Java使用javax.mail.jar发送邮件并同意发送附件

因为Java在开发网页上占有绝大优势。所以作为web端的领军人物，譬如发送短信和发送邮件这些就成了必定，网络安全一再安全我们须要把账号的安全级别提到更高。因此这些对于开发者也就成了必须掌握的技能！我一直都认为作为开发者，不怕在开发的过程中遇到多少难题，而是有没有去解决它的勇气和决心，这里多学习就成为了关键，成为了一个程序员发展的重中之重！好啦。闲话就讲到这里。来点实际的。

当一个开发者工作到一定程度后，面向对象的思维就会一直在他的老子里环绕。所以我们先把邮件的常量类、实体类以及工具类等等先该封装的封装，该继承的继承！代码来了。睁大眼睛：

/**
 * @Description: 
 *
 * @Title: SimpleMail.java
 * @Package com.joyce.bean
 * @Copyright: Copyright (c) 2014
 *
 * @author Comsys-LZP
 * @date 2014-5-28 上午09:06:51
 * @version V2.0
 */
package com.joyce.mail.bean;

/**
 * @Description:邮件信息类
 * 
 * @ClassName: SimpleMail
 * @Copyright: Copyright (c) 2014
 * 
 * @author Comsys-LZP
 * @date 2014-5-28 上午09:06:51
 * @version V2.0
 */
public class Mail {
	/**
	 * 主题
	 */
	private String subject;
	/**
	 * 内容
	 */
	private String content;

	/**
	 * @return the subject
	 */
	public String getSubject() {
		return subject;
	}

	/**
	 * @param subject
	 *            the subject to set
	 */
	public void setSubject(String subject) {
		this.subject = subject;
	}

	/**
	 * @return the content
	 */
	public String getContent() {
		return content;
	}

	/**
	 * @param content
	 *            the content to set
	 */
	public void setContent(String content) {
		this.content = content;
	}
}

上面大家看到的就是发送邮件一般不可缺少的邮件标题和邮件内容，作为在邮件使用广泛的那就免不了封装起来了，好啦。接下来咱们看邮箱的登录类：
/**
 * @Description: 
 *
 * @Title: MailAuthenticator.java
 * @Package com.joyce.bean
 * @Copyright: Copyright (c) 2014
 *
 * @author Comsys-LZP
 * @date 2014-5-28 上午08:59:11
 * @version V2.0
 */
package com.joyce.mail.bean;

import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;

/**
 * @Description: 邮箱登录类
 *
 * @ClassName: MailAuthenticator
 * @Copyright: Copyright (c) 2014
 *
 * @author Comsys-LZP
 * @date 2014-5-28 上午08:59:11
 * @version V2.0
 */
public class MailAuthenticator extends Authenticator {
	/**
     * 用户名（登录邮箱）
     */
    private String username;
    
    /**
     * 密码
     */
    private String password;

	/**
	 * @return the username
	 */
	public String getUsername() {
		return username;
	}

	/**
	 * @param username the username to set
	 */
	public void setUsername(String username) {
		this.username = username;
	}

	/**
	 * @return the password
	 */
	public String getPassword() {
		return password;
	}

	/**
	 * @param password the password to set
	 */
	public void setPassword(String password) {
		this.password = password;
	}

	/**
	 * @param username
	 * @param password
	 */
	public MailAuthenticator(String username, String password) {
		this.username = username;
		this.password = password;
	}
	
	@Override
	protected PasswordAuthentication getPasswordAuthentication() {
	    return new PasswordAuthentication(username, password);
    }
}

这时候我们须要的常量类就应该进来了
package com.joyce.mail.bean;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @Description: 邮件发送常量类
 *
 * @ClassName: MailConstant
 * @Copyright: Copyright (c) 2014
 *
 * @author Comsys-LZP
 * @date 2014-5-28 上午11:01:16
 * @version V2.0
 */
public class MailConstant {
	public static final String MAIL_USER = "luo201227@163.com"; 
	public static final String MAIL_PWD = "*****";
	public static final boolean MAIL_IFDEBUG = true;
	public static final String MAIL_CONTENT_CHARSET = "text/html;charset=utf-8"; 
	public static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 HH时mm分ss秒 E");
	public static final String MAIL_TITLE = "*********账号激活码" + sdf.format(new Date());//邮件标题
	public static String getMailContent(String content){
		StringBuffer sb = new StringBuffer();
		sb.append("<div style='1024px;height:auto;margin:0px auto;background-color:#66CCFF;font-size:14px;font-family:微软雅黑;border-radius:5px;padding:5px;'><center><h1>");
		sb.append("</h1></center><div style='margin-left:20px;margin-bottom:10px;'><b>尊敬的用户。您好！
</b><br/><br/>");
		sb.append("    <b></b>"+content);		
		sb.append("</div></div>");
		return sb.toString();
	}
}

