JAVA获取文件byte数组并输出进行展示和文件下载

 /**
     * 文件下载
     */
    @GetMapping(value = "/download")
    public void download(HttpServletResponse response) {
        //文件路径
        try {
            //文件字节流 JAVA将文件转换成byte数组(byte[]) 参考：https://www.cnblogs.com/pxblog/p/14919037.html
            byte[] file = new byte[1024];
            response.setContentType("application/vnd.ms-word;charset=utf-8");
            response.setHeader("Content-Disposition",
                    "attachment;filename=\"" + new String("文件名包含文件后缀".getBytes("gb2312"), "ISO8859-1"));
            OutputStream out = response.getOutputStream();
            out.write(file);
            out.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

如果只是要请求url进行图片展示，只需要在上面去掉

 response.setContentType("application/vnd.ms-word;charset=utf-8");
                response.setHeader("Content-Disposition",
                        "attachment;filename=\"" + new String(versionPO.getVersionFileName().getBytes("gb2312"), "ISO8859-1"));
                

这部分代码即可