JAVA邮件开发包括两大方面：

发送与接收邮件：

创建与解析邮件内容：

邮件服务器按通讯协议可以分为两种类型：

SMTP服务器

POP3/IMAP服务器

 

发送邮件用的是SMTP服务器,接收邮件是通过POP3服务器

发送邮件的最简单的代码：

package com.szy.mail;import java.util.Properties;import javax.mail.Address;import javax.mail.Message;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;public class Demo1 {	/**	 * @param args	 */	public static void main(String[] args) throws Exception{		// TODO Auto-generated method stub		Properties props = new Properties();		props.setProperty("mail.smtp.auth", "true");		props.setProperty("mail.transport.protocol", "smtp");		Session session = Session.getInstance(props);		session.setDebug(true);					Message msg = new MimeMessage(session);			//msg.setContent("你好啊");			msg.setFrom(new InternetAddress("295508987@qq.com"));						Transport  transport = session.getTransport();			transport.connect("smtp.sina.com",25,"sun29550","woheni1314");			//transport.send(msg,new Address[]{new InternetAddress("sunzhiyan_syspro@163.com")});			transport.sendMessage(msg,new Address[]{new InternetAddress("295508987@qq.com")});			transport.close();	}}