java.lang.IllegalStateException: getOutputStream() 已经为此响应调用

java.lang.IllegalStateException: getOutputStream() has already been called for this response(java.lang.IllegalStateException: getOutputStream() 已经为此响应调用)

问题描述

这是我得到以下异常的代码

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

代码:

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";

我的 Struts.xml 看起来像这样:

My 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>

在 JSP 中，我只是给出了一个按钮，它提供了 open, save 对话框.单击该按钮后，我得到了异常.

In JSP, I am just giving a button which gives me open, save dialog box. After clicking that button I am getting the exception.

如何避免这种情况?

推荐答案

删除关闭 %> 和打开 <% 之间的所有空格和换行符和在顶部使用 <%@page trimDirectiveWhitespaces="true" %> 可以解决这个问题.

Remove all space and linebreaks between closing %> and opening <% and use <%@page trimDirectiveWhitespaces="true" %> at top can solve this issue.

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