专业做网站建设广告竞价推广

🍁博客主页：👉不会压弯的小飞侠
✨欢迎关注：👉点赞👍收藏⭐留言✒
✨系列专栏：👉SpringBoot专栏
🔥欢迎大佬指正，一起学习！一起加油！

---

🍁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;}@Overridepublic 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 {@Autowiredprivate DataSourceProperties dataSourceProperties;@Beanpublic 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 {@Autowiredprivate 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 {@Autowiredprivate 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