Web 感知上下文中的其他范围

有几个范围仅在 Web 感知应用程序上下文中可用：

• request - 根据 HTTP 请求创建新的 bean 实例
• session - 每个 HTTP 会话创建一个新的 bean 实例
• application - 根据 ServletContext 创建新的 bean 实例
• globalSession - 在 Portlet 环境中为每个全局会话创建新的 bean 实例（在 Servlet 环境中，全局会话范围等于会话范围）
• websocket - 每个 WebSocket 会话创建新的 bean 实例

在 Spring Web MVC 环境中声明和访问 Web 范围的 bean 不需要额外的设置。

XML 配置

<bean id="myRequestBean" class="OneClass" scope="request"/>
<bean id="mySessionBean" class="AnotherClass" scope="session"/>
<bean id="myApplicationBean" class="YetAnotherClass" scope="application"/>
<bean id="myGlobalSessionBean" class="OneMoreClass" scope="globalSession"/>

Java 配置（在 Spring 4.3 之前）

@Configuration
public class MyConfiguration {

    @Bean
    @Scope(value = WebApplicationContext.SCOPE_REQUEST, proxyMode = ScopedProxyMode.TARGET_CLASS)
    public OneClass myRequestBean() {
        return new OneClass();
    }

    @Bean
    @Scope(value = WebApplicationContext.SCOPE_SESSION, proxyMode = ScopedProxyMode.TARGET_CLASS)
    public AnotherClass mySessionBean() {
        return new AnotherClass();
    }

    @Bean
    @Scope(value = WebApplicationContext.SCOPE_APPLICATION, proxyMode = ScopedProxyMode.TARGET_CLASS)
    public YetAnotherClass myApplicationBean() {
        return new YetAnotherClass();
    }

    @Bean
    @Scope(value = WebApplicationContext.SCOPE_GLOBAL_SESSION, proxyMode = ScopedProxyMode.TARGET_CLASS)
    public OneMoreClass myGlobalSessionBean() {
        return new OneMoreClass();
    }
}

Java 配置（春季 4.3 之后）

@Configuration
public class MyConfiguration {

    @Bean
    @RequestScope
    public OneClass myRequestBean() {
        return new OneClass();
    }

    @Bean
    @SessionScope
    public AnotherClass mySessionBean() {
        return new AnotherClass();
    }

    @Bean
    @ApplicationScope
    public YetAnotherClass myApplicationBean() {
        return new YetAnotherClass();
    }
}

注释驱动的组件

@Component
@RequestScope
public class OneClass {
    ...
}

@Component
@SessionScope
public class AnotherClass {
    ...
}

@Component
@ApplicationScope
public class YetAnotherClass {
    ...
}

@Component
@Scope(scopeName = WebApplicationContext.SCOPE_GLOBAL_SESSION, proxyMode = ScopedProxyMode.TARGET_CLASS)
public class OneMoreClass {
    ...
}

@Component
@Scope(scopeName = "websocket", proxyMode = ScopedProxyMode.TARGET_CLASS)
public class AndOneMoreClass {
    ...
}