spring部分注解

@Controller
@SpringBootApplication
@Configuration
@ComponentScan(basePackages={"first","third"})   //配置扫描包
@PropertySource(value={"classpath:jdbc.properties"})  //指定读取配置文件
public class HelloApplication {
    @Value("${url}")
    private String url;
    @Bean
    public DataSource dataSource() {
        System.out.println(url);
        DruidDataSource ds = new DruidDataSource();
        ds.setUrl(url);
        return ds;
    }

    public static void main(String[] args) {
        SpringApplication.run(HelloApplication.class, args);
    }
}