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SpringBoot+ThymeLeaf+JPA

前台

　　表单的enctype="multipart/form-data" 不要忘记设置

<input id="image" type="file" name="image" onchange="showPhoto(this)">

后台

　　SpringMVC使用MultipartFile来接收前台传入的文件

//常量建议配置在properties配置文件中,这里先这样凑合用.
final static String LOCAL_FILE_LOCATION = "C:/project_image/test/";

@RequestMapping("/editUser")
@ResponseBody
public String editUser(User user, MultipartFile image, Model m, HttpSession session) throws IOException{
    //文件的字节数组和原文件名
    byte[] bytes = image.getBytes();
    String originalFilename = image.getOriginalFilename();

    //截取文件名和后缀
    int pointIndex = originalFilename.lastIndexOf(".");
    String firstFileName = originalFilename.substring(0, pointIndex);
    String lastFileName = originalFilename.substring(pointIndex);

    //用随机数字和日期拼接新文件名
    String timeString = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
    StringBuffer newNameSB = new StringBuffer(UUID.randomUUID().toString()).append(timeString);

    String newFileName = newNameSB.toString();

    //把文件的字节数组保存到本地
    FileOutputStream fileOutputStream = new FileOutputStream(LOCAL_FILE_LOCATION + newFileName);
    fileOutputStream.write(bytes);
    fileOutputStream.flush();
    fileOutputStream.close();

    //给User注值
    User sessionUser = (User) session.getAttribute("user");
    user.setImageName(newFileName);
    user.setImageSuffix(lastFileName);
    user.setId(sessionUser.getId());

    //持久化
    User res = us.saveEdit(user);

    if(res == null){
        m.addAttribute("info", "修改失败!");
    }else {
        //持久化后更新session的信息
        session.setAttribute("user",res );
        m.addAttribute("info", "修改成功!");
    }
    return "editUser";
}

　　

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