Question

现在我已经知道了春天的mvc。完全是关于

context:component-scan

和

mvc:annotation-driven

和

tx:annotation-driven

在spring config xml

中

这是我的问题。据我所知，“context：component-scan”扫描所有bean。正如我所听到的，mvc：annotation-driven，tx：annotation-driven“s也扫描所有bean。

我认为这不高效且不合理。

为什么要扫描两次，三次。

有没有办法避免这种duicate解析？

任何答案都将不胜感激。谢谢。

Answer 1

在我看来，扫描过程不是你想象的两倍，三倍我认为他们是为相关的豆子申报的请参考以下总结并了解差异。

<context:annotation-config> 
Declares support for general annotations such as @Required, @Autowired, @PostConstruct, and so on.

<context:component-scan> 
can also do what <context:annotation-config> does but <context:component-scan> also scans packages to find and register beans within the application context.

<mvc:annotation-driven />  
Enables the Spring MVC @Controller programming model and 
declares explicit support for annotation-driven MVC controllers (i.e. @RequestMapping, @Controller, although support for those is the default behaviour), as well as adding support for declrative validation via @Valid and message body marshalling with @RequestBody/ResponseBody.

<tx:annotation-driven />
You do provide the transaction-manager instace directly within element. annotation-config and component-scan won't.

解析spring上下文时重复

1 个答案: