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系统的要求之一是能够上传用户的个人资料图片。它在本地主机中运行良好。我在网上上传的图片正是本地成功上传的图片。这种错误的可能原因是什么？

这是简化的代码（我之前做的代码比较复杂，但是没有代码重复，运行速度也比较快。我简化代码是为了追查问题，但运气不好）

@RequestMapping(value = "/patient_dp.it")
public String uploadPatientDP(HttpSession session, HttpServletRequest request, Model model, @ModelAttribute("form") ArchiveForm form, @RequestParam("id") long id, @RequestParam("key") String key) {
    System.err.println("patient dp");
    String username = session.getAttribute("user").toString();
    session.setAttribute("user", username);

    Patient patient = null; 

    try {
        patient = patientDao.getPatientById(id);
        MultipartFile file = form.getImages().get(0);           
        String absolutePath = null;
        String relativePath = null;
        InputStream inputStream = null;
        OutputStream outputStream = null;
        String fileName_Original = null;
        if (file.getSize() > 0) {
            inputStream = file.getInputStream();
            if (file.getSize() > 100000) {
                System.out.println("File Size:::" + file.getSize());
                return "redirect:/upload_prof_pic_assembler?id=" + id + "&key=" + key;
            }
            fileName_Original = file.getOriginalFilename();
            System.out.println("size::" + file.getSize());
            relativePath = "images/profilepic/" + fileName_Original;
            absolutePath = request.getSession().getServletContext().getRealPath("") + "/" + relativePath;
            outputStream = new FileOutputStream(absolutePath);
            System.out.println("fileName:" + file.getOriginalFilename());

            int readBytes = 0;
            byte[] buffer = new byte[100000];
            while ((readBytes = inputStream.read(buffer, 0, 100000)) != -1) {
                outputStream.write(buffer, 0, readBytes);
            }
            outputStream.close();
            inputStream.close();

        }       

        patient.setRelativePath(relativePath);
        patient.setFileName(fileName_Original);
        patientDao.update(patient);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }       

    return "redirect:/view_patient_profile.it?id=" + patient.getId();
}

在上传图片jsp中，效果很好

<c:when test="${patient != null }">
                        <form:form action="patient_dp.it?id=${patient.id }&key=p" method="post" commandName="form" enctype="multipart/form-data">
                            Select File: <input type="file" name="images[0]" id="image" onSubmit="return Validate();"/>
                            <a href=""><span class="btn"><input type="submit" value="Upload" class="btnNew"></span></a>                     
                        </form:form>
                    </c:when>

这是 view-patient-profile.jsp 文件的摘录。由于图像的路径不会保留在 Jelastic (mariadb) 上的在线数据库中，它会转向默认图像。

<c:choose>
    <c:when test="${patient.getRelativePath() == null || patient.getRelativePath().equalsIgnoreCase('null')}">
        <img src="resources/images/img_user.jpg" alt="">
    </c:when>
    <c:otherwise>
        <img src="${patient.getRelativePath() }" alt="${patient.getPersonInfo().getFirstName()}'s profile picture" />
    </c:otherwise>
</c:choose>
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