1. singleton 2. prototype The client code must clean up prototype-scoped objects and release expensive resources that the prototype bean(s) are holding 需要釋放資源 bean post-processor,? 如果單例bean需要獲取prototype, 不要使用注入方式。用方法獲取。 3.request 4.session 5.application 6.websocket ?使用Spring Web MVC， DispatcherServlet? 針對以上四種不需要特別處理。 如果使用Servlet 2.5 web container,?,不用DispatcherServlet?的話，需要注冊org.springframework.web.context.request.RequestContextListener <web-app> ... <listener> <listener-class> org.springframework.web.context.request.RequestContextListener </listener-class> </listener> ... </web-app> 或者有問題， 可以使用如下方式： <web-app> ... <filter> <filter-name>requestContextFilter</filter-name> <filter-class>org.springframework.web.filter.RequestContextFilter</filter-class> </filter> <filter-mapping> <filter-name>requestContextFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> ... </web-app> <bean id="loginAction" class="com.foo.LoginAction" scope="request"/> @RequestScope @Component public class LoginAction { // ... } } @SessionScope @Component public class UserPreferences { // ... } } @ApplicationScope @Component public class AppPreferences { // ... } } <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- an HTTP Session-scoped bean exposed as a proxy --> <bean id="userPreferences" class="com.foo.UserPreferences" scope="session"> <!-- instructs the container to proxy the surrounding bean --> <aop:scoped-proxy/> </bean> <!-- a singleton-scoped bean injected with a proxy to the above bean --> <bean id="userService" class="com.foo.SimpleUserService"> <!-- a reference to the proxied userPreferences bean --> <property name="userPreferences" ref="userPreferences"/> </bean> </beans> ----- <bean id="userPreferences" class="com.foo.UserPreferences" scope="session"/> <bean id="userManager" class="com.foo.UserManager"> <property name="userPreferences" ref="userPreferences"/> </bean> 這里需要在userPreferences下面加上<aop:scoped-proxy/>， 如果不加的話，userManager是singleton的， 這樣的話userPreferences也是singleton的， 是最初初始化的那個。 當將壽命較短的scoped bean注入一個壽命較長的scoped bean時的處理， 代理 以下的用法是對的： <bean id="userPreferences" class="com.foo.UserPreferences" scope="session"> <aop:scoped-proxy/> </bean> <bean id="userManager" class="com.foo.UserManager"> <property name="userPreferences" ref="userPreferences"/> </bean> 默認使用CGLIB-based的代理， 如果要使用JDK本身的代理， 需要設置proxy-target-class="false"， 類似 <!-- DefaultUserPreferences implements the UserPreferences interface --> <bean id="userPreferences" class="com.foo.DefaultUserPreferences" scope="session"> <aop:scoped-proxy proxy-target-class="false"/> </bean> <bean id="userManager" class="com.foo.UserManager"> <property name="userPreferences" ref="userPreferences"/> </bean> 1.5.5 Custom scopes-客制化的范圍 實現 org.springframework.beans.factory.config.Scope接口。 void registerScope(String scopeName, Scope scope); 例子： Scope threadScope = new SimpleThreadScope(); b beanFactory.registerScope("thread", threadScope); <bean id="..." class="..." scope="thread"> 也可以使用定義的方式： <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <bean class="org.springframework.beans.factory.config.CustomScopeConfigurer"> <property name="scopes"> <map> <entry key="thread"> <bean class="org.springframework.context.support.SimpleThreadScope"/> </entry> </map> </property> </bean> <bean id="bar" class="x.y.Bar" scope="thread"> <property name="name" value="Rick"/> <aop:scoped-proxy/> </bean> <bean id="foo" class="x.y.Foo"> <property name="bar" ref="bar"/> </bean> </beans> When you place?<aop:scoped-proxy/>?in a?FactoryBean?implementation, it is the factory bean itself that is scoped, not the object returned from?getObject(). 使用<aop:scoped-proxy/>的話， 使用?getObject是得不到對象的。