1、maven中添加如下依赖（不会maven则下载javax.mail的jar包）

<dependency><groupId>javax.mail</groupId><artifactId>mail</artifactId><version>1.4.7</version>
</dependency>

2、前往QQ邮箱启用POP3功能

设置->账户->POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV服务->开启POP3/SMTP服务

然后点生成授权码

3、java代码

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Date;
import java.util.Properties;public class QQMail {private static final String FPAMail="freeprogramming@qq.com";//发件人邮箱private static final String FPAMailPwd="xxxxxxxxxxxxx";//替换为你的授权码private static final String NickName="自由编程协会";//显示的发件人昵称private static Properties props;private static Session mailSession;private static MimeMessage message;//初始化（建立持久化连接）static{Date start=new Date();try {// 创建Properties 类用于记录邮箱的一些属性props = new Properties();// 表示SMTP发送邮件，必须进行身份验证props.put("mail.smtp.auth", "true");//此处填写SMTP服务器props.put("mail.smtp.host", "smtp.qq.com");//端口号，QQ邮箱给出了两个端口，但是另一个我一直使用不了，所以就给出这一个587props.put("mail.smtp.port", "587");// 此处填写你的账号props.put("mail.user",FPAMail );// 此处的密码就是前面说的16位STMP口令props.put("mail.password", FPAMailPwd);// 构建授权信息，用于进行SMTP进行身份验证Authenticator authenticator = new Authenticator() {protected PasswordAuthentication getPasswordAuthentication() {// 用户名、密码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mailSession = Session.getInstance(props, authenticator);// 创建邮件消息message = new MimeMessage(mailSession);// 设置发件人InternetAddress form = new InternetAddress(props.getProperty("mail.user"),NickName,"utf-8");message.setFrom(form);}catch (Exception e){e.printStackTrace();}Date end=new Date();System.out.println("初始化成功，耗时："+((end.getTime()-start.getTime()))+"毫秒");}public static void sendQQMail(String title,String html_content,String receiver){try {// 设置收件人的邮箱message.setRecipient(Message.RecipientType.TO,new InternetAddress(receiver));// 设置邮件标题message.setSubject(title);// 设置邮件的内容体message.setContent(html_content, "text/html;charset=UTF-8");Date start=new Date();// 发送邮件Transport.send(message);Date end=new Date();System.out.println("成功发送,耗时"+((end.getTime()-start.getTime()))+"毫秒");}catch (Exception e){e.printStackTrace();}}//测试代码public static void main(String[] args) {

sendQQMail("邮箱测试","这是一封测试邮件！","xxxx@qq.com");//xxxx@qq.com为你要发送给谁就填谁的邮箱

} }