專案結構：

1、匯入依賴

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.1</version>
        <relativePath/>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.oracle.database.jdbc</groupId>
            <artifactId>ojdbc8</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1
 
.13</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

2、在application.properties編輯配置

server.port=8080

jdbc.driverClassName=oracle.jdbc.driver.OracleDriver
jdbc.url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
jdbc.username=c##boat
jdbc.password=c##boat
jdbc.initialSize=10
jdbc.minIdle=5
jdbc.maxActive=20

3、建立配置類

@Component
@ConfigurationProperties(prefix = "jdbc
 
")
public class JdbcProperties {
    private String driverClassName;
    private String url;
    private String username;
    private String password;
    private Integer initialSize;
    private Integer minIdle;
    private Integer maxActive;

　　/*忽略getter setter*/

}

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@EnableConfigurationProperties({JdbcProperties.class})
public class JdbcConfig {

    @Autowired
    private JdbcProperties jdbcProperties;

    @Bean
    public DruidDataSource druidDataSource(){
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setDriverClassName(jdbcProperties.getDriverClassName());
        druidDataSource.setUrl(jdbcProperties.getUrl());
        druidDataSource.setUsername(jdbcProperties.getUsername());
        druidDataSource.setPassword(jdbcProperties.getPassword());
        druidDataSource.setInitialSize(jdbcProperties.getInitialSize());
        druidDataSource.setMinIdle(jdbcProperties.getMinIdle());
        druidDataSource.setMaxActive(jdbcProperties.getMaxActive());
        return  druidDataSource;
    }

}

4、測試DruidDataSource

@SpringBootTest
class Demo01ApplicationTests {

    @Autowired
    private DruidDataSource druidDataSource;

    @Test
    void contextLoads() {
        System.out.println(druidDataSource);
    }
}