java实现发送邮件

在做聊天室项目的时候，由于需要发送邮箱验证码，所以自己查找了这方面的内容。

首先需要在Maven里面依赖

 <dependency><groupId>com.sun.mail</groupId><artifactId>javax.mail</artifactId><version>1.6.2</version></dependency>

位置大体如下

再点击

发送邮件以QQ邮箱举例

 首先要开通SMTP服务，先进入qq邮箱。

找到设置

找到常规

找到第三方服务开通即可

我这里已经开通

更新一下。

然后就可以定义一个发消息的类，发送消息直接调用里面的方法，

package com.djj.social.tool;import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Date;
import java.util.Properties;
import java.util.Random;public class MailSend {private static MimeMessage message;private static String m;public static void sendEmail(String to) throws MessagingException {final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";// QQ邮箱服务器String smtpHost = "smtp.qq.com";// 邮箱用户名，即QQ账号（自定义）final String username = "xxxxxxxxxxxx";// 邮箱授权码（自定义）final String password = "xxxxxxxxxxx";//开通SMTP会得到一个授权码，代替里面的x即可// 自己的邮箱（自定义）final String from = "xxxxxxxxxx@qq.com";// 要发送的邮箱地址（自定义）String toAddress = to;Transport transport;Properties props = new Properties();props.setProperty("mail.smtp.socketFactory.class", SSL_FACTORY);props.setProperty("mail.smtp.socketFactory.fallback", "false");props.setProperty("mail.smtp.port", "465");props.setProperty("mail.smtp.socketFactory.port", "465");props.setProperty("mail.smtp.auth", "true");props.put("mail.smtp.host", smtpHost);props.put("mail.smtp.username", username);props.put("mail.smtp.password", password);Session session = Session.getDefaultInstance(props, new Authenticator() {protected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication(username, password);}});InternetAddress[] addresses = {new InternetAddress(toAddress)};message = new MimeMessage(session);message.setFrom(new InternetAddress(from));message.setRecipients(Message.RecipientType.TO, addresses);message.setSubject("验证码");// 发送标题（自定义）message.setSentDate(new Date());m=generateVerificationCode(5);//验证码的长度System.out.println(m);message.setText(m);// 发送内容（自定义）transport = session.getTransport("smtp");transport.connect(smtpHost, username, password);transport.send(message);System.out.println("Email has been sent");transport.close();}public static boolean judge(String s){if(m.equals(s)){return true;}else{return false;}}private static String generateVerificationCode(int length) {String charSet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";StringBuilder verificationCode = new StringBuilder();Random random = new Random();for (int i = 0; i < length; i++) {verificationCode.append(charSet.charAt(random.nextInt(charSet.length())));}return verificationCode.toString();}
}

里面的judge方法用于判断输入的验证码是否正确，sendEmail方法用于发送邮件。

使用方式如下：

package com.djj.social.demo;
import com.djj.social.tool.MailSend;import javax.mail.MessagingException;public class test {public static void main(String[] args) throws MessagingException {MailSend.sendEmail("xxxxxxxxxx@qq.com");String yzm="XXXXXXX";//这个为输入的验证码if(MailSend.judge(yzm)==true){System.out.println("验证码正确");}else{System.out.println("验证码错误");}}
}