java.lang.IllegalStateException：此响应已被调用getOutputStream（） [英] java.lang.IllegalStateException: getOutputStream() has already been called for this response

问题描述

这是我的代码，我收到以下异常

  HTTP状态500  - 无法显示问题报告：java .lang.IllegalStateException：此响应已被调用getOutputStream（）
  

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工作簿= 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（异常e）
 {
} 
终于
 {
 //outStream.close（）; 
} 
 returngenerateReport; 
  

我的 Struts.xml / p>

 < result type =streamname =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，我只是给出一个打开，保存对话框的按钮。
点击该按钮后，我收到例外。

如何避免这种情况？

解决方案

删除关闭％>之间的所有空格和换行符，并打开<％和
使用<％@ page trimDirectiveWhitespaces =true％>在顶部可以解决这个问题。 p>

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

The 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";

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>

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

How to avoid this?

解决方案

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

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