java定时发送邮件

测试时用的是tomcat6.0服务器:服务器一起，就会自动加载web.xml中的内容，进行时间判断，定时发送；

扩展：可以在中间加上对数据库的操作

1.先导入两个jar.包

mail.jar、activation.jar

2.配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>

  <servlet>
    <servlet-name>mailsenderservlet</servlet-name><!--邮件发送程序-->
   
    <servlet-class>com.email.MailSenderServlet</servlet-class>
   
    <init-param>
      <param-name>server</param-name><!--邮件服务器SMTP地址-->
      <param-value>smtp.163.com</param-value>
    </init-param>
   
    <init-param>
      <param-name>port</param-name><!--邮件服务器SMTP端口-->
      <param-value>25</param-value>
    </init-param>
   
    <init-param>
      <param-name>address</param-name><!--邮件地址-->
      <param-value>[e-mail]</param-value>
    </init-param>
   
    <init-param>
      <param-name>username</param-name><!--邮件账号-->
      <param-value>username</param-value>
    </init-param>
   
    <init-param>
      <param-name>password</param-name><!--密码-->
      <param-value>******</param-value>
    </init-param>
   
    <init-param>
      <param-name>validate</param-name><!--SMTP服务器是否要求验证-->
      <param-value>true</param-value>
    </init-param>
   
    <init-param>
      <param-name>time</param-name><!--扫描数据库时间间隔（分钟）-->
      <param-value>1</param-value>
    </init-param>
   
    <load-on-startup>1</load-on-startup>
   
  </servlet>
 
   <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
 
</web-app>

3.定义两个类MailSenderServlet.java、MailSender.java

MailSenderServlet.java要依赖MailSender.java

 

MailSenderServlet.java

package com.email;

import java.io.File;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

public class MailSenderServlet extends HttpServlet {

 private static final long serialVersionUID = 4114629936094514228L;
 
 private MailSender sender;
 private Thread t;

 public void init() throws ServletException {
  
  System.out.println("auto Send Mial***********begin") ;
  
  sender = new MailSender();
  //sender.setRoot(root);
  
  sender.setRoot(new File("D:/work2/auto_send_mail/"));
  
  String server = getInitParameter("server");
  
  String port = getInitParameter("port");
  
  String address = getInitParameter("address");
  
  String username = getInitParameter("username");
  
  String password = getInitParameter("password");
  
  if (server == null || port == null || address == null || username == null || password == null) {
   
   System.out.println("系统文件web.xml错误：邮件发送程序初始化失败！");
   return;
  }
  
  sender.setServer(server);
  
  sender.setPort(port);
  
  sender.setAddress(address);
  
  sender.setUsername(username);
  
  sender.setPassword(password);

  String time = getInitParameter("time");
  
  if (time != null) {
   
   sender.setTime(Integer.parseInt(time));
  }
  
  String validate = getInitParameter("validate");
  
  if (validate != null) {
   
   sender.setValidate(Boolean.valueOf(validate).booleanValue());
  }
  
  System.out.println("auto Send Mial***********parameter :"+"server ="+server+" port ="+port+" address ="+address+" username ="+username+" password ="+password+" time ="+time+" validate ="+validate) ;
  
  t = new Thread(sender);
  
  //启动邮件发送线程
  t.start();
  
 }

 public void destroy() {
  
  sender.stop(); //停止邮件发送线程
  
  try {
   
   t.join(1000);
   
   if (t.isAlive()) {
    
    System.out.println("邮件发送线程未停止。");
   }
   

 

 

 

MailSender.java

 

package com.email;

import java.io.*;
import java.sql.*;
import java.util.*;
import java.util.Date;
import javax.activation.*;
import javax.mail.*;
import javax.mail.Message.*;
import javax.mail.internet.*;

public class MailSender implements Runnable {

 private int time = 5 * 60 * 1000; //扫描数据库时间间隔

 private boolean flag = true; //停止线程标记

 private String server = "127.0.0.1"; //SMTP服务器地址
 
 //add
 private static final String smtp_host = "mailserver";//邮件服务器名:要改
 
 private String port = "25"; //SMTP服务器端口

 private String address; //用于发送EMAIL的发送者地址

 private String username; //发送者的用户名

 private String password; //发送者的密码

 private boolean validate = true; //邮件服务器是否要求验证

 private File root = null; //WEB根目录

 //MailConfigManager manager = MailConfigManager.getInstance();

 public MailSender() {
  
  System.out.println("auto Send Mial***********MailSender") ;
 }

 public File getRoot() {
  return root;
 }

 public void setRoot(File root) {
  this.root = root;
 }

 public void setAddress(String address) {
  this.address = address;
 }

 public void setPassword(String password) {
  this.password = password;
 }

 public void setPort(String port) {
  if (port != null && port.length() > 0) {
   this.port = port;
  }
 }

 public void setServer(String server) {
  this.server = server;
 }

 public void setUsername(String username) {
  this.username = username;
 }

 public void setValidate(boolean validate) {
  this.validate = validate;
 }

 public void setTime(int minute) {
  this.time = minute * 60 * 1000;
 }

 public void run() {
  
  System.out.println("auto Send Mial***********run") ;
  //保存前一次发送邮件的时间
  long lastTime = new Date().getTime();
  System.out.println("auto Send Mial***********lastTime ="+lastTime) ;
  
