本文以163邮箱为例
1、准备(邮箱账号，邮箱必须设置POP3/SMTP/IMAP，设置步骤如下：)
》》步骤:1 开启授权码服务
》》步骤:2 手机获取验证码
》》步骤:3 设置授权码
》》步骤:4 开启服务smtp/pop3/imap
》》步骤:5 开启成功，忘记授权码可重设
2、发送邮件的jar包(以下使用的为maven的pom坐标)
<!--发送邮件-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-email</artifactId>
<version>1.5</version>
</dependency>
3、代码实现
import javax.mail.Message; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Properties; //发送邮件 public class test { //配置信息 private static final String MAIL_TRANSPORT_PROTOCOL ="mail.transport.protocol";//邮件的传输协议 private static final String MAIL_TRANSPORT_PROTOCOL_VALUE ="smtp";//使用smtp协议 private static final String MAIL_HOST ="mail.host";//发送邮件的主机 private static final String MAIL_HOST_VALUE ="smtp.163.com"; //发送邮件的服务器地址 private static final String MAIL_DEBUG ="mail.debug"; //调试模式 private static final String MAIL_SMTP_AUTH ="mail.smtp.auth";//邮件smtp作者确认 private static final String CONFIRM ="true";//确认 private static final String SEND_ENCODING_LAYOUT ="text/html;charset=utf-8";//发送邮件的编码格式 //邮件编辑信息(仅需写上自己的) private static final String MAIL_FROM =xxx@163.com";//邮件发送人 private static final String MAIL_FROM_PASSWORD ="xxxxx";//邮件发送人授权码 private static final String MAIL_SUBJECT_REGISTER ="xxxx【注册链接】";//邮件主题(注册链接) private static final String MAIL_SUBJECT_VERIFY_CODE ="xxxx【邮箱验证码】";//邮件主题(邮箱验证码) private static final String MAIL_ORGANIZATION ="xxxx";//邮件组织 private static final String MAIL_WEBSITE ="https://www.xxxx.com/";//组织主页 private static final String MAIL_ORGANIZATION_LOGO ="https://wwwxxxx.com/xxxx/xxxlogo.jpg";//网站logo private static final String MAIL_ORGANIZATION_QRCODE ="https://www.xxxx.com/xxxx/xxx.jpg";//网站二维码图片 public static void main(String[] args) throws Exception{ sendEmail(MAIL_FROM, "xxxx@qq.com", MAIL_SUBJECT_REGISTER, prettyLayout(MAIL_ORGANIZATION,MAIL_WEBSITE, MAIL_ORGANIZATION_LOGO, prettyRegisterLayout("2小时",MAIL_ORGANIZATION,"https://www.xxxx.com/user/register/8asc824jnd741n2c"), MAIL_ORGANIZATION_QRCODE), MAIL_FROM_PASSWORD); sendEmail(MAIL_FROM, "xxxx@qq.com", MAIL_SUBJECT_VERIFY_CODE, prettyLayout(MAIL_ORGANIZATION,MAIL_WEBSITE, MAIL_ORGANIZATION_LOGO, prettyQrCodeLayout("2分钟","580123"), MAIL_ORGANIZATION_QRCODE), MAIL_FROM_PASSWORD); } /** * 发送邮件 * @param from 发送人(邮箱地址) * @param to 接收人 (邮箱地址) * @param subject 主题 * @param content 内容 * @param password 密码(密码为授权码不是邮箱的登录密码) * @throws Exception */ public static void sendEmail(String from,String to,String subject,String content,String password) throws Exception{ Properties props = new Properties();//key value:配置参数。真正发送邮件时再配置 props.setProperty(MAIL_TRANSPORT_PROTOCOL, MAIL_TRANSPORT_PROTOCOL_VALUE);//指定邮件发送的协议，参数是规范规定的 props.setProperty(MAIL_HOST, MAIL_HOST_VALUE);//指定发件服务器的地址，参数是规范规定的 // props.setProperty(MAIL_DEBUG, "true");//邮件发送的调试模式，参数是规范规定的 props.setProperty(MAIL_SMTP_AUTH, CONFIRM);//请求服务器进行身份认证。参数与具体的JavaMail实现有关 Session session = Session.getInstance(props);//发送邮件时使用的环境配置 session.setDebug(true); MimeMessage message = new MimeMessage(session); //设置邮件的头 message.setFrom(new InternetAddress( from )); //谁发送的 message.setRecipients(Message.RecipientType.TO, to );//发送给谁 message.setSubject( subject ); //设置正文 message.setContent( content ,SEND_ENCODING_LAYOUT); // message.setText("<h1>hello</h1>");//纯文本 message.saveChanges(); //发送邮件 Transport ts = session.getTransport(); ts.connect( from , password ); // 密码为授权码不是邮箱的登录密码 ts.sendMessage(message, message.getAllRecipients());//对象，用实例方法} } /** * 邮件内容头部 * @param websiteName 网站名称 * @param principal 网站主页 * @param principalImage 网站logo图片超链接 * @param logoWidth logo图片宽度 * @param logoHeight logo图片高度 * @return */ private static String mailHead(String websiteName,String principal,String principalImage,String logoWidth,String logoHeight){ return "<div style="margin: 0 auto; text-align: left; " + "padding: 38px 50px; 560px; font-size: 14px; " + "color: #606060; background: #fff; border-radius: " + "2px; font-family:Tahoma,Helvetica,'microsoft " + "yahei','Hiragino Sans GB',Simsun,sans-serif; " + "box-shadow: 0 0 4px rgba(0,0,0,0.2);"> " + " <table style="margin: 0 auto; " + "text-align: left; font-size: 14px; color: #606060; " + "background: #fff; font-family: inherit; " + "font-family:Tahoma,Helvetica,'microsoft " + "yahei','Hiragino Sans GB',Simsun,sans-serif;" width="560" cellspacing="0" cellpadding="0" border="0"> " + " <tbody><tr> " + " <th colspan="2"><a href=""+principal+"" rel="noopener" target="_blank"><img src=""+principalImage+"" width=""+logoWidth+"" height=""+logoHeight+""></a></th> " + " </tr> " + " <tr> " + " <td colspan="2" style="font-size: " + "18px; padding: 30px 0 " + "18px;">尊敬的"+websiteName+"用户：</td> " + " </tr> " + " <tr> " + " <td colspan="2" style="line-height: 1.8;"> " + " " + "<div>欢迎使用"+websiteName+"！