Java处理文件流传给前端接收

需求:后端直接传输文件的流给前端处理

一、
public void transfer(HttpServletResponse res) throws Exception {
    File f = new File(path);//path 文件的相对路径
    ServletOutputStream outputStream = res.getOutputStream();
    outputStream.write(FileUtil.readBytes(f));//hutool 工具类 FileUtil
    //强制将缓存区的数据进行输出
     outputStream.flush();
     //关流
     outputStream.close();
}
 
二、
public void transfer(HttpServletResponse res) throws Exception {
    File f = new File(path);//path 文件的相对路径
    nputStream in = new FileInputStream(f);
    ServletOutputStream outputStream = res.getOutputStream();
    byte[] buff = new byte[1024];
    int n;
    while ((n = in.read(buff)) != -1) {
          //将字节数组的数据全部写入到输出流中
          outputStream.write(buff, 0, n);
        }
    //强制将缓存区的数据进行输出
    outputStream.flush();
    //关流
    outputStream.close();
}