JSF在Spring中查看范围

Question

@ViewScoped在Spring 3.0中是否有像JSF这样的范围？我有一个使用JSF + Spring的应用程序,其中支持bean由Spring管理.我在Spring中没有找到像JSF wiew作用域这样的范围.我看到博客将JSF 2.0的ViewScope移植到Spring 3.0,但它对我不起作用.

这是我对自定义Spring范围的尝试:

import java.util.Map;

import javax.faces.context.FacesContext;

import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.config.Scope;

/**
 * Implements the JSF View Scope for use by Spring. This class is registered as a Spring bean with the CustomScopeConfigurer.
*/
public class ViewScope implements Scope {

    public Object get(String name, ObjectFactory<?> objectFactory) {

        System.out.println("**************************************************");
        System.out.println("-------------------- Getting objects For View Scope ----------");
        System.out.println("**************************************************");
        if (FacesContext.getCurrentInstance().getViewRoot() != null) {
            Map<String, Object> viewMap = FacesContext.getCurrentInstance().getViewRoot().getViewMap();
            if (viewMap.containsKey(name)) {
                return viewMap.get(name);
            } else {
                Object object = objectFactory.getObject();
                viewMap.put(name, object);
                return object;
            }
        } else {
            return null;
        }
    }

    public Object remove(String name) {
        System.out.println("**************************************************");
        System.out.println("-------------------- View Scope object Removed ----------");
        System.out.println("**************************************************");

        if (FacesContext.getCurrentInstance().getViewRoot() != null) {
            return FacesContext.getCurrentInstance().getViewRoot().getViewMap().remove(name);
        } else {
            return null;
        }
    }

    public void registerDestructionCallback(String name, Runnable callback) {
        // Do nothing
    }

    public Object resolveContextualObject(String key) {         return null;
    }

    public String getConversationId() {
        return null;
    }

}

application-context.xml:

<bean class="org.springframework.beans.factory.config.CustomScopeConfigurer">
    <property name="scopes">
            <map>
                <entry key="view">
                    <bean class="com.delta.beans.ViewScope"/>
                </entry>
            </map>
        </property>
 </bean>

Answer 1

最近我创建了 Maven 工件来解决这个问题。

请参阅我的 github javaplugs/spring-jsf存储库。

Answer 2

public class ViewScope implements Scope {\n\npublic static final String VIEW_SCOPE_CALLBACKS = "viewScope.callbacks";\n\n@Override\npublic synchronized Object get(String name, ObjectFactory<?> objectFactory) {\nObject instance = this.getViewMap().get(name);\nif(instance == null){\ninstance = objectFactory.getObject();\nthis.getViewMap().put(name, instance);\n}\nreturn instance;\n}\n\n@SuppressWarnings("unchecked")\n@Override\npublic Object remove(String name) {\nObject instance = this.getViewMap().remove(name);\nif(instance == null){\nMap<String, Runnable> callbacks = (Map<String, Runnable>) this.getViewMap().get(VIEW_SCOPE_CALLBACKS);\nif(callbacks != null)\ncallbacks.remove(name);\n}\nreturn instance;\n}\n\n/**\n* Respons\xc3\xa1vel por registrar uma chamada de destrui\xc3\xa7\xc3\xa3o ao bean\n* que ser\xc3\xa1 armazenadano [b]viewMap[/b] da [b]ViewRoot[/b](nossa p\xc3\xa1gina que ser\xc3\xa1 mostrada)\n* @see #getViewMap()\n* @param name - nome do bean\n* @param runnable\n*/  \n@SuppressWarnings("unchecked")\n@Override\npublic void registerDestructionCallback(String name, Runnable runnable) {\nMap<String, Runnable> callbacks = (Map<String, Runnable>) this.getViewMap().get(VIEW_SCOPE_CALLBACKS);\nif(callbacks != null)\ncallbacks.put(name, runnable);\n}\n\n@Override\npublic Object resolveContextualObject(String key) {\nFacesContext facesContext = FacesContext.getCurrentInstance();\nFacesRequestAttributes facesResquestAttributes = new FacesRequestAttributes(facesContext);\nreturn facesResquestAttributes.resolveReference(key);\n}\n\n@Override\npublic String getConversationId() {\nFacesContext facesContext = FacesContext.getCurrentInstance();\nFacesRequestAttributes facesResquestAttributes = new FacesRequestAttributes(facesContext);  \nreturn facesResquestAttributes.getSessionId() + "-" + facesContext.getViewRoot().getViewId();\n}\n\nprivate Map<String, Object> getViewMap(){\nreturn FacesContext.getCurrentInstance().getViewRoot().getViewMap();\n}\n\n}\n

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