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This article mainly explains "how springboot integrates gateway to achieve gateway function". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how springboot integrates gateway to achieve gateway function".

1. Use the scene:

The gateway can provide services such as request routing and composition, protocol conversion, security authentication, service authentication, flow control and log monitoring. There are many gateways to choose from, such as Nginx, Linkerd, eureka, Spring Cloud Gateway, consul and so on.

Spring Cloud Gateway makes all kinds of judgment and processing for incoming requests, such as judging the validity of requests, authority verification, request address rewriting, request parameters, header information, cookie information analysis and rewriting, request rate control, log retention, and so on. These can be easily realized through the combination of Predicate and GatewayFilter.

two。 Code implementation 1 creates a gateway-service service

Introduce dependency

Org.springframework.cloud spring-cloud-starter-gateway 3.0.4 com.alibaba.cloud spring-cloud-starter-alibaba-nacos-discovery com.alibaba.cloud spring-cloud-starter-alibaba-nacos-config Org.springframework.cloud spring-cloud-starter-openfeign 3.0.2 org.springframework.cloud spring-cloud-loadbalancer 3.0.2 org.springframework.cloud spring-cloud-starter-loadbalancer

Yml configuration

Server: port: 8001spring: application: name: gateway-service # Service name profiles: active: dev # Environment Settings cloud: gateway: routes: # transparent transfer Service-id: gateway-client # set routing id (in theory it can be written casually) uri: lb://gateway-client # set the url lb://nacos service registration name of the route Predicates:-Path=/client/** # path matching rules filters:-StripPrefix=1-id: gateway-consumer uri: lb://gateway-consumer predicates:-Path=/consumer/** filters:-StripPrefix=1

Cross-domain configuration

@ Configurationpublic class CorsConfig {@ Bean public CorsWebFilter corsFilter () {CorsConfiguration config = new CorsConfiguration (); config.addAllowedMethod ("*"); config.addAllowedOrigin ("*"); config.addAllowedHeader ("*"); UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource (new PathPatternParser ()); source.registerCorsConfiguration ("/ *", config); return new CorsWebFilter (source);}} 2 create gateway-client service

Introduce dependency

Org.springframework.boot spring-boot-starter org.springframework.boot spring-boot-starter-test test org.springframework.cloud spring-cloud-starter-alibaba-nacos-discovery 0.2.1.RELEASE org. Springframework.cloud spring-cloud-starter-openfeign org.springframework.boot spring-boot-starter-web

Yml configuration

Server: port: 8002spring: application: name: gateway-client # Service name profiles: active: dev # Environment Settings cloud: nacos: discovery: server-addr: 127.0.0.1 discovery 8848 # nacos Service Registration

Control layer request

@ RestControllerpublic class TestController {@ RequestMapping ("/ index") public String index () {return "gateway-client";}}

Startup class

@ SpringBootApplication@EnableDiscoveryClientpublic class GatewayClientApplication {public static void main (String [] args) {SpringApplication.run (GatewayClientApplication.class, args);}} 3. Realize the effect

Use nacos as the registration center, start nacos and then start the gateway-service and gateway-client project

Successfully registered with nacos Discovery Service

Initiate a request in the browser

Http://localhost:8001/client/index

In fact, the gateway sends the request to the gateway-client service and returns the result

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