Spring Cloud Gateway Setup Guide

You can achieve API gateway functionality easily by configuring Spring Cloud Gateway component. Below are the steps to use Spring Cloud Gateway component.

1. This is a project object model file.

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

1. This is the configuration.

@Configuration
public class GatewayConfig {

    @Bean
    public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
        return builder.routes()
                .route("route_name", r -> r.path("/api/**")
                        .filters(f -> f.stripPrefix(1))
                        .uri("http://example.com"))
                .build();
    }
}

In the above configuration class, the customRouteLocator method returns a RouteLocator object. It creates routing rules through the builder.routes() method, specifies path matching rules using r.path() method, removes the prefix of the request path using f.stripPrefix() method, and specifies the forwarding target URL using the uri() method.

1. Configuration file: Configure the port number and other relevant settings in the application.properties or application.yml file.
2. Start the application: Once the application is launched, the Gateway component will automatically load the configuration and start up.

These are the basic steps for using the Spring Cloud Gateway component, you can further configure and expand according to your own needs.