Struts2 ActionContext

[chinalwb]

各位大侠，

我有一个小问题，关于ActionContext对象，他是什么时候被创建的呢，在同一个请求中会出现多个ActionContext吗？

更详细的情况是这样的。
在一个action中，我include了另外一个action，在include之前呢我打印ActionContext 和 include之后打印的ActionContext居然不是同一个对象！

代码如下：
struts.xml:

<struts>
	<constant name="struts.enable.DynamicMethodInvocation" value="false" />
	<constant name="struts.enable.SlashesInActionNames" value="true" />
	<constant name="struts.devMode" value="false" />


	<package name="default" extends="struts-default" namespace="/">
		<action name="test" class="com.bv.test.TestAction1" >
			<result name="success">/index.jsp</result>
		</action>
		<action name="x" class="com.bv.test.TestActionX">
			<result name="success">/index.jsp</result>
		</action>
	</package>
</struts>

TestAction1.java

package com.bv.test;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;


public class TestAction1 {

  public String execute() {

    ActionContext ac = ActionContext.getContext();
    System.out.println("Before including: the action context is : " + ac);
    HttpServletRequest request = ServletActionContext.getRequest();
    HttpServletResponse response = ServletActionContext.getResponse();
    System.out.println("Before including: the response is : " + response);
    
    ResponseImpl myResponse = new ResponseImpl(response);
    RequestDispatcher rd = request.getRequestDispatcher("/x.action");
    try {
      rd.include(request, myResponse);  
      String s = myResponse.getOutput();  
      System.out.println("get from response: " + s);  
    }  
    catch (Exception e) {
      e.printStackTrace();  
    }
    
    ac = ActionContext.getContext();
    System.out.println("After including : the action context is : " + ac);
    response = ServletActionContext.getResponse();
    System.out.println("After including : the response is : " + response);
    
    
    ServletActionContext.setResponse(response);
    return "success";
  }
}

ResponseImpl.java:

package com.bv.test;

import java.util.Locale;
import java.io.StringWriter;
import java.io.PrintWriter;
import java.io.OutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import javax.servlet.http.Cookie;
import javax.servlet.jsp.JspWriter;

/**
 * 
 * 
 */
public class ResponseImpl extends HttpServletResponseWrapper  {

  //=========================================================
  // Private fields.
  //=========================================================

  private ServletOutputStream outputStream = null;

  private ByteArrayOutputStream byteArrayOutputStream = null;

  private StringWriter stringWriter = null;

  private PrintWriter printWriter = null;

  private HttpServletResponse _response = null;

  private String contentType= "text/html";

  private String encoding = "UTF-8";

  /**
   *
   */
  class ServletOutputStream extends javax.servlet.ServletOutputStream {

    private OutputStream outputStream = null;

    /**
     *
     */
    ServletOutputStream(ByteArrayOutputStream outputStream) {
      super();
      this.outputStream = outputStream;
    }

    /**
     *
     */
    public void write(int b) throws IOException {
      this.outputStream.write(b);
    }
  }

  //=========================================================
  // Public constructors and methods.
  //=========================================================

  /**
   *
   */
  public ResponseImpl(HttpServletResponse response) {
    super(response);
    this._response = response;
  }

  /**
   *
   */
  public String getOutput() {
    if (this.stringWriter != null) {
      return this.stringWriter.toString();
    }

    if (this.byteArrayOutputStream != null) {
      try {
        return this.byteArrayOutputStream.toString(this.encoding);
      }
      catch (UnsupportedEncodingException e) {
      }
      return this.byteArrayOutputStream.toString();
    }

    return null;
  }

  //=========================================================
  // Implements HttpServletResponse interface.
  //=========================================================

  public void addCookie(Cookie cookie) {
  }

  public void addDateHeader(String name, long date) {
  }

  public void addHeader(String name, String value) {
  }

  public void addIntHeader(String name, int value) {
  }

  public boolean containsHeader(String name) {
    return false;
  }

  public String encodeRedirectURL(String url) {
    if (null != this._response) {
      url = this._response.encodeRedirectURL(url);
    }
    return url;
  }

  public String encodeURL(String url) {
    if (null != this._response) {
      url = this._response.encodeURL(url);
    }
    return url;
  }

  public void sendError(int sc) {
  }

  public void sendError(int sc, String msg) {
  }

  public void sendRedirect(String location) {
  }

  public void setDateHeader(String name, long date) {
  }

  public void setHeader(String name, String value) {
  }

  public void setIntHeader(String name, int value) {
  }

  public void setStatus(int sc) {
  }

  public void resetBuffer() {
  }

  //=========================================================
  // Implements deprecated HttpServletResponse methods.
  //=========================================================

  public void setStatus(int sc, String sm) {
  }

  //=========================================================
  // Implements deprecated HttpServletResponse methods.
  //=========================================================

  public String encodeRedirectUrl(String url) {
    return encodeRedirectURL(url);
  }

  public String encodeUrl(String url) {
    return encodeURL(url);
  }

  //=========================================================
  // Implements ServletResponse interface.
  //=========================================================

  public void flushBuffer() {
  }

  public int getBufferSize() {
    return 0;
  }

  public String getCharacterEncoding() {
    return this.encoding;
  }

  public String getContentType() {
    return this.contentType;
  }

  public Locale getLocale() {
    return null;
  }

  public javax.servlet.ServletOutputStream getOutputStream() {
    if (this.outputStream == null) {
      this.byteArrayOutputStream = new ByteArrayOutputStream();
      this.outputStream =
        new ServletOutputStream(this.byteArrayOutputStream);
    }
    return this.outputStream;
  }

  public PrintWriter getWriter() {
    if (this.printWriter == null) {
      this.stringWriter = new StringWriter();
      this.printWriter = new PrintWriter(this.stringWriter);
    }
    return this.printWriter;
  }

  public boolean isCommitted() {
    return false;
  }

  public void reset() {
  }

  public void setBufferSize(int size) {
  }

  public void setCharacterEncoding(String charset) {
  }

  public void setContentLength(int len) {
  }

  public void setContentType(String type) {
    int needle = type.indexOf(";");
    if (-1 == needle) {
      this.contentType = type;
    }
    else {
      this.contentType = type.substring(0, needle);
      String pattern = "charset=";
      int index = type.indexOf(pattern, needle);
      if (-1 != index) {
        this.encoding = type.substring(index + pattern.length());
      }
    }
  }

  public void setLocale(Locale locale) {
  }
}

TestActionX:

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;

public class TestActionX {  

  public String execute() {
    ActionContext ac = ActionContext.getContext();
    System.out.println("In TestAction X : the action context is : " + ac);
    
    HttpServletResponse response = ServletActionContext.getResponse();
    System.out.println("In TestAction X : the response is : " + response);
    return "success";
  }
}

访问/myapp/test后，控制台打印如下：
Before including: the action context is : com.opensymphony.xwork2.ActionContext@f0b51d
Before including: the response is : org.apache.catalina.connector.ResponseFacade@1320a41
In TestAction X : the action context is : com.opensymphony.xwork2.ActionContext@7a3e72
In TestAction X : the response is : com.bv.test.ResponseImpl@199ae9c
get from response: <h1>Test!</h1>
After including : the action context is : com.opensymphony.xwork2.ActionContext@1cda7e7
After including : the response is : com.bv.test.ResponseImpl@199ae9c


还望各位不吝赐教！在include前后，ActionContext 为什么会不一样呢？怎么样才能一样呢？

谢谢各位！

[chinalwb]

ActionContext struts2ActionContext = ActionContext.getContext(); // include here! ActionContext.setContext(struts2ActionContext); 问题解决。