java实现发送邮件

需要导入的jar包：mail.jar 

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;   

import java.util.Properties;

import com.sun.mail.util.MailSSLSocketFactory;





    // 收件人电子邮箱
	String to = "27****[email protected]";

    // 发件人电子邮箱
    final String from = "131*****[email protected]";

    // 指定发送邮件的主机为 smtp.qq.com
    final String host = "smtp.163.com";  //邮件服务器 QQ邮箱为 smtp.qq.com

    final String password = "**********";


     // 获取系统属性
        Properties properties = System.getProperties();

        // 设置邮件服务器
        properties.setProperty("mail.smtp.host", host);

        properties.put("mail.smtp.auth", "true");
        MailSSLSocketFactory sf = null;
		try {
			sf = new MailSSLSocketFactory();
		} catch (GeneralSecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
        sf.setTrustAllHosts(true);
        properties.put("mail.smtp.ssl.enable", "true");
        properties.put("mail.smtp.ssl.socketFactory", sf);
        // 获取默认session对象
        Session session = Session.getDefaultInstance(properties,new Authenticator(){
            public PasswordAuthentication getPasswordAuthentication()
            {
                return new PasswordAuthentication(from, password); //发件人邮件用户名、密码
            }
        });

        try{
            // 创建默认的 MimeMessage 对象
            MimeMessage message = new MimeMessage(session);

            // Set From: 头部头字段
            message.setFrom(new InternetAddress(from));

            // Set To: 头部头字段
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

            // Set Subject: 头部头字段
            message.setSubject("标题");

            // 设置消息体
            
            message.setText("邮件内容");

            // 发送消息
            Transport.send(message);
            System.out.println("邮件发送成功！");
        }catch (MessagingException mex) {
            mex.printStackTrace();
        }
	}

注意，第三方发送邮件时，要打开邮箱的授权