JavaMail一个完整的例子

import java.util.Date;
import java.util.Properties;
import javax.mail.Address;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

/** *//**
* 发送普通邮件，接受普通邮件 发送带有附件的邮件，接收带有附件的邮件 发送html形式的邮件，接受html形式的邮件 发送带有图片的邮件等做了一个总结。
*/
public class JavaMail
{
    // 邮箱服务器
    private String host = "smtp.163.com";
    // 这个是你的邮箱用户名
    private String username = "[e-mail]";
    // 你的邮箱密码
    private String password = "******";
   
    private String mail_head_name = "this is head of this mail";

    private String mail_head_value = "this is head of this mail";

    private String mail_to = "[e-mail]";

    private String mail_from = "[e-mail]";

    private String mail_subject = "this is the subject of this test mail";

    private String mail_body = "this is the mail_body of this test mail";

    private String personalName = "我的邮件";

    public JavaMail()
    {
    }

    /** *//**
     * 此段代码用来发送普通电子邮件
     */
    public void send() throws Exception
    {
        try
        {
            Properties props = new Properties(); // 获取系统环境
            Authenticator auth = new Email_Autherticator(); // 进行邮件服务器用户认证
            props.put("mail.smtp.host", host);
            props.put("mail.smtp.auth", "true");
            Session session = Session.getDefaultInstance(props, auth);
            // 设置session,和邮件服务器进行通讯。
            MimeMessage message = new MimeMessage(session);
            // message.setContent("foobar, "application/x-foobar"); // 设置邮件格式
            message.setSubject(mail_subject); // 设置邮件主题
            message.setText(mail_body); // 设置邮件正文
            message.setHeader(mail_head_name, mail_head_value); // 设置邮件标题
            message.setSentDate(new Date()); // 设置邮件发送日期
            Address address = new InternetAddress(mail_from, personalName);
            message.setFrom(address); // 设置邮件发送者的地址
            Address toAddress = new InternetAddress(mail_to); // 设置邮件接收方的地址
            message.addRecipient(Message.RecipientType.TO, toAddress);
            Transport.send(message); // 发送邮件
            System.out.println("send ok!");
        } catch (Exception ex)
        {
            ex.printStackTrace();
            throw new Exception(ex.getMessage());
        }
    }

    /** *//**
     * 用来进行服务器对用户的认证
     */
    public class Email_Autherticator extends Authenticator
    {
        public Email_Autherticator()
        {
            super();
        }

        public Email_Autherticator(String user, String pwd)
        {
            super();
            username = user;
            password = pwd;
        }

        public PasswordAuthentication getPasswordAuthentication()
        {
            return new PasswordAuthentication(username, password);
        }
    }

    public static void main(String[] args)
    {
        JavaMail sendmail = new JavaMail();
        try
        {
            sendmail.send();
        } catch (Exception ex)
        {
        }
    }

}

1.
mail.jar 下载地址：
http://java.sun.com/products/javamail/downloads/index.html

activation.jar 下载地址：
http://java.sun.com/products/javabeans/jaf/downloads/index.html

2，配置
两个zip解压到c:(这里是举例，你的可能不同)
把javamai的mail.jar和jaf的activation.jar加入到环境变变量中(假设两个文件被copy到了D:\j2sdk1.4.2_09\lib下)
在classpath添加下面两条语句
D:\j2sdk1.4.2_09\lib\mail.jar;
D:\j2sdk1.4.2_09\lib\activation.jar
3.
如果您使用的JDK是J2EE，就没有什么特定的事非要用基本 JavaMail API来做不可；J2EE 的类就能处理了,因为它本身就包含有JavaMail API和JAF,您只需要确将 j2ee.jar 文件添加到您的CLASSPATH 中并已全部设置好。