java发送email

import java.util.Date;
import java.util.Enumeration;
import java.util.Properties;
import java.util.Vector;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;

/**
 * Title: 使用javamail发送邮件
 * Description: 演示如何使用javamail包发送电子邮件。这个实例可群发,可发送多附件
 * Filename: SendMailUtil.java
 */
public class SendMailUtil {
 String to = "";  // 收件人
 String from = "";  // 发件人
 String host = "";  // smtp主机
 String username = ""; // 用户名
 String password = ""; // 密码
 String filename = ""; // 附件文件名
 String subject = ""; // 邮件主题
 String content = ""; // 邮件正文
 Vector