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

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

返回

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

返回

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

Spring

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

返回

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

zhudeming-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 {
    @Override
    public 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 {
  ……
    @Override
    public 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);

    @Override
    public 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-CONFIG
  application:
    name: sc-configserver

代码地址

microservice-skeleton, tag: finchley.sr4

参考资料

重新定义 Spring Cloud 实战