Maven 依赖
<!-- javaemail --><javaemail.version>1.4.5</javaemail.version><mail.version>1.4.1</mail.version><!-- javamail 发送邮件--><dependency><groupId>javamail</groupId><artifactId>javamail</artifactId><version>${javaemail.version}</version></dependency><dependency><groupId>javax.mail</groupId><artifactId>mail</artifactId><version>${mail.version}</version></dependency>
email.properties
#test emailwithfilemail.smtp.host=smtp.mail.smtp.port=465mail.smtp.protocol=smtpmail.sender.username=你的邮箱登录名mail.sender.password=你的邮箱密码
代码实现
未解决的问题：当发送多个人多邮件时，第一次发送采用SSL加密，但是第二次以后都不是采用SSL加密方式验证；
我只创建了一个session,查看源代码发现,难道是每次发送邮件都会调用下面方法，session在第一次就消耗了？
Session s = (msg.session != null) ? msg.session Session.getDefaultInstance(System.getProperties(), null);
代码改进
查看源代码 如果不需要SSL加密可以采用transport.sendMessage(msg, addresses)，因为Transport.send(message,Address[] address)调用了 transport.sendMessage(msg, addresses);
Session s = (msg.session != null) ? msg.session : Session.getDefaultInstance(System.getProperties(), null);Transport transport;if (dsize == 1) {transport = s.getTransport(addresses[0]);try {transport.connect();transport.sendMessage(msg, addresses);} finally {transport.close();}return;}
2.采用Address[]会比采用InternetAddress[]接收收件人发送多收件人邮件时更快，查看源代码发现
因为InternetAddress是继承与Address，
测试代码：同时向两个收件人发送两个附件信息：
long time1=System.currentTimeMillis();boolean isSend= sendEmail.sendEmail(subject, nickName, sendHtml, receiveUser, filePath);long time2=System.currentTimeMillis();System.err.println("sendEmail spend time:"+(time2-time1));
对比结果采用Address[]：
250 Ok: queued as QUIT221 Byesend success!sendEmail spend time:1520
对比结果采用InternetAddress[]：
250 Ok: queued as QUIT221 Byesend success!sendEmail spend time:1210
3.经过实验发现当采用SSL验证时，邮件端口号为465，当不采用SSL验证时，端口号为25；采用SSL验证：
DEBUG: setDebug: JavaMail version 1.4.5DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]DEBUG SMTP: useEhlo true, useAuth trueDEBUG SMTP: useEhlo true, useAuth trueDEBUG SMTP: trying to connect to host "smtp.", port 465, isSSL true220 Esmtp QQ Mail ServerDEBUG SMTP: connected to host "smtp.", port: 465
不采用SSL验证：
=09DEBUG: setDebug: JavaMail version 1.4.5DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.m=ail.smtp.SMTPTransport,Sun Microsystems, Inc]DEBUG SMTP: useEhlo true, useAuth falseDEBUG SMTP: trying to connect to host "smtp.", port 25, isSSL =false220 Esmtp QQ Mail ServerDEBUG SMTP: connected to host "smtp.", port: 25
附上源代码
package com.meyacom.tool;import java.io.File;import java.io.IOException;import java.io.InputStream;import java.security.GeneralSecurityException;import java.util.ArrayList;import java.util.Date;import java.util.List;import java.util.Properties;import javax.activation.DataHandler;import javax.activation.DataSource;import javax.activation.FileDataSource;import javax.mail.Address;import javax.mail.Authenticator;import javax.mail.BodyPart;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.InternetAddress;import javax.mail.internet.MimeBodyPart;import javax.mail.internet.MimeMessage;import javax.mail.internet.MimeMultipart;import javax.mail.internet.MimeUtility;import mons.lang.StringUtils;import org.apache.log4j.Logger;import com.sun.mail.util.MailSSLSocketFactory;/*** Title: FileEmaliUtil* <p>* Description:发送带附件的邮件(多收件人多附件)* <p>* Copyright: Copyright (c) * <p>* Company:* <p>* * @author zhoulin.zhu* <p>* 8月25日*/public class SendEmaliUtil {protected Logger logger = Logger.getLogger(this.getClass());private MimeMessage message;private String mailHost = "";private String mailPort = "";private String mailProtocol = "";private String sender_username = "";private String sender_password = "";private Properties properties = new Properties();/** 初始化方法*/public SendEmaliUtil(boolean debug) {InputStream in = ClassLoader.getSystemResourceAsStream("email.properties");try {properties.load(in);this.mailHost = properties.getProperty("mail.smtp.host");this.mailPort = properties.getProperty("mail.smtp.port");this.mailProtocol = properties.getProperty("mail.smtp.protocol");this.sender_username = properties.getProperty("mail.sender.username");this.sender_password = properties.getProperty("mail.sender.password");} catch (IOException e) {System.out.println("读取默认参数文件异常，请重试!");}}/*** 