java从服务器下载文件 在用响应流的方式返回给前端下载

但是中文名称的文件 在下载的时候会出现 下划线

 

用他们的new String(fileName.getBytes(), "ISO8859-1") 就变成乱码了 

我用的是 URLEncoder.encode（）完美解决乱码

        String filename = file.getName();
        // 以流的形式下载文件。
        InputStream fis = null;
        try {

            response.reset();
//            response.addHeader("Access-Control-Allow-Origin", "*");
//            response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
//            response.addHeader("Access-Control-Allow-Headers", "Content-Type");
//            response.addHeader("Access-Control-Expose-Headers", "Content-Disposition");
            response.addHeader("Content-Length", "" + file.length());
            OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
            response.setContentType("application/octet-stream");
//            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/msexcel");
            response.setContentType("application/vnd.ms-excel");
            response.addHeader("content-disposition", "attachment;filename=" +URLEncoder.encode(filename, "UTF-8"));
            response.setHeader("filename", filename);

            fis = new BufferedInputStream(new FileInputStream(destPath));
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            toClient.write(buffer);
            toClient.flush();
            toClient.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

如果要返回流给前端的 

//            response.addHeader("Access-Control-Allow-Origin", "*");
//            response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
//            response.addHeader("Access-Control-Allow-Headers", "Content-Type");
//            response.addHeader("Access-Control-Expose-Headers", "Content-Disposition")

必须要注释掉 不然会出现跨域的问题

注：不要在swaager进行调试下载 就算设置好了 在swagger返回的文件名 也是乱码