以一个web项目为例，代码是可以移植的

首先要导入mail.jar包，然后创建自己的类

1：HTMLSender类

复制代码 代码如下:
package com.txq.mail;

import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.NoSuchProviderException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;

/**
*
* @author Administrator
*
*/
public class HTMLSender {
private MimeMessage message;
private Properties props;
private Session session;
private String name = "";
private String password = "";

public HTMLSender(String host,String name,String password)
{
this.name = name;
this.password = password;
props = System.getProperties();

props.put("mail.smtp.host", host);
props.put("mail.smtp.auth","true");
MyAuthenticator auth = new MyAuthenticator(name,password);
session = Session.getDefaultInstance(props,auth);

message = new MimeMessage(session);
new MimeMultipart();
}

public void setFrom(String from)
{
try
{
message.setFrom(new InternetAddress(from));
}
catch (AddressException e)
{
e.printStackTrace();
}
catch (MessagingException e)
{
e.printStackTrace();
}
}

public void setTo(String to)
{
try
{
message.setRecipients(Message.RecipientType.TO,InternetAddress.parse(to));
}
catch(AddressException e)
{
e.printStackTrace();
}
catch(MessagingException e)
{
e.printStackTrace();
}
}

public void setSubject(String subject)
{
try
{
message.setSubject(subject);
}
catch(Exception e)
{
e.printStackTrace();
}
}

public void setContect(String content)
{
try
{
message.setContent(content,"text/html;charset=utf-8");
}
catch(Exception e)
{
e.printStackTrace();
}
}

public boolean send()
{
try
{
Transport transport = session.getTransport("smtp");
transport.connect((String)props.get("mail.smtp.host"),name,password);
transport.sendMessage(message, message.getRecipients(Message.RecipientType.TO));
transport.close();
return true;
}
catch(NoSuchProviderException e)
{
e.printStackTrace();
return false;
}
catch(MessagingException e)
{
e.printStackTrace();
return false;
}
}
}

2：MyAuthenticator类

复制代码 代码如下:
package com.txq.mail;

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


public class MyAuthenticator extends Authenticator{
String name;
String password;
public MyAuthenticator(String name,String pasword)
{
this.name = name;
this.password = pasword;
getPasswordAuthentication();
}
protected PasswordAuthentication getPasswordAuthentication()
{
return new PasswordAuthentication(name,password);
}
}

3：MailAction类

复制代码 代码如下:
package com.txq.action;

import java.io.PrintWriter;

import com.opensymphony.xwork2.ActionSupport;
import com.txq.mail.HTMLSender;

public class MailAction extends ActionSupport {
private String email;
public String sendEmail(){
//代理主机-新浪
String host = "smtp.sina.cn";
//帐号-新浪帐号
String name = "followmusic";
//密码-新浪密码
String password = "followmusic";
//创建发送邮件对象
HTMLSender mail = new HTMLSender(host,name,password);
//发邮帐号
mail.setFrom("followmusic@sina.cn");
//收邮帐号
mail.setTo("youxiangzhanghe@qq.com");
//邮件主题
mail.setSubject("淘兴趣");
//邮件内容
mail.setContect("你的好友邀请你来淘兴趣~");

if(mail.send())
{
return SUCCESS;
}
else
{
return "error";
}
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}