-3

最近需要在Struts2中使用DI。我知道它使用自己的 DI 实现，如 Guice 但不是 Guice，因为我找不到一些适合设置注入 bean 范围的注释。简而言之，我创建了一个 bean

//@Repository
//@Scope("session")
public class Session {

    private Map<String, Object> map = new HashMap<>();

    public Map<String, Object> getMap() {
        return map;
    }

    public void setMap(Map<String, Object> map) {
        this.map = map;
    }
}

我已经评论了 Spring bean 使用的注释。我通过 spring DI 成功创建了同一个 bean，并设置了我的对象被注入的范围。现在，我想对 Struts2 和 DI 做同样的事情。为此，我在struts.xml

<bean name="session" class="jspbean.struts.Session" scope="session"/>

以及创建该 bean 并将其注入我的操作的简单操作

public class DefaultAction extends ActionSupport {

    private Session session;

    //  @Autowired
    @Inject("session")
    public void setSession(Session session) {
        this.session = session;
    }

    public Session getSession() {
        return session;
    }

    private Map<String, String> myMap = new HashMap<String, String>();

    public Map<String, String> getMyMap() {
        return myMap;
    }

    public void setMyMap(Map<String, String> myMap) {
        this.myMap = myMap;
    }

    @Override
    public String execute() throws Exception {
        //populate my bean with sample data
        myMap.put("q1", "Question1");
        myMap.put("q2", "Question2");
        session.getMap().put("myMap", myMap);
        return SUCCESS;
    }
}

在 JSP 中，我在会话 bean 上使用简单的迭代器

<s:iterator value="session.map['myMap']">
  <s:textfield name="myMap['%{key}']" value="%{value}" theme="simple" size="10" /><br>
</s:iterator>

现在，当我运行这个简单的应用程序时，我遇到了异常

Stacktraces
Unable to instantiate Action, jspbean.struts.DefaultAction, defined for '' in namespace '/'java.lang.IllegalStateException: Scope strategy not set. Please call Container.setScopeStrategy().

    com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:316)
    com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:397)
    com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:194)
    org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
    org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
    com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:536)
    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    java.lang.Thread.run(Unknown Source)


java.lang.RuntimeException: java.lang.IllegalStateException: Scope strategy not set. Please call Container.setScopeStrategy().

    com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:301)
    com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:492)
    com.opensymphony.xwork2.inject.ContainerImpl$6.call(ContainerImpl.java:530)
    com.opensymphony.xwork2.inject.ContainerImpl$6.call(ContainerImpl.java:528)
    com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:584)
    com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:528)
    com.opensymphony.xwork2.ObjectFactory.injectInternalBeans(ObjectFactory.java:139)
    com.opensymphony.xwork2.spring.SpringObjectFactory.autoWireBean(SpringObjectFactory.java:208)
    com.opensymphony.xwork2.spring.SpringObjectFactory.buildBean(SpringObjectFactory.java:183)
    com.opensymphony.xwork2.spring.SpringObjectFactory.buildBean(SpringObjectFactory.java:154)
    com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:151)
    com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:121)
    com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:297)
    com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:397)
    com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:194)
    org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
    org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
    com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:536)
    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    java.lang.Thread.run(Unknown Source)


java.lang.IllegalStateException: Scope strategy not set. Please call Container.setScopeStrategy().

    com.opensymphony.xwork2.inject.InternalContext.getScopeStrategy(InternalContext.java:53)
    com.opensymphony.xwork2.inject.Scope$5$1.create(Scope.java:130)
    com.opensymphony.xwork2.inject.ContainerImpl$ParameterInjector.inject(ContainerImpl.java:469)
    com.opensymphony.xwork2.inject.ContainerImpl.getParameters(ContainerImpl.java:484)
    com.opensymphony.xwork2.inject.ContainerImpl.access$000(ContainerImpl.java:34)
    com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:299)
    com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:492)
    com.opensymphony.xwork2.inject.ContainerImpl$6.call(ContainerImpl.java:530)
    com.opensymphony.xwork2.inject.ContainerImpl$6.call(ContainerImpl.java:528)
    com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:584)
    com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:528)
    com.opensymphony.xwork2.ObjectFactory.injectInternalBeans(ObjectFactory.java:139)
    com.opensymphony.xwork2.spring.SpringObjectFactory.autoWireBean(SpringObjectFactory.java:208)
    com.opensymphony.xwork2.spring.SpringObjectFactory.buildBean(SpringObjectFactory.java:183)
    com.opensymphony.xwork2.spring.SpringObjectFactory.buildBean(SpringObjectFactory.java:154)
    com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:151)
    com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:121)
    com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:297)
    com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:397)
    com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:194)
    org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
    org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
    com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:536)
    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    java.lang.Thread.run(Unknown Source)