  System.out.println("auto Send Mial***********k ="+(new Date().getTime() - lastTime)) ;
  
  System.out.println("auto Send Mial***********time ="+time) ;
  
  //服务器停止时退出线程
  while (flag) {
   
   long k = new Date().getTime() - lastTime;
   
   //防止系统修改时间
   if (k < -1000) {
    
    lastTime = new Date().getTime();
    continue;
   }
   
   //超过设定时间间隔开始发送邮件
   if (k > time) {
    
    System.out.println("auto Send Mial***********k > time") ;
    try {
     send(
       "小样", "<html> <FONT color=/"red/">您有新签核，请登录" +

       "<a href=http://localhost:1111/mold/form/login.jsp>" +

       "模具系统</a>查看</FONT><P></P>" +

       "<FONT color=/"#666666/" size=/"2/">来自系统自动发送邮件，请勿回复！</FONT></html>"
     );
    } catch (Exception e) {
     
     e.printStackTrace();
    }
    
    //sendData();
    lastTime = new Date().getTime();
   }
   
   try {
    
    Thread.sleep(100);
    
   } catch (Exception e) {
    
   }
  }
 }

 public void stop() {
  
  flag = false;
 }

 /**
  * 检索数据库，并发送邮件
  */
 private void sendData() {
  
  System.out.println("auto Send Mial***********sendData") ;
  
  //读取数据库数据
  ResultSet rs = null;

  try {
   
   Session session = Session.getInstance(getProperties(),new Authentic());
   
   //服务器停止时退出线程
   while (flag) {
   
    //发送地址（从rs中得到）
    String toAddress = null;
    //邮件主题
    String subject = null;
    //邮件内容
    String content = null;
    //所有附件（绝对路径）
    String file[] = null;

    //发送邮件
    sendMail(session, toAddress, subject, content, file);
   }
  } catch (Exception e) {
   
   e.printStackTrace();
  } finally {
   
   if (rs != null) {
    
    try {
     
     rs.close();
     
    } catch (SQLException e) {
     
    }
   }
  }
 }
 
 /**
  * 发送邮件
  * @param session 会话
  * @param toAddress 目的地址
  * @param subject 邮件主题
  * @param content 邮件内容（HTML）
  * @param files 邮件附件
  * @return 是否发送成功
  */
 private boolean sendMail(Session session, String toAddress, String subject,String content, String[] files) {

  toAddress = "收件人地址";

  try {
   
   Message rs = new MimeMessage(session);
   
   Address from = new InternetAddress(address);
   
   //发送地址
   rs.setFrom(from);
   
   //接收地址
   rs.setRecipient(RecipientType.TO, new InternetAddress(toAddress));
   
   //邮件主题
   rs.setSubject(subject);
   
   Multipart mp = new MimeMultipart();
   
   BodyPart html = new MimeBodyPart();
   
   //邮件HTML内容
   html.setContent(content, "text/html; charset=GBK");
   
   mp.addBodyPart(html);
   
   //邮件附件
   if (files != null && files.length > 0) {
    
    for (int i = 0; i < files.length; i++) {
     
     MimeBodyPart mbp = new MimeBodyPart();
     
     FileDataSource fds = new FileDataSource(files[i]);
     
     mbp.setDataHandler(new DataHandler(fds));
     
     mbp.setFileName(MimeUtility.encodeWord(files[i], "GBK",null));
     
     mp.addBodyPart(mbp);
    }
   }
   
   //邮件全部内容
   rs.setContent(mp);
   
   //发送时间
   rs.setSentDate(new Date());
   
   //发送
   Transport.send(rs);
   
   return true;
   
  } catch (Exception e) {
   
   e.printStackTrace();
   
   return false;
   
  }
 }

 /**
  * 邮件会话属性
  * @return 会话属性
  */
 private Properties getProperties() {
  
  Properties rs = new Properties();
  
  rs.put("mail.smtp.host", server);
  
  rs.put("mail.smtp.port", port);
  
  rs.put("mail.smtp.auth", validate ? "true" : "false");
  
  return rs;
  
 }

 //验证密码
 class Authentic extends Authenticator {

  public Authentic() {
   
  }

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

 }

 
 
 public static void send(String subject, String text) throws Exception {
  
  Properties props = new Properties();
  
  props.put("mail.smtp.host", smtp_host);
  
  Session session = Session.getDefaultInstance(props, null);
  
  MimeMessage message = new MimeMessage(session);
  
  try {
   
    message.setFrom(new InternetAddress("Mold_System"));//添加发件人
    
    InternetAddress[] address = { new InternetAddress("address") };//定义收件人地址:要改
    
    message.addRecipients(Message.RecipientType.TO, address);//添加收件人
    
    message.setSubject(subject);//添加主题
    
    message.setText(text);//添加内容
    
    Transport.send(message);//发送信息
    
   } catch (Exception e) {
    
    throw e;
   }
 }
 
 
}

  } catch (Exception e) {
   
  }
 }

}