Spring MVC 的 Controller 类是单例还是多例?
时间: 2024-03-11 17:45:25 浏览: 76
在 Spring MVC 中,Controller 类默认是单例的,即每个 Controller 类在整个应用程序中只会有一个实例。这是因为 Spring MVC 的 DispatcherServlet 会将请求分发给 Controller 实例进行处理,如果每次请求都创建一个新的 Controller 实例,会导致系统资源的浪费和性能下降。但是,如果需要将 Controller 设计为多例,可以通过在 Controller 类上添加 `@Scope("prototype")` 注解来实现。
相关问题
controller为啥是单例的
controller默认是单例的,这是因为Spring MVC框架是多线程单实例的MVC框架。对于同一个Controller,只会生成一个实例来处理所有的请求,这样可以更高效地利用内存和资源。所以,bean实例只会实例化一次,并被存放在工厂中,以供其他请求使用。这样可以提高性能并减少资源消耗。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
spring mvc源码
Spring MVC的源码包括多个组件和类。其中,Tomcat在启动时会通知Spring初始化容器,加载bean的定义信息并初始化所有单例bean。然后,Spring MVC会遍历容器中的bean,获取每个controller中方法访问的URL,并将URL和Controller保存到一个Map中。这一过程是由HandlerMapping组件完成的,它是Spring MVC中负责URL到Controller映射的组件。此外,在Spring MVC的源码中还有一个抽象类FrameworkServlet,它重写了初始化方法initServletBean(),可以在控制台或日志中打印初始化Servlet的名称以及初始化所需的时间。
以上是关于Spring MVC源码的一些重要信息,这些组件和类协同工作,实现了Spring MVC框架的核心功能。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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