springboot 头像上传 文件流保存 文件流返回浏览器查看 区分操作系统 windows 7 or linux

//我的会员中心  头像上传接口
/*windows 调试*/
@Value("${appImg.location}")
private String winPathPic;
/*linux 使用*/
@Value("${img.location}")
private String linuxPathPic;

@PostMapping(value = "/file")
public String file() {
    return "file";
}

@ApiOperation(value = "会员头像文件上传")
@ApiImplicitParams({
})
@RequestMapping(value = "/appMbrImgUploadFile", method = RequestMethod.POST)
@ResponseBody
public Object appMbrImgUploadFile(@RequestParam(value = "file") MultipartFile file, HttpServletRequest request) {
    Subject currentUser = SecurityUtils.getSubject();
    ShiroUser shiroUser = null;
    Session session = currentUser.getSession();
    String mobile = session.getAttribute("username") == null ? "" : String.valueOf(session.getAttribute("username"));
    if (mobile.equals("")) {
        return setModelMap(new ModelMap(), HttpCode.EFFECT_OF_TOKEN.value(), "token已经失效，请登录", null);
    }
    SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
    //时间路径
    String fileTime = sdf.format(new Date());
    // 文件名
    String fileName = file.getOriginalFilename();
    // 后缀名
    String suffixName = fileName.substring(fileName.lastIndexOf("."));
    //图片格式校验
    String reg = "(.png)$";
    Pattern pattern = Pattern.compile(reg);
    Matcher matcher = pattern.matcher(suffixName);
    boolean valiRst = matcher.find();
    if (!valiRst) {
        return setModelMap(new ModelMap(), HttpCode.PICTURE_FORMAT_CHECK_EXCEPTION.value(), "图片格式异常", null);
    }
    if (file.isEmpty()) {
        System.out.println("文件为空");
        logger.error("文件流为空异常");
        return setModelMap(new ModelMap(), HttpCode.FILE_STREAM_EMPTY.value(), "文件流为空异常", null);
    }
    //判断操作系统
    String os = System.getProperty("os.name");
    System.out.println(os);
    //定义路径
    String picPathReal="";
    if(os!=null&&os.contains("Windows 7")){
        System.out.println("Windows 7");
        picPathReal=winPathPic;
    }else{
        //linux
        picPathReal=linuxPathPic;
    }
    // 新文件名
    fileName = UUID.randomUUID() + suffixName;
    // 文件目录
    String diectFile=picPathReal+"/"+fileTime;
    File dest = new File(diectFile);
    dest.setWritable( true, false);
    if (!dest.exists()) {
        dest.mkdirs();
    }
    //创建文件 图片
    File filePic = new File(diectFile+File.separator, fileName);
    try {
        file.transferTo(filePic);
    } catch (IOException e) {
        e.printStackTrace();
    }
    LSysMember sysMember = new LSysMember();
    LSysMemberVo userInfo = new LSysMemberVo();
    //返回指定图片文件路径   完整接口地址
    //保存地址处理
    String  savePath="/lSysMember/noLogin/readImageFile?url="+picPathReal+File.separator+fileTime+File.separator+fileName;
    //String filename = "/lSysMember/noLogin/readImageFile?url="+savePath+File.separator + fileTime + File.separator + fileName;
    //查询会员基本信息
    sysMember = memberService.findLoginMemberInfo(mobile);
    //执行更新头像更新操作
    sysMember.setAvatar(savePath);
    try {
        sysMember = memberService.appMbrImgUploadFile(sysMember);
        userInfo = memberService.findLoginMemberInfoByMobile(mobile);
    } catch (Exception e) {
        logger.error("请求异常----", e);
        throw new CallChainException();
    }
    //更新session
    session.setAttribute("shiroUser", userInfo);
    return setSuccessModelMap(savePath);
}

@ApiOperation(value = "返回指定地址的文件流")
@ApiImplicitParams({
        @ApiImplicitParam(name = "url", value = "图片地址", required = true,
                paramType = "query", defaultValue = "\20180912\7cd2e1a3-a087-4e25-aac8-2bdf8e274c6f.png"),
})
@RequestMapping(value = "/noLogin/readImageFile",method =RequestMethod.GET)
@ResponseBody
public void getUrlFile(String url, HttpServletRequest request, HttpServletResponse response) {
    File file = new File(url);
    // 后缀名
    String suffixName = url.substring(url.lastIndexOf("."));
    //判断文件是否存在如果不存在就返回默认图标
    if (!(file.exists() && file.canRead())) {
        file = new File(request.getSession().getServletContext().getRealPath("/")
                + "resource/icons/auth/root.png");
    }
    FileInputStream inputStream = null;
    try {
        inputStream = new FileInputStream(file);
        byte[] data = new byte[(int) file.length()];
        int length = inputStream.read(data);
        inputStream.close();
        //setContentType("text/plain; charset=utf-8"); 文本
        response.setContentType("image/png;charset=utf-8");
        OutputStream stream = response.getOutputStream();
        stream.write(data);
        stream.flush();
        stream.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}