Web 感知上下文中的其他範圍

有幾個範圍僅在 Web 感知應用程式上下文中可用：

• request - 根據 HTTP 請求建立新的 bean 例項
• session - 每個 HTTP 會話建立一個新的 bean 例項
• application - 根據 ServletContext 建立新的 bean 例項
• globalSession - 在 Portlet 環境中為每個全域性會話建立新的 bean 例項（在 Servlet 環境中，全域性會話範圍等於會話範圍）
• websocket - 每個 WebSocket 會話建立新的 bean 例項

在 Spring Web MVC 環境中宣告和訪問 Web 範圍的 bean 不需要額外的設定。

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 之後）

@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();
    }
}

註釋驅動的元件

@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 {
    ...
}