spring-cloud | 易学教程

12.Spring-Cloud-Feign初探

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在微服务架构中客户端负载均衡和断路器保护，作为基础工具类框架广泛的应用在各个微服务的实现中，不仅包括我们自身的业务服务类，也包括一些基础设施类微服务，那么是否有更高层次的封装来整合这两个基础工具以简化开发。 Feign是Netflix开发的声明式、模板化的HTTP客户端，Netflix Feign整合了Spring Cloud Ribbon与Spring Cloud Hystrix，除了提供这两者强大功能之外，它还提供了一种声明式的web服务端定义方式。在Spring Cloud中使用Feign非常简单，只需创建一个接口，并在接口上添加一个注解代码就完成了。Feign支持多种注解，如Fegin自带注解或者JAX-RS注解等。 Spring Cloud对Feign进行了增强，使用Feign支持了Spring MVC注解，并整合了Ribbon和Eureka,从而上Feign的使用更加方便。注册中心注册中心之前的博文已经实现，不在过多强调服务提供者修改controller /** * 不接收参数 * @return */ @RequestMapping(value = "/hello1", method = RequestMethod.GET) public String hello() { return "hello spring cloud"; } /** * 接收单个参数

Timeout Exception in Zuul based routing

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问题 I have got the below setup in which my Eureka server is running and few services created and registered with Eureka are running. All the service to service calls are happing using rest template which has been load balanced and every thing is working fine. Now, I have introduced the Zuul based routing to the application with below code/properties - @SpringBootApplication @EnableZuulProxy public class ApiGatewayApplication { public static void main(String[] args) { SpringApplication.run

Timeout Exception in Zuul based routing

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org.eclipse.jgit.api.errors.InvalidRemoteException: Invalid remote: origin - Spring Cloud

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问题 I am working on Spring Boot Cloud using GIT. Using Spring Boot 2.2.2.RELEASE version. SpringBootCloudChap2ConfigServerGitApplication.java @SpringBootApplication @EnableConfigServer @EnableAutoConfiguration public class SpringBootCloudChap2ConfigServerGitApplication { public static void main(String[] args) { SpringApplication.run(SpringBootCloudChap2ConfigServerGitApplication.class, args); } } application.properties server.port=8888 spring.cloud.config.server.git.uri=https://github.com

Spring Cloud service Look up error: Load balancer does not have available server for client

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问题 I've been playing with a Spring Cloud app consisting of a config server, a discovery server (Eureka) and a Feign client with Ribbon (internally used by Feign). I've 2 services, a movie-service and a daily-update-service . The intent is to provide a daily update of popular movies, news and weather in one place. Problem I'm having is that the movie-service Feign client is not able to find it from daily-update-service . It errors out with the following: Caused by: java.lang.RuntimeException: com

Spring Cloud service Look up error: Load balancer does not have available server for client

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Spring Cloud Alibaba Nacos

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1. Spring Cloud Alibaba 介绍 Spring Cloud Alibaba 为分布式应用程序开发提供了一站式解决方案。它包含了开发分布式应用程序所需的所有组件，使得你可以轻松地使用Spring Cloud开发应用程序。使用Spring Cloud Alibaba，只需要添加一些注释和少量配置即可将Spring Cloud应用程序连接到Alibaba的分布式解决方案，并使用Alibaba中间件构建分布式应用程序系统。特性：流量控制和服务降级：Sentinel进行流量控制，断路和系统自适应保护。服务注册和发现：实例可以在Nachos中注册，并且客户端可以使用Spring管理的Bean发现实例。支持Ribbon。分布式配置：使用Nacos作为数据存储。事件驱动：建立与Spring Cloud Stream RocketMQ Binder连接的高度可扩展的事件驱动型微服务。消息总线：利用Spring Cloud Bus RocketMQ链接分布式系统的节点。分布式事务：支持高性能、易于使用的分布式事务。 Dubbo RPC ：通过Dubbo RPC扩展Spring Cloud服务之间调用的通信协议。阿里云对象存储：阿里云对象存储服务（OSS）是一种加密、安全、经济高效且易于使用的对象存储服务，可让您在云中存储，备份和存档大量数据。

Spring Data Pageable not supported as RequestParam in Feign Client

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问题 I have been trying to expose a Feign Client for my rest api. It takes Pageable as input and has PageDefaults defined. Controller: @GetMapping(value = "data", produces = MediaType.APPLICATION_JSON_VALUE) @ApiOperation(value = "Get Data", nickname = "getData") public Page<Data> getData(@PageableDefault(size = 10, page = 0) Pageable page, @RequestParam(value = "search", required = false) String search) { return service.getData(search, page); } And here is my feign client: @RequestMapping(method

How to make Zuul dynamic routing based on HTTP method and resolve target host by 'serviceId'?

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问题 How to make Zuul dynamic routing based on HTTP method (GET/POST/PUT...)? For example, when you need to route the POST request to the different host instead of the default one described in ' zuul.routes.* '... zuul: routes: first-service: path: /first/** serviceId: first-service stripPrefix: false second-service: path: /second/** serviceId: second-service stripPrefix: false I.e. when we request ' GET /first ' then Zuul route the request to the ' first-service ', but if we request ' POST /first

springcloud之Ribbon负载均衡及Feign消费者调用服务

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springcloud之Ribbon负载均衡及Feign消费者调用服务 1、简单了解Ribbon 微服务调用Ribbon 2、Ribbon负载均衡 Ribbon负载均衡 3、Feign简介及应用 1、简单了解Ribbon Ribbon是Netflix发布的负载均衡器，它有助于控制HTTP和TCP的客户端的行为。为Ribbon配置服务提供者地址后，Ribbon就可基于某种负载均衡算法，自动地帮助服务消费者去请求。Ribbon默认为我们提供了很多负载均衡算法，例如轮询、随机等。当然，我们也可为Ribbon实现自定义的负载均衡算法。在Spring Cloud中，当Ribbon与Eureka配合使用时，Ribbon可自动从Eureka Server获取服务提供者地址列表，并基于负载均衡算法，请求其中一个服务提供者实例。展示了Ribbon与Eureka配合使用时的架构。微服务调用Ribbon 用到Ribbon，结合eureka，来实现服务的调用；初步应用 Ribbon是客户端负载均衡，所以肯定集成再消费端，也就是consumer端我们修改microservice-student-consumer-80 首先，引入依赖，pom.xml 加入 ribbon相关依赖  <dependency> <groupId>org.springframework

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