JavaMail发送邮件、带附件邮件（完整版）

工程目录如下：

1、准备javaMail需要的两个Jar包：mail.jar、activation.jar，然后add to build path

2、QQ邮箱开启SMTP服务，开启后，它会给你一串授权码

完整代码如下所示：

import java.security.GeneralSecurityException;
import java.util.Properties;

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 com.sun.mail.util.MailSSLSocketFactory;

public class HelloMail {

    public static void main(String[] args) throws GeneralSecurityException {

          // 收件人电子邮箱
          String to = "xxxxx@qq.com";

          // 发件人电子邮箱
          String from = "xxxxx@qq.com";

          // 获取系统属性
          Properties properties = new Properties();

          //发送邮件协议
          properties.setProperty("mail.transport.protocol", "SMTP");

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

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

          //开启SSL加密：QQ邮箱需要
          MailSSLSocketFactory sf = new MailSSLSocketFactory();
          sf.setTrustAllHosts(true);
          properties.put("mail.smtp.ssl.enable", "true");
          properties.put("mail.smtp.ssl.socketFactory", sf);

          // 设置邮件服务器是否需要登录认证
          properties.setProperty("mail.smtp.auth", "true");

          // 验证账号及密码，密码需要是第三方授权码
          Authenticator auth = new Authenticator() {
          public PasswordAuthentication getPasswordAuthentication(){
             return new PasswordAuthentication("xxxxx@qq.com", "这里添授权码");
                     }
                 };

          // 获取默认session对象
          Session session = Session.getInstance(properties,auth);

          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: 邮件接收人
             message.addRecipient(Message.RecipientType.TO,
                                      new InternetAddress(to));

             // Set Subject: 头部头字段
             message.setSubject("This is the Subject Line!");

             // 设置消息体
             message.setText("This is actual message");

             // 发送消息
             Transport.send(message);
             System.out.println("Sent message successfully....");
          }catch (MessagingException mex) {
             mex.printStackTrace();
          }

    }

}

运行成功，然后qq邮箱就收到了邮件

带附件发送：

import java.io.File;
import java.security.GeneralSecurityException;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Authenticator;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
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;

import com.sun.mail.util.MailSSLSocketFactory;

/*
 * 带附件的邮件
 */
public class MailAttach {

    public static void main(String[] args) throws GeneralSecurityException {

          // 收件人电子邮箱
          String to = "XXXXXXX";    //也可以的

          // 发件人电子邮箱
          String from = "XXXXXXX@qq.com";

          // 获取系统属性
          Properties properties = new Properties();

          //发送邮件协议
          properties.setProperty("mail.transport.protocol", "SMTP");

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

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

          //开启SSL加密：QQ邮箱需要
          MailSSLSocketFactory sf = new MailSSLSocketFactory();
          sf.setTrustAllHosts(true);
          properties.put("mail.smtp.ssl.enable", "true");
          properties.put("mail.smtp.ssl.socketFactory", sf);

          // 设置邮件服务器是否需要登录认证
          properties.setProperty("mail.smtp.auth", "true");

          // 验证账号及密码，密码需要是第三方授权码
          Authenticator auth = new Authenticator() {
          public PasswordAuthentication getPasswordAuthentication(){
             return new PasswordAuthentication("XXXXXXX@qq.com", "授权码");
                     }
                 };

          // 获取默认session对象
          Session session = Session.getInstance(properties,auth);

          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: 邮件接收人
             message.addRecipient(Message.RecipientType.TO,
                                      new InternetAddress(to));

             // Set Subject: 主题名称
             message.setSubject("This is the Subject Line!");

            // 创建消息部分
             BodyPart messageBodyPart = new MimeBodyPart(); 

             // 消息内容
             messageBodyPart.setText("TEST/TEST"); 

             // 创建多重消息
             Multipart multipart = new MimeMultipart(); 

             // 设置文本消息部分
             multipart.addBodyPart(messageBodyPart); 

             // 附件部分
             messageBodyPart = new MimeBodyPart(); 

             //把文件，添加到附件1中
             //数据源
             DataSource source = new FileDataSource(new File("附件路径，比如：D:/test.zip"));
             //设置第一个附件的数据
             messageBodyPart.setDataHandler(new DataHandler(source));
             //设置附件的文件名
             messageBodyPart.setFileName("file1.zip");
             multipart.addBodyPart(messageBodyPart);
             message.setContent(multipart);

             // 发送消息
             Transport.send(message);
             System.out.println("Sent message successfully....");
          }catch (MessagingException mex) {
             mex.printStackTrace();
          }

    }

}