ctinoProxy的全名是com.opensymphony.xwork2.ActionProxy，
ActionProxy = Action + Proxy，從字面意思來解釋：Action的代理。
在Struts中，ActionContext、ActionInvocation、ActionProxy、ActionConfig聯系的很緊密。
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ActionContext<-->ActionInvocation<-->ActionProxy-->ActionConfig
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（1.1）從ActionContext對象可以得到ActionInvocation對象
（1.2）從ActionInvocation對象可以得到ActionContext對象
（2.1）從ActionInvocation對象可以得到ActionProxy對象
（2.2）從ActionProxy對象可以得到ActionInvocation對象
（3.1）從ActionProxy對象可以得到ActionConfig對象
在搜索的時候 ，遇到一句描述ActionInvocation和ActionProxy關系的話，感覺非常切中要害：
Essentially, ActionProxy encapsulates how an Action can be obtained. ActionInvocation encapsulates how the Action is executed when a request is invoked.
本質上來，ActionProxy對如何獲取Action對象進行了封裝，而ActionInvocation對如何執行Action進行了封裝。
原話地址：https://struts.apache.org/docs/action-proxy-actionproxy-factory.html
Typically, an ActionProxy will utilize the ActionInvocation to encapsulate the execution of a particular request.
The ActionInvocation determines how an Action is handled: Is it being intercepted? Is there a PreResultListener acting on it?
在上面圖中，
ActionConfig，負責從struts.xml文件中讀取配置；
ActionSupport，我們自己實現的Action類一般都繼承ActionSupport類；
ActionContext，是Action運行的環境，為Action類提供一些信息；
ActionProxy，是如何獲取Action；
ActionInvocation是如何執行Action。
上面標的（1）至（4），都能通過ActionProxy來獲得：
（1）表示當前Action類在struts.xml文件中對應的<action>標簽所在的<package>標簽的namespace屬性
（2）表示<action>標簽的name屬性
（3）表示真實的Action類的實例，不是字符串類型，而<action>標簽的class屬性對應的類的實例化。
（4）<action>標簽的method屬性
從一些java培訓機構的視頻來看，ActionProxy實現了URL和真正Action類之間的映射。
1、如何獲取ActionProxy對象
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ActionProxy proxy = invocation.getProxy();
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2、如何獲取ActionProxy中的值
（1）獲取當前<action>所在的命名空間
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String namespace = proxy.getNamespace();
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（2）獲取<action>的名字
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String actionName = proxy.getActionName();
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（3）獲取Action類的實例
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Object action = proxy.getAction();
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（4）獲取<action>執行的方法
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String method = proxy.getMethod();
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（5）得到ActionInvocation和ActionConfig對象
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ActionConfig config = proxy.getConfig();
ActionInvocation invocation2 = proxy.getInvocation();
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3、ActionProxy的源代碼
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package
com.opensymphony.xwork2;
import
com.opensymphony.xwork2.config.entities.ActionConfig;
/**
* ActionProxy is an extra layer between XWork and the action so that different proxies are possible.
* <p/>
* An example of this would be a remote proxy, where the layer between XWork and the action might be RMI or SOAP.
*
* @author Jason Carreira
*/
public
interface
ActionProxy {
/**
* Gets the Action instance for this Proxy.
*
* @return the Action instance
*/
Object getAction();
/**
* Gets the alias name this ActionProxy is mapped to.
*
* @return the alias name
*/
String getActionName();
/**
* Gets the ActionConfig this ActionProxy is built from.
*
* @return the ActionConfig
*/
ActionConfig getConfig();
/**
* Sets whether this ActionProxy should also execute the Result after executing the Action.
*
* @param executeResult <tt>true</tt> to also execute the Result.
*/
void
setExecuteResult(
boolean
executeResult);
/**
* Gets the status of whether the ActionProxy is set to execute the Result after the Action is executed.
*
* @return the status
*/
boolean
getExecuteResult();
/**
* Gets the ActionInvocation associated with this ActionProxy.
*
* @return the ActionInvocation
*/
ActionInvocation getInvocation();
/**
* Gets the namespace the ActionConfig for this ActionProxy is mapped to.
*
* @return the namespace
*/
String getNamespace();
/**
* Execute this ActionProxy. This will set the ActionContext from the ActionInvocation into the ActionContext
* ThreadLocal before invoking the ActionInvocation, then set the old ActionContext back into the ThreadLocal.
*
* @return the result code returned from executing the ActionInvocation
* @throws Exception can be thrown.
* @see ActionInvocation
*/
String execute()
throws
Exception;
/**
* Gets the method name to execute, or <tt>null</tt> if no method has been specified (meaning <code>execute</code> will be invoked).
*
* @return the method to execute
*/
String getMethod();
/**
* Gets status of the method value's initialization.
*
* @return true if the method returned by getMethod() is not a default initializer value.
*/
boolean
isMethodSpecified();
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