在文件下载中出现了问题:
下载.txt可以正常显示,如用.jpg下载后却无法显示;
为此我把原来的ContenType的octet_stream改成了image/jpeg;
效果还是一样不知什么原因.

<%@ page import="java.io.*"%>
<%
  String root=application.getRealPath("/";
  String name=request.getParameter("name";
  String path=request.getParameter("path";

response.setContentType("image/jpeg";
response.setHeader("Content-Disposition",
"attachment; filename=\"" +name+ "\"";

FileInputStream fileInputStream =
new FileInputStream(root + path);

int i;
while ((i=fileInputStream.read()) != -1) {
out.write(i);
}
fileInputStream.close();
out.close();
%>

用jspSmartUpload包试试

那个只支持文本流,加一句就OK 了.response.getOutputStream()
用jspSmartUpload的话感觉调用数据库不方便.

下载的时候 出现这个问题,是怎么回事?
getOutputStream() has already been called for this response

现在这种东西很多，没有必要自己写了．

response.setContentType("application/download";