JSP文件下载时文件名在ie和firefox下面文件名不一致极其超链接中文乱码的问题的改进

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response.setContentType("application/octet-stream;charset=UTF-8");
fileName=java.net.URLEncoder.encode(fileName, "UTF-8");
response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
此时在ie下面点击文件下载的时候能够正确显示中文名称但是此时在firefox下面却显示1_%E4%B8%AD%E6%96%87%E6%96%87%E4%BB%B6123.doc然后我又试了另一种方案

response.setContentType("application/octet-stream;charset=UTF-8");
fileName = new String(fileName.getBytes("UTF-8"),"iso-8859-1");
response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
此时在ie下面下载的时候弹chu的文件名是乱码；而在firefox下面却正确显示1_中文文件XXX.doc。

我想要的是不管是ie还是firefox都正确显示1_中文XX.doc，不知道大家有没有遇到过类似的问题，解决之道是什么？
也许判断浏览器类型来进行不同的处理会是一种解决方案，但是这是一种个人觉得迫不得已的解决方案。

=================工具类=============================
package com.jub.jubweb1.JTool;

import javax.servlet.http.HttpServletRequest;

public class JToolWeb {

//文件下载时文件名在ie和firefox下面表现不一致问题，乱码
public static String processFileName(HttpServletRequest request,String fileNames){
String codedfilename = null;
try{
String agent =request.getHeader("USER-AGENT");
if(null != agent && -1 != agent.indexOf("MSIE")){//ie
String prefix = fileNames.lastIndexOf(".")!=-1?fileNames.substring(0,fileNames.lastIndexOf(".")):fileNames;
String extension = fileNames.lastIndexOf(".")!=-1?fileNames.substring(fileNames.lastIndexOf(".")):"";
String name = java.net.URLEncoder.encode(fileNames, "UTF8");
if(name.lastIndexOf("%0A")!=-1){
name = name.substring(0,name.length()-3);
}
int limit = 150 - extension.length();//文件名超过 17 个中文字符，在 IE 下会有问题
if (name.length() > limit) {
name = java.net.URLEncoder.encode(prefix.substring(0, Math.min(prefix.length(), limit / 9)), "UTF-8");
if(name.lastIndexOf("%0A")!=-1){
name = name.substring(0,name.length()-3);
}
}else{
return name;
}
codedfilename = name + extension;
} else if (null != agent && -1 != agent.indexOf("Mozilla")) {//火狐
codedfilename = "=?UTF-8?B?"+(new String(org.apache.commons.codec.binary.Base64.encodeBase64(fileNames.getBytes("UTF-8"))))+"?=";
}else {
codedfilename = fileNames;
}
}catch(Exception e){
e.printStackTrace();
}
return codedfilename;
}
}

=================================jsp============================================
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<%@ page language="java" contentType="text/html; charset=UTF-8;" import="java.io.*,com.jub.jubweb1.JTool.*" pageEncoding="UTF-8"%>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>下载</title>
</head>
<body>
<%
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html");
//关于文件下载时采用文件流输出的方式处理：
//加上response.reset()，并且所有的％>后面不要换行，包括最后一个；
///response.reset();//可以加也可以不加 ,注意加了之后tomcate需要配置UTF-8否则乱码
String filePath=request.getSession().getServletContext().getRealPath("")+request.getParameter("path");
File file = new File(filePath);
if (!file.exists() || file.isDirectory()) {
filePath=new String(filePath.getBytes("iso-8859-1"),"UTF-8");//防止tomcate编码不一
file = new File(filePath);
if (!file.exists() || file.isDirectory()){//二次验证
%>
<script type="text/javascript" charset="UTF-8">
alert('抱歉，资源正在维护中，请稍后再试,如果有需要请联系我们的客服,谢谢!');
</script>
<%
System.out.print(filePath);
return;
}
}
String fileName=filePath.substring(filePath.lastIndexOf("\\")+1,filePath.length());
System.out.print(fileName);
System.out.print(filePath);
//filename=new String(filename.getBytes("iso8859-1"),"gb2312");//使用超链接解决中文乱码
// 设置响应头和下载保存的文件名
response.setContentType("application/x-download");
//response.addHeader("Content-Disposition","attachment;filename=" +new String(fileName.getBytes("gb2312"),"iso8859-1"));//解决中文乱码
//response.addHeader("Content-Disposition","attachment;filename=" + java.net.URLEncoder.encode(fileName,"utf-8"));//解决中文乱码
String t=JToolWeb.processFileName(request,fileName);
response.addHeader("Content-Disposition","attachment;filename="+t);//解决中文乱码
System.out.println(t+"--------");
response.setContentLength((int)file.length());
java.io.OutputStream outp = null;
java.io.FileInputStream in = null;
try
{
outp = response.getOutputStream();
in = new FileInputStream(file);

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

while((i = in.read(b)) > 0)
{
outp.write(b, 0, i);
}
//
outp.flush();
//要加以下两句话，否则会报错
//java.lang.IllegalStateException: getOutputStream() has already been called for //this response
out.clear();
out = pageContext.pushBody();
}
catch(Exception e)
{
System.out.println("Error!");
e.printStackTrace();
}
finally
{
if(in != null)
{
in.close();
in = null;
}
//这里不能关闭
//if(outp != null)
//{
//outp.close();
//outp = null;
//}
}
%>
</body>
</html>

===========================jsp==================================
<a href='javascript:subFrom("/jubweb1/down/down_stream.jsp","\\download\\erp\\行政管理手册.doc")'>下载</a>

<form id="down_frm" name="down_frm" method="post" target="down_if" style="display:none;">
<input type="hidden" id="path" name="path"/>
</form>
<iframe id="down_if" name="down_if" style="display:none;"></iframe>
<script>

function subFrom(url,param){
$("#path").attr("value",param);
$("#down_frm").attr("action",url);
$("#down_frm").attr("method","post");
$("#down_frm").submit();
}
</script>