Spring Java Configuration——用java代码来装配Spring

一起学习

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");

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 …
}
}

@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);

JavaConfigApplicationContext ctx = new JavaConfigApplicationContext(ApplicationConfig.class);

OrderService orderService = ctx.getBean(OrderService.class);

这么做有什么好处呢?

• 使用纯java代码，不在需要xml
• 在配置中也可享受OO带来的好处
• 类型安全对重构也能提供良好的支持
• 依旧能享受到所有springIoC容器提供的功能

~r/Interface21TeamBlog/~3/258716055/

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