java发送邮件很慢 java发送邮件的简单实现

在pom.xml中配置如下依赖，或手动导包

<!-- https://mvnrepository.com/artifact/com.sun.mail/javax.mail -->
<dependency>
	<groupId>com.sun.mail</groupId>
	<artifactId>javax.mail</artifactId>
	<version>1.6.2</version>
</dependency>

编写MailUtils类，实现sendMail方法

类字段PASSWORD为客户端授权码，需要在邮件网站上进行获取。

package xxx;

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;

public class MailUtils {
    private static final String USER = ""; //发件人称号 即发件人邮件地址
    private static final String PASSWORD = ""; //客户端授权码

    /**
     * 发送邮件
     * @param to 收件人邮箱
     * @param text 邮件正文
     * @param title 标题
     * @return 是否发送成功
     */
    public static boolean sendMail(String to, String text, String title){

        try{
            final Properties props = new Properties();
            props.put("mail.smtp.auth","true");
            props.put("mail.smtp.host","smtp.163.com");
            //发件人账号和密码
            props.put("mail.user",USER);
            props.put("mail.password", PASSWORD);

            //构建授权信息，用于进行SMTP进行身份验证
            Authenticator authenticator = new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    String userName = props.getProperty("mail.user");
                    String password = props.getProperty("mail.password");
                    return new PasswordAuthentication(userName, password);
                }
            };

            //使用环境属性和授权信息,创建邮件会话
            Session mailSession = Session.getInstance(props, authenticator);
            //创建邮件消息
            MimeMessage message = new MimeMessage(mailSession);
            //设置发件人
            String username = props.getProperty("mail.user");
            InternetAddress from = new InternetAddress(username);
            message.setFrom(from);

            //设置收件人
            InternetAddress toAddress = new InternetAddress(to);
            message.setRecipient(Message.RecipientType.TO, toAddress);

            //设置邮件标题
            message.setSubject(title);

            //设置邮件的内容体
            message.setContent(text, "text/html;charset=UTF-8");

            //发送邮件
            Transport.send(message);
            System.out.println("发送邮件成功至：" + to);
            return true;

        } catch (MessagingException e) {
            e.printStackTrace();
        }
        System.err.println("发送邮件失败至：" + to);
        return false;
    }

}