@Configuration
public class AppConfig {//这个方法就向Spring容器注入了一个类型是MyBean名字是myBean的Bean@Beanpublic MyBean myBean() {// instantiate, configure and return bean ...}
}

AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
//这是configuration类
ctx.register(AppConfig.class);
ctx.refresh();
MyBean myBean = ctx.getBean(MyBean.class);
// use myBean ...

<beans><context:annotation-config/><!--也可以这样加载configuration类--><bean class="com.acme.AppConfig"/>
</beans>

@Configuration
public class AppConfig {private final SomeBean someBean;//构造函数注入public AppConfig(SomeBean someBean) {this.someBean = someBean;}//注入另一个bean@Autowiredprivate AnotherBean1 anotherBean1；//注入另一个bean@Resourceprivate AnotherBean2 anotherBean2;// @Bean definition using "SomeBean"
}

@Configuration
//做组件扫描
@ComponentScan("com.acme.app.services")
public class AppConfig {// various @Bean definitions ...
}

@Configuration
public class AppConfig {//注入Environment @Autowired Environment env;@Beanpublic MyBean myBean() {MyBean myBean = new MyBean();myBean.setName(env.getProperty("bean.name"));return myBean;}
}

@Configuration
//引入property文件
@PropertySource("classpath:/com/acme/app.properties")
public class AppConfig {@Inject Environment env;@Beanpublic MyBean myBean() {return new MyBean(env.getProperty("bean.name"));}
}

@Configuration
@PropertySource("classpath:/com/acme/app.properties")
public class AppConfig {@Value("${bean.name}") String beanName;@Beanpublic MyBean myBean() {return new MyBean(beanName);}
}

@org.springframework.context.annotation.Configuration
@ConditionalOnClass({ SqlSessionFactory.class, SqlSessionFactoryBean.class })
@ConditionalOnBean(DataSource.class)
@EnableConfigurationProperties(MybatisProperties.class)
@AutoConfigureAfter(DataSourceAutoConfiguration.class)
public class MybatisAutoConfiguration {...
}
@ConfigurationProperties(prefix = MybatisProperties.MYBATIS_PREFIX)
public class MybatisProperties {...
}

//这是一个@Configuration类
@Configuration
public class DatabaseConfig {@Beanpublic DataSource dataSource() {// instantiate, configure and return DataSource}
}
//这里可以引用上面的配置类
@Configuration
@Import(DatabaseConfig.class)
public class AppConfig {private final DatabaseConfig dataConfig;public AppConfig(DatabaseConfig dataConfig) {this.dataConfig = dataConfig;}@Beanpublic MyBean myBean() {// reference the dataSource() bean methodreturn new MyBean(dataConfig.dataSource());}
}

new AnnotationConfigApplicationContext(AppConfig.class);

@Profile("development")
@Configuration
public class EmbeddedDatabaseConfig {@Beanpublic DataSource dataSource() {// instantiate, configure and return embedded DataSource}
}
@Profile("production")
@Configuration
public class ProductionDatabaseConfig {@Beanpublic DataSource dataSource() {// instantiate, configure and return production DataSource}
}

@Configuration
public class ProfileDatabaseConfig {@Bean("dataSource")@Profile("development")public DataSource embeddedDatabase() { ... }@Bean("dataSource")@Profile("production")public DataSource productionDatabase() { ... }
}

@Configuration
@ImportResource("classpath:/com/acme/database-config.xml")
public class AppConfig {@Inject DataSource dataSource; // from XML@Beanpublic MyBean myBean() {// inject the XML-defined dataSource beanreturn new MyBean(this.dataSource);}
}

@Configuration
public class AppConfig {@Inject DataSource dataSource;@Beanpublic MyBean myBean() {return new MyBean(dataSource);}@Configurationstatic class DatabaseConfig {@BeanDataSource dataSource() {return new EmbeddedDatabaseBuilder().build();}}
}

// @Configuration类：
@RunWith(SpringRunner.class)
@ContextConfiguration(classes = {AppConfig.class, DatabaseConfig.class})
public class MyTests {@Autowired MyBean myBean;@Autowired DataSource dataSource;@Testpublic void test() {// assertions against myBean ...}
}