springcloud feign 远程调用

项目清单

Feign 需要注册到 eureka 服务中,下面分别建立四个项目

• eureka-server (spring-cloud-rureka-server-feign) name:eureka-server-feign port:9090
• parent -feign[父项目] -(spring-cloud-feign) -- 以下项目采用聚合工程
  • feign-api[契约服务] name:feign-api port:8081
  • feign-consumer[服务消费端] name:person-consumer port:8082
  • feign-provider[服务提供方] name:person-provider port:8083

Eureka Server 项目

1.Maven 导入

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>

2.Application.java 增加注解

@SpringBootApplication
@EnableEurekaServer //开启eureka server
public class SpringCloudRurekaServerFeignApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringCloudRurekaServerFeignApplication.class, args);
	}
}

3.修改 application.properties

server.port = 9090
spring.application.name = eureka-server-feign
eureka.client.fetch-registry = false
eureka.client.register-with-eureka = false
# 开启全部actuator管理
management.endpoints.web.exposure.include=* 

Parent : Feign 项目(spring-cloud-feign)

1.Maven 导入

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<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>

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

2.修改pom

新建 Module : feign-api

1.修改 pom

<parent>
    <groupId>com.blaaair</groupId>
    <artifactId>spring-cloud-feign</artifactId>
    <version>0.0.1-SNAPSHOT</version>
</parent>

2.Application.java 配置

@SpringBootApplication
@EnableEurekaClient
public class SpringCloudFeignApiApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringCloudFeignApiApplication.class, args);
	}
}

3.application.properties 配置

server.port = 8081
spring.application.name = feign-api
eureka.client.service-url.defaultZone = http://localhost:9090/eureka
management.endpoints.web.exposure.include=*

4.增加接口

@FeignClient("person-provider") //person-provider : 接口提供方应用名称
public interface PersonService {

    @PostMapping("/person/save")
    boolean save(@RequestBody Person person);
}

新建 Module :feign-consumer

1.修改 pom

<parent>
    <groupId>com.blaaair</groupId>
    <artifactId>spring-cloud-feign</artifactId>
    <version>0.0.1-SNAPSHOT</version>
</parent>

需在依赖中增加 feign-api

2.Application.java 配置

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients(clients = PersonService.class) //接受暴露出的
public class SpringCloudFeignApiApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringCloudFeignApiApplication.class, args);
	}
}

3.application.properties 配置

server.port = 8082
spring.application.name = person-consumer
eureka.client.service-url.defaultZone = http://localhost:9090/eureka
management.endpoints.web.exposure.include=*

4.增加调用远程 service 的 controller

@RestController
public class PersonController implements PersonService {

    private final PersonService personService;

    @Autowired
    public PersonController(PersonService personService) {
        this.personService = personService;
    }

    @Override
    public boolean save(Person person) {
        return personService.save(person);
    }
}

新建 Module : feign-provider

1.修改 pom

<parent>
    <groupId>com.blaaair</groupId>
    <artifactId>spring-cloud-feign</artifactId>
    <version>0.0.1-SNAPSHOT</version>
</parent>

需在依赖中增加 feign-api

2.Application.java 配置

@SpringBootApplication
@EnableEurekaClient
public class SpringCloudFeignApiApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringCloudFeignApiApplication.class, args);
	}
}

3.application.properties 配置

server.port = 8083
# 这里的name 与feign-api中@FeignClient("person-provider")对应
spring.application.name = person-provider
eureka.client.service-url.defaultZone = http://localhost:9090/eureka
management.endpoints.web.exposure.include=*

4.提供的调用 controller

@RestController
public class PersonController {

    @PostMapping("/person/save")
    boolean save(@RequestBody Person person){
        return new HashMap<>().put(person.getId(),person)==null;
    }
}

测试

1. 分别启动项目:eureka-server - > feign-provider - > feign-api - > feign-consumer

2. POSTMAN : localhost:8082/person/save ,

• raw:

{
	id:1,
	name:"ws"
}

3. 返回:true 则表示成功!
4. 调用顺序 : postman --> consumer --> provider