JavaWeb利用struts实现文件下载时改变文件名称

package com.fenghuo.struts.download;
import java.net.URLEncoder;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DownloadAction;
import com.fenghuo.music.util.FileUtils;
public class DownLoad extends DownloadAction {
@Override
protected StreamInfo getStreamInfo(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
//获取资源文件的名称
String resname = request.getParameter("resname");
//利用struts下载资源
return new DownloadAction.ResourceStreamInfo("audio/x-mpeg", this
.getServlet().getServletContext(), "/resource/music/" + resname);
}
@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
//向浏览器发送消息头，使文件以附件的方式打开，并找到资源名对应的文件名称发送给浏览器
String resname = request.getParameter("resname");
FileUtils fu = new FileUtils(this.getServlet().getServletContext());
Map<String,String> musmap = fu.getMusmap();
String name = musmap.get(resname);
//同时对文件名进行编码。在FireFox下还是有乱码，不明白原因，望指教。
response.setHeader("content-disposition", "attachment;filename="
+ URLEncoder.encode(name, "UTF-8"));
return super.execute(mapping, form, request, response);
}
}