目的
配置客户端，使其能够得到使得其可以从配置服务器上获取版本信息。
改造视图微服务-feign
直接将前面的一个视图微服务进行改造。
pom.xml
添加spring-cloud-starter-config 用于访问配置服务器
<?xml version="1.0" encoding="UTF-8"?> <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"> <parent> <artifactId>springcloud</artifactId> <groupId>edu.hpu.springcloud</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>product-view-service-feign</artifactId> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> <!--对feign方式的支持--> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-zipkin</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId> </dependency> </dependencies> </project>
bootstrap.yml
与 Spring Cloud Config （配置）相关的属性必须配置在 bootstrap.yml 中，config 部分内容才能被正确加载。因为 config 的相关配置会先application.yml，而 bootstrap.yml 的加载也是先于 application.yml。
spring: cloud: config: label: master profile: dev discovery: enabled: true serviceId: config-server client: serviceUrl: defaultZone: http://localhost:8761/eureka/
application.yml
变化不大，把注册中心交给了bootstrap.yml,
spring: application: name: product-view-service-feign thymeleaf: cache: false prefix: classpath:/templates/ suffix: .html encoding: UTF-8 content-type: text/html mode: HTML5 zipkin: base-url: http://localhost:9411
ProductController
用@Value获取配置中version的值，并放入Model,
package edu.hpu.springcloud.controller; import edu.hpu.springcloud.pojo.Product; import edu.hpu.springcloud.service.ProductService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import java.util.List; @Controller public class ProductController { @Autowired ProductService productService; @Value("${version}") String version; @RequestMapping("/products") public Object products(Model m){ List<Product> ps=productService.listProducts(); m.addAttribute("version", version); m.addAttribute("ps",ps); return "products"; } }
product.html
product.html添加对version的显示，
<!DOCTYPE HTML> <html xmlns:th="http://www.thymeleaf.org"> <head> <title>products</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <style> table { border-collapse:collapse; width:400px; margin:20px auto; } td,th{ border:1px solid gray; } </style> </head> <body> <div class="workingArea"> <table> <thead> <tr> <th>id</th> <th>产品名称</th> <th>价格</th> </tr> </thead> <tbody> <tr th:each="p: ${ps}"> <td th:text="${p.id}"></td> <td th:text="${p.name}"></td> <td th:text="${p.price}"></td> </tr> </tbody> <tr> <td align="center" colspan="3"> <p th:text="${version}" >LaughterYoung springcloud version unknown</p> </td> </tr> </table> </div> </body> </html>
跑一下，访问
依次运行注册中心、配置服务、数据服务、视图服务，访问：http://localhost:8012/products
错误
1、version注入失败
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'productController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'version' in value "${version}"
1.1、先去看看bootstrap.yml中配置serviceId和注册的服务器名字是否一致，这个没有问题。
1.2、检查pom.xml包中是否添加了config jar包，没有问题。
1.3、修改gitee中项目配置文件名字，原名product-view-service-dev.properties 改为product-view-service-feign.properties
OK，解决了，懵逼来，懵逼去。
参考：
【1】、http://how2j.cn/k/springcloud/springcloud-config-client/2048.html
【2】、https://windmt.com/2018/04/19/spring-cloud-7-config-sample/
