JSP文件下载及出现getOutputStream() has already been called for ...的解决方法

追加：

out.clear();
out = pageContext.pushBody();

例子：

<% @ page contentType = " text/html;charset=gb2312 "  language = " java " %>
<% @ page  import = " java.io.* " %>
< br >
<%
    out.clear();
    out  =  pageContext.pushBody();
    
    response.reset();
      response.setContentType( " application/vnd.ms-excel " );  
      InputStream is  =   new  FileInputStream(request.getParameter( " filepath " ));
      OutputStream outputStream  =  response.getOutputStream();
       int  data  =   - 1 ;  
       while ((data  =  is.read())  !=   - 1 )  ... {
          outputStream.write(data);  
      }
      outputStream.flush();
      outputStream.close();
%>

更多资料请参考：

http://dev2dev.bea.com.cn/bbs/thread.jspa?forumID=121&threadID=29766