Java 解决IE浏览器下载文件，文件名出现乱码问题

Posted 2020-10-25 freeLife

 /**
     * 区分ie 和其他浏览器的下载文件乱码问题
     * @param request
     * @param fileName
     * @return
     */
    public String getFileName(HttpServletRequest req,String fileName){
        String userAgent = req.getHeader("user-agent");
        userAgent = userAgent ==null?"":userAgent.toLowerCase();
        String name = fileName;
        try {
　　　　　　  //针对IE或者以IE为内核的浏览器：
            if(userAgent.contains("msie") ||userAgent.contains("trident")){
                name = URLEncoder.encode(name, "UTF-8");
            }else{
                name = new String(name.getBytes(), "iso-8859-1"); 
            }
        } catch (Exception e) {
            throw new SysException(ERRORConstants.COMMON_SYSTEM_ERROR, e);
        }
        return name;
    }

  网上很多例子是用 msie  和like Gecko  来做区分，说ie11去除了msie;

 亲自测试 谷歌浏览器也带like Gecko,ie11的 msie没有移除，并且带有trident标记

结论是 不用用like Gecko来做区分,最后

public void exportExcel(HttpServletRequest req,HttpServletResponse response) {
        try{
              response.setContentType("application/octet-stream");
              String excelName = "文件名";
              response.addHeader("Content-Disposition", "attachment;filename="+getFileName(req,excelName)+".xls");
              OutputStream out = response.getOutputStream();
              testService.export(out);
          }catch(Exception e){
//
          }      
    }