Docker Swarm + SpringCloud（二）编写SpringCloud项目

版本

spring-boot：2.1.1.RELEASE
spring-cloud：Finchley.SR2

项目目录

├─swarm-cloud-----------------------------父项目，公共依赖
│  │
│  ├─discovery-----------------------------微服务注册中心
│  │
│  ├─provider-api
│  │  │
│  │  └─provider-user-api------------------用户服务API
│  │
│  ├─provider
│  │  │
│  │  ├─provider-user----------------------用户服务
│  │  │
│  │  └─provider-order---------------------订单服务

代码结构

swarm-cloud：父项目，只有一个pom文件

    4.0.0

    com.mario
    swarm-cloud
    0.0.1-SNAPSHOT
    pom
    
        discovery
        provider-api
        provider
    

    
        org.springframework.boot
        spring-boot-starter-parent
        2.1.1.RELEASE
    

    
        UTF-8
        UTF-8
        1.8
        1.18.4
        Finchley.SR2
    

    
        
            
                org.springframework.cloud
                spring-cloud-dependencies
                ${spring-cloud.version}
                pom
                import
            
        
    

    
        
            org.projectlombok
            lombok
            ${lombok.version}
        
    

discovery：微服务注册中心

• pom.xml

    4.0.0

    
        com.mario
        swarm-cloud
        0.0.1-SNAPSHOT
    

    discovery
    discovery

    
        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-server
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

• application.yml

spring:
  application:
    name: discovery
server:
  port: 8761
eureka:
  client:
    fetch-registry: false
    register-with-eureka: false
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

• DiscoveryApplication.java

@EnableEurekaServer
@SpringBootApplication
public class DiscoveryApplication {

    public static void main(String[] args) {
        SpringApplication.run(DiscoveryApplication.class, args);
    }
}

provider-user-api：定义用户服务的接口，只是一个普通的jar，所以不需要SpringBoot启动

• pom.xml

    
        provider-api
        com.mario
        0.0.1-SNAPSHOT
    
    4.0.0
    jar
    provider-user-api

    
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        
    

• UserService.java：定义一个接口，@FeignClient用于让其他微服务调用

@FeignClient("provider-user")
public interface UserService {
    
    /**
     * 根据ID获取用户信息
     */
    @ResponseBody
    @GetMapping("users/{id}")
    UserDTO getUser(@PathVariable(value = "id") Long id);
}

• UserDTO.java：封装用户信息用户转换成JSON传输

@Data
public class UserDTO {

    private Long id;
    private String name;
    private String mobile;
    private LocalDateTime createTime;

}

provider：服务提供者父模块

• pom.xml

    swarm-cloud
    com.mario
    0.0.1-SNAPSHOT

4.0.0
provider
pom

    provider-user
    provider-order


    
        
            org.springframework.boot
            spring-boot-maven-plugin
        
    

provider-user：用户服务提供者，引用provider-user-api模块

• pom.xml

    provider
    com.mario
    0.0.1-SNAPSHOT

4.0.0
provider-user

    
        org.springframework.cloud
        spring-cloud-starter-netflix-eureka-client
    
    
        com.mario
        provider-user-api
        0.0.1-SNAPSHOT
    

• UserServiceImpl.java：实现UserService接口，本质是一个restful接口

@RestController
public class UserServiceImpl implements UserService {

    @Override
    public UserDTO getUser(Long id) {
        UserDTO dto = new UserDTO();
        dto.setId(id);
        dto.setName("mario");
        dto.setMobile("18768101234");
        dto.setCreateTime(LocalDateTime.now());
        return dto;
    }
}

UserApplication.java

@ComponentScan("com.mario.provider")
@SpringBootApplication
public class UserApplication {
    public static void main(String[] args) {
        SpringApplication.run(UserApplication.class, args);
    }
}

• application.yml

spring:
  application:
    name: provider-user
server:
  port: 8762
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

provider-order：订单服务提供者，需要引用provider-user-api模块

• pom.xml

    provider
    com.mario
    0.0.1-SNAPSHOT

4.0.0
provider-order

    
        com.mario
        provider-user-api
        0.0.1-SNAPSHOT
    
    
        org.springframework.cloud
        spring-cloud-starter-netflix-eureka-client
    

• OrderController.java

@RestController
public class OrderController {

    @Autowired
    private UserService userService;

    @GetMapping("/orders/users/{userId}")
    public UserDTO getUser(@PathVariable Long userId) {
        return userService.getUser(userId);

    }
}

• OrderApplication.java

@ComponentScan("com.mario.provider")
@SpringBootApplication
@EnableFeignClients(basePackages = "com.mario.provider")
public class OrderApplication {
    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }
}

• application.yml

spring:
  application:
    name: provider-order
server:
  port: 8763
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

本地运行测试

依次启动discovery，provider-user，provider-order
访问 http://localhost:8761/，可以看到两个服务都已经注册成功

• 

  image.png

访问 http://localhost:8763/orders/users/1，可以看到成功获取了用户信息

• 

  image.png

下一篇 Docker Swarm + SpringCloud（三）构建镜像并推送到远程仓库