基于 Spring Cloud 的微服务脚手架

作者： Grey

原文地址：

博客园：基于 Spring Cloud 的微服务脚手架

CSDN：基于 Spring Cloud 的微服务脚手架

本文主要介绍了基于 Spring Cloud Finchley 和 Spring Boot 2.0.x 版本的微服务脚手架的搭建和关键代码说明，参考了重新定义 Spring Cloud 实战。

相关组件和版本

组件	版本	备注
Spring Boot	2.0.9.RELEASE	-
Spring Cloud	Finchley.SR4	-
JDK	1.8	高于JDK 1.8会有兼容性问题
Eureka	基于 Spring Cloud F 版	注册中心
Zuul	基于 Spring Cloud F 版	网关
hystrix	基于 Spring Cloud F 版	熔断器
Spring Cloud Config	基于 Spring Cloud F 版	配置中心
Spring Cloud OpenFeign	基于 Spring Cloud F 版	用于服务之间的通讯，使用 HTTP 协议

架构图如下

启动方式，按如下顺序启动

skeleton-eureka-server
skeleton-config-server
skeleton-zuul-server
skeleton-hystrix-dashboard
skeleton-user-service
skeleton-data-service

测试三个请求，需要带上x-customs-user参数，否则会被拦截器拦截提示无权限。

GET http://localhost:7777/sc-user-service/getProviderData
Accept: application/json
x-customs-user: Spring

HTTP/1.1 200 
Date: Sat, 17 Dec 2022 11:09:48 GMT
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunked["Beijing Company","Shanghai Company","Shenzhen Company"
]

GET http://localhost:7777/sc-user-service/getContextUserId
Accept: application/json
x-customs-user: Spring

HTTP/1.1 200 
Date: Sat, 17 Dec 2022 11:09:29 GMT
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunkedSpring

GET http://localhost:7777/sc-user-service/getDefaultUser
Accept: application/json
x-customs-user: Spring

HTTP/1.1 200 
Date: Sat, 17 Dec 2022 11:08:54 GMT
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunkedzhudeming-dev

核心代码说明
上述三个方法在成功调用之前，都需要做鉴权逻辑

用户鉴权部分，实现HandlerInterceptor即可，在preHandle中处理鉴权逻辑


public class UserContextInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse respone, Object arg2) throws Exception {User user = new User(HttpConvertUtil.httpRequestToMap(request));if (StringUtils.isEmpty(user.getUserId()) && StringUtils.isEmpty(user.getUserName())) {log.error("the user is null, please access from gateway or check user info");return false;}UserContextHolder.set(user);return true;}
……
}

上述三个请求分别代表三种不同的逻辑处理方式，第一个请求首先是到 sc-user-service 服务，sc-user-service 通过 RestTemplate 方式直接调用 data-service 服务，核心代码如下


@Component
public class UserService implements IUserService {……@Overridepublic List<String> getProviderData() {List<String> result = restTemplate.getForObject("http://sc-data-service/getProviderData", List.class);return result;}
}

第二个方法getContextUserId是获取当前上下文用户，使用的是 Spring Cloud 自带的 Feign 客户端，请求 data-service，Feign 请求会被拦截，并把当前用户存在 ThreadLocal 中， data-service 从ThreadLocal 中拿到当前用户信息返回即可，核心代码如下

public class UserContextInterceptor implements HandlerInterceptor {private static final Logger log = LoggerFactory.getLogger(UserContextInterceptor.class);@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse respone, Object arg2) throws Exception {User user = new User(HttpConvertUtil.httpRequestToMap(request));if (StringUtils.isEmpty(user.getUserId()) && StringUtils.isEmpty(user.getUserName())) {log.error("the user is null, please access from gateway or check user info");return false;}// 存当前用户UserContextHolder.set(user);return true;}
}

其中UserContextHolder.set(user)就是把当前用户存在ThreadLocal中。

public class UserContextHolder {public static ThreadLocal<User> context = new ThreadLocal<User>();public static User currentUser() {return context.get();}public static void set(User user) {context.set(user);}public static void shutdown() {context.remove();}}

第三个方法getDefaultUser同样是 sc-user-service 通过 Feign 客户端访问 data-service，但是用户是通过配置中心来获取（即：skeleton-config-server 项目作用）

@Component
@ConfigurationProperties(prefix = "cn.springcloud.book")
public class DataConfig {private String defaultUser;public String getDefaultUser() {return defaultUser;}public void setDefaultUser(String defaultUser) {this.defaultUser = defaultUser;}}

server:port: 9090
spring:cloud:config:server:git:uri: https://gitee.com/zhudeming/spring-cloud-config.git#username:#password:search-paths: SC-BOOK-CONFIGapplication:name: sc-configserver