ssm 框架下的上传文件功能

// 传入一个事故ID
String accidentID = request.getParameter("accidentID");
accidentID = "00520180509002";
if (StringUtils.isEmpty(accidentID))
{
    model.addAttribute("msg", "事故ID为空");
    model.addAttribute("code", 1);
    return model;
}
if (file == null)
{
    model.addAttribute("msg", "上传失败：文件为空");
    model.addAttribute("code", 111);
    return model;
}

// 获得原始文件名
String fileName = file.getOriginalFilename();
System.out.println("原文件名:" + fileName);

// 获取上传文件扩展名
String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length());
// 对扩展名进行小写转换
fileExt = fileExt.toLowerCase();
// 图片文件大小过滤
if (!"jpg".equals(fileExt) && !"png".equals(fileExt) && !"mp4".equals(fileExt))
{
    model.addAttribute("msg", "上传失败:无效的图片/视频类型");
    model.addAttribute("code", 111);
    return model;
}
// long fileSize = file.getSize();
// if (fileSize > (500 * 1024))
// {
// model.addAttribute("msg", "上传失败:文件大小不能超过500K");
// model.addAttribute("code", 111);
// return model;
// }
// 新文件名
String newFileName = UUID.randomUUID() + fileName;

String realPath = request.getServletContext().getRealPath("/");
String realPathParent = (new File(realPath)).getParent();
// 上传位置
String path = realPathParent + "/img/"; // 设定文件保存的目录
File f = new File(path);
if (!f.exists())
    f.mkdirs();
if (!file.isEmpty())
{
    try
    {
        FileOutputStream fos = new FileOutputStream(path + newFileName);
        InputStream in = file.getInputStream();
        int b = 0;
        while ((b = in.read()) != -1)
        {
            fos.write(b);
        }
        fos.close();
        in.close();
    } catch (Exception e)
    {
        e.printStackTrace();
    }
}
management.setAccidentID(accidentID);
List<String> strList = new ArrayList<String>();
List<String> mapList = new ArrayList<String>();
List<String> listMap = new ArrayList<String>();
String pathNew = "/img/" + newFileName;
// 往数据库中插入(路径拼接)数组
String strMap = uploadService.selectPaths(management);
if (StringUtils.isEmpty(strMap))
{
    strList.add(pathNew);
} else
{
    String[] str1 = strMap.split(",");
    for (String list : str1)
    {
        strList.add(list);
    }
    strList.add(pathNew);
}

for (String map : strList)
{
    mapList.add(map);
}

// 集合
System.out.println("上传图片到:" + path + newFileName);
String imgDir = mapList.toString().replace("[", "").replace("]", "");
management.setImgDir(imgDir);
model.addAttribute("code", uploadService.updatePath(management) > 0 ? 0 : 1);

// 返回所有图片的绝对路径
for (String map : strList)
{
    fileExt=map.substring(map.indexOf(".")).replace("]", "");
    switch (fileExt)
    {
    case ".jpg":
        map = map.substring(map.indexOf("img") - 1, map.indexOf(".jpg") + 4);
        break;
    case ".png":
        map = map.substring(map.indexOf("img") - 1, map.indexOf(".png") + 4);
        break;
    case ".mp4":
        map = map.substring(map.indexOf("img") - 1, map.indexOf(".mp4") + 4);
        break;
    default:
        break;
    }
    // 封装图片显示路径（根据当前访问的客户端请求的地址来封装）
    String request_path = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort();
    listMap.add(request_path + map);
}

imgDir = listMap.toString().replace("[", "").replace("]", "");
model.addAttribute("imgDir", imgDir);
model.addAttribute("code", 99);
return null;

}