微服务-服务网关

1. pom.xmx

	org.springframework.cloud
    spring-cloud-starter-alibaba-nacos-discovery




	org.springframework.cloud
    spring-cloud-starter-openfeign




	org.springframework.cloud
    spring-cloud-starter-gateway

2. 启动类标注注解：@EnableDiscoveryClient
3. 配置文件：application.yml

server:
  port: 10016

spring: 
	application: 
		name: service-gateway
	cloud:
		nacos: 
			discovery: 
				server-addr: 127.0.0.1:50101
		gateway:
			discovery: 
				locator: 
					enable: true  # 开启服务发现路由
			routes: 
				- id: service-a  # 不重复即可
				  name: lb://service-a   # 服务名或（ip+端口:http://localhost:8080）
			      predicates: 
			      	- path=/aaa/**   # 断言：匹配规则
			     
			    - id: service-b  
				  name: lb://service-b 
			      predicates: 
			      	- path=/bbb/**  
			

4. 自定义全局Filter

   • 实现 GatewayFilterFactory接口，重写 shortcutFieldOrder方法
   • 编写的过滤器类必须要以 GatewayFilterFactory结尾
   • 自定义过滤器的名字为，GatewayFilterFactory前面的字符