From 0e7fcf059ba9ad4b07d1c8c77de511992436ceb6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=BD=97=E7=A5=A5?= <1366971433@qq.com>
Date: Fri, 18 Jan 2019 11:39:19 +0800
Subject: [PATCH] =?UTF-8?q?=E6=8F=90=E4=BA=A4README.md?=
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---
 README.md                                  |  27 +-
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 pictures/ribbon-producer.png               | Bin 0 -> 7497 bytes
 pictures/spring-cloud-ribbon.png           | Bin 0 -> 10159 bytes
 spring-cloud/spring-cloud-ribbon/README.md | 282 +++++++++++++++++++++
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 create mode 100644 pictures/ribbon-consumer.png
 create mode 100644 pictures/ribbon-producer.png
 create mode 100644 pictures/spring-cloud-ribbon.png
 create mode 100644 spring-cloud/spring-cloud-ribbon/README.md

diff --git a/README.md b/README.md
index 4a3706b..c855886 100644
--- a/README.md
+++ b/README.md
@@ -64,21 +64,20 @@ spring-cloud：Finchley.SR2
 
 <br/>
 
-## 3. spring-cloud samples
+## 3. spring-cloud  samples
 
-| samples                                                      | 描述                              | 官方文档                                                     |
-| ------------------------------------------------------------ | --------------------------------- | ------------------------------------------------------------ |
-| [spring-cloud-Eureka](https://github.com/heibaiying/spring-samples-for-all/tree/master/spring-cloud/spring-cloud-eureka) | 服务的注册和发现                  | [Service Discovery: Eureka Clients](https://cloud.spring.io/spring-cloud-static/spring-cloud-netflix/2.1.0.RC3/single/spring-cloud-netflix.html#_service_discovery_eureka_clients) |
-| [spring-cloud-Eureka-cluster](https://github.com/heibaiying/spring-samples-for-all/tree/master/spring-cloud/spring-cloud-eureka-cluster) | eureka 高可用集群搭建             |                                                              |
-| spring-cloud-Ribbon                                          | 客户端负载均衡                    |                                                              |
-| spring-cloud-OpenFeign                                       | 声明式服务调用                    | [Spring Cloud OpenFeign 官方文档](https://spring.io/projects/spring-cloud-openfeign#learn) |
-| spring-cloud-Hystrix                                         | 服务容错与降级保护                |                                                              |
-| spring-cloud-config                                          | 分布式配置中心                    | [Spring Cloud Config](https://spring.io/projects/spring-cloud-config#learn) |
-| spring-cloud-stream                                          | spring cloud 对消息服务的抽象整合 | [spring-cloud-stream官方文档](https://cloud.spring.io/spring-cloud-stream/) |
-| spring-cloud-zuul                                            | spring cloud 网关服务             | [Router and Filter: Zuul](http://projects.spring.io/spring-cloud/spring-cloud.html#_router_and_filter_zuul) |
-| spring-cloud-sleuth-Zipkin                                   | 分布式服务追踪                    | [Spring Cloud Sleuth](https://spring.io/projects/spring-cloud-sleuth#learn) |
-| spring-cloud-config                                          | 分布式配置中心                    | [Spring Cloud Config](https://spring.io/projects/spring-cloud-config#learn) |
-| spring-cloud -bus                                            | spring cloud 消息总线             |                                                              |
+| samples                                                      | 描述                               | 官方文档                                                     |
+| ------------------------------------------------------------ | ---------------------------------- | ------------------------------------------------------------ |
+| spring-cloud                                                 | 微服务简介与用例说明               |                                                              |
+| [spring-cloud-Eureka](https://github.com/heibaiying/spring-samples-for-all/tree/master/spring-cloud/spring-cloud-eureka) | 服务的注册和发现                   | [Service Discovery: Eureka Clients](https://cloud.spring.io/spring-cloud-static/spring-cloud-netflix/2.1.0.RC3/single/spring-cloud-netflix.html#_service_discovery_eureka_clients) |
+| [spring-cloud-Eureka-cluster](https://github.com/heibaiying/spring-samples-for-all/tree/master/spring-cloud/spring-cloud-eureka-cluster) | eureka 高可用集群搭建              |                                                              |
+| spring-cloud-Ribbon                                          | RestTemplate的使用、客户端负载均衡 | [ribbon](http://cloud.spring.io/spring-cloud-netflix/multi/multi_spring-cloud-ribbon.html) |
+| spring-cloud-OpenFeign                                       | 声明式服务调用                     | [Spring Cloud OpenFeign 官方文档](https://spring.io/projects/spring-cloud-openfeign#learn) |
+| spring-cloud-Hystrix                                         | 熔断器                             |                                                              |
+| spring-cloud-zuul                                            | 网关服务                           | [Router and Filter: Zuul](http://projects.spring.io/spring-cloud/spring-cloud.html#_router_and_filter_zuul) |
+| spring-cloud-sleuth-Zipkin                                   | 分布式系统服务追踪                 | [Spring Cloud Sleuth](https://spring.io/projects/spring-cloud-sleuth#learn) |
+| spring-cloud-config-bus                                      | 配置中心 + 消息总线实现配置热更新  | [Spring Cloud Config](https://spring.io/projects/spring-cloud-config#learn) |
+| spring-cloud-stream                                          | spring cloud 对消息服务的抽象整合  | [spring-cloud-stream官方文档](https://cloud.spring.io/spring-cloud-stream/) |
 
