
        - id: consumer-service  #路由的ID，没有固定规则但求唯一，建议配合服务名
          uri: lb://consumer-service # 匹配后提供服务的路由地址，lb代表从注册中心获取服务，且以负载均衡方式转发
          predicates:
            - Path=/consumer/** #断言，路径相匹配的进行路由
          filters: # 加上StripPrefix=1，否则转发到后端服务时会带上consumer前缀
            - StripPrefix=1

server:
  port: 9999

# 暴露监控端点
management:
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      show-details: always

二、新建服务提供者项目ConsumerService

1、引入maven依赖

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

2、在主类上启用服务发现注册注解 @EnableDiscoveryClient

3、application.yml内容如下：

server:
  port: 9700

spring:
  application:
    name: consumer-service 

eureka:
  client:
    service-url:
      defaultZone: http://test:123456@localhost:9090/os/eureka/
    fetch-registry: true
    register-with-eureka: true

4、新建 IndexController ，添加一个 hello 方法，传入name参数，访问后返回 hi + name 字符串

@RestController
public class IndexController {

    @RequestMapping("/hello")
    public String hello(String name){
        return "hi " + name;
    }
}

5、启动eureka、gateway、consumerservice，gateway和consumerservice都注册在eureka了。

通过网关访问consumer-service的hello方法，http://localhost:9999/consumer/hello?name=zy ，效果如下，说明请求已经转发到consumer-service服务上了。