异常说我需要设置范围策略。所以，我的问题是这个范围策略是什么以及如何在我的简单应用程序中实现它。另外，还有注释@Scoped，这些注释如何应用于我的情况？

我的示例参考：

  1. 豆配置
4

2 回答 2

4

让我们从查看Scope.Strategy文档开始了解什么是 a。它说

可插拔范围策略。使用户能够提供请求、会话和向导范围的自定义实现。实施并传递给 Container.setScopeStrategy(com.opensymphony.xwork2.inject.Scope.Strategy)

好的，假设我想实现会话范围。然后我需要知道我可以实现它的地方。该框架有它的扩展点，您可以在其中插入扩展或简单地扩展default实现并提供您自己的自定义实现。这很容易通过查看BeanSelectionProvider. 然后分析堆栈跟踪，我认为最好的办法是扩展DefaultActionProxyFactory. 扩展它也需要扩展DefaultActionProxy。

public class MyActionProxyFactory extends DefaultActionProxyFactory {

    public MyActionProxyFactory() {
        super();
    }

    @Override
    public ActionProxy createActionProxy(ActionInvocation inv, String namespace, String actionName, String methodName, boolean executeResult, boolean cleanupContext) {

        MyActionProxy proxy = new MyActionProxy(inv, namespace, actionName, methodName, executeResult, cleanupContext);
        container.inject(proxy);
        container.setScopeStrategy(new MyScopeStrategy());
        proxy.prepare();
        return proxy;
    }
}

public class MyActionProxy extends DefaultActionProxy {

    protected MyActionProxy(ActionInvocation inv, String namespace, String actionName, String methodName, boolean executeResult, boolean cleanupContext) {
        super(inv, namespace, actionName, methodName, executeResult, cleanupContext);
    }

    @Override
    protected void prepare() {
        super.prepare();
    }
}

public class MyScopeStrategy implements Scope.Strategy {

    @Override
    public <T> T findInRequest(Class<T> type, String name, Callable<? extends T> factory) throws Exception {
        return null;
    }

    @Override
    public <T> T findInSession(Class<T> type, String name, Callable<? extends T> factory) throws Exception {

        ActionContext context = ActionContext.getContext();
        SessionMap<String, T> sessionMap = (SessionMap<String, T>) context.getSession();

        if (sessionMap == null) {
            sessionMap = new SessionMap<String, T>(ServletActionContext.getRequest());
            context.setSession((Map<String, Object>) sessionMap);
        }

        T obj = sessionMap.get(name);

        if (obj == null) {
            obj = factory.call();
            sessionMap.put(name, obj);
        }
        return obj;
    }

    @Override
    public <T> T findInWizard(Class<T> type, String name, Callable<? extends T> factory) throws Exception {
        return null;
    }
}

在配置文件中struts.xml，您应该设置属性

<constant name="struts.actionProxyFactory" value="jspbean.struts.factory.MyActionProxyFactory"/>

Session这就是在会话范围内注入 bean 所需的全部内容。可以对其他范围进行类似的实现。请注意，像 singlton（默认使用）、线程和默认等其他范围似乎不需要这种可插入的扩展。最后一个词是关于@Scoped注释的。如果您通过 xml 配置提供 bean，则不会使用它。但是，如果您ContainerBuilder以任何其他方式提供 bean，它就能够在其上找到注释并设置相应的范围。

于 2013-06-30T21:16:12.317 回答
2

我相信 Luiggi 的评论是正确的。“@Inject”需要在字段值本身上，而不是在 setter 上。

 @Inject("session")
 private Session session;

只要您在 struts.xml 中定义了“会话”bean，或者在 Struts 容器中注册了它，它就应该能够找到并注入它。从你的解释看来是这样。

有关更具体的信息，请查看有关 Struts 用户列表的讨论：Struts user question on built-in DI

于 2013-06-26T16:48:36.633 回答