Getting Started with Spring Boot and Spring Cloud Gateway

Prerequisites:

• Java Development Kit (JDK) 8 or later installed
• Maven installed
• Spring Boot IDE or any preferred IDE

Step 1: Create Eureka Server

1. Create a new Spring Boot project with the following dependencies:

• Eureka Server

1. Open the src/main/resources/application.properties file and configure the Eureka server:

   spring.application.name=eureka-server
   server.port=8761

   eureka.client.register-with-eureka=false
   eureka.client.fetch-registry=false

3. Add the @EnableEurekaServer annotation to your main application class:

4. Run the Eureka Server application.

Step 2: Create Microservice 1

1. Create a new Spring Boot project with the following dependencies:

• Eureka Discovery
• Web

1. Open the src/main/resources/application.properties file and configure the microservice:

   spring.application.name=microservice1
   server.port=8081

   eureka.client.service-url.default-zone=http://localhost:8761/eureka/

3. Create a simple controller for testing:

4. Run Microservice 1.

Step 3: Create Microservice 2

1. Create another Spring Boot project with the following dependencies:

• Eureka Discovery
• Web

1. Open the src/main/resources/application.properties file and configure the microservice:

   spring.application.name=microservice2
   server.port=8082

   eureka.client.service-url.default-zone=http://localhost:8761/eureka/

3. Create a simple controller for testing:

4. Run Microservice 2.

Step 4: Create Spring Cloud Gateway

1. Create a new Spring Boot project with the following dependencies:

• Eureka Discovery
• Gateway
• Web

1. Open the src/main/resources/application.properties file and configure the gateway:

   spring.application.name=gateway
   server.port=8080

   spring.cloud.gateway.routes[0].id=microservice1
   spring.cloud.gateway.routes[0].uri=lb://microservice1
   spring.cloud.gateway.routes[0].predicates[0]=Path=/microservice1/**

   spring.cloud.gateway.routes[1].id=microservice2
   spring.cloud.gateway.routes[1].uri=lb://microservice2
   spring.cloud.gateway.routes[1].predicates[0]=Path=/microservice2/**

   eureka.client.service-url.default-zone=http://localhost:8761/eureka/

3. Run the Gateway application.
4. Access the microservices through the gateway:

• Microservice 1: http://localhost:8080/microservice1/api/hello
• Microservice 2: http://localhost:8080/microservice2/api/hello

That’s it! You’ve successfully set up a Spring Cloud Gateway with Eureka and two microservices. You can expand this setup by adding more routes to the gateway and additional microservices.