利用OpenFeign+Eureka实现HTTP调用的简单示例
[*]由于RPC调用须要利用注册中心，以是首先须要创建eureka服务，创建SpringBoot项目后导入spring-cloud-starter-netflix-eureka-server，留意SpringBoot和SpringCloud版本同等性，然后举行配置，启动类添加注解@EnableEurekaServer
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
server:
port: 8761
spring:
application:
name: eureka
eureka:
client:
register-with-eureka: false # 不向Eureka注册自己
fetch-registry: false # 不从Eureka获取注册信息
service-url:
defaultZone: http://localhost:8761/eureka/
@SpringBootApplication
@EnableEurekaServer
public class EurekaApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaApplication.class, args);
}
}
[*]创建服务提供者SpringBoot应用，关键是导入spring-cloud-starter-netflix-eureka-client依靠，举行eureka的配置，编写controller接入层代码，启动类不须要加@EnableEurekaClient注解，因为在新版本中已经被移除
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
server:
port: 8082
spring:
application:
name: producer
eureka:
client:
register-with-eureka: true
fetch-registry: true
service-url:
defaultZone: http://localhost:8761/eureka/
@RestController
@RequestMapping("/api")
public class DataController {
@GetMapping("/data")
public String getData() {
System.out.println("服务提供者被调用");
return "Hello from Producer!";
}
}
[*]创建服务消费者SpringBoot应用，引入如下三个关键依靠，举行eureka配置，编写接口，编写接入层代码调用该接口，启动类须要加上@EnableFeignClients
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
server:
port: 8083
spring:
application:
name: consumer
eureka:
client:
register-with-eureka: true
fetch-registry: true
service-url:
defaultZone: http://localhost:8761/eureka/
@FeignClient(name = "producer") // 此处不需要写url = "http://localhost:8082"，因为通过注册中心调用
public interface ProducerClient {
@GetMapping("/api/data")
String getData();
}
@RestController
@RequestMapping("/consumer")
public class ConsumerController {
@Autowired
private ProducerClient producerClient;
@GetMapping("/data")
public String getDataFromProducer() {
return producerClient.getData();
}
}
@SpringBootApplication
@EnableFeignClients
public class ConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(ConsumerApplication.class, args);
}
}
[*]总结
[*]通过引入eureka注册中心后，如果服务提供者有多个节点，那么哀求就会被发送到存活的节点上，实现了动态路由，避免因为固定写url但是该节点宕机导致调用失败的题目
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