关键来了，看看发送邮件的关键部分吧
/**
 * @Description: 
 *
 * @Title: MailSender.java
 * @Package com.joyce.service.impl
 * @Copyright: Copyright (c) 2014
 *
 * @author Comsys-LZP
 * @date 2014-5-28 上午09:03:08
 * @version V2.0
 */
package com.hupu.nac.mail.sender;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Properties;
import java.util.Vector;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

import com.hupu.nac.mail.bean.Mail;
import com.hupu.nac.mail.bean.MailAuthenticator;
import com.hupu.nac.mail.bean.MailConstant;

/**
 * @Description:邮件发送类
 * 
 * @ClassName: MailSender
 * @Copyright: Copyright (c) 2014
 * 
 * @author Comsys-LZP
 * @date 2014-5-28 上午09:03:08
 * @version V2.0
 */
public class MailSender {
	/**
	 * 发送邮件的props文件
	 */
	private final transient Properties props = new Properties();
	/**
	 * 邮件server登录验证
	 */
	private transient MailAuthenticator authenticator;

	/**
	 * 邮箱session
	 */
	private transient Session session;

	/**
	 * 初始化邮件发送器
	 * 
	 * @param smtpHostName
	 *            SMTP邮件server地址
	 * @param username
	 *            发送邮件的用户名(地址)
	 * @param password
	 *            发送邮件的密码
	 */
	public MailSender(final String smtpHostName, final String username,
			final String password) {
		init(username, password, smtpHostName);
	}

	/**
	 * 初始化邮件发送器
	 * 
	 * @param username
	 *            发送邮件的用户名(地址)，并以此解析SMTPserver地址
	 * @param password
	 *            发送邮件的密码
	 */
	public MailSender(final String username, final String password) {
		// 通过邮箱地址解析出smtpserver。对大多数邮箱都管用
		final String smtpHostName = "smtp." + username.split("@")[1];
		init(username, password, smtpHostName);

	}

	/**
	 * @Description: 初始化
	 * 
	 * @param username
	 *            发送邮件的用户名(地址)
	 * @param password
	 *            密码
	 * @param smtpHostName
	 *            SMTP主机地址
	 * 
	 * @Title: MailSender.java
	 * @Copyright: Copyright (c) 2014
	 * 
	 * @author Comsys-LZP
	 * @date 2014-5-28 上午09:18:31
	 * @version V2.0
	 */
	private void init(String username, String password, String smtpHostName) {
		// 初始化props
		props.put("mail.smtp.host", smtpHostName);
		props.put("mail.smtp.auth", "true");
		// 验证
		authenticator = new MailAuthenticator(username, password);
		// 创建session
		session = Session.getInstance(props, authenticator);
		// 打印一些调试信息
		session.setDebug(MailConstant.MAIL_IFDEBUG);
	}

	/**
	 * @Description: 发送邮件
	 * 
	 * @param recipient
	 *            收件人邮箱地址
	 * @param subject
	 *            邮件主题
	 * @param content
	 *            邮件内容
	 * @throws AddressException
	 * @throws MessagingException
	 * 
	 * @Title: MailSender.java
	 * @Copyright: Copyright (c) 2014
	 * 
	 * @author Comsys-LZP
	 * @date 2014-5-28 上午09:19:16
	 * @version V2.0
	 */
	public void send(String recipient, String subject, Object content) throws Exception {
		send(recipient, subject, content, null);
	}

