Java.lang.IllegalStateException: getOutputStream () has already been called for this response

Question

Java.lang.IllegalStateException: getOutputStream () has already been called for this response

Here is my code for which I am getting the following exception

HTTP Status 500 - Unable to show problem report: java.lang.IllegalStateException: getOutputStream() has already been called for this response

Code:

WorkbookSettings wbSettings = new WorkbookSettings();    
OutputStream outStream = null;

try
{               
  wbSettings.setLocale(new Locale("en", "EN"));             
  response.setContentType("application/vnd.ms-excel");                  
  outStream= response.getOutputStream();                
  response.setHeader("Content-Disposition", "attachment; filename=/timesheet.xls");             
  WritableWorkbook workbook = Workbook.createWorkbook(outStream, wbSettings);              
  workbook.createSheet("Report", 0);               
  WritableSheet excelSheet = workbook.getSheet(0);              
  service.createLabel(excelSheet);              
  service.createContent(excelSheet);                    
  workbook.write();             
  workbook.close();             
  outStream.flush();               
  outStream.close();                
}               
catch(Exception e)
{
}           
finally
{               
  //outStream.close();      
}   
return "generateReport";

Mine Struts.xml

looks like this

<result type="stream" name="generateReport">                   
 <param name="contentType">"application/vnd.ms-excel"</param>                  
 <param name="inputName">excelstream</param>                  
 <param name="contentDisposition">contentDisposition</param>                   
 <param name="bufferSize">1024</param>              
</result>

In JSP, I just give a button that opens me an open save dialog. After clicking this button, I am getting an exception.

How can you avoid this?

+2

java inputstream jsp download struts2

Akhilesh N Dec 28. '12 at 6:30

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4 answers

Roman C · Answer 1 · 2013-09-05T10:50:04+0000

It's just a syntax error, the server is confused about how to handle this type of content

<param name="contentType">"application/vnd.ms-excel"</param>

change to

<param name="contentType">application/vnd.ms-excel</param>

note, the value param

is a string without double quotes.

So the actual result would be

<result type="stream" name="generateReport">
  <param name="contentType">application/vnd.ms-excel</param>
  <param name="contentDisposition">attachment;filename="timesheet.xls"</param>
  <param name="inputName">excelstream</param>
</result>

the action code must initialize excelstream

and provide the getter before returning the result. workbook

do not write in the answer, let it write in ByteArrayOutputStream

.

private InputStream excelstream;

public InputStream getExcelstream() {
  return excelstream;
}  

public String execute() throws Exception {
  WorkbookSettings wbSettings = new WorkbookSettings();

  try  {  
    ByteArrayOutputStream outstream = new ByteArrayOutputStream();  
    wbSettings.setLocale(new Locale("en", "EN"));        
    WritableWorkbook workbook = Workbook.createWorkbook(outstream, wbSettings);   
    workbook.createSheet("Report", 0);    
    WritableSheet excelSheet = workbook.getSheet(0);    
    service.createLabel(excelSheet);    
    service.createContent(excelSheet);          
    workbook.write();    
    workbook.close();  
    excelstream = new ByteArrayInputStream(outstream.toByteArray());        
  } catch(Exception e) {    
    e.printStackTrace();
    throw e;
  }

  return "generateReport";
}

developerwjk · Answer 2 · 2013-09-06T22:57:34+0000

Remove absolutely all spaces and gaps between closing%> and opening <%. With space in between, you can automatically call getOutputStream (). Since those spaces or lines are split into the output in the browser: it calls getOutputStream () to render.

This is the only way to find this error in JSP. Otherwise, you will have to rewrite the code that returns the binary as a servlet and just use the JSP page as the launch page to send the user to the servlet when the button is clicked.

user2894583 · Answer 3 · 2013-10-18T11:52:19+0000

Remove any spaces and gaps between closing%> and opening <% and using <% @page trimDirectiveWhitespaces = "true"%> at the top can fix this issue.

Quincy · Answer 4 · 2012-12-28T06:47:48+0000

Have you read this?

The parameter inputName

needs to be set inputSteam

, but I don't see it anywhere in your code.

You can customize ByteArrayOutputStream

and save the data to ByteArrayInputStream

as shown below

ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

/** code to write to outputsteam ***/

ByteArrayInputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());

And you don't need to include these codes

response.setContentType("application/vnd.ms-excel");    

outStream= response.getOutputStream();

response.setHeader("Content-Disposition", "attachment; filename=/timesheet.xls");

since you can set the whole thing as a result of the strut action.

Java.lang.IllegalStateException: getOutputStream () has already been called for this response

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