 <br/>
 
diff --git a/pictures/ribbon-consumer.png b/pictures/ribbon-consumer.png
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diff --git a/spring-cloud/spring-cloud-ribbon/README.md b/spring-cloud/spring-cloud-ribbon/README.md
new file mode 100644
index 0000000..b748975
--- /dev/null
+++ b/spring-cloud/spring-cloud-ribbon/README.md
@@ -0,0 +1,282 @@
+# spring-cloud-ribbon
+
+## 一、ribbon 简介
+
+ribbon是Netfix公司开源的负载均衡组件，采用服务端负载均衡的方式，即消费者客户端维护可用的服务列表，并通过负载均衡的方式将请求按照指定的策略分摊给消费者，从而达到负载均衡的方式。
+
+
+
+## 二、项目结构
+
++ common: 公共的接口和实体类；
++ consumer: 服务的消费者，采用RestTemplate调用产品服务；
++ producer：服务的提供者；
++ eureka: 注册中心，ribbon 从注册中心获取可用的服务列表，是实现负载均衡的基础。这里使用我们在[服务的注册与发现](https://github.com/heibaiying/spring-samples-for-all/tree/master/spring-cloud/spring-cloud-eureka)这个用例中搭建的简单注册中心作为测试即可。
+
+<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-cloud-ribbon.png"/> </div>
+
+
+
+## 三、服务提供者的实现
+
+#### 3.1 产品服务由`ProductService`提供，并通过`ProducerController`将服务暴露给外部调用。
+
+<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/ribbon-producer.png"/> </div>
+
+ProductService.java：
+
+```java
+/**
+ * @author : heibaiying
+ * @description : 产品提供接口实现类
+ * 这里为了之后直观的看到负载均衡的结果，我们继承了 ApplicationListener,从 WebServerInitializedEvent 获取服务的端口号，并拼接在产品名称上
+ */
+@Service
+public class ProductService implements IProductService, ApplicationListener<WebServerInitializedEvent> {
+
+    private static List<Product> productList = new ArrayList<>();
+
+    public Product queryProductById(int id) {
+        for (Product product : productList) {
+            if (product.getId() == id) {
+                return product;
+            }
+        }
+        return null;
+    }
+
+    public List<Product> queryAllProducts() {
+        return productList;
+    }
+
+    @Override
+    public void saveProduct(Product product) {
+        productList.add(product);
+    }
+
+    @Override
+    public void onApplicationEvent(WebServerInitializedEvent event) {
+        int port = event.getWebServer().getPort();
+        for (long i = 0; i < 20; i++) {
+            productList.add(new Product(i, port + "产品" + i, i / 2 == 0, new Date(), 66.66f * i));
+        }
+    }
+}
+```
+
+ProducerController.java：
+
+```java
+@RestController
+public class ProducerController {
+
+    @Autowired
+    private IProductService productService;
+
+    @GetMapping("products")
+    public List<Product> productList() {
+        return productService.queryAllProducts();
+    }
+
+    @GetMapping("product/{id}")
+    public Product productDetail(@PathVariable int id) {
+        return productService.queryProductById(id);
+    }
+
+    @PostMapping("product")
+    public void save(@RequestBody Product product) {
+        productService.saveProduct(product);
+    }
+}
+```
+
+#### 3.2 将服务注册到注册中心
+
+```java
+server:
+  port: 8020
+# 指定服务命名
+spring:
+  application:
+    name: producer
+# 指定注册中心地址
+eureka:
+  client:
+    serviceUrl:
+      defaultZone: http://localhost:8010/eureka/
+```
+
+
+
+## 四、服务消费者的实现
+
+<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/ribbon-consumer.png"/> </div>
+
+#### 4.1 导入负载均衡需要的依赖
+
+```xml
+<!--ribbon 依赖-->
+<dependency>
+    <groupId>org.springframework.cloud</groupId>
+    <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
+</dependency>
+```
+
+#### 4.2 指定注册中心的地址
+
+```java
+server:
+  port: 8080
+# 指定服务命名
+spring:
+  application:
+    name: consumer
+# 指定注册中心地址
+eureka:
+  client:
+    serviceUrl:
+      defaultZone: http://localhost:8010/eureka/
+```
+
+#### 4.3 使用@LoadBalanced配置RestTemplate即可实现客户端负载均衡
+
+```java
+import org.springframework.cloud.client.loadbalancer.LoadBalanced;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.client.RestTemplate;
+
+@Configuration
+public class RibbonConfig {
+
+    @LoadBalanced   // 配置客户端负载均衡
+    @Bean
+    public RestTemplate restTemplate() {
+        return new RestTemplate();
+    }
+}
+```
+
+#### 4.4 使用RestTemplate调用远程服务
