SpringBoot 自定义配置

#指定数据源类型为Druid
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

##########druid连接池配置#########
spring.datasource.druid.url=jdbc:mysql://127.0.0.1/db_xm_mall?serverTimezone=UTC
spring.datasource.druid.driverClassName=com.mysql.cj.jdbc.Driver
spring.datasource.druid.username=chy
spring.datasource.druid.password=abcd
##初始连接数，默认0
spring.datasource.druid.initialSize=10
#最大连接数，默认8
spring.datasource.druid.maxActive=30
spring.datasource.druid.minIdle=10
#获取连接的最大等待时间，单位毫秒
spring.datasource.druid.maxWait=2000
#缓存PreparedStatement，默认false
#spring.datasource.druid.poolPreparedStatements=true
#缓存PreparedStatement的最大数量，默认-1（不缓存）。大于0时会自动开启缓存PreparedStatement，所以可以省略上一句设置
spring.datasource.druid.maxOpenPreparedStatements=20

/**
 * 初始化Druid连接池
 */
@ConfigurationProperties("spring.datasource.druid")  //指定前缀
@Component  //也可以使用@Configuration，@Configuration包含了@Component
@Setter  //Lombok的注解。流程是调用空参构造器创建对象，再调用setter方法注入属性值，也可以使用@Data
public class DruidConfig {
    //属性名要与springboot配置文件中属性名一致
    private String url;
    private String driverClassName;
    private String username;
    private String password;
    private int initialSize;
    private int maxActive;
    private int minIdle;
    private int maxWait;
    // private boolean poolPreparedStatements;
    private int maxOpenPreparedStatements;

    @Bean  //放到Spring容器中
    // @Primary  //声明为主数据源，如果配置了多个数据源，未显式指定使用哪个数据源时，自动使用主数据源
    public DataSource dataSource() {
        DruidDataSource datasource = new DruidDataSource();

        datasource.setUrl(url);
        datasource.setDriverClassName(driverClassName);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setInitialSize(initialSize);
        datasource.setMaxActive(maxActive);
        datasource.setMinIdle(minIdle);
        datasource.setMaxWait(maxWait);
        // datasource.setPoolPreparedStatements(poolPreparedStatements);
        datasource.setMaxOpenPreparedStatements(maxOpenPreparedStatements);

        return datasource;
    }

}

        <!-- 自定义配置的提示 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>