	/**
	 * 发送邮件
	 * 
	 * @param recipient
	 *            收件人邮箱地址
	 * @param subject
	 *            邮件主题
	 * @param content
	 *            邮件内容
	 * @param files
	 *            附件
	 * @throws Exception
	 * @author Joyce.Luo
	 * @date 2014-10-15 上午10:23:09
	 * @version V3.0
	 * @since Tomcat6.0,Jdk1.6
	 * @copyright: Copyright (c) 2014
	 */
	public void send(String recipient, String subject, Object content, Vector<File> files) throws Exception {
		// 创建mime类型邮件
		final MimeMessage message = new MimeMessage(session);
		// 设置发信人
		message.setFrom(new InternetAddress(authenticator.getUsername()));
		// 设置收件人
		message.setRecipient(Message.RecipientType.TO, new InternetAddress(
				recipient));
		// 设置主题
		message.setSubject(subject);
		// 设置邮件内容
		if (null == files || files.size() == 0) {
			message.setContent(content.toString(), MailConstant.MAIL_CONTENT_CHARSET);
		} else {
			//创建 Mimemultipart加入内容(可包括多个附件)
			MimeMultipart multipart = new MimeMultipart();
			//MimeBodyPart(用于信件内容/附件)
			BodyPart bodyPart = new MimeBodyPart();
			bodyPart.setContent(content.toString(), MailConstant.MAIL_CONTENT_CHARSET);
			//加入到MimeMultipart对象中
			multipart.addBodyPart(bodyPart);
			for (int i = 0; i < files.size(); i++) {
				File file = (File) files.elementAt(i);
				String fname = file.getName();
				//创建FileDAtaSource(用于加入附件)
				FileDataSource fds = new FileDataSource(file);
				BodyPart fileBodyPart = new MimeBodyPart();
				// 字符流形式装入文件
				fileBodyPart.setDataHandler(new DataHandler(fds));
				// 设置附件文件名称
				fileBodyPart.setFileName(fname);
				multipart.addBodyPart(fileBodyPart);
				message.setContent(multipart);
			}
		}
		// 设置发信时间
		message.setSentDate(new Date());
		// 存储邮件信息
		message.saveChanges();
//		message.setFileName(filename)
		// 发送邮件
		Transport.send(message);
	}

	/**
	 * @Description: 群发邮件
	 * 
	 * @param recipients
	 *            收件人们
	 * @param subject
	 *            主题
	 * @param content
	 *            内容
	 * @throws AddressException
	 * @throws MessagingException
	 * 
	 * @Title: MailSender.java
	 * @Copyright: Copyright (c) 2014
	 * 
	 * @author Comsys-LZP
	 * @date 2014-5-28 上午09:20:24
	 * @version V2.0
	 */
	public void send(List<String> recipients, String subject, Object content) throws Exception {
		send(recipients, subject, content, null);
	}

	/**
	 * 群发邮件
	 * 
	 * @param recipients
	 *            收件人们
	 * @param subject
	 *            主题
	 * @param content
	 *            内容
	 * @param files
	 *            附件
	 * @throws Exception
	 * @author Joyce.Luo
	 * @date 2014-10-15 上午10:26:35
	 * @version V3.0
	 * @since Tomcat6.0,Jdk1.6
	 * @copyright: Copyright (c) 2014
	 */
	public void send(List<String> recipients, String subject, Object content, Vector<File> files) throws Exception {
		// 创建mime类型邮件
		final MimeMessage message = new MimeMessage(session);
		// 设置发信人
		message.setFrom(new InternetAddress(authenticator.getUsername()));
		// 设置收件人们
		final int num = recipients.size();
		InternetAddress[] addresses = new InternetAddress[num];
		for (int i = 0; i < num; i++) {
			addresses[i] = new InternetAddress(recipients.get(i));
		}
		message.setRecipients(Message.RecipientType.TO, addresses);
		// 设置主题
		message.setSubject(subject);
		// 设置邮件内容
		if (null == files || files.size() == 0) {
			message.setContent(content.toString(), MailConstant.MAIL_CONTENT_CHARSET);
		} else {
			 //创建 Mimemultipart加入内容(可包括多个附件)
			MimeMultipart multipart = new MimeMultipart();
			  //MimeBodyPart(用于信件内容/附件)
			BodyPart bodyPart = new MimeBodyPart();
			bodyPart.setContent(content.toString(), MailConstant.MAIL_CONTENT_CHARSET);
			 //加入到MimeMultipart对象中
			multipart.addBodyPart(bodyPart);
			for (int i = 0; i < files.size(); i++) {
				File file = (File) files.elementAt(i);
				String fname = file.getName();
				//创建FileDAtaSource(用于加入附件)
				FileDataSource fds = new FileDataSource(file);
				BodyPart fileBodyPart = new MimeBodyPart();
				// 字符流形式装入文件
				fileBodyPart.setDataHandler(new DataHandler(fds));
				// 设置附件文件名称
				fname = new String(fname.getBytes("UTF-8"), "ISO-8859-1");
				fileBodyPart.setFileName(fname);
				multipart.addBodyPart(fileBodyPart);
				message.setContent(multipart);
			}
		}
		// 设置发信时间
		message.setSentDate(new Date());
		// 存储邮件信息
		message.saveChanges();
		// 发送邮件
		Transport.send(message);
	}

