[bigdata-108] spring-cloud-04 分布式服务的feign消费者

1. 本例，以feign模式，建立一个调用分布式服务的web服务。这个服务调用前三个步骤建立起来的分布式服务。

2. 参考文献

https://github.com/dyc87112/SpringCloudBook/tree/master/feign-consumer

3. 源码目录结构

├── pom.xml
├── src
│ ? ├── main
│ ? │ ? ├── java
│ ? │ ? │ ? └── com
│ ? │ ? │ ? ? ? └── brian
│ ? │ ? │ ? ? ? ? ? └── demo
│ ? │ ? │ ? ? ? ? ? ? ? └── helloserviceconsumer
│ ? │ ? │ ? ? ? ? ? ? ? ? ? ├── App.java
│ ? │ ? │ ? ? ? ? ? ? ? ? ? └── HelloService.java
│ ? │ ? └── resources
│ ? │ ? ? ? └── application.properties

4. pom.xml

<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.brian.demo</groupId>
	<artifactId>helloserviceconsumer</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>helloserviceconsumer</name>
	<url>http://maven.apache.org</url>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.3.7.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<repositories>
		<repository>
			<id>my-nexus-central</id>
			<name>my local nexus</name>
			<url>http://localhost:8081/nexus/content/repositories/central/</url>
			<releases>
				<enabled>true</enabled>
				<updatePolicy>never</updatePolicy>
			</releases>
		</repository>
	</repositories>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>

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

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

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

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

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

		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Brixton.SR5</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>

</project>

package com.brian.demo.helloserviceconsumer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class App {
	@Autowired
	HelloService helloService;

	@RequestMapping(value = "/feign-consumer",method = RequestMethod.GET)
	public String helloConsumer() {
		return helloService.hello();
	}

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

package com.brian.demo.helloserviceconsumer;

import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;

@FeignClient(value = "HELLO-SERVICE")
public interface HelloService {

	@RequestMapping("/hello")
    String hello();

}

spring.application.name=feign-consumer
server.port=9001
eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/,http://localhost:1112/eureka/

mvn clean package

9. 运行

?java -jar target/helloserviceconsumer-0.0.1-SNAPSHOT.jar

10. 查看

http://localhost:9001/feign-consumer

能看到这里返回的字符串是前述部署的服务返回的字符串。