jsp头像修改

<form action="uploadAvatar" method="post" enctype="multipart/form-data">
    <input type="file" name="avatar" accept="image/*" required>
    <button type="submit">上传头像</button>
</form>

@WebServlet("/uploadAvatar")
@MultipartConfig(fileSizeThreshold = 1024 * 1024 * 2, // 2MB
                 maxFileSize = 1024 * 1024 * 10,      // 10MB
                 maxRequestSize = 1024 * 1024 * 50)   // 50MB
public class UploadAvatarServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Part filePart = request.getPart("avatar");
        String fileName = Paths.get(filePart.getSubmittedFileName()).getFileName().toString(); // 获取文件名
        InputStream fileContent = filePart.getInputStream();

        // 保存文件到服务器
        String uploadPath = getServletContext().getRealPath("") + File.separator + "uploads";
        Files.copy(fileContent, new File(uploadPath + File.separator + fileName).toPath(), StandardCopyOption.REPLACE_EXISTING);

        // 更新数据库中的用户头像路径
        String userId = (String) request.getSession().getAttribute("userId");
        updateUserAvatarInDatabase(userId, uploadPath + File.separator + fileName);

        response.sendRedirect("profile.jsp");
    }

    private void updateUserAvatarInDatabase(String userId, String avatarPath) {
        // 数据库更新逻辑
    }
}