背景：附件是保存在应用服务器上，通过调用download.jsp打开附件.

上挂的HTML附件，在打开的时候，文件后面会被添加上JSP出错信息。如下所示：

java.io.IOException: Illegal to flush within a custom tag

at javax.servlet.jsp.tagext.BodyContent.flush(BodyContent.java:87)

at _oa__html._download._jspService(_download.java(Compiled Code))

at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java)

at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java(Compiled Code))

at oracle.jsp.JspServlet.doDispatch(JspServlet.java(Compiled Code))

at oracle.jsp.JspServlet.internalService(JspServlet.java(Compiled Code))

at oracle.jsp.JspServlet.service(JspServlet.java)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)

at org.apache.jserv.JServConnection.processRequest(JServConnection.java(Compiled Code))

at org.apache.jserv.JServConnection.run(JServConnection.java(Compiled Code))

at java.lang.Thread.run(Thread.java(Compiled Code))

处理过程：打开download.jsp，发现

OutputStream o=response.getOutputStream();

   FileInputStream in=new FileInputStream(filePath + File.separator + filename);
   int n;
   while((n=in.read(b))!=-1){
     o.write(b,0,n);
   }
   in.close();
   out.clear();
   ut = pageContext.pushBody();

红色部分改为如下语句，问题解决。
o.flush();
o.close();

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上挂的HTML附件，在打开的时候，文件后面会被添加上JSP出错信息

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