Java封装好的mail包发送电子邮件的类

前端技术 2023/09/08 Java

下面代码是利用Java mail包封装了一个发送邮件的类

import java.io.File;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
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;

public class SendMail {
  private static final String MAIL_ADDRESS_REGEX = \"^[\\\\w\\\\.=-]+@[\\\\w\\\\.-]+\\\\.[\\\\w]{2,3}$\";

  private String mailServer;
  private String sender;
  private String[] receiver;

  public SendMail(){

  }

  public void setMailBasicInfo(String mailServer,String sender,String receiver){
    this.mailServer = mailServer;
    this.sender = sender;
    this.receiver =receiver.split(\",\");
  }

  public void setMailBasicInfo(String mailServer,String sender,String[] users){
    this.mailServer = mailServer;
    this.sender = sender;
    this.receiver = users;
  }

  public void setMailBasicInfo(String mailServer,String sender,List<String> users){
    this.mailServer = mailServer;
    this.sender = sender;
    this.receiver = new String[users.size()];
    users.toArray(this.receiver);
  }

  public boolean send(String subject, String content, List<String> fileNames)
  {
    subject = subject==null?\"\":subject;
    content = content==null?\"\":content;
    Properties props = new Properties();
    props.put(\"mail.smtp.host\", mailServer);
    Session session = Session.getInstance(props, null);
    try
    {
      InternetAddress[] receiver = getReceiverList();
      if (receiver.length == 0)
      {
        System.out.println(\"receiver is null\");
        return false;
      }
      MimeMessage msg = new MimeMessage(session);
      msg.setFrom(new InternetAddress(sender));
      msg.setRecipients(Message.RecipientType.TO, receiver);
      msg.setSubject(subject);
      msg.setSentDate(new Date());

      Multipart container = new MimeMultipart();
      MimeBodyPart textBodyPart = new MimeBodyPart();
      textBodyPart.setContent(content.toString(), \"text/html;charset=gbk\");
      container.addBodyPart(textBodyPart);

      doAttachFile(container,fileNames);
      msg.setContent(container);
      System.out.println(\"begin send mail\");
      Transport.send(msg);
      System.out.println(\"send mail success\");
    }
    catch (MessagingException e)
    {
      System.out.println(\"send mail fail\");
      System.out.println(e);
      return false;
    }
    catch(Exception e){
      return false;
    }
    return true;
  }

  public boolean send(String subject, String content){
    return send(subject,content,null);
  }

  public boolean send(String subject){
    return send(subject,null);
  }

  private void doAttachFile(Multipart container, List<String> fileNames) throws MessagingException{
    if(fileNames==null || fileNames.size()==0)
      return;
    for(String filename:fileNames){
      File f = new File(filename);
      if(!f.isFile())
        continue;
      System.out.println(\"the attach file is:\"+filename);
      MimeBodyPart fileBodyPart = new MimeBodyPart();
      FileDataSource fds = new FileDataSource(f);// 要发送的附件地址
      fileBodyPart.setDataHandler(new DataHandler(fds));
      fileBodyPart.setFileName(fds.getName());// 设置附件的名称
      container.addBodyPart(fileBodyPart);
    }
  }

  private InternetAddress[] getReceiverList() throws AddressException
  {
    ArrayList<InternetAddress> toList = new ArrayList<InternetAddress>();
    for (int i = 0; i < receiver.length; ++i)
    {
      if (receiver[i].matches(MAIL_ADDRESS_REGEX))
      {
        toList.add(new InternetAddress(receiver[i]));
      }
    }

    return (InternetAddress[]) toList.toArray(new InternetAddress[toList.size()]);
  }
}

使用举例

String host = \"168.xx.xx.xx\"; //邮件服务器的地址
String subject = \"发送邮件的主题\";
String sender = \"test@gmail.com\";
List<String> receivers = new ArrayList<String>();
receivers.add(\"user1@263.com\");
receivers.add(\"user2@263.com\");
String content = \"邮件主题\";
SendMail sendMail = new SendMail();
sendMail.setMailBasicInfo(host, sender, receivers);
sendMail.send(subject, content, null); //没有附件

正文也可以是html内容，如

String content = \"<html>详细信息：<a href=\'xxxx\'>请点击查看！</a></html>\";

