接父子工程项目搭建,继续扩展项目
重新调整模块结构
1.删除子模块fast-demo-web
中所有无用内容
2.右键fast-demo-web
名称->新建(news)->模块(Module),创建新的子模块
3.选择新建Maven工程
4.新建模块fast-demo-controller
,注意:父项选择fast-demo-web
而不是fast-demo
5.重复操作创建fast-demo-service
、fast-demo-dao
模块
fast-demo-controller
:专注写控制层代码,负责提供接口给前端对接fast-demo-service
:专注写业务逻辑代码fast-demo-dao
:专注处理数据,负责与数据库交互
简单实现数据库操作
1.每个子模块都新建对应的目录,如控制层增加controller
目录存放控制层文件
2.添加MySQL和MyBatis-plus依赖
这里我们在fast-demo-web
模块中的pom.xml
里添加依赖而不是父工程
<!--引入mybatisPlus 包含了 jdbc-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
</dependency>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
子工程添加依赖不写版本,版本写在父工程的pom.xml
,统一管理
<dependencyManagement>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.5.2</version>
</dependency>
</dependencyManagement>
重新加载Maven后,三个子工程都会有MySQL和MyBatis-plus依赖包,但父工程没有
3.配置application.yml
在fast-demo-controller
模块中的resources
目录下新建application.yml
,并增加数据库连接和MyBatis配置
# 数据库连接配置,记得新建一个数据库
spring:
datasource:
url: jdbc:mysql://localhost:3306/my_demo?useUnicode=true&characterEncoding=UTF-8
driver-class-name: com.mysql.cj.jdbc.Driver
username: root
password: 123456
mybatis-plus:
# 指定 Mapper XML 文件的位置,使用 classpath 通配符指定路径
mapper-locations: classpath:/mapper/**/*.xml
# 指定实体类的包路径,用于自动扫描并注册类型别名
type-aliases-package: com.cyfy.springboot_one.pojo
global-config:
db-config:
id-type: input
# 驼峰下划线转换(将数据库字段的下划线命名规则转换为 Java 实体类属性的驼峰命名规则)
db-column-underline: true
# 刷新 mapper
refresh-mapper: true
configuration:
# 将 Java 实体类属性的驼峰命名规则转换为数据库字段的下划线命名规则
map-underscore-to-camel-case: true
# 查询结果中包含空值的列,在映射的时候,不会映射这个字段
call-setters-on-nulls: true
# 开启 sql 日志
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
# 关闭 sql 日志
# log-impl: org.apache.ibatis.logging.nologging.NoLoggingImpl
4.引用其他模块类
当我们需要引用其他模块的类时,需要在pom.xml
中引入其他模块依赖,如service需要调用dao模块的方法,则需要在pom.xml
中添加下如下代码
<dependencies>
<dependency>
<groupId>com.cyfy</groupId>
<artifactId>fast-demo-dao</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
添加后,我们就可以在service
模块中导入dao
模块的类
同理,controller
模块需要导入service
模块的类,所以controller
模块中的pom.xml
需要添加如下代码
<dependencies>
<dependency>
<groupId>com.cyfy</groupId>
<artifactId>fast-demo-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
</dependencies>
注:虽然controller
模块只引用了service
模块,但因为service
模块引用了dao
模块,所以controller
模块也能直接使用dao
模块的类
项目结构
fast-demo-web
模块
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>fast-demo</artifactId>
<groupId>com.cyfy</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>fast-demo-web</artifactId>
<packaging>pom</packaging>
<modules>
<module>fast-demo-controller</module>
<module>fast-demo-service</module>
<module>fast-demo-dao</module>
</modules>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<!--引入mybatisPlus 包含了 jdbc-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
</dependency>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
</dependencies>
</project>
fast-demo-controller
模块
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>fast-demo-web</artifactId>
<groupId>com.cyfy</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>fast-demo-controller</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.cyfy</groupId>
<artifactId>fast-demo-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>
UserController
@RestController
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("/user")
public List<User> user(){
List<User> users = userService.getUserList();
return users;
}
}
FastDemoApplication
@SpringBootApplication
public class FastDemoApplication {
public static void main(String[] args) {
SpringApplication.run(FastDemoApplication.class,args);
}
}
fast-demo-service
模块
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>fast-demo-web</artifactId>
<groupId>com.cyfy</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>fast-demo-service</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.cyfy</groupId>
<artifactId>fast-demo-dao</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>
UserService
public interface UserService {
List<User> getUserList();
}
UserServiceImpl
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public List<User> getUserList() {
return userMapper.selectList(null);
}
}
fast-demo-dao
模块
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>fast-demo-web</artifactId>
<groupId>com.cyfy</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>fast-demo-dao</artifactId>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
</project>
UserMapper
@Mapper
public interface UserMapper extends BaseMapper<User> {
}
父工程fast-demo
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.cyfy</groupId>
<artifactId>fast-demo</artifactId>
<packaging>pom</packaging>
<version>0.0.1-SNAPSHOT</version>
<modules>
<module>fast-demo-web</module>
</modules>
<name>fast-demo</name>
<description>fast-demo</description>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<spring-boot.version>2.6.13</spring-boot.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.5.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${spring-boot.version}</version>
<configuration>
<mainClass>com.cyfy.fastdemo.FastDemoApplication</mainClass>
<skip>true</skip>
</configuration>
<executions>
<execution>
<id>repackage</id>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>