非Spring Boot启动Gateway

要在非Spring Boot环境中启动Gateway，需要按照以下步骤进行操作：

1. 引入相关依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-gateway-core</artifactId>
    <version>2.2.1.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netty4</artifactId>
    <version>2.2.1.RELEASE</version>
</dependency>

2. 创建Gateway的配置类

@Configuration
public class GatewayConfig {
    private static final String ROUTE_ID = "test_route";
    private static final String DESTINATION_URL = "http://localhost:8080";
    private static final String PATH = "/test/**";

    @Bean
    public RouteLocator customRouteLocator() {
        return Routes.locator()
                .route(ROUTE_ID, r -> r.path(PATH)
                        .uri(DESTINATION_URL))
                .build();
    }
}

3. 启动Gateway

public class GatewayApplication {
    public static void main(String[] args) {
        ApplicationContext context = new AnnotationConfigApplicationContext(GatewayConfig.class);
        GatewayServerProperties properties = context.getBean(GatewayServerProperties.class);
        GatewayServer server = new GatewayServer(properties);
        server.start();
    }
}

以上是基本的配置，可以根据具体需求进行扩展。需要注意的是，在非Spring Boot环境中启动Gateway，还需要手动配置一些参数，例如连接超时时间、线程池大小等。