我们再来看一个封装好的类

package com.message.base.email;
 
import com.message.base.spring.ApplicationHelper;
import com.message.base.utils.StringUtils;
import com.message.base.utils.ValidateUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Properties;
 
/**
 * 发送邮件服务器.
 *
 * @author sunhao(sunhao.java@gmail.com)
 * @version V1.0, 13-3-25 上午6:19
 */
public class EmailServer {
  private static final Logger logger = LoggerFactory.getLogger(EmailServer.class);
  //spring中配置
  /**邮箱服务器配置**/
  private List<EmailConfig> config;
  /**是否开启debug调试模式**/
  private boolean isDebug = false;
  /**是否启用身份验证**/
  private boolean isAuth = true;
  /**验证类型**/
  private String authType = \"auth\";
 
  /**
   * 私有化默认构造器,使外部不可实例化
   */
  private EmailServer(){}
 
  /**
   * 单例,保证上下文中只有一个EmailServer
   *
   * @return EmailServer
   */
  public static EmailServer getInstance(){
    return ApplicationHelper.getInstance().getBean(EmailServer.class);
  }
 
  /**
   * 发送普通邮件(单个接收人)
   *
   * @param username   发件人用户名
   * @param password   发件人密码
   * @param title     邮件标题
   * @param content    邮件正文
   * @param receiver   单个接收人
   * @return
   */
  public boolean sendTextMail(String username, String password, String title, String content, String receiver){
    return this.sendTextMail(username, password, title, content, Collections.singletonList(receiver));
  }
 
  /**
   * 发送普通邮件(多个接收人)
   *
   * @param username   发件人用户名
   * @param password   发件人密码
   * @param title     邮件标题
   * @param content    邮件正文
   * @param receivers   多个接收人
   * @return
   */
  public boolean sendTextMail(String username, String password, String title, String content, List<String> receivers){
    Authentication auth = null;
    if(this.isAuth()){
      //如果需要身份认证，则创建一个密码验证器
      auth = new Authentication(username, password);
    }
 
    Properties props = new Properties();
    props.setProperty(\"mail.smtp.auth\", this.isAuth() ? \"true\" : \"false\");
    props.setProperty(\"mail.transport.protocol\", \"auth\");
    EmailConfig config = this.getEmailConfig(username);
    props.setProperty(\"mail.smtp.host\", config.getSmtp());
    props.setProperty(\"mail.smtp.port\", config.getPort() + \"\");
 
    // 根据邮件会话属性和密码验证器构造一个发送邮件的session
    Session session = Session.getDefaultInstance(props, auth);
    session.setDebug(this.isDebug);
 
    Message message = this.makeTextMail(session, title, content, username, receivers, false);
    try {
      Transport.send(message);
 
      return true;
    } catch (MessagingException e) {
      logger.error(e.getMessage(), e);
      return false;
    }
  }
 
  /**
   * 发送HTML邮件(单个接收人)
   *
   * @param username   发件人用户名
   * @param password   发件人密码
   * @param title     邮件标题
   * @param content    邮件正文
   * @param receiver   单个接收人
   * @return
   */
  public boolean sendHtmlMail(String username, String password, String title, String content, String receiver){
    return this.sendHtmlMail(username, password, title, content, Collections.singletonList(receiver));
  }
 
  /**
   * 发送HTML邮件(多个接收人)
   *
   * @param username   发件人用户名
   * @param password   发件人密码
   * @param title     邮件标题
   * @param content    邮件正文
   * @param receivers   多个接收人
   * @return
   */
  public boolean sendHtmlMail(String username, String password, String title, String content, List<String> receivers){
    Authentication auth = null;
    if(this.isAuth()){
      //如果需要身份认证，则创建一个密码验证器
      auth = new Authentication(username, password);
    }
 
    Properties props = new Properties();
    props.setProperty(\"mail.smtp.auth\", this.isAuth() ? \"true\" : \"false\");
    props.setProperty(\"mail.transport.protocol\", \"auth\");
    EmailConfig config = this.getEmailConfig(username);
    props.setProperty(\"mail.smtp.host\", config.getSmtp());
    props.setProperty(\"mail.smtp.port\", config.getPort() + \"\");
 
