JavaMail笔记

如何在java中发送邮件？我这里参考的是JavaMail开源项目

依赖jar包：java.mail.jar 点击下载

普通邮件发送

测试用的是163邮箱，测试邮件发多了就报554了被识别为垃圾邮件–!

import com.sun.mail.smtp.SMTPTransport;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.security.GeneralSecurityException;
import java.util.Date;
import java.util.Properties;

public class Mail {

public static void main(String[] args) {
try {
sendEmail("出塞", "秦时明月汉时关，万里长征人未还", "xxx@qq.com");
} catch (GeneralSecurityException e) {
e.printStackTrace();
} catch (MessagingException e) {
e.printStackTrace();
}
}

/**
*
* @param subject 邮件主题
* @param text 邮件内容
* @param to 收件人
* @throws GeneralSecurityException
* @throws MessagingException
*/
private static void sendEmail(String subject, String text, String to) throws GeneralSecurityException, MessagingException {
String mailer   = "Microsoft Outlook Express 6.00.2900.2869"; // 发信客户端
String mailhost = "smtp.163.com"; // smtp服务器
String port     = "25"; // 默认端口为25
String user     = "xxx@163.com"; // 邮箱账号
String password = "xxx"; // 邮箱密码

// 1、邮件会话实例
Properties props = new Properties();        // 属性设置
props.put("mail.smtp.host", mailhost);
props.put("mail.smtp.auth", "true");

Session session = Session.getInstance(props, null);
session.setDebug(true);

// 2、邮件消息内容封装
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(user));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to, false));
msg.setSubject(subject);
msg.setText(text);
msg.setHeader("X-Mailer", mailer);
msg.setSentDate(new Date());

// 3、连接服务器并发送邮件
SMTPTransport t = (SMTPTransport) session.getTransport();
try {
t.connect(user, password);
t.sendMessage(msg, msg.getAllRecipients());
} finally {
t.close();
}

System.out.println("\nMail was sent successfully.");
}
}

SSL加密

测试用了163和sina的邮箱都成功了

import com.sun.mail.smtp.SMTPTransport;
import com.sun.mail.util.MailSSLSocketFactory;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.security.GeneralSecurityException;
import java.util.Date;
import java.util.Properties;

public class Mail {

public static void main(String[] args) {
try {
sendEmail("出塞", "秦时明月汉时关，万里长征人未还", "xxx@qq.com");
} catch (GeneralSecurityException e) {
e.printStackTrace();
} catch (MessagingException e) {
e.printStackTrace();
}
}

private static void sendEmail(String subject, String text, String to) throws GeneralSecurityException, MessagingException {
String mailer   = "Microsoft Outlook Express 6.00.2900.2869"; // 发信客户端
String mailhost = "smtp.sina.com";
String port     = "465";
String user     = "xxx@sina.com"; // 邮箱账号
String password = "xxx"; // 邮箱密码

// 属性设置
Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.host", mailhost);
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.socketFactory.port", port);
props.put("mail.smtp.port", port);
props.put("mail.smtp.ssl.enable", "true"); // 启用SSL
MailSSLSocketFactory sf = new MailSSLSocketFactory();
sf.setTrustAllHosts(true);
props.put("mail.smtp.ssl.socketFactory", sf); // 信任证书

// 1、邮件会话
Session session = Session.getInstance(props, null);
session.setDebug(true);

// 2、邮件内容

dd83
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(user));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to, false));
msg.setSubject(subject);
msg.setText(text);
msg.setHeader("X-Mailer", mailer);
msg.setSentDate(new Date());

// 3、连接服务器
SMTPTransport t = (SMTPTransport) session.getTransport();
try {
t.connect(user, password);
t.sendMessage(msg, msg.getAllRecipients());
} finally {
t.close();
}

System.out.println("\nMail was sent successfully.");
}
}

STARTTLS加密

测试用的是微软outlook邮箱发送成功

import com.sun.mail.smtp.SMTPTransport;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.security.GeneralSecurityException;
import java.util.Date;
import java.util.Properties;

public class Mail {

public static void main(String[] args) {
try {
sendEmail("出塞", "秦时明月汉时关，万里长征人未还", "xxx@outlook.com");
} catch (GeneralSecurityException e) {
e.printStackTrace();
} catch (MessagingException e) {
e.printStackTrace();
}
}

private static void sendEmail(String subject, String text, String to) throws GeneralSecurityException, MessagingException {
String mailer   = "Microsoft Outlook Express 5.50.4807.1700"; // 发信客户端
String user     = "xxx@outlook.com"; // 邮箱账号
String password = "xxx"; // 邮箱密码

// 属性设置
Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", "smtp-mail.outlook.com"); // 微软outlook smtp服务器
props.put("mail.smtp.port", "587");

// 1、邮件会话
Session session = Session.getInstance(props, null);
session.setDebug(true); // 设置打印日志

// 2、邮件内容
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(user));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to, false));
msg.setSubject(subject);
msg.setText(text);
msg.setHeader("X-Mailer", mailer);
msg.setSentDate(new Date());

// 3、连接服务器
SMTPTransport t = (SMTPTransport) session.getTransport();
try {
t.connect(user, password);
t.sendMessage(msg, msg.getAllRecipients());
} finally {
t.close();
}

System.out.println("\nMail was sent successfully.");
}
}

注：有些邮箱可能需要去官网设置smtp状态，因为可能默认没有开启smtp支持；并且smtp服务器的具体地址一般在邮箱官网设置里寻找；

参考

http://www.oracle.com/technetwork/java/javamail/index.html

https://javaee.github.io/javamail/