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Код

public class ContentDispositionBuilder {
    private static final String ENCODING = "UTF-8";

    private HttpServletRequest request;

    private HttpServletResponse response;

    private String userAgent;

    public ContentDispositionBuilder(HttpServletRequest request, HttpServletResponse response) {
        this.request = request;
        this.response = response;
    }

    public void build(String originalFileName) throws UnsupportedEncodingException {
        userAgent = request.getHeader("User-Agent").toLowerCase();

        String fileName = buildFileName(originalFileName);

        String fileNameAttr = "filename=";

        if (isIE() || isChrome()) {
            fileName = "\"" + fileName + "\"";

        } else {
            fileNameAttr = fileNameAttr.replace("=", "*=") + ENCODING + "''";
        }

        response.setHeader("Content-Disposition", "attachment;" + fileNameAttr + fileName);
    }

    private String buildFileName(String fileName) throws UnsupportedEncodingException {
        return URLEncoder.encode(fileName, ENCODING).replaceAll("\\+", "%20");
    }

    private boolean isFirefox() {
        return userAgent.contains("gecko");
    }

    private boolean isIE() {
        return userAgent.contains("msie");
    }

    private boolean isOpera() {
        return userAgent.contains("opera");
    }

    private boolean isChrome() {
        return userAgent.contains("webkit");
    }
}