通过命令发送邮件太过繁琐，这里直接写了代码来发送邮件

canJavaMail

JavaMailDemo.java

package cn.hncu;

import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
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.MimeMessage.RecipientType;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;

import org.junit.Test;

public class JavaMailDemo {
	
	@Test//发送一封简单邮件
	public void test1() throws Exception{
		//1.创建一个进行邮件发送会话的session对象
		Properties p=new Properties();
		p.setProperty("mail.host", "smtp.sina.com");// qq: smtp.qq.com
		p.setProperty("mail.smtp.auth", "true");
		p.setProperty("mail.smtp.port", "25");//QQ: 官网上给出发送端口为587/465，但是我这里只有587成功了
		
		Session session=Session.getDefaultInstance(p,new Authenticator() {
			@Override
			protected PasswordAuthentication getPasswordAuthentication() {
				PasswordAuthentication pa=new PasswordAuthentication("hncujava@sina.com", "hncu1234567");//QQ: 用户名为QQ邮箱，密码是QQ给的16位SMTP口令
				return pa;
			}
		});
		
		session.setDebug(true);//设置让程序和邮件服务器进行问答式交互
		
		//2.声明一封邮件-----MimeMessage
		MimeMessage msg=new MimeMessage(session);
		msg.setFrom(new InternetAddress("hncujava@sina.com"));
		msg.setRecipient(RecipientType.TO, new InternetAddress("544863212@qq.com"));
		
		//设置邮件发送的内容
		msg.setSubject("JAVA 发送邮件");
		msg.setContent("Hello  World ...............2016.12.19", "text/html;charset=utf-8");
		
		//3.发送
		Transport.send(msg);
	}
	
	@Test//发送一封带附件的邮件
	public void test2() throws Exception{
		Properties p=new Properties();
		p.setProperty("mail.host", "smtp.qq.com");
		p.setProperty("mail.smtp.auth", "true");
		p.setProperty("mail.smtp.port", "587");
		
		Session session=Session.getDefaultInstance(p, new Authenticator() {
			@Override
			protected PasswordAuthentication getPasswordAuthentication() {
				PasswordAuthentication pwd=new PasswordAuthentication("862482770@qq.com", "ifhqsxukotsvbfje");
				return pwd;
			}
		});
		
		MimeMessage msg=new MimeMessage(session);
		msg.setFrom(new InternetAddress("862482770@qq.com"));
		msg.setRecipient(RecipientType.TO, new InternetAddress("544863212@qq.com"));
		
		msg.setSubject("带附件的邮件");
		
		/////////////////////以下部分和简单邮件不同之处/////////////////////////////
		//body1-------邮件正文 
		MimeBodyPart body1=new MimeBodyPart();
		body1.setContent("Hello  Java Mail 你好！","text/html;charset=utf-8");
		
		//body2-------附件(图片)
		MimeBodyPart body2=new MimeBodyPart();
		body2.setDataHandler(new DataHandler(new FileDataSource("./imgs/4.jpg")));
		body2.setFileName(MimeUtility.decodeText("良辰"));
		
		//body3-------附件(图片)
		MimeBodyPart body3=new MimeBodyPart();
		body3.setDataHandler(new DataHandler(new FileDataSource("./imgs/5.jpg")));
//		body3.setFileName("美景");这种方式会乱码
		body3.setFileName(MimeUtility.encodeText("美景"));
		
		//body4-------附件(图片)
		MimeBodyPart body4=new MimeBodyPart();
		body4.setDataHandler(new DataHandler(new FileDataSource("./imgs/1.txt")));
//		body3.setFileName("美景");这种方式会乱码
		body4.setFileName(MimeUtility.encodeText("文件.txt"));
		
		//把三个body封装成一个MimeMultipart对象，然后设进msg.setContent()中去
		MimeMultipart mm=new MimeMultipart();
		mm.addBodyPart(body1);
		mm.addBodyPart(body2);
		mm.addBodyPart(body3);
		mm.addBodyPart(body4);
		msg.setContent(mm);
		///////////////////////////////////////////////////////////////////////////
		
		Transport.send(msg);
	}
}

简单邮件发送：

带有附件的邮件：附件可以下载

处理中文附件乱码：

MimeBodyPart mb = new MimeBodyPart();

DataHandler dh = new DataHandler(new FileDataSource("./imgs/美女.jpg"));

mb.setDataHandler(dh);

mb.setFileName(MimeUtility.encodeText(dh.getName()));

//设置文件名,同时处理中文名

邮件里面是可以内嵌图片来发送的，由于时间原因我没写，就不贴了。