第二章 Maven聚合工程创建微服务项目

1.创建聚合工程 xdclass-cloud，修改pom文件
注意：记得删除聚合工程src目录

    <!-- 一般来说父级项目的packaging都为pom，packaging默认类型jar类型-->
    <packaging>pom</packaging>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.3.3.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR8</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.2.1.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                    <addResources>true</addResources>
                </configuration>
            </plugin>
        </plugins>
    </build>

2.创建4个子项目 xdclass-common、xdclass-video-service、xdclass-user-service、xdclass-order-service
3.添加子项目依赖
修改子项目xdclass-video-service、xdclass-user-service、xdclass-order-service下的pom文件

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>net.xdclass</groupId>
            <artifactId>xdclass-common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

4.Mybatis依赖导入+数据库配，创建common包实体类

public class User {
        private Integer id;
        private String name;
        private String pwd;
        private String headImg;
        private String phone;
        private Date createTime;
        private String wechat;
}
public class Video {
    private Integer id;
    private String title;
    private String summary;
    private String coverImg;
    private Integer  price;
    private Date createTime;
    private Double point;
}
public class VideoOrder {
    private Integer id;
    private String outTradeNo;
    private Integer state;
    private Date createTime;
    private  Integer totalFee;
    private Integer videoId;
    private String videoTitle;
    private String videoImg;
    private Integer userId;
}

5.聚合工程pom.xml修改

    <properties>
        <java.version>1.8</java.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

  	<dependency>
    	<groupId>org.mybatis.spring.boot</groupId>
    	<artifactId>mybatis-spring-boot-starter</artifactId>
    	<version>2.1.2</version>
    	<type>pom</type>
    	<scope>import</scope>
    </dependency>

6.添加mybatis依赖和数据库驱动

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

7.在xdclass-cloud\xdclass-video-service\src\main\resources创建application.yml
xdclass-user-service、xdclass-order-service项目下的端口及数据库名称要改成对应的

server:
  port: 9000

spring:
  application:
    name: xdclass-video-service
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/cloud_video?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
    username: root
    password: 123456

# 控制台输出sql、下划线转驼峰
mybatis:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
    map-underscore-to-camel-case: true

8.controller->service->mapper 开发

@RestController
@RequestMapping("api/v1/video")
public class VideoController {

    @Autowired
    private VideoService videoService;

    @RequestMapping("find_by_id")
    public Object findVideoById(int videoId){
        return videoService.findById(videoId);
    }
}

@Service
public class VideoServiceImpl implements VideoService {
    @Autowired
    private VideoMapper videoMapper;
    @Override
    public Video findById(int videoId) {
        return videoMapper.findById(videoId);
    }
}


@Repository
public interface VideoMapper {

    @Select("select * from video where id=#{videoId}")
    Video findById(@Param("videoId")int videoId);
}

9.启动类配置

@SpringBootApplication
@MapperScan("net.xdclass.dao")
public class VideoApplication {
    public static void main(String[] args) {
        SpringApplication.run(VideoApplication.class,args);
    }
}

10.启动服务，验证接口