Creation of gateway routing service

Quick start

1. Import dependence ,gateway yes SpringCloud Officially developed , So we need to ensure that the father maven Added to the project SpringCloud Version manager for

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

2. To configure yml file

   server:
     port: 8080
   spring:
     application:
       name: api-gateway-demo
     cloud:
       #  Start gateway Configuration of 
       gateway:
         #  Configure routing rules , This is an array 
         routes:
           - id: order_route #  Unique identification of the route , At present, which service does this gateway route to , This id Take the corresponding name , But there is no mandatory requirement to customize 
             uri: http://127.0.0.1:8083 #  Address to forward , Here is the order service url
             #  Configure assertion rules , Used for routing rule matching   Never forward any requests to the above uri in 
             predicates:
               - Path=/order_server/**   
                   # PredicateDefinition Object's name Properties are all String, So here we specify that any attribute is a value ,Path
                   #  So we need to use =, It will internally assign values for us through reflection 
                   #  We usually specify such a prefix to distinguish routes , That is to say, my browser requests http://localhost:8080/order_server/order/add
                   #  It will forward as http://127.0.0.1:8083/order_server/order/add
                   #  But our order service is not order_server This prefix is , Just directly http://127.0.0.1:8083/order/add
                   #  So we need to use a filter to remove  order_server The prefix 
             #  Configure filters 
             filters:
               - StripPrefix=1 # StripPrefix Remove the first layer path before forwarding 
           #- id: stock_route  You can write multiple routes , The format refers to the above 
   

3. Start the project for testing , Here, when we enter http://localhost:8080/order_server/order/add It will perform route resolution and become http:/127.0.0.1:8083/order/add

Integrate Nacos

In the quick start section above , The address of the forwarding path is written in the configuration file , There will be many problems that are difficult to maintain , For example, the server is migrated and replaced ip、 The service cluster also needs the middle tier to balance the load … So we need to get the service address through the Registration Center

1. add to nacos rely on

   <dependencies>
       <!-- gateway rely on -->
       <dependency>
           <groupId>org.springframework.cloud</groupId>
           <artifactId>spring-cloud-starter-gateway</artifactId>
       </dependency>
       
       <!-- nacos The registry relies on -->
       <dependency>
           <groupId>com.alibaba.cloud</groupId>
           <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
       </dependency>
   </dependencies>
   

2. To write yml To configure

   server:
     port: 8080
   spring:
     application:
       name: api-gateway
     cloud:
       #  Start gateway Configuration of 
       gateway:
         routes:
           - id: order_route
             # lb Means from nacos Get microservices by name in , And follow the load balancing strategy ,lb,LoadBalancer, and order-service Is the service name 
             uri: lb://order-service 
             predicates:
               - Path=/order_server/**
             filters:
               - StripPrefix=1
       # nacos Configuration of 
       nacos:
         discovery:
           server-addr: 127.0.0.1:8848
           username: nacos
           password: nacos
          
   

3. Restart the service for testing

   

   nacos List of services for

   

There is also a way to abbreviate ： Remove the routing configuration , add spring.cloud.gateway.discovery.locator.enabled=true

In the request url Use in http://loclhost:8080/ service name /order/add, It will automatically find the remote address of the service in the registry according to the service name , And it will be automatically removed uri At the level of service name

server:
  port: 8080
spring:
  application:
    name: api-gateway
  cloud:
    #  Start gateway Configuration of 
    gateway:
      discovery:
        locator:
          enabled: true
    # nacos Configuration of 
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
        username: nacos
        password: nacos

test

Of course , In daily development , This method is not very useful , More often, we use the method of configuring routes , The code is more readable , And more flexible