如何使用 servlet 在数据库中添加默认照片？

Question

如果用户没有手动上传任何照片，如何在数据库中添加默认照片？

我正在使用此代码来处理用户上传的照片：

InputStream inputStream = null;

// obtains the upload file part in this multipart request
Part filePart = request.getPart("photo");

if (filePart != null) {
    // prints out some information for debugging
    System.out.println(filePart.getName());
    System.out.println(filePart.getSize());
    System.out.println(filePart.getContentType());

    // obtains input stream of the upload file
    inputStream = filePart.getInputStream();
}

try
{
    Class.forName("com.mysql.jdbc.Driver");
    Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/busbooking","user","password");
    PreparedStatement ps=con.prepareStatement("INSERT INTO `busbooking`.`users` (`username`, `Full_name`, `email`, `password`, `Mob_no`, `DOB`, `address`, `Gender`, `Usertype`, `Agency_name`, `Photo`) VALUES (?,?,?,?,?,?,?,?,?,?,?)");
    ps.setString(1, username);
    ps.setString(2, FullName);
    ps.setString(3, email);
    ps.setString(4, passwd);
    ps.setString(5, mobile);
    ps.setString(6, dob);
    ps.setString(7, address);
    ps.setString(8, gender);
    ps.setString(9, Usertype);
    ps.setString(10, AgencyName);
    if (inputStream != null) {
        // fetches input stream of the upload file for the blob column
        ps.setBlob(11, inputStream);
    }
    ps.executeUpdate();   

    out.println("<script>alert('Registration Successful');</script>");
    RequestDispatcher rd=request.getRequestDispatcher("LoginPage1.jsp");
    rd.include(request, response);

    ps.close();
    con.close();
}

Answer 1

您可以在数据库表中为 Photo 列设置默认图像，或者如果用户没有上传图像，则从服务器上的某些默认图像照片创建输入流：

  File initialFile = new File("src/main/resources/sample.txt");
  InputStream targetStream = new FileInputStream(initialFile);

示例来源： http://www.baeldung.com/convert-file-to-input-stream