Spring Bean Scopes [英] Spring Bean Scopes

问题描述

有人可以解释一下Spring bean中的范围是什么我总是只使用'原型'但是我可以用其他参数代替吗？

Can someone explain what the scopes are in Spring beans I've always just used 'prototype' but are there other parameters I can put in place of that?

我正在谈论的例子

    <bean id="customerInfoController" class="com.action.customer.Controller" scope="prototype">
    <property name="accountDao" ref="accountDao"/>
    <property name="utilityDao" ref="utilityDao"/>
    <property name="account_usageDao" ref="account_usageDao"/>  
</bean>

推荐答案

来自spring specs ，支持五种类型的bean范围：

From the spring specs, there are five types of bean scopes supported :

1。 singleton（默认*）

根据Spring
IoC容器将单个bean定义范围扩展到单个对象实例。

Scopes a single bean definition to a single object instance per Spring IoC container.

2。原型

将单个bean定义范围限定为任意数量的对象实例。

Scopes a single bean definition to any number of object instances.

3。请求

将单个bean定义范围限定为单个HTTP
请求的生命周期;也就是说，每个HTTP请求都有自己的
实例，该实例是在单个bean定义的后面创建的。
仅在支持Web的Spring ApplicationContext上下文中有效。

Scopes a single bean definition to the lifecycle of a single HTTP request; that is each and every HTTP request will have its own instance of a bean created off the back of a single bean definition. Only valid in the context of a web-aware Spring ApplicationContext.

4。会话

将单个bean定义范围限定为HTTP会话的生命周期。
仅在支持Web的Spring ApplicationContext上下文中有效。

Scopes a single bean definition to the lifecycle of a HTTP Session. Only valid in the context of a web-aware Spring ApplicationContext.

5。全局会话

将单个bean定义范围限定为全局HTTP
会话的生命周期。通常仅在portlet上下文中使用时有效。只有
在Web感知Spring ApplicationContext的上下文中有效。

Scopes a single bean definition to the lifecycle of a global HTTP Session. Typically only valid when used in a portlet context. Only valid in the context of a web-aware Spring ApplicationContext.

* default表示未明确提供范围时< bean /> 标记。
在这里阅读更多关于它们的信息： http：// static。 springsource.org/spring/docs/3.0.0.M3/reference/html/ch04s04.html

*default means when no scope is explicitly provided in the <bean /> tag. read more about them here: http://static.springsource.org/spring/docs/3.0.0.M3/reference/html/ch04s04.html

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