文件下载时附件名乱码问题

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/**

     * 查看附件

     */

    public
String view() {

        try
{

            Attachment newAttach = attachService.getAttachment(attach.getId());

            if
(attach != null) {

                try
{                  

                    InputStream inStream = new
FileInputStream(newAttach

                            .getFilePath());

                    this.getResponse().reset();

                    this.getResponse().setContentType("bin");

                    this.getResponse().addHeader(

                            "Content-Disposition",

                            "attachment; filename=\""

                                    + URLEncoder.encode(newAttach.getName(),

                                            "UTF-8").replace("+", "%20") + "\"");

                    // 循环取出流中的数据

                    byte[] b = new
byte[512];

                    int
len;

                    this.getResponse().getOutputStream().flush();

                    while
((len = inStream.read(b)) > 0) {

                        this.getResponse().getOutputStream().write(b, 0, len);

                    }

                    inStream.close();

                } catch
(FileNotFoundException e) {

                    //e.printStackTrace();

                    this.sendMessage("error");

                } catch
(IOException e) {

                    this.sendMessage("error");

                    //e.printStackTrace();

                }

            }

        } catch
(DAOException e) {

            e.printStackTrace();

            this.addActionMessage(e.getMessage());

            return
ERROR;

        }

        return
null;

    }