+
+这里我们在调用远程服务的时候，url填写的是服务名+具体接口地址 ，由于我们的同一个服务会存在多个实例，在使用@LoadBalanced配置RestTemplate调用服务时，客户端就会从按照指定的负载均衡的方式将请求分摊到多个实例上。（默认的负载均衡采用的是RoundRobinRule（轮询）的策略，有特殊需求时候可以采用其他内置的策略规则，或者实现IRule来定义自己的负载均衡策略）。
+
+```java
+@Service
+public class ProductService implements IProductService {
+
+    @Autowired
+    private RestTemplate restTemplate;
+
+    public Product queryProductById(int id) {
+        ResponseEntity<Product> responseEntity = restTemplate.getForEntity("http://producer/product/{1}", Product.class, id);
+        return responseEntity.getBody();
+    }
+
+
+    public List<Product> queryAllProducts() {
+        ResponseEntity<List> responseEntity = restTemplate.getForEntity("http://producer/products", List.class);
+        List<Product> productList = responseEntity.getBody();
+        return productList;
+    }
+
+    public void saveProduct(Product product) {
+        restTemplate.postForObject("http://producer/product", product, Void.class);
+    }
+}
+
+```
+
+
+
+## 五、启动测试
+
+#### 5.1 启动一个Eureka服务、三个producer服务（注意区分端口）、和一个消费者服务
+
+<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-cloud-ribbon-app.png"/> </div>
+
+**服务注册中心：**
+
+<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-cloud-ribbon-eureka.png"/> </div>
+
+#### 5.2  访问http://localhost:8080/sell/products 查看负载均衡的调用结果
+
+<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-cloud-ribbon-products-8020.png"/> </div>
+
+<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-cloud-ribbon-products-8030.png"/> </div>
+
+## 六、 附1： 关于RestTemplate的说明
+
+#### 6.1 restTemplate 调用对应resultful接口时候，使用的方法应该与接口声明方式（@GetMapping、@PostMapping、@PutMapping、@DeleteMapping）保持一致。请求类型与对应的调用方法如下。
+
+- GET请求(getForObject 、getForEntity)
+- POST请求（postForObject 、postForEntity）
+- PUT请求（put）
+- DELETE请求 （delete）
+
+#### 6.2 ForEntity()和ForObject的区别
+
+- `ForEntity()`发送一个请求，返回的ResponseEntity包含了响应体所映射成的对象
+
+- `ForObject()`发送一个请求，返回的请求体将映射为一个对象
+
+例如：
+
+```java
+ResponseEntity<Product> responseEntity = restTemplate.getForEntity("http://producer/product/{1}", Product.class, id);
+        Product product = restTemplate.getForObject("http://producer/product/{1}", Product.class, id);
+```
+
+
+
+## 七、 附2： 关于ribbon更多负载均衡的策略
+
+Ribbon内置了多种负载均衡策略，如果有更复杂的需求，可以自己实现IRule。
+
+#### 7.1 内置的负载均衡的策略如下图
+
+![Ribbon负载均衡策略.png](http://upload-images.jianshu.io/upload_images/6944619-0355d316f5df9b3f.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
+
+图片来源于博客：[Ribbon负载均衡策略与自定义配置](https://blog.csdn.net/jrn1012/article/details/77837680)
+
+
+
+#### 7.2 配置文件指定负载均衡的方式
+
+要设置`IRule`名为的服务名称`users`，您可以设置以下属性：
+
+```yaml
+users:
+  ribbon:
+    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.WeightedResponseTimeRule
+```
+
+
+
+#### 7.3 代码指定负载均衡的方式
+
+```java
+@Configuration
+@RibbonClient(name = "custom", configuration = CustomConfiguration.class)
+public class TestConfiguration {
+}
+```
+
+```java
+@Configuration
+public class CustomConfiguration {
+
+	@Bean
+	public IRule ribbonRule() {
+		return new BestAvailableRule();
+	}
+}
+```
+
+在使用代码方式的时候需要注意 [官方文档](http://cloud.spring.io/spring-cloud-netflix/multi/multi_spring-cloud-ribbon.html#_customizing_the_ribbon_client)中关于注解方式有以下强调：
+
+```properties
+The CustomConfiguration clas must be a @Configuration class, but take care that it is not in a @ComponentScan for the main application context. Otherwise, it is shared by all the @RibbonClients. If you use @ComponentScan (or @SpringBootApplication), you need to take steps to avoid it being included (for instance, you can put it in a separate, non-overlapping package or specify the packages to scan explicitly in the @ComponentScan).
+```
+
+该`CustomConfiguration`类必须是`@Configuration`标注的，但需要注意的它不是在`@ComponentScan`主应用程序上下文。否则，它将由所有`@RibbonClients`共享。如果你使用`@ComponentScan`（或`@SpringBootApplication`），你需要采取一些措施来避免它被扫描到（例如，你可以把它放在一个独立的，非重叠的包，或用`@ComponentScan`时显示扫描指定的包）。
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