<dependency><groupId>org.junit.jupiter</groupId><artifactId>junit-jupiter-api</artifactId><version>5.3.1</version><scope>compile</scope></dependency> package ncc.email.email.Utils;/*注册得时候使用步骤：1 设置邮件发送的属性2 设置主机地址3 设置是否打开验证4 创建链接5 创建邮件6 设置发送者7 设置接受者8 设置标题9 设置正文10 发送*/import org.junit.jupiter.api.Test;import javax.mail.*;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import java.util.Properties;import java.util.Random;public class SendMail {public static String smtp_host = "smtp.163.com";//网易public static String username = "18154183997@163.com";//邮箱public static String password = "XXXXXXX";//授权码（登录邮箱-->设置-->邮箱安全设置-->客户端授权密码），这里不是邮箱的密码，切记！public static String from = "18154183997@163.com"; //来源邮箱，使用当前账号public static String activeUrl = "http://localhost:8080/";//激活地址public static void sendMail(String to,String subject,String text) throws Exception {//1 准备发送邮件需要的参数Properties props = new Properties();//设置主机地址 smtp.qq.com smtp.126.com smtp.163.comprops.put("mail.smtp.host", smtp_host);//是否打开验证:只能设置true，必须打开props.put("mail.smtp.auth", true);//添加这句 防止553得自我验证验证props.setProperty("mail.smtp.auth", "true");//2 连接邮件服务器（与服务器建立会话）Session session = Session.getDefaultInstance(props);//3 创建邮件信息MimeMessage message = new MimeMessage(session);//4 设置发送者InternetAddress fromAddress = new InternetAddress(from);message.setFrom(fromAddress);//5 设置接收者InternetAddress toAddress = new InternetAddress(to);// to:直接接收者 cc：抄送 bcc暗送message.setRecipient(MimeMessage.RecipientType.TO, toAddress);//6 设置主题message.setSubject(subject);//7 设置正文message.setText(text);//设置HTML方式发送message.setContent(text,"text/html;charset=utf-8");//8 发送:Transport transport = session.getTransport("smtp");//参数不能少，表示的是发送协议//登录邮箱,此处的密码是授权码transport.connect(username, password);transport.sendMessage(message, message.getAllRecipients());transport.close();}// 随机验证码public static String achieveCode() { //由于数字1 和0 和字母 O,l 有时分不清，所有，没有字母1 、0String[] beforeShuffle= new String[] { "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F","G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a","b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v","w", "x", "y", "z" };StringBuffer sb = new StringBuffer();Random rand=new Random();for (int i = 0; i < 4; i++) {sb.append(beforeShuffle[rand.nextInt(beforeShuffle.length)]); //随机获取4位}return sb.toString();}@Testpublic void test() throws Exception {//验证码发送到对方的邮箱，本地用session存储验证码，以待确认String mesg="尊敬的用户:你好!n xxx.验证码为:" + SendMail.achieveCode()+" (有效期为一分钟)";SendMail.sendMail("1114217951@qq.com","激活测试", mesg);System.out.println("发送邮件成功");}}