解决文件下载时文件名乱码在ie和firefox下面表现不一致问题

// 其中 Base64 类来自 org.apache.commons.codec 组件 一个40多k的jar 
public String encodeFileName(HttpServletRequest request, String fileName) throws UnsupportedEncodingException {  
    String agent = request.getHeader("USER-AGENT");  
    if (null != agent && -1 != agent.indexOf("MSIE")) {  
        return URLEncoder.encode(fileName, "UTF-8").replace("+", "%20");  
    }else if (null != agent && -1 != agent.indexOf("Mozilla")) {  
        return "=?UTF-8?B?"+(new String(Base64.encodeBase64(fileName.getBytes("UTF-8"))))+"?=";  
    } else {  
        return fileName;  
    }  
}  

使用例如下载Excel文件。

response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment; filename=\"" + encodeFileName(request, fileName) + "\"");