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();
     }
 }

来源： https://www.cnblogs.com/javajetty/p/9655612.html

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