Struts 2 type="stream" 中文filename如何正常显示

uploadFileName = java.net.URLDecoder.decode(uploadFileName,"ISO8859-1");

<result name="downLoadFile" type="stream">
<param name="inputName">inputStream</param>
<param name="contentType">${uploadContentType}</param>
<param name="contentDisposition">attachment;filename=${uploadFileName}</param>
<param name="bufferSize">1024</param>
</result>

貌似

java.net.URLDecoder.decode(uploadFileName,"ISO8859-1");

必须写ISO8859-1

我试了UTF-8不行就不行。

而<param name="contentType">${uploadContentType}</param>加不加charset="ISO8859-1";不影响乱码
甚至写成

uploadFileName = java.net.URLDecoder.decode(uploadFileName,"ISO8859-1");
<param name="contentType">${uploadContentType};charset="UTF-8"</param>