mail.java

java编写的一个电子邮件客户端的例子

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import java.util.Date;
import javax.activation.*;
import java.io.*;
public class Mail
{
// 21-30行把本程序所用变量进行定义。 具体在main中对它们赋植。
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//MimeMessage对象
public Mail(String smtp)
{
  setSmtpHost(smtp);
  createMimeMessage();
}
/**
  * 
  * 
  * 
  * @param hostName
  *            String
  * 
  * 
  * 
  */
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
}
/**
  * 
  * 
  * 
  * @return boolean
  * 
  * 
  * 
  */
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;
  }
}
/**
  * 
  * 
  * 
  * @param need
  *            boolean
  * 
  * 
  * 
  */
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");
  }
}
/**
  * 
  * 
  * 
  * @param name
  *            String
  * 
  * 
  * 
  * @param pass
  *            String
  * 
  * 
  * 
  */
public void setNamePass(String name, String pass)
{
  System.out.println("程序得到用户名与密码");
  username = name;
  password = pass;
}
/**
  * 
  * 
  * 
  * @param mailSubject
  *            String
  * 
  * 
  * 
  * @return boolean
  * 
  * 
  * 
  */
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;
  }
}
/**
  * 
  * 
  * 
  * @param mailBody
  *            String
  * 
  * 
  * 
  */
public boolean setBody(String mailBody)
{
  try
  {
   System.out.println("设置邮件体格式");
   BodyPart bp = new MimeBodyPart();
   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;
  }
}
/**
  * 
  * 
  * 
  * @param name
  *            String
  * 
  * 
  * 
  * @param pass
  *            String
  * 
  * 
  * 
  */
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;
  }
}
/**
  * 
  * 
  * 
  * @param name
  *            String
  * 
  * 
  * 
  * @param pass
  *            String
  * 
  * 
  * 
  */
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;
  }
}
/**
  * 
  * 
  * 
  * @param name
  *            String
  * 
  * 
  * 
  * @param pass
  *            String
  * 
  * 
  * 
  */
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;
  }
}
/**
  * 
  * 
  * 
  * @param name
  *            String
  * 
  * 
  * 
  * @param pass
  *            String
  * 
  * 
  * 
  */
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;
  }
}
/**
  * 
  * 
  * 
  * @param name
  *            String
  * 
  * 
  * 
  * @param pass
  *            String
  * 
  * 
  * 
  */
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;
  }
}
/**
  * 
  * 
  * 
  * Just do it as this
  * 
  * 
  * 
  */
public static void main(String[] args)
{
  String mailbody = "http://www.laabc.com 用户邮件注册测试 <font color=red>欢迎光临</font> <a href=\"http://www.laabc.com\">啦ABC</a>";
  Mail themail = new Mail("smtp.126.com");
  themail.setNeedAuth(true);
  if (themail.setSubject("laabc.com邮件测试") == false)
   return;
  //邮件内容 支持html 如 <font color=red>欢迎光临</font> <a href=\"http://www.laabc.com\">啦ABC</a>
  if (themail.setBody(mailbody) == false)
   return;
  //收件人邮箱
  if (themail.setTo("[e-mail]") == false)
   return;
  //发件人邮箱
  if (themail.setFrom("[e-mail]") == false)
   return;
  //设置附件
  //if (themail.addFileAffix("#######") == 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
  if (themail.sendout() == false)
   return;
}
}