新方式使用IO流

Pom.xml配置

        
            commons-io
            commons-io
            2.6
        

流的调用

        //读取文件数据
        FileInputStream fileInputStream = new FileInputStream("C://Users//86152//Videos//Captures//8608a8fd6e9a3ba0aef49703c5e1ff03.mp4");

        //获取response字节输出流
        ServletOutputStream outputStream = response.getOutputStream();
        //完成流的copy

        //  byte[] buff = new byte[1024];
        //  int len = 0;
        //  while ((len = fileInputStream.read(buff)) != -1){
        //      outputStream.write(buff,0,len);
        //  }
        IOUtils.copy(fileInputStream,outputStream);


        fileInputStream.close();