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Commitbc92577

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‎README.md‎

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@@ -18,13 +18,16 @@ Spring Cloud Tutorial 是一本关于 Spring Cloud 学习的开源书。利用
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* Spring Boot Data Redis Starter 2.0.0.M3
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* Redis 3.2.100
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* Spring Cloud Netflix Eureka Server Finchley.M2
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* Spring Cloud Netflix Eureka Client Finchley.M2
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* Spring Cloud Starter OpenFeig Finchley.M2
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##Get Started 如何开始阅读
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选择下面入口之一：
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*<https://github.com/waylau/spring-cloud-tutorial/> 的[SUMMARY.md](SUMMARY.md)（源码）
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*<http://waylau.gitbooks.io/spring-cloud-tutorial/> 点击 Read 按钮（同步更新，国内访问速度一般）
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*<http://git.oschina.net/waylau/spring-cloud-tutorial> 的[SUMMARY.md](SUMMARY.md)（码云，手动同步，有所延时）
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##Code 源码
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‎SUMMARY.md‎

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*[实现服务的注册与发现](docs/register-discover/eureka-in-action.md)（完）
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*[微服务的消费](docs/comsumer/comsumer.md)
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*[微服务的消费模式](docs/comsumer/comsumer-patterns.md)
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*[常见微服务的消费者](docs/comsumer/comsumer-cases.md)
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*[常见微服务的消费者](docs/comsumer/comsumer-cases.md)（完）
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*[实现服务的消费者](docs/comsumer/comsumer-in-action.md)
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*[实现服务的负载均衡及高可用](docs/comsumer/ribbon-in-action.md)
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*[API 网关](docs/api-gateway/api-gateway.md)
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#实现服务的消费者
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本章节，我们将创建一个`micro-weather-feign` 作为服务器的消费者，并演示如何使用 Feign 来消费服务。
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在`micro-weather-eureka-client` 的基础上稍作修改即可
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##开发环境
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* Gradle 4.0
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* Spring Boot 2.0.0.M3
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* Spring Cloud Netflix Eureka Client Finchley.M2
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* Spring Cloud Starter OpenFeig Finchley.M2
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##更改配置
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增加如下配置：
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```groovy
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dependencies {
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//...
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compile('org.springframework.cloud:spring-cloud-starter-openfeign')
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//...
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}
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```
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##声明式 REST 客户端——Feign
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Feign 是一个声明式的 Web 服务客户端。这使得Web服务客户端的写入更加方便。它具有可插拔注释支持，包括Feign注释和JAX-RS注释。Feign还支持可插拔编码器和解码器。Spring Cloud增加了对Spring MVC注释的支持，并且使用了在Spring Web中默认使用的相同的HttpMessageConverter。 在使用Feign时，Spring Cloud集成了Ribbon和Eureka来提供负载平衡的http客户端。
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##一个最简单的 Feign
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主应用：
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```java
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@SpringBootApplication
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@EnableDiscoveryClient
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@EnableFeignClients
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publicclassApplication {
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publicstaticvoidmain(String[]args) {
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SpringApplication.run(Application.class, args);
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}
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}
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```
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编写 Feign 请求接口：
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```java
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packagecom.waylau.spring.cloud.service;
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importorg.springframework.cloud.netflix.feign.FeignClient;
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importorg.springframework.web.bind.annotation.RequestMapping;
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importorg.springframework.web.bind.annotation.RequestMethod;
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/**
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* Hello Client
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*
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*@since 1.0.0 2017年9月17日
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*@author <ahref="https://waylau.com">Way Lau</a>
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*/
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@FeignClient("micro-weather-eureka-client")
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publicinterfaceHelloClient {
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@RequestMapping(method=RequestMethod.GET,value="/hello")
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StringgetHello();
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}
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```
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其中：`@FeignClient`指定了要访问的服务的名称“micro-weather-eureka-client”。
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项目配置：
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```
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spring.application.name: micro-weather-feign
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eureka.client.serviceUrl.defaultZone: http://localhost:8761/eureka/
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feign.client.config.feignName.connectTimeout: 5000
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feign.client.config.feignName.readTimeout: 5000
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```
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##如何测试
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编写测试用例：
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```java
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@RunWith(SpringRunner.class)
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@SpringBootTest
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publicclassHelloClientTest {
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@Autowired
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privateHelloClient helloClient;
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@Test
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publicvoidtestHello() {
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String hello= helloClient.getHello();
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System.out.println(hello);
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}
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}
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```
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启动在之前章节中搭建的`micro-weather-eureka-server` 和`micro-weather-eureka-client` 两个项目。这样，`micro-weather-eureka-client`服务，就能被`micro-weather-feign` 发现，并进行访问。
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启动测试用例，如果一切正常，可以在控制台看到“Hello world”字样。这个就是请求`micro-weather-eureka-client` 服务时响应的内容。
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如果同时也启动了`micro-weather-feign` 项目，则能在
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启动在之前章节中搭建的`micro-weather-eureka-server` 管理界面，看到这个服务的信息。
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![micro-weather-feign](../../images/comsumer/comsumer-eureka.jpg)
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##源码
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本章节源码，见`micro-weather-feign` 。

‎docs/register-discover/eureka-in-action.md‎

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@RestController
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publicclassApplication {
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@RequestMapping("/")
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@RequestMapping("/hello")
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publicStringhome() {
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return"Hello world";
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}
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##运行
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分别在 8081 和 8082 上启动了客户端示例。可以在 Eureka Server 上看到这两个实体的信息。
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分别在 8081 和 8082 上启动了客户端示例。
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```java
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java-jar micro-weather-eureka-client-1.0.0.jar--server.port=8081
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java-jar micro-weather-eureka-client-1.0.0.jar--server.port=8082
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```
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可以在 Eureka Server 上看到这两个实体的信息。
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![eurake-client](../../images/register-discover/eurake-client.jpg)
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‎samples/micro-weather-eureka-client/src/main/java/com/waylau/spring/cloud/Application.java‎

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@RestController
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publicclassApplication {
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@RequestMapping("/")
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@RequestMapping("/hello")
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publicStringhome() {
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return"Hello world";
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}
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.gradle
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/build/
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!gradle/wrapper/gradle-wrapper.jar
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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nbproject/private/
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build/
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nbbuild/
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dist/
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nbdist/
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.nb-gradle/
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/bin/
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buildscript {
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ext {
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springBootVersion='2.0.0.M3'
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}
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repositories {
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//mavenCentral()
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maven { url"https://repo.spring.io/snapshot" }
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maven { url"https://repo.spring.io/milestone" }
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maven { url"http://maven.aliyun.com/nexus/content/groups/public/" }
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}
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dependencies {
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classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
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}
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}
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applyplugin:'java'
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applyplugin:'eclipse'
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applyplugin:'org.springframework.boot'
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applyplugin:'io.spring.dependency-management'
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version='1.0.0'
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sourceCompatibility=1.8
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repositories {
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//mavenCentral()
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maven { url"https://repo.spring.io/snapshot" }
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maven { url"https://repo.spring.io/milestone" }
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maven { url"http://maven.aliyun.com/nexus/content/groups/public/" }
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}
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ext {
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springCloudVersion='Finchley.M2'
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}
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dependencies {
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compile('org.springframework.cloud:spring-cloud-starter-netflix-eureka-client')
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compile('org.springframework.cloud:spring-cloud-starter-openfeign')
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testCompile('org.springframework.boot:spring-boot-starter-test')
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}
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dependencyManagement {
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imports {
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mavenBom"org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
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}
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}
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