Java工具类解决IE浏览器下载文件名乱码

import org.apache.commons.lang.StringUtils;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;



public class Garbled {
    public static void setFileDownloadHeader(HttpServletRequest request, HttpServletResponse response, String fileName)  {
        final String userAgent = request.getHeader("USER-AGENT");

            response.setContentType("application/octet-stream; charset=utf-8");

            if (userAgent != null && userAgent.indexOf("Firefox") >= 0 || userAgent.indexOf("Chrome") >= 0 || userAgent.indexOf("Safari") >= 0) {
                try {
                    fileName = "=?UTF-8?B?" + (new String(org.apache.commons.net.util.Base64.encodeBase64(fileName.getBytes("UTF-8")))) + "?=";//该行代码也可以使用下面的代码来代替：
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
                //fileName = "=?UTF-8?B?" + (new String(com.ghj.packageoftool.Base64.encode(fileName.getBytes("UTF-8")))) + "?=";
            } else {
                try {
                    fileName = new String(fileName.getBytes("GBK"), "ISO-8859-1");
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
            }
            response.setHeader("Content-Disposition", "attachment; filename=" + fileName);