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✨系列专栏：👉SpringBoot专栏
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🍁开发步骤

1.创建启动器项目

• 添加启动器相关依赖
• 创建属性配置类
• 创建自动配置类
• 编写自动配置文件(spring.factories)
• 使用自定义的启动器

🍁测试

• 创建个SpringBoot项目，导入依赖

parent>
    groupId>org.springframework.boot/groupId>
    artifactId>spring-boot-starter-parent/artifactId>
    version>2.2.2.RELEASE/version>
/parent>

properties>
    project.build.sourceEncoding>UTF-8/project.build.sourceEncoding>
    project.reporting.outputEncoding>UTF-8/project.reporting.outputEncoding>
    java.version>1.8/java.version>
/properties>

dependencies>
    !--引入spring‐boot‐starter；所有starter的基本配置-->
    dependency>
        groupId>org.springframework.boot/groupId>
        artifactId>spring-boot-starter/artifactId>
/dependency>

    !--自动配置连接池-->
    dependency>
        groupId>com.alibaba/groupId>
        artifactId>druid/artifactId>
        version>1.1.12/version>
/dependency>

    dependency>
            groupId>c3p0/groupId>
            artifactId>c3p0/artifactId>
            version>0.9.1.2/version>
/dependency>

    dependency>
        groupId>org.springframework.boot/groupId>
        artifactId>spring-boot-configuration-processor/artifactId>
        optional>true/optional>
    /dependency>
/dependencies>

• 创建属性配置类

@Component
@ConfigurationProperties(prefix = "spring.jdbc.datasource")
public class DataSourceProperties {
    private String driverClassName ;
    private String url;
    private String username;
    private String password;

    public String getDriverClassName() {
        return driverClassName;
    }

    public void setDriverClassName(String driverClassName) {
        this.driverClassName = driverClassName;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "DataSourceProperties{" +
                "driverClassName='" + driverClassName + ''' +
                ", url='" + url + ''' +
                ", username='" + username + ''' +
                ", password='" + password + ''' +
                '}';
    }
}

• 创建自动配置类

@SpringBootConfiguration  //当前类是个配置类
@EnableConfigurationProperties(DataSourceProperties.class)
public class DataSourceAutoConfiguration {
    @Autowired
    private DataSourceProperties dataSourceProperties;

   @Bean
    public DataSource createDataSource(){
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(dataSourceProperties.getDriverClassName());
        dataSource.setUrl(dataSourceProperties.getUrl());
        dataSource.setUsername(dataSourceProperties.getUsername());
        dataSource.setPassword(dataSourceProperties.getPassword());
        return dataSource;
    }

}

• 编写自动配置属性文件
• 在 resource 文件夹下面新建 META-INF/spring.factories

org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.study.config.DataSourceAutoConfiguration

• 执行install , 安装项目

🍁自定义启动器

• 重新创建个项目，引用SpringBoot_datasource的依赖

!--依赖自定义启动器-->
		dependency>
			groupId>com.study/groupId>
			artifactId>SpringBoot_datasource/artifactId>
			version>1.0-SNAPSHOT/version>
		/dependency>

• 配置连接池信息

server.port=8081
spring.jdbc.datasource.driverClassName=com.mysql.jdbc.Driver
spring.jdbc.datasource.url=jdbc:mysql:///springboot_datasource
spring.jdbc.datasource.username=root
spring.jdbc.datasource.password=root
spring.profiles.active=datasource

• 编写Controller类

@RestController
public class HelloAutoController {
    @Autowired
    private DataSource dataSource;

    @RequestMapping("/dataSource")
    public String dataSource() {
        System.out.println(dataSource.getClass());//打印DruidDataSource数据源
        return "Hello dataSource! ! ! " ;
    }

}

• 使用自定义启动类进行测试

🍁启动器支持多Druid和C3P0

• 添加创建druid和c3p0方法

@SpringBootConfiguration  //当前类是个配置类
@EnableConfigurationProperties(DataSourceProperties.class)
public class DataSourceAutoConfiguration {
    @Autowired
    private DataSourceProperties dataSourceProperties;
    @Bean
    @ConditionalOnProperty(value = "spring.jdbc.datasource.type",havingValue = "druid")
    public DataSource createDataSource(){
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(dataSourceProperties.getDriverClassName());
        dataSource.setUrl(dataSourceProperties.getUrl());
        dataSource.setUsername(dataSourceProperties.getUsername());
        dataSource.setPassword(dataSourceProperties.getPassword());
        return dataSource;
    }

    @Bean
    @ConditionalOnProperty(value = "spring.jdbc.datasource.type",havingValue = "c3p0")
    public DataSource createC3P0DataSource() throws Exception {
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass(dataSourceProperties.getDriverClassName());
        dataSource.setJdbcUrl(dataSourceProperties.getUrl());
        dataSource.setUser(dataSourceProperties.getUsername());
        dataSource.setPassword(dataSourceProperties.getPassword());
        return dataSource;
    }

}

• 配置文件中配置了spring.jdbc.datasource.type=druid使用druid数据源

server.port=8081
spring.jdbc.datasource.driverClassName=com.mysql.jdbc.Driver
spring.jdbc.datasource.url=jdbc:mysql:///springboot_datasource
spring.jdbc.datasource.username=root
spring.jdbc.datasource.password=root
spring.jdbc.datasource.type=druid

• 重新安装，再次测试

• 配置了spring.jdbc.datasource.type=c3p0使用c3p0数据源

server.port=8081
spring.jdbc.datasource.driverClassName=com.mysql.jdbc.Driver
spring.jdbc.datasource.url=jdbc:mysql:///springboot_datasource
spring.jdbc.datasource.username=root
spring.jdbc.datasource.password=root
spring.jdbc.datasource.type=c3p0

• 重新安装，再次测试