springCloud的使用03-----服务消费者(feign)

1 创建springboot项目，引入jar依赖

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.beifeng.hadoop</groupId>
    <artifactId>beifeng-spring-cloud-consumer-feign</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>beifeng-spring-cloud-consumer-feign</name>
    <url>http://maven.apache.org</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath />
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- 声明为web项目 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- 配置eureka -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>

        <!-- 配置feign依赖 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Dalston.RC1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>

2 配置相关配置

eureka:
 client:
  serviceUrl:
   defaultZone: http://localhost:8761/eureka/ #注册服务器地址
server:
  port: 8765
spring:
  application:
    name: cloud-consumer-feign

3 调用服务接口

@FeignClient("service-hi")//指定调用哪个服务提供者
public interface IHiService {

    @RequestMapping(value="/info",method=RequestMethod.GET)//指定调用服务提供者的哪个接口
    String info();
}

4 在启动类中声明使用feign

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients//启用feign
@RestController
public class ConsumerFeign {

    private static final Logger logger = LoggerFactory.getLogger(ConsumerFeign.class);

    @Autowired
    IHiService hiService;

    @RequestMapping("info")
    public String info() {
        String response=hiService.info();
        logger.info(response);
        return response;
    }

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

5 启用查看结果

　　feign内置了ribbon,自动实现负载均衡