用户名密码验证，需要实现抽象类Authenticator的抽象方法PasswordAuthentication，* SMTP验证类(内部类)，继承javax.mail.Authenticator*/class MyAuthenricator extends Authenticator {String username = null;String password = null;public MyAuthenricator(String username, String password) {this.username = username;this.password = password;}@Overrideprotected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication(username, password);}}/*** 指定发送邮件* * @param subject* 邮件主题* @param sendHtml* 邮件内容* @param sender_nickName* 发送邮件人地址* @param receiveUser* 收件人列表，以","分割* @param filePath* 附件列表*/public boolean sendEmail(String subject, String sender_nickName,String sendHtml, String receiveUser, List<String> filePath) {Properties prop = new Properties();// 协议prop.setProperty("mail.transport.protocol", mailProtocol);// 服务器prop.setProperty("mail.smtp.host", mailHost);// 端口prop.setProperty("mail.smtp.port", mailPort);// 使用smtp身份验证prop.setProperty("mail.smtp.auth", "true");// 使用SSL，企业邮箱必需！// 开启安全协议MailSSLSocketFactory sf = null;try {sf = new MailSSLSocketFactory();sf.setTrustAllHosts(true);} catch (GeneralSecurityException e1) {System.out.println("开启SSL加密异常！"); e1.printStackTrace();return false;}prop.put("mail.smtp.ssl.enable", "true");prop.put("mail.smtp.ssl.socketFactory", sf);Session session = Session.getDefaultInstance(prop, new MyAuthenricator(sender_username, sender_password));session.setDebug(true);// 开启DEBUG模式,在控制台中或日志中有日志信息显示，也就是可以从控制台中看一下服务器的响应信息；message = new MimeMessage(session);try {InternetAddress from;if (StringUtils.isNotBlank(sender_nickName)) {// 发件人,昵称from = new InternetAddress(MimeUtility.encodeWord(sender_nickName) + "<"+ sender_username + ">");} else {// 发件人from = new InternetAddress(MimeUtility.encodeWord(sender_nickName));}message.setFrom(from);// 创建收件人列表if (StringUtils.isNotBlank(receiveUser)) {// 替换收件人的分隔符（防止中文下产生无法分割成收件人数组的'，'替换成','）String rescivers = receiveUser.replaceAll("，", ",");String[] arr = rescivers.split(",");if (arr.length > 0) {// 收件人 //采用Address【】比InternetAddress发送邮件速度更快 因为InternetAddress是继承与Address，Address[] address=new Address[arr.length];//InternetAddress[] address = new InternetAddress[arr.length];for (int i = 0; i < arr.length; i++) {address[i] = new InternetAddress(arr[i]);}message.setRecipients(Message.RecipientType.TO, address);// 发送时间message.setSentDate(new Date());// 邮件主题message.setSubject(subject);// 向multipart对象中添加邮件的各个部分内容，包括文本内容和附件Multipart multipart = new MimeMultipart();// 添加邮件正文BodyPart contentPart = new MimeBodyPart();contentPart.setContent(sendHtml, "text/html;charset=UTF-8");multipart.addBodyPart(contentPart);// 附件操作if (filePath != null && filePath.size() > 0) {for (String filename : filePath) {BodyPart attachmentBodyPart = new MimeBodyPart();DataSource source = new FileDataSource(filename);attachmentBodyPart.setDataHandler(new DataHandler(source));// MimeUtility.encodeWord可以避免文件名乱码attachmentBodyPart.setFileName(MimeUtility.encodeWord(source.getName()));multipart.addBodyPart(attachmentBodyPart);} // 移走集合中的所有元素filePath.clear();}// 将multipart对象放到message中message.setContent(multipart);// 保存邮件message.saveChanges();// 不采用ssl加密发送// transport = session.getTransport("smtp");// smtp验证，就是你用来发邮件的邮箱用户名密码// transport.connect(mailHost, sender_username,// sender_password);// 发送// transport.sendMessage(message,// message.getAllRecipients());// 发送 Transport.send(message,address);System.out.println("send success!");}}return true;} catch (Exception e) {System.out.println("message异常！");e.printStackTrace();return false;}}public static void main(String[] args) {String subject = "测试";String nickName = "风中思絮";String sendHtml = "<p class='color:red'>由于下雨，周末不加班！</p>";String receiveUser = "xxx@，XXX@";//String receiveUser = "xxx@";List<String> filePath = new ArrayList();//filePath.add("D:\\JAVAStudy\\bpm学习\\SVN地址.txt");filePath.add("D:\\JAVAStudy\\学习进度\\学习目标及目标.txt");//filePath.add("D:\\JAVAStudy\\bpm学习\\BPM配置文档(1).docx");filePath.add("D:\\JAVAStudy\\bpm学习\\OA\\任务分配.png");//filePath.add("D:\\JAVAStudy\\微信支付.rar");SendEmaliUtil sendEmail = new SendEmaliUtil(true);long time1=System.currentTimeMillis();boolean isSend= sendEmail.sendEmail(subject, nickName, sendHtml, receiveUser, filePath);long time2=System.currentTimeMillis();System.err.println("sendEmail spend time:"+(time2-time1));}}
