费话不多说,看代码:

1.这是调用外代码:
<a href="util/downLoadFileServlet?path=文件路径&name=显示的文件名">

2.下面是Servlet:
        response.reset();
        response.setContentType("binary/octet-stream");
        String path = request.getSession().getServletContext().getRealPath("");
        path += "\\";
        String file = request.getParameter("path");
        String filedownload = path + file;
        String filedisplay = new String(s.getBytes("iso-8859-1"),"utf-8");        

        filedisplay = URLEncoder.encode(filedisplay, "gb2312");

        response.setHeader("Content-Disposition", "attachment;filename=" + filedisplay);


        OutputStream outp = null;
        FileInputStream in = null;

        try
        {
            outp = response.getOutputStream();
            in = new FileInputStream(filedownload);

            byte[] b = new byte[1024];
            int i = 0;

            while ((i = in.read(b)) > 0)
            {
                outp.write(b, 0, i);
            }
            //outp.flush();
        }
        catch (Exception e)
        {
            System.out.println("Error!");
            e.printStackTrace();
        }
        finally
        {
            if (in != null)
            {
                in.close();
                in = null;
            }
            if (outp != null)
            {
                outp.close();
                outp = null;
            }
        }
3.下载时主要的问题:
  直接点击链接:弹出世界之窗的下载(图1),名字显示正常,点"下载"后文件下载成功,可是名字变为(图2)名字出错
  如果在(图1)的文件名处手动输入"一二三.bmp"或COPY一下框里的内容再粘贴,下载后显示就正常了.

  用右键目标另存为下载名字则变为(图3)
4.请高手帮帮忙,我只有20分,谢谢大家了!!

图1

图2

图3

刚才又试了下
把filedisplay = URLEncoder.encode(filedisplay, "gb2312");
改为filedisplay = URLEncoder.encode(filedisplay, "UTF-8");
则在目标另存为的框内文件名显示正常
看来,目标别存为的框用的是UTF-8编码
世界之窗的框用的是GB2312的.
这可怎么办啊!!!大家帮帮我啊!

高手呢?在不在?大大呢?

首先谢谢你的回答,试了一下,还是不行. 您再帮帮看看,应该注意些什么地方?
等结贴时给分.

哎,没人看了,谢谢上面的回答啦,分给了