    // 根据邮件会话属性和密码验证器构造一个发送邮件的session
    Session session = Session.getDefaultInstance(props, auth);
    session.setDebug(this.isDebug);
 
    Message message = this.makeTextMail(session, title, content, username, receivers, true);
    try {
      Transport.send(message);
 
      return true;
    } catch (MessagingException e) {
      logger.error(e.getMessage(), e);
      return false;
    }
  }
 
  /**
   * 获取邮件服务器配置
   *
   * @param email     邮箱地址
   * @return
   */
  private EmailConfig getEmailConfig(String email){
    String mailServiceDomainName = this.getMailServiceDomainName(email);
    for(EmailConfig config : this.config) {
      if(config.getName().equals(mailServiceDomainName)){
        return config;
      }
    }
    return null;
  }
 
  /**
   * 创建邮件message
   *
   * @param session    根据配置获得的session
   * @param title     邮件主题
   * @param content    邮件的内容
   * @param from     发件者
   * @param receivers   收件者
   * @param isHtmlMail  是否是html邮件
   */
  private Message makeTextMail(Session session, String title, String content, String from, List<String> receivers, boolean isHtmlMail){
    Message message = new MimeMessage(session);
    try {
      /**标题**/
      logger.info(\"this mail\'s title is {}\", title);
      message.setSubject(title);
      /**内容**/
      logger.info(\"this mail\'s content is {}\", content);
      if(isHtmlMail){
        //是html邮件
        message.setContent(content, \"text/html;charset=utf-8\");
      } else {
        //普通邮件
        message.setText(content);
      }
      /**发件者地址**/
      logger.info(\"this mail\'s sender is {}\", from);
      Address fromAddress = new InternetAddress(from);
      message.setFrom(fromAddress);
      /**接收者地址**/
      Address[] tos = new InternetAddress[receivers.size()];
      for(int i = 0; i < receivers.size(); i++){
        String receiver = receivers.get(i);
        if(ValidateUtils.isEmail(receiver)){
          tos[i] = new InternetAddress(receiver);
        }
      }
      /**发件时间**/
      message.setSentDate(new Date());
 
      message.setRecipients(Message.RecipientType.TO, tos);
    } catch (MessagingException e) {
      logger.error(e.getMessage(), e);
      e.printStackTrace();
    }
 
    return message;
  }
 
  /**
   * 获取邮箱域名
   *
   * @param email   邮箱
   * @return
   */
  private String getMailServiceDomainName(String email){
    if(StringUtils.isEmpty(email)){
      return \"\";
    } else {
      int firstIndex = StringUtils.indexOf(email, \"@\");
      int secondIndex = StringUtils.lastIndexOf(email, \".\");
 
      return StringUtils.substring(email, firstIndex + 1, secondIndex);
    }
  }
 
  public List<EmailConfig> getConfig() {
    return config;
  }
 
  public void setConfig(List<EmailConfig> config) {
    this.config = config;
  }
 
  public boolean isDebug() {
    return isDebug;
  }
 
  public void setDebug(boolean debug) {
    isDebug = debug;
  }
 
  public boolean isAuth() {
    return isAuth;
  }
 
  public void setAuth(boolean auth) {
    isAuth = auth;
  }
 
  public String getAuthType() {
    return authType;
  }
 
  public void setAuthType(String authType) {
    this.authType = authType;
  }
}

调用方式如下

public boolean sendMail() throws Exception {
  List<String> receivers = new ArrayList<String>();
  receivers.add(\"sunhao0550@163.com\");
  receivers.add(\"sunhao0550@sina.cn\");
  EmailServer.getInstance().sendHtmlMail(\"message_admin@163.com\", \"这里是密码\", \"测试发送HTML邮件\",
      \"<span style=\'color: red;font-size: 20pt\'>测试发送HTML邮件</span><a href=\'http://www.baidu.com\' target=\'_blank\'>链接到百度</a>\", receivers);
  return EmailServer.getInstance().sendTextMail(\"message_admin@163.com\", \"这里是密码\", \"测试发送文本邮件\",
      \"测试发送文本邮件测试发送文本邮件测试发送文本邮件\", receivers);
}

PS:正在考虑扩展,如果把这几个类封在jar包中,如何进行邮件服务器配置的扩展.

如有不好之处,欢迎拍砖.

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