读取图片

@GetMapping("uploadHeader/{fileName}")
public void getHeader(@PathVariable("fileName")String fileName,HttpServletResponse response){
    //服务器存放路径
    fileName=uplodePath+"/"+fileName;
    //文件后缀
    String suffix=fileName.substring(fileName.lastIndexOf("."));
    //响应图片
    response.setContentType("image/"+suffix);
    try {
        OutputStream os=response.getOutputStream();
        FileInputStream file=new FileInputStream(fileName);
        byte[] buffer=new byte[1024];
        int b=0;
        while ((b=file.read(buffer)) !=-1){
            os.write(buffer,0,b);
        }
    } catch (IOException e) {
        logger.error("读取失败"+e.getMessage());
        e.printStackTrace();
    }
}