Java实现发送邮件

Java实现发送邮件

摘要：在做Java开发、安卓开发、web开发时，经常遇到邮箱绑定、邮箱找回密码等功能，在使用绑定邮箱并依靠邮箱发送验证码时，需要利用Java实现发送邮件的功能。本人自主开发的诸多项目中也均有发送邮件功能，现整理为开源代码（以QQ邮箱为例）：

（1）需要的jar包为 mail.jar

（2）需要在邮箱进行设置如图：以QQ邮箱为例，进入个人邮箱界面，点击设置；

点击账户，并向下找到“POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV服务”

按下图设置开启项，并获取秘钥，将秘钥拷贝至自己的项目中（见下面的程序）

（3）创建类SendEmail，并编写如下程序。

package com.estudy.email;
import java.util.Date;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SendEmail {
    public static final String HOST = "smtp.exmail.qq.com";
    public static final String PROTOCOL = "smtp";  
    public static final int PORT = 587;
    public static final String FROM = "***@qq.com";//发件人的email
    public static final String PWD = "*****";//发件人密码
    public static final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory"; 
 
    /**
     * 获取Session
     * @return
     */
   public static Session getSession() {
      Properties props = new Properties();
      props.setProperty("mail.smtp.host", "smtp.qq.com");
      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");
 
        Authenticator authenticator = new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(FROM, PWD);
            }
        };
        //Session session = Session.getDefaultInstance(props , authenticator);
        Session session = Session.getInstance(props, authenticator); 
        return session;
    }
 
      //向toEmail发送邮件
    public void send(String toEmail , String content) {
        Session session = getSession();
        try {
            System.out.println("--send--"+content);
            // Instantiate a message
            Message msg = new MimeMessage(session);
 
            //Set message attributes
            msg.setFrom(new InternetAddress(FROM));
            InternetAddress[] address = {new InternetAddress(toEmail)};
            msg.setRecipients(Message.RecipientType.TO, address);
            msg.setSubject("这是邮件的标题");
            msg.setSentDate(new Date());
            msg.setContent(content, "text/html;charset=utf-8");//content作为参数，这是邮件的内容
            Transport.send(msg);
        }
        catch (MessagingException mex) {
            mex.printStackTrace();
        }
    }
    
    //向toEmails群发邮件
    public void send(String[] toEmails , String content) {
        Session session = getSession();
        try {
            System.out.println("--send--"+content);
            // Instantiate a message
            Message msg = new MimeMessage(session);
 
            //Set message attributes
            msg.setFrom(new InternetAddress(FROM));
            InternetAddress[] address = new InternetAddress[toEmails.length];
            for(int i=0;i<toEmails.length;i++){//将群发的所有邮箱地址构建群发队列数组
               address[i] = new InternetAddress(toEmails[i]);
            }
            msg.setRecipients(Message.RecipientType.TO, address);
            msg.setSubject("这里是邮件的标题");
            msg.setSentDate(new Date());
            msg.setContent(content , "text/html;charset=utf-8");
 
            //Send the message
            Transport.send(msg);
        }
        catch (MessagingException mex) {
            mex.printStackTrace();
        }
    }
    public static void main(String []args){
      SendEmail sendEmail = new SendEmail();
      sendEmail.send("***@qq.com", "测试邮件");
   }
}

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