Spring Cloud 整合

Spring Cloud 整合指的是将Spring Cloud微服务组件整合在一起。以下是一个简单的Spring Cloud整合示例，包括Eureka服务注册中心、一个服务提供者和一个服务消费者。

1. 创建Eureka服务注册中心:

@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServerApplication.class, args);
    }
}

application.properties:

spring.application.name=eureka-server
server.port=8761
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/

2. 创建服务提供者:

@SpringBootApplication
@EnableEurekaClient
@RestController
public class ServiceProviderApplication {
    @Value("${server.port}")
    private String port;
 
    @GetMapping("/hello")
    public String hello() {
        return "Hello from port: " + port;
    }
 
    public static void main(String[] args) {
        SpringApplication.run(ServiceProviderApplication.class, args);
    }
}

application.properties:

spring.application.name=service-provider
server.port=8080
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/

3. 创建服务消费者:

@SpringBootApplication
@EnableEurekaClient
@RestController
public class ServiceConsumerApplication {
    @Autowired
    private RestTemplate restTemplate;
 
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
 
    @GetMapping("/call-service")
    public String callService() {
        return restTemplate.getForObject("http://localhost:8080/hello", String.class);
    }
 
    public static void main(String[] args) {
        SpringApplication.run(ServiceConsumerApplication.class, args);
    }
}

application.properties:

spring.application.name=service-consumer
server.port=8081
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/

启动Eureka服务注册中心，然后启动服务提供者和服务消费者。服务提供者将注册到Eureka服务注册中心，服务消费者可以通过Eureka发现服务并调用它。