如何使用Spring Cloud Gateway实现一个最简单的API网关示例

1. 创建第一个SpringBoot应用作为网关服务

# 服务器端口
server.port=8080

# Spring Cloud Gateway 配置
spring.cloud.gateway.routes[0].id=demo1
spring.cloud.gateway.routes[0].uri=http://localhost:8081
spring.cloud.gateway.routes[0].predicates[0]=Path=/demo1

spring.cloud.gateway.routes[1].id=demo2
spring.cloud.gateway.routes[1].uri=http://localhost:8082
spring.cloud.gateway.routes[1].predicates[0]=Path=/demo2

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

2. 创建第二个SpringBoot应用作为后端应用

server.port=8081

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-web</artifactId>
	<version>3.3.5</version>
</dependency>
<dependency>
	<groupId>org.mybatis.spring.boot</groupId>
	<artifactId>mybatis-spring-boot-starter</artifactId>
	<version>3.0.3</version>
</dependency>

@RestController
@RequestMapping("/demo1")
public class Demo1Controller {
    @GetMapping()
    public String getInfo() {
        return "demo1 service is running";
    }
}

3. Demo2同理，只是端口为8082
4. 访问http://localhost:8080/demo1或者http://localhost:8080/demo2即可完成网关转发