java发送邮件代码

package com.test.mail;

import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class SendMail {
public static void main(String[] args) {
  try {
   String username="[e-mail]";
   String password="xxxxx";
   String smtp_server="smtp.163.com";
   String from_mail_address=username;
   String to_mail_address="[e-mail]";
  
   Authenticator auth = new PopupAuthenticator(username,password);

   Properties mailProps = new Properties();
   mailProps.put("mail.smtp.auth", "true");

   mailProps.put("username", username);

   mailProps.put("password", password);

   mailProps.put("mail.smtp.host", smtp_server);
   Session mailSession = Session.getDefaultInstance(mailProps, auth);
   MimeMessage message = new MimeMessage(mailSession);
   message.setFrom(new InternetAddress(from_mail_address));
   message.setRecipient(Message.RecipientType.TO, new InternetAddress(to_mail_address));
   message.setSubject("Mail Test");

   MimeMultipart multi = new MimeMultipart();
   BodyPart textBodyPart = new MimeBodyPart();
   textBodyPart.setText("电子邮件测试内容!");
   multi.addBodyPart(textBodyPart);
   message.setContent(multi);
   message.saveChanges();
   Transport.send(message);
  } catch (Exception ex) {
   System.err.println("邮件发送失败的原因是：" + ex.getMessage());
   System.err.println("具体错误原因：");
   ex.printStackTrace(System.err);
  }
}

}

class PopupAuthenticator extends Authenticator {
private String username;
private String password;
public PopupAuthenticator(String username,String password){
  this.username=username;
     this.password=password;
}
public PasswordAuthentication getPasswordAuthentication() {
  return new PasswordAuthentication(this.username, this.password);
}
}