springcloud（1）-建立初始项目框架-实现provider

前言

用的springboot及springcloud版本都是当前官网最新，版本对应关系可官网查看

• 所讲代码仓库地址：https://gitee.com/raoyuuuu/springcloud-demo

需要的服务

• 父工程-parent，管理依赖
• 子项目-注册中心eureka
• 子项目-服务提供者provider
• 子项目-服务消费者consumer

期望

• provider工程实现查询
• 实现feign：consumer通过feign调用provider方法，实现查询
• 实现gateway：consumer通过网关调用provider方法，实现查询

实现 1.1 、创建空文件springcloud-demo

1.2、创建父工程

parent工程的意义：在服务越来越多的情况下，起到统一依赖版本的作用，不用每个服务都去改
具体看—> maven项目pom.xml中parent标签的使用

创建一个普通的maven项目即可

pom依赖

    4.0.0

    
        org.springframework.boot
        spring-boot-starter-parent
        2.5.5
         
    

    com.example
    cloud-parent
    0.0.1-SNAPSHOT
    cloud-parent
    Demo project for Spring Boot
    
    
    pom
    
    
        1.8
    

    
        
            
            
                org.springframework.cloud
                spring-cloud-dependencies
                2020.0.3
                pom
                import
            

            
            
                org.mybatis.spring.boot
                mybatis-spring-boot-starter
                2.2.0
            
            
            
                mysql
                mysql-connector-java
                8.0.15
            
            
            
                com.alibaba
                druid
                1.2.5
            

            
            
                junit
                junit
                4.13.2
            
            
            
                org.projectlombok
                lombok
                1.18.6
            
            
            
                log4j
                log4j
                1.2.17
            
            
                ch.qos.logback
                logback-core
                1.2.6
            
        
    

1.3、创建provider工程 1.3.1、创建springboot项目

1.3.2、pom依赖：这边有些依赖就可以引用父工程中的依赖了

    4.0.0

    
    
        com.example
        cloud-parent
        0.0.1-SNAPSHOT
        
    

    com.example
    cloud-provider
    0.0.1-SNAPSHOT
    cloud-provider
    Demo project for Spring Boot

    
        1.8
    
    
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
        

        
            mysql
            mysql-connector-java
        
        
            com.alibaba
            druid
        
        
            ch.qos.logback
            logback-core
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
        
        
            org.springframework.boot
            spring-boot-starter-jetty
        
        
            org.projectlombok
            lombok
        

    

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

1.3.3、application配置：配置数据库等

server:
  port: 8001


mybatis:
  type-aliases-package: com.example.entity
  mapper-locations: classpath:mapper/*.xml
  configuration:
    # 开启驼峰
    map-underscore-to-camel-case: true


spring:
  application:
    name: cloud-provider
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: 123456
    type: com.alibaba.druid.pool.DruidDataSource
    url: jdbc:mysql://localhost:3306/feather?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC

数据库

CREATE TABLE `dept` (
  `deptno` bigint NOT NULL AUTO_INCREMENT,
  `dname` varchar(32) DEFAULT NULL,
  `db_source` varchar(32) DEFAULT NULL,
  PRIMARY KEY (`deptno`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8mb3;

1.3.4、实体类Dept

@Data
public class Dept implements Serializable {

    private Integer deptno;

    private String dname;

    private String db_source;

}

1.3.5、DeptMapper

@Mapper
public interface DeptMapper {

    List list();

}

1.3.6、DeptMapper.xml

    
        select * from dept where deptno = #{no}
    

    
        select * from dept
    

1.3.7、DeptService

public interface DeptService {

    List list();

}

1.3.8、DeptServiceImpl

@Service
public class DeptServiceImpl implements DeptService {

    @Autowired
    private DeptMapper deptMapper;


    @Override
    public List list() {
        return deptMapper.list();
    }
}

1.3.9、DeptController

@RestController
@RequestMapping("dept")
public class DeptController {

    @Autowired
    private DeptService deptService;

    @GetMapping("list")
    public List list(){
        return deptService.list();
    }


}

1.3.10、CloudProviderApplication

@SpringBootApplication
public class CloudProviderApplication {

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

}

启动项目

调用接口 http://localhost:8001/dept/list

到目前为止，provider就实现了，接下来实现eureka