我在JavaFX应用程序中发送电子邮件时遇到一些问题。当我只是用一个简单的程序（没有GUI）测试发送电子邮件时，一切正常，我能够发送电子邮件。但是，当我将其集成到我的应用程序中时，就会遇到此异常。 引起原因：java.lang.ClassNotFoundException：javax.mail.MessagingException
我添加了jar文件（activation.jar，javax.mail.jar，smtp-1.6.0.jar）。由于它是在我第一次测试时起作用的，所以我不知道如何解决它。
这是源代码：
import com.jfoenix.controls.JFXComboBox;
import com.jfoenix.controls.JFXPasswordField;
import com.jfoenix.controls.JFXTextArea;
import com.jfoenix.controls.JFXTextField;
import dao.classes.KlientiHibernateDao;
import dao.interfaces.KlientiDao;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import javafx.embed.swing.SwingFXUtils;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Alert;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javax.imageio.ImageIO;
import models.Klienti;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import utils.HibernateUtil;
import utils.MyAlert;
import java.util.*;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Transport;
// import javax.mail.*;
import javax.mail.internet.*;
import javax.mail.internet.MimeMessage;
public class EmailViewController implements Initializable {
@FXML
private JFXTextField emailTF;
@FXML
private JFXPasswordField fjalekalimiTF;
@FXML
private JFXComboBox<String> marresiteCB;
@FXML
private JFXTextField subjektiTF;
@FXML
private JFXTextArea mesazhiTA;
@FXML
private ImageView imageView;
private Alert alert;
SceneChanger sc = new SceneChanger();
SessionFactory factory = HibernateUtil.getSessionFactory();
Session session;
Transaction tx;
KlientiDao kdao;
public void butoniSend(ActionEvent event) {
session = factory.getCurrentSession();
tx = session.beginTransaction();
kdao = new KlientiHibernateDao();
kdao.setSession(session);
List<Klienti> klientat = null;
String[] marresit = null;
try {
String host = "smtp.gmail.com";
String user = emailTF.getText();
String pass = fjalekalimiTF.getText();
if (marresiteCB.getValue().startsWith("T")) {
klientat = kdao.findAll();
marresit = new String[klientat.size()];
}
for (int i = 0; i < marresit.length; i++) {
marresit[i] = klientat.get(i).getEmail();
}
String from = emailTF.getText();
String subject = subjektiTF.getText();
String messageText = mesazhiTA.getText();
boolean sessionDebug = false;
Properties props = System.getProperties();
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", host);
props.put("mail.smtp.port", "587");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.required", "true");
java.security.Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
javax.mail.Session mailSession = javax.mail.Session.getDefaultInstance(props, null);
mailSession.setDebug(sessionDebug);
Message msg = new MimeMessage(mailSession);
msg.setFrom(new InternetAddress(from));
InternetAddress[] adresat = new InternetAddress[marresit.length];
for (int i = 0; i < adresat.length; i++) {
adresat[i] = new InternetAddress(marresit[i]);
}
msg.setRecipients(Message.RecipientType.TO, adresat);
msg.setSubject(subject);
msg.setSentDate(new Date());
msg.setText(messageText);
Transport transport = mailSession.getTransport("smtp");
transport.connect(host, user, pass);
transport.sendMessage(msg, msg.getAllRecipients());
transport.close();
alert = MyAlert.returnConfirmationAlert("Alert", "Email shkoi me sukses!");
} catch (MessagingException e) {
alert = MyAlert.returnErrorAlert("Alert", e.getMessage());
System.out.println(e.getMessage());
}
tx.commit();
session.close();
}
@Override
public void initialize(URL url, ResourceBundle rb) {
emailTF.setText("auto.x.prishtina@gmail.com");
emailTF.setEditable(false);
marresiteCB.getItems().addAll("Të gjithë klientët", "Klientët VIP");
subjektiTF.setText("Përshëndetje i/e nderuar!");
mesazhiTA.setText("Përshëndetje i/e nderuar!\n\n" + "Mesazhi i email-it" + "\n\nMe respekt,\nAuto X");
try {
File imgFile = new File("./src/imazhet/icons/email_icon.png");
BufferedImage bufferedImage = ImageIO.read(imgFile);
Image image = SwingFXUtils.toFXImage(bufferedImage, null);
imageView.setImage(image);
} catch (IOException e) {
System.err.println(e.getMessage());
}
}
}
运行时抛出异常：
Caused by: java.lang.ClassNotFoundException: javax.mail.MessagingException
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 73 more
当我在main方法中执行此操作时，它将起作用：
// Parent root = FXMLLoader.load(getClass().getResource("LoginView.fxml"));
Parent root = FXMLLoader.load(getClass().getResource("EmailView.fxml"));
Scene scene = new Scene(root);
pS.setTitle("Login");
pS.setScene(scene);
pS.show();
但是我不想从那个场景运行我的应用程序，我想从登录屏幕运行。
这是我更改屏幕（阶段）的方式：
public class SceneChanger {
/*
This method will accept the the title of the new scene, the .fxml file name
for the view and the ActionEvent that triggered the change
*/
public void changeScenes(ActionEvent event, String viewName, String title, boolean resizable) throws IOException {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource(viewName));
Parent parent = loader.load();
Scene scene = new Scene(parent);
// Get the scene from the event that was passed in
Stage stage = (Stage)((Node)event.getSource()).getScene().getWindow();
stage.setTitle(title);
stage.setScene(scene);
stage.setResizable(resizable);
stage.show();
}
}
我认为这是从这里来的错误：
public void butoniEmailPromocional(ActionEvent event) throws IOException {
sc.changeScenes(event, "EmailView.fxml", "Email promocional", true);
}