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【Spring】@Beanアノテーションとは

@Configuration
@PropertySource({ "classpath:/jdbc.properties" })
public class DBConfig {

    @Autowired
    private Environment environment;

    @Bean
    public DataSource getDataSource() {
        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(environment.getProperty("jdbc.driverClassName"));
        dataSource.setUrl(environment.getProperty("jdbc.url"));
        dataSource.setUsername(environment.getProperty("jdbc.username"));
        dataSource.setPassword(environment.getProperty("jdbc.password"));
        return dataSource;
    }
}