微软excel打开csv文件乱码，wps和txt不乱码，java后台解决

/**
     * 下载CSV文件
     */
    @RequestMapping(value = "/dlcsv/{jobLogId}", method = RequestMethod.POST)
    @ResponseBody
    public Map downloadCSVFile(@PathVariable Long jobLogId, Model model) throws Exception {
        JobLog jobLog = jobLogService.selectById(jobLogId);
        JobConf jobConf=jobConfService.selectOne(new EntityWrapper().eq("job_id",jobLog.getJobId()));
        byte[] file=jobConf.getFilePath();//获取byte数组就是所需内容
        /*String csvCon = new String(file,"GBK");
        byte[] file1=csvCon.getBytes("GBK");
*/

//下载逻辑还有一个js文件

    String csvContext = new String(file,"gb2312");
    //System.out.println(csvContext);
    String fileName = "origin_data.csv";

    Map retmap = new HashMap<>();
    retmap.put("fileContent", "\uFEFF"+csvContext);//解决代码加这一行
   // retmap.put("fileContent", csvContext);
    retmap.put("fileName", fileName);

    return retmap;
}