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1.装配进阶
1)environment-specific bean
@profile
@Configuration public class DataSourceConfig { @Bean(destroyMethod="shutdown") @Profile("dev") public DataSource embeddedDataSource() { return new EmbeddedDatabaseBuilder() .setType(EmbeddedDatabaseType.H2) .addScript("classpath:schema.sql") .addScript("classpath:test-data.sql") .build(); } @Bean @Profile("prod") public DataSource jndiDataSource() { JndiObjectFactoryBean jndiObjectFactoryBean = new JndiObjectFactoryBean(); jndiObjectFactoryBean.setJndiName("jdbc/myDS"); jndiObjectFactoryBean.setResourceRef(true); jndiObjectFactoryBean.setProxyInterface(javax.sql.DataSource.class); return (DataSource) jndiObjectFactoryBean.getObject(); } }
2）conditioinal beans
@Conditional
@Bean @Conditional(MagicExistsCondition.class) public MagicBean magicBean() { return new MagicBean(); }
3）ambiguity in autowiring
autowiring works when exactly one bean matches the disired result.
@ Primary--- designating a primary bean
@Qualifier("beanid")
4)Scoping beans
在spring的应用上下文中，所有的bean都是单例的
@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
? Singleton—One instance of the bean is created for the entire application.
? Prototype—One instance of the bean is created every time the bean is injected
into or retrieved from the Spring application context.
? Session—In a web application, one instance of the bean is created for each session.
? Request—In a web application, one instance of the bean is created for each
request.
5）runtime value injection
@Configuration @PropertySource("classpath:/com/soundsystem/app.properties") public class ExpressiveConfig { @Autowired Environment env; @Bean public BlankDisc disc() { return new BlankDisc( env.getProperty("disc.title"), env.getProperty("disc.artist")); }
}
6) wiring with Spring Expression Language(SpEL)
#{}
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原文地址：http://www.cnblogs.com/flyingbee6/p/5351414.html
