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From Mike Rooney <>
Subject ServletOutputStream
Date Tue, 29 Jul 2008 22:06:15 GMT
I created a small webapp that extracts data from a DB, creates an Excel file from that data
(using Apache POI), which then streams the file to the end user's browser.  Everything is
working fine, however I have to set the Action class' return type to 'NULL' since I am setting
the servlet response type to 'application/vnd-ms-excel'.  I want to change my application
so that it returns to a 'status completed' page when the extraction is completed. However
I cannot do this when I set the return type is null.  How can I do this? 

Here is my code... 

public class ExtractAction extends ActionSupport { 
  public String execute() throws Exception { 
    HSSFWorkbook wb = new HSSFWorkbook(); 
    HSSFSheet prodSheet = wb.createSheet("PROD"); 
    HSSFSheet devSheet = wb.createSheet("DEV"); 
    HSSFSheet testSheet = wb.createSheet("TEST"); 
    HttpServletResponse response = ServletActionContext.getResponse(); 
    ServletOutputStream outstream = response.getOutputStream(); 
  return null; 
  //return SUCCESS 

and my struts.xml 


  <constant name="struts.enable.DynamicMethodInvocation" value="false" /> 
  <constant name="struts.devMode" value="false" /> 
  <package name="default" extends="struts-default"> 
    <action name="Extractor" class="action.ExtractAction"> 
      <result name="success">/example/index.jsp</result> 

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