用java编写程序，发邮件

如何用java编写邮件程序，来发送给某个用户？
没有遇到过这种情况？有知道这方面内容的吗？

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sf ..然后做答，

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Java code:
import java.util.Date;
import java.util.Properties;
import javax.servlet.*; //此句报错误的话请注释
import javax.mail.Session;
import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
import javax.mail.Message;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.InternetAddress;
import javax.mail.Transport;
public class javaMail {
private Properties properties;
private Session mailSession;
private MimeMessage mailMessage;
private Transport trans;
public javaMail() {
}
public void sendMail() {
try {
properties = new Properties();
//设置邮件服务器
properties.put("mail.smtp.host", "smtp.sina.com");
//验证
properties.put("mail.smtp.auth", "true");
//根据属性新建一个邮件会话
mailSession = Session.getInstance(properties,
new Authenticator() {
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("xnjnmn@sina.com",