java - Java Mail 找不到类 MimeMessage
问题描述
这是Mail类的代码(里面有一个main,但原因很简单,这样解决这个问题似乎很简单):
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;
public class Mail {
public static void main(String [] args) {
// Recipient's email ID needs to be mentioned.
String to = "abcd@gmail.com";
// Sender's email ID needs to be mentioned
String from = "mail";
String psw = "password";
// Assuming you are sending email from localhost
String host = "localhost";
// Get system properties
Properties properties = System.getProperties();
// Setup mail server
properties.setProperty("mail.smtps.host", host);
properties.setProperty("mail.user", from);
properties.setProperty("mail.password", psw);
// Get the default Session object.
Session session = Session.getDefaultInstance(properties);
try {
// Create a default MimeMessage object.
MimeMessage message = new MimeMessage(session);
// Set From: header field of the header.
message.setFrom(new InternetAddress(from));
// Set To: header field of the header.
message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
// Set Subject: header field
message.setSubject("This is the Subject Line!");
// Now set the actual message
message.setText("This is actual message");
// Send message
Transport.send(message);
System.out.println("Sent message successfully....");
} catch (MessagingException mex) {
mex.printStackTrace();
}
}
}
这是我在运行后看到的终端:
Exception in thread "main" java.lang.NoClassDefFoundError: javax/activation/DataSource
at Mail.main(Mail.java:35)
Caused by: java.lang.ClassNotFoundException: javax.activation.DataSource
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
... 1 more
Process finished with exit code 1
错误是:
MimeMessage 消息 = 新的 MimeMessage(会话);
解决方案
您要么需要告诉 JDK 9 公开包含但隐藏的 java.activation 模块,要么需要在项目中显式包含 JavaBeans 激活框架 (JAF; javax.activation) jar 文件。
--add-modules java.activation
通过添加到java
命令行来执行前者。
后者可以通过使用这个 Maven 依赖项来完成:
<dependency>
<groupId>com.sun.activation</groupId>
<artifactId>javax.activation</artifactId>
<version>1.2.0</version>
</dependency>
推荐阅读
- python - python - 如何通过python中选择列右侧的每一行中的nans数对数据框进行子集化?
- javascript - angular-highcharts 和 highcharts-angular 有什么区别?
- python - Colab:Plotly 中的 Python 和 Sankey
- ios - 当结构作为参数传递时会发生什么?
- python - python-按字母顺序/类型/索引对列表进行排序
- c - C:在执行任何操作之前打印出多个线程的 ID?
- tableau-api - 实验的相对提升 - Tableau
- ios - 使用苹果按钮登录不触发目标功能
- sql - SQL 查询中的虚拟列
- node.js - 如何使用猫鼬推送对象数组