基于JavaMail的Java实现简单邮件发送功能

下面是详细攻略：

JavaMail介绍

JavaMail是一种在Java平台上发送和接收电子邮件的API。JavaMail被设计用于打理所有与邮件相关的任务，包括发送、接收、查看或删除邮件等操作。JavaMail的主要功能如下：

• 连接邮件服务器
• 发送邮件
• 接收邮件
• 删除邮件

Java实现简单邮件发送功能

在Java中要使用JavaMail实现邮件发送功能，需要进行如下步骤：

1. 下载并导入JavaMail的jar包

2. 创建一个JavaMail Session

```
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.port", "587");
props.put("mail.smtp.auth", "true");

Session session = Session.getInstance(props, new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("your_email_here", "your_email_password_here");
}
});
```

1. 创建一个MimeMessage

Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("your_email_here"));
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toEmail));
message.setSubject("邮件标题");
message.setText("邮件正文");

1. 发送消息

Transport.send(message);

基于上述步骤，我们可以写出如下的Java代码来发送邮件

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class EmailSender {
  public static void main(String[] args) {

    String toEmail = "recipient_email_address_here";

    Properties props = new Properties();
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.port", "587");
    props.put("mail.smtp.auth", "true");

    Session session = Session.getInstance(props, new javax.mail.Authenticator() {
      protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication("your_email_address_here", "your_email_password_here");
      }
    });

    try {
      Message message = new MimeMessage(session);
      message.setFrom(new InternetAddress("your_email_address_here"));
      message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toEmail));
      message.setSubject("Test");
      message.setText("This is a test Email message");

      Transport.send(message);

      System.out.println("Email sent successfully!");

    } catch (MessagingException e) {
      throw new RuntimeException(e);
    }
  }
}

示例说明

下面给出两个简单的示例，让你更好地了解JavaMail发送邮件的具体流程：

1. 示例1：单个收件人

```
import java.util.;
import javax.mail.;
import javax.mail.internet.*;

public class EmailSender1 {
public static void main(String[] args) {

  String toEmail = "recipient_email_address_here";

  Properties props = new Properties();
  props.put("mail.smtp.host", "smtp.gmail.com");
  props.put("mail.smtp.port", "587");
  props.put("mail.smtp.auth", "true");

  Session session = Session.getInstance(props, new javax.mail.Authenticator() {
    protected PasswordAuthentication getPasswordAuthentication() {
      return new PasswordAuthentication("your_email_address_here", "your_email_password_here");
    }
  });

  try {
    Message message = new MimeMessage(session);
    message.setFrom(new InternetAddress("your_email_address_here"));
    message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toEmail));
    message.setSubject("Test");
    message.setText("This is a test Email message");

    Transport.send(message);

    System.out.println("Email sent successfully!");

  } catch (MessagingException e) {
    throw new RuntimeException(e);
  }
}

}
```

1. 示例2：多个收件人

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class EmailSender2 {
  public static void main(String[] args) {

    String[] toEmails = {"recipient_email_address_1_here", "recipient_email_address_2_here", "recipient_email_address_3_here"};

    Properties props = new Properties();
    props.put("mail.smtp.host", "smtp.gmail.com");
    props.put("mail.smtp.port", "587");
    props.put("mail.smtp.auth", "true");

    Session session = Session.getInstance(props, new javax.mail.Authenticator() {
      protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication("your_email_address_here", "your_email_password_here");
      }
    });

    try {
      Message message = new MimeMessage(session);
      message.setFrom(new InternetAddress("your_email_address_here"));

      InternetAddress[] toAddresses = new InternetAddress[toEmails.length];
      for(int i = 0; i < toEmails.length; i++){
        toAddresses[i] = new InternetAddress(toEmails[i]);
      }

      message.setRecipients(Message.RecipientType.TO, toAddresses);
      message.setSubject("Test");
      message.setText("This is a test Email message");

      Transport.send(message);

      System.out.println("Email sent successfully!");

    } catch (MessagingException e) {
      throw new RuntimeException(e);
    }
  }
}

以上就是基于JavaMail的Java实现简单邮件发送功能的完整攻略，希望对你有所帮助。