java实现发送邮件

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import java.util.Date;
import javax.activation.*;
import java.io.*;
public class Mail {
 private MimeMessage mimeMsg; // MIME邮件对象
 private Session session; // 邮件会话对象
 private Properties props; // 系统属性
 private boolean needAuth = false; // smtp是否需要认证
 private String username = ""; // smtp认证用户名和密码
 private String password = "";
 private Multipart mp; // Multipart对象,邮件内容,标题,附件等内容均添加到其中后再生成
 public Mail(String smtp) {
  setSmtpHost(smtp);
  createMimeMessage();
 }
 public void setSmtpHost(String hostName) {
  System.out.println("设置系统属性：mail.smtp.host = " + hostName);
  if (props == null)
   props = System.getProperties(); // 获得系统属性对象
  props.put("mail.smtp.host", hostName); // 设置SMTP主机
 }
 public boolean createMimeMessage() {
  try {
   System.out.println("准备获取邮件会话对象！");
   session = Session.getDefaultInstance(props, null); // 获得邮件会话对象
  } catch (Exception e) {
   System.err.println("获取邮件会话对象时发生错误！" + e);
   return false;
  }
  System.out.println("准备创建MIME邮件对象！");
  try {
   mimeMsg = new MimeMessage(session); // 创建MIME邮件对象
   mp = new MimeMultipart(); // mp 一个multipart对象
   // Multipart is a container that holds multiple body parts.
   return true;
  } catch (Exception e) {
   System.err.println("创建MIME邮件对象失败！" + e);
   return false;
  }
 }
 public void setNeedAuth(boolean need) {
  System.out.println("设置smtp身份认证：mail.smtp.auth = " + need);
  if (props == null)
   props = System.getProperties();
  if (need) {
   props.put("mail.smtp.auth", "true");
  } else {
   props.put("mail.smtp.auth", "false");
  }
 }
 public void setNamePass(String name, String pass) {
  System.out.println("程序得到用户名与密码");
  username = name;
  password = pass;
 }
 public boolean setSubject(String mailSubject) {
  System.out.println("设置邮件主题！");
  try {
   mimeMsg.setSubject(mailSubject);
   return true;
  } catch (Exception e) {
   System.err.println("设置邮件主题发生错误！");
   return false;
  }
 }
 public boolean setBody(String mailBody) {
  try {
   System.out.println("设置邮件体格式");
   BodyPart bp = new MimeBodyPart();
   // 转换成中文格式
   bp.setContent(
     "<meta http-equiv=Content-Type content=text/html; charset=gb2312>"
       + mailBody, "text/html;charset=GB2312");
   mp.addBodyPart(bp);
   return true;
  } catch (Exception e) {
   System.err.println("设置邮件正文时发生错误！" + e);
   return false;
  }
 }
 public boolean addFileAffix(String filename) {
  System.out.println("增加邮件附件：" + filename);
  try {
   BodyPart bp = new MimeBodyPart();
   FileDataSource fileds = new FileDataSource(filename);
   bp.setDataHandler(new DataHandler(fileds));
   bp.setFileName(fileds.getName());
   mp.addBodyPart(bp);
   return true;
  } catch (Exception e) {
   System.err.println("增加邮件附件：" + filename + "发生错误！" + e);
   return false;
  }
 }
 public boolean setFrom(String from) {
  System.out.println("设置发信人！");
  try {
   mimeMsg.setFrom(new InternetAddress(from)); // 设置发信人
   return true;
  } catch (Exception e) {
   return false;
  }
 }
 public boolean setTo(String to) {
  System.out.println("设置收信人");
  if (to == null)
   return false;
  try {
   mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress
     .parse(to));
   return true;
  } catch (Exception e) {
   return false;
  }
 }
 public boolean setCopyTo(String copyto) {
  System.out.println("发送附件到");
  if (copyto == null)
   return false;
  try {
   mimeMsg.setRecipients(Message.RecipientType.CC,
     (Address[]) InternetAddress.parse(copyto));
   return true;
  } catch (Exception e) {
   return false;
  }
 }
 public boolean sendout() {
  try {
   mimeMsg.setContent(mp);
   mimeMsg.saveChanges();
   System.out.println("正在发送邮件....");
   Session mailSession = Session.getInstance(props, null);
   Transport transport = mailSession.getTransport("smtp");
   transport.connect((String) props.get("mail.smtp.host"), username,
     password);
   transport.sendMessage(mimeMsg, mimeMsg
     .getRecipients(Message.RecipientType.TO));
   // transport.send(mimeMsg);
   System.out.println("发送邮件成功！");
   transport.close();
   return true;
  } catch (Exception e) {
   System.err.println("邮件发送失败！" + e);
   return false;
  }
 }
 public static void main(String[] args) {
  String mailbody = "发送邮件测试 <font color=red>欢迎你,java</font>";
  Mail themail = new Mail("smtp.sina.com");
  themail.setNeedAuth(true);
  // 标题
  if (themail.setSubject("发送邮件测试") == false)
   return;
  // 邮件内容 支持html 如 <font color=red>欢迎你,java</font>
  if (themail.setBody(mailbody) == false)
   return;
  // 收件人邮箱
  if (themail.setTo("########@sina.com") == false)
   return;
  // 发件人邮箱
  if (themail.setFrom("########@sina.com") == false)
   return;
  // 设置附件
  if (themail.addFileAffix("mail.txt") == false)
   return; // 附件在本地机子上的绝对路径
  themail.setNamePass("用户名", "密码"); // 用户名与密码,即您选择一个自己的电邮
  if (themail.sendout() == false)
   return;
 }
}