	/**
	 * @Description: 发送邮件
	 * 
	 * @param recipient
	 *            收件人邮箱地址
	 * @param mail
	 *            邮件对象
	 * @throws Exception
	 * 
	 * @Title: MailSender.java
	 * @Copyright: Copyright (c) 2014
	 * 
	 * @author Comsys-LZP
	 * @date 2014-5-28 上午09:20:54
	 * @version V2.0
	 */
	public void send(String recipient, Mail mail) throws Exception {
		send(recipient, mail.getSubject(), mail.getContent());
	}

	/**
	 * @Description: 群发邮件
	 * 
	 * @param recipients
	 *            收件人们
	 * @param mail
	 *            邮件对象
	 * @throws Exception
	 * 
	 * @Title: MailSender.java
	 * @Copyright: Copyright (c) 2014
	 * 
	 * @author Comsys-LZP
	 * @date 2014-5-28 上午09:21:19
	 * @version V2.0
	 */
	public void send(List<String> recipients, Mail mail) throws Exception {
		send(recipients, mail.getSubject(), mail.getContent());
	}

	/**
	 * 群发邮件
	 * 
	 * @param recipients
	 *            收件人们
	 * @param mail
	 *            邮件对象
	 * @param files
	 *            附件
	 * @throws Exception
	 * @author Joyce.Luo
	 * @date 2014-10-15 上午10:28:38
	 * @version V3.0
	 * @since Tomcat6.0,Jdk1.6
	 * @copyright: Copyright (c) 2014
	 */
	public void send(List<String> recipients, Mail mail, Vector<File> files) throws Exception {
		send(recipients, mail.getSubject(), mail.getContent(), files);
	}
}


在网页上的激活码或者验证码这类的就不用多说了吧
/**
 * @Description: 
 *
 * @Title: RandomCodeUtil.java
 * @Package com.joyce.mail.util
 * @Copyright: Copyright (c) 2014
 *
 * @author Comsys-LZP
 * @date 2014-5-28 上午11:07:34
 * @version V2.0
 */
package com.joyce.mail.util;


/**
 * @Description: 随机码工具类
 * 
 * @ClassName: RandomCodeUtil
 * @Copyright: Copyright (c) 2014
 * 
 * @author Comsys-LZP
 * @date 2014-5-28 上午11:07:34
 * @version V2.0
 */
public class RandomCodeUtil {
	/**
	 * 随机码集合
	 */
	private static final String[] randCode = { "0", "1", "2", "3", "4", "5", "6",
			"7", "8", "9", "q", "w", "e", "r", "t", "y", "u", "i", "o", "p",
			"a", "s", "d", "f", "g", "h", "j", "k", "l", "z", "x", "c", "v",
			"b", "n", "m" };
	
	/**
	 * @Description: 产生指定长度的随机码
	 *
	 * @param codeLength
	 * @return
	 *
	 * @Title: RandomCodeUtil.java
	 * @Copyright: Copyright (c) 2014
	 *
	 * @author Comsys-LZP
	 * @date 2014-5-28 上午11:11:55
	 * @version V2.0
	 */
	public static String randomCode(Integer codeLength) throws Exception {
		try {
			StringBuffer code = new StringBuffer();
			if(null == codeLength || 0 == codeLength){
				codeLength = 4;
			}
			for (int i = 0; i < codeLength; i++) {
				code.append(randCode[(int)Math.floor(Math.random() * 36)]);
			}
			return code.toString();
		} catch (Exception e) {
			throw new RuntimeException("Random Code Error");
		}
	}
	
	/**
	 * @Description: 生成长度为4的随机码
	 *
	 * @return
	 * @throws Exception
	 *
	 * @Title: RandomCodeUtil.java
	 * @Copyright: Copyright (c) 2014
	 *
	 * @author Comsys-LZP
	 * @date 2014-5-28 下午01:19:33
	 * @version V2.0
	 */
	public static String randomCode() throws Exception{
		return randomCode(null);
	}
}

Ok。利用javax.mail.jar发送邮件就大功告成了！是不是非常easy呢。完整的demo资源;下载地址：http://download.csdn.net/download/luo201227/7446279

有段时间了。来更新一下。事实上也没有什么非常多要说的，仅仅是跟大家提一下。假设有兴趣的，能够去了解一下James邮件server的搭建！

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原文地址：https://www.cnblogs.com/mengfanrong/p/5182674.html