使用JavaMail发送邮件

使用JavaMail实现发送邮件，包括纯文本邮件，包含图片的文件以及带有附件的邮件。

发送邮件的步骤都是固定的，创建邮件的时候，方法会有所不同。

package com.sudytech.email;

import java.io.FileOutputStream;
import java.util.Properties;

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

public class Email {

	public static void main(String[] args) throws Exception {
		new Email().send();
	}

	public void send() throws Exception{
		Properties prop=new Properties();
		prop.setProperty("mail.host", "smtp.sohu.com");
		prop.setProperty("mail.transport.protocol", "smtp");
		prop.setProperty("mail.smtp.auth", "true");
		
		Session session=Session.getInstance(prop);
		session.setDebug(true);

//		Message message=this.createMessage(session);
//		Message message=this.createMessage1(session);
//		Message message=this.createMessage2(session);
		Message message=this.createMessage3(session);
		
		Transport tr=session.getTransport();
		
		tr.connect("smtp.qq.com","424457896","aaa123aaa");
		
		tr.sendMessage(message,message.getAllRecipients());
		
		tr.close();
	}
	
	/**
	 * 纯文本邮件
	 */
	public MimeMessage createMessage(Session session) throws Exception{
		MimeMessage message=new MimeMessage(session);
		message.setFrom(new InternetAddress("424457896@qq.com"));
		message.setSubject("纯文本邮件");
		message.setRecipient(Message.RecipientType.TO, new InternetAddress("424457896@qq.com"));
		
		message.setContent("我是纯文本","text/html;charset=UTF-8");
		return message;
	}
	
	/**
	 * 带有图片的邮件
	 */
	public MimeMessage createMessage1(Session session) throws Exception{
		MimeMessage message=new MimeMessage(session);
		message.setFrom(new InternetAddress("424457896@qq.com"));
		message.setSubject("带图片的邮件");
		message.setRecipient(Message.RecipientType.TO, new InternetAddress("424457896@qq.com"));
		
		//纯文本
		MimeBodyPart text=new MimeBodyPart();
		text.setContent("这是一封邮件正文带图片<img src='cid:xxx.jpg'>的邮件", "text/html;charset=UTF-8");
		
		//图片
		MimeBodyPart image = new MimeBodyPart();
		DataHandler dh = new DataHandler(new FileDataSource("src\\5.jpg"));
		image.setDataHandler(dh);
		image.setContentID("xxx.jpg");

		//描述数据关系
		MimeMultipart mm = new MimeMultipart();
		mm.addBodyPart(text);
		mm.addBodyPart(image);
		mm.setSubType("related");
		
		message.setContent(mm);
		message.saveChanges();
		
		//将创建好的邮件写入到E盘以文件的形式进行保存
//		message.writeTo(new FileOutputStream("E:\\ImageMail.eml"));
		return message;
	}
	
	/**
	 * 带有附件的邮件
	 */
	public MimeMessage createMessage2(Session session) throws Exception{
		MimeMessage message=new MimeMessage(session);
		message.setFrom(new InternetAddress("424457896@qq.com"));
		message.setSubject("带有附件的邮件");
		message.setRecipient(Message.RecipientType.TO, new InternetAddress("424457896@qq.com"));

		//纯文本
		MimeBodyPart text=new MimeBodyPart();
		text.setContent("这是一封邮件正文带附件的邮件", "text/html;charset=UTF-8");
		//附件
		MimeBodyPart attach = new MimeBodyPart();
		DataHandler dh=new DataHandler(new FileDataSource("src\\5.jpg"));
		attach.setDataHandler(dh);
		attach.setFileName(dh.getName());

		//描述数据关系
		MimeMultipart mm=new MimeMultipart();
		mm.addBodyPart(text);
		mm.addBodyPart(attach);
		mm.setSubType("mixed");
		
		message.setContent(mm);
		message.saveChanges();
		
		return message;
	}

	/**
	 * 带有图片和附件的邮件
	 */
	public MimeMessage createMessage3(Session session) throws Exception{
		MimeMessage message=new MimeMessage(session);
		message.setFrom(new InternetAddress("424457896@qq.com"));
		message.setSubject("纯文本,图片和附件的邮件");
		message.setRecipient(Message.RecipientType.TO, new InternetAddress("424457896@qq.com"));
		
		//纯文本
		MimeBodyPart text=new MimeBodyPart();
		text.setContent("这是一封邮件正文带图片和附件的邮件，图片是<img src='cid:xxx.jpg' />", "text/html;charset=UTF-8");
		
		//图片
		MimeBodyPart image=new MimeBodyPart();
		DataHandler dh=new DataHandler(new FileDataSource("src\\5.jpg"));
		image.setDataHandler(dh);
		image.setContentID("xxx.jpg");
		
		//描述关系，纯文本和图片
		MimeMultipart mm1=new MimeMultipart();
		mm1.addBodyPart(text);
		mm1.addBodyPart(image);
		mm1.setSubType("related");

		//先把mm1放进MimeBodypart的content里面,最后将content与attach1放进MimeMultipart的mm2里面，相当于把mm1和mm2整合到了一起
		MimeBodyPart content=new MimeBodyPart();
		content.setContent(mm1);
		
		//附件1
		MimeBodyPart attach1=new MimeBodyPart();
		DataHandler dh1=new DataHandler(new FileDataSource("src\\5.jpg"));
		attach1.setDataHandler(dh1);
		attach1.setFileName(dh1.getName());
		
		
		MimeMultipart mm2=new MimeMultipart();
		mm2.addBodyPart(attach1);
		mm2.addBodyPart(content);
		mm2.setSubType("mixed");
		
		message.setContent(mm2);
		message.saveChanges();
		
		return message;
	}
}