通过实例了解Spring中@Profile的作用

@Configuration
@PropertySource("classpath:/jdbc.properties")
public class MainProfileConfig implements EmbeddedValueResolverAware {

  @Value("${db.user}")
  private String user;

  private String driverClass;

  private StringValueResolver stringValueResolver;

  @Profile("test")
  @Bean("testDataSource")
  public DataSource getTestDataSource(@Value("${db.password}") String pwd) throws PropertyVetoException {
    ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();
    comboPooledDataSource.setUser(user);
    comboPooledDataSource.setPassword(pwd);
    comboPooledDataSource.setDriverClass(driverClass);
    return comboPooledDataSource;
  }

  @Profile("dev")
  @Bean("devDataSource")
  public DataSource getDevDataSource(@Value("${db.password}") String pwd) throws PropertyVetoException {
    ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();
    comboPooledDataSource.setUser(user);
    comboPooledDataSource.setPassword(pwd);
    comboPooledDataSource.setDriverClass(driverClass);
    return comboPooledDataSource;
  }

  @Profile("pro")
  @Bean("proDataSource")
  public DataSource getproDataSource(@Value("${db.password}") String pwd) throws PropertyVetoException {
    ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();
    comboPooledDataSource.setUser(user);
    comboPooledDataSource.setPassword(pwd);
    comboPooledDataSource.setDriverClass(driverClass);
    return comboPooledDataSource;
  }

  @Override
  public void setEmbeddedValueResolver(StringValueResolver stringValueResolver) {
    this.stringValueResolver = stringValueResolver;
    driverClass = stringValueResolver.resolveStringValue("${db.driverClass}");
  }
}

public class ProFileTest {

  @Test
  public void test(){
    AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainProfileConfig.class);

    String[] beanNamesForType = applicationContext.getBeanNamesForType(DataSource.class);
    for (String name : beanNamesForType){
      System.out.println(name);
    }
    applicationContext.close();
  }
}

@Test
  public void test(){
    //创建容器
    AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext();
    //设置需要激活的环境
    applicationContext.getEnvironment().setActiveProfiles("test");
    //设置主配置类
    applicationContext.register(MainProfileConfig.class);
    //启动刷新容器
    applicationContext.refresh();

    String[] beanNamesForType = applicationContext.getBeanNamesForType(DataSource.class);
    for (String name : beanNamesForType){
      System.out.println(name);
    }
    applicationContext.close();
  }

public interface ConfigurableEnvironment extends Environment, ConfigurablePropertyResolver {
  void setActiveProfiles(String... var1);