Java writes sending mail tool class

Mail sending
smtp mail sending protocol
pop3 mail receiving protocol
First open the SMTP service, using qq mailbox as an example. Then generate an authorization code for secure login.

public class EmailUtil {
    
    
	/*
	 * form 邮件发送方地址
	 * to  邮件接收方地址
	 * username 发送方名称
	 * password 授权码
	 * subject  邮件主题
	 * text  邮件内容
	 */
	public static int sendQQMain(String from, String to, String username, String password, String subject , String text ) {
    
    
		boolean isSSL = true;   // 是否启用SSL
		 // smtp服务器地址（qq）,如果是其他平台，比如163，host为 "smtp.163.com" 
		String host = "smtp.qq.com";  
		int port = 465;    // 邮件服务器端口
		boolean isAuth = true;   //是否需要身份验证
		//创建配置信息
		Properties props = new Properties();  
		props.put("mail.smtp.ssl.enable", isSSL);
		props.put("mail.smtp.host", host);
		props.put(" mail.smtp.port", port);
		props.put("mail.smtp.auth", isAuth);
		
		//验证名称和密码，获取session会话
		Session session = Session.getDefaultInstance(props, new Authenticator() {
    
    
			@Override
			protected PasswordAuthentication getPasswordAuthentication() {
    
    
				return new PasswordAuthentication(username, password);
			}
		});
		try {
    
    
			//创建邮件消息
			Message message = new MimeMessage(session);
			message.setFrom(new InternetAddress(from));
			message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
			message.setSubject(subject);
			message.setText(text);
			Transport.send(message);
		
		} catch (AddressException e) {
    
    
			e.printStackTrace();
		} catch (MessagingException e) {
    
    
			e.printStackTrace();
		}
		System.out.println("发送完毕! ");
		return 0;
	}
}