</div> "; } /** * 邮件内容脚部 * @param websiteName 网站名称 * @param principal 网站主页 * @param qrCode 二维码图片链接(可不填写/仅支持第一张) * @return */ private static String mailFoot(String websiteName,String principal,String...qrCode){ SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日"); String nowDate =sdf.format(new Date()); return " <tr> " + " <td colspan="2" style="text-align: " + "right; line-height: 1.8; padding-bottom: 18px;"> " + " <div>"+websiteName+"团队</div> " + " <div style="color: " + "#909090;">"+nowDate+"</div> " + " </td> " + " </tr> " + (qrCode!=null&&qrCode.length!=0?setQrCode(websiteName,qrCode[0]):"")+ " <tr> " + " <td colspan="2" style="padding-top: 20px; border-top: 1px solid " + "#e7e7e7; line-height: 1.8; font-size: 12px; color: " + "#909090;"> " + " <div>温馨提示：</div> " + " <div>1. " +websiteName+ "官方网址为：<a href=""+principal+"" rel="noopener" target="_blank">"+principal+"</a>，请注意网址，防止钓鱼。</div> " + " <div>2. " + "本邮件为系统自动发出，请勿回复。</div> " + " </td> " + " </tr> " + " </tbody></table> " + " </div>"; } /** * 输出漂亮格式(带logo,可带二维码) * @param websiteName 网站名称 * @param principal 主页地址 * @param principalImage 主页logo 323 x 48 拉伸宽度为 (超链接形式) * @param business 业务 * @param qrCode 二维码 (超链接形式) * @return */ private static String prettyLayout(String websiteName,String principal,String principalImage,String business,String...qrCode){ return mailHead(websiteName,principal,principalImage,"","")+ business + mailFoot(websiteName,principal,qrCode); } /** * 二维码 样式A * @param websiteName //网站名称 * @param qrCode //二维码图片链接 * @return */ private static String setQrCode(String websiteName,String qrCode){ return " <tr> " + " <td style="padding-bottom: 20px;" width="145"> " + " <img src=""+qrCode+"" width="110" height="112"> " + " </td> " + " <td style="line-height: 2; " + "padding-bottom: 20px;"> " + " <div style="font-size: 18px; " + "color: " + "#03c5ff;">扫描关注"+websiteName+"公众号</div> " + " </td> " + " </tr> " ; } /** * 发送邮箱验证码 * @param validity 有效期/单位自行填写 * @param verifyCode 验证码 * @return */ private static String prettyQrCodeLayout(String validity,String verifyCode){ return "<div>邮箱验证码的有效期为:"+validity+"邮箱验证码如下:</div> " + " </td> " + " </tr> " + " <tr> " + " <td colspan="2" style="font-size: " + "12px; line-height: 20px; padding-top: 14px; " + "padding-bottom: 25px; color: #909090;"> " + " <div>"+verifyCode+"</div> " + " </td> " + " </tr> "; } /** * 发送邮箱注册激活链接 * @param validity 有效期/单位自行填写 * @param websiteName 网站名 * @param verifyLink 注册验证链接 * @return */ private static String prettyRegisterLayout(String validity,String websiteName,String verifyLink){ return "<div>请点击以下的链接验证您的邮箱，验证成功后就可以使用"+websiteName+"提供的服务了。</div> " + " </td> " + " </tr> " + " <tr> " + " <td colspan="2" style="font-size: " + "12px; line-height: 20px; padding-top: 14px; " + "padding-bottom: 25px; color: #909090;"> " + " <div>该链接的有效期为"+validity+"，如链接超过有效期请重新发送邮件<a href=""+verifyLink+"" style="color: #03c5ff; text-decoration: " + "underline;" rel="noopener" target="_blank">"+verifyLink+"</a></div> " + " <div style="padding-top: " + "4px;">(如果不能打开页面，请复制该地址到浏览器打开)</div> " + " </td> " + " </tr> "; } }
随机数：
/** * 方法1 可配置随机数 */ public static final String VERIFY_CODES = "0123456789"; public static String generateVerifyCode(int verifySize){ return generateVerifyCode(verifySize, VERIFY_CODES); } /** * 使用指定源生成验证码 * @param verifySize 验证码长度 * @param sources 验证码字符源 * @return */ public static String generateVerifyCode(int verifySize, String sources){ if(sources == null || sources.length() == 0){ sources = VERIFY_CODES; } int codesLen = sources.length(); Random rand = new Random(System.currentTimeMillis()); StringBuilder verifyCode = new StringBuilder(verifySize); for(int i = 0; i < verifySize; i++){ verifyCode.append(sources.charAt(rand.nextInt(codesLen - 1))); } System.out.println(verifyCode.toString()); return verifyCode.toString(); } /** * 方法二直接生成6位数随机数 * @return */ public static Integer getCode() { Random random = new Random(); int identifyCode = (random.nextInt(999999)); if (identifyCode < 100000) { identifyCode += 100000; } System.out.println(identifyCode); return identifyCode; }