标签:cat service java代码 get lap ref ret struct err
@Configuration 相当于beans、@bean相当于bean。
下面是一个典型的Spring配置文件(application-config.xml):
<beans>
<bean id="orderService" class="com.acme.OrderService"/>
<constructor-arg ref="orderRepository"/>
</bean>
<bean id="orderRepository" class="com.acme.OrderRepository"/>
<constructor-arg ref="dataSource"/>
</bean>
</beans>
然后你就可以像这样来使用是bean了:
ApplicationContext ctx = new ClassPathXmlApplicationContext("application-config.xml");
OrderService orderService = (OrderService) ctx.getBean("orderService");
现在Spring Java Configuration这个项目提供了一种通过java代码来装配bean的方案:
@Configuration
public class ApplicationConfig {
public @Bean OrderService orderService() {
return new OrderService(orderRepository());
}
public @Bean OrderRepository orderRepository() {
return new OrderRepository(dataSource());
}
public @Bean DataSource dataSource() {
// instantiate and return an new DataSource …
}
}
然后你就可以像这样来使用是bean了:
JavaConfigApplicationContext ctx = new JavaConfigApplicationContext(ApplicationConfig.class);
OrderService orderService = ctx.getBean(OrderService.class);
使用@Configuration注解来代替Spring的bean配置
标签:cat service java代码 get lap ref ret struct err
原文地址:http://www.cnblogs.com/chiang-xh/p/6667106.html