自己通过学习多人的代码，并整理了一个简单，调用方便的通过javaMail发送邮件。只需填写发件邮箱地址，密码；收件人地址，附件，选择是否保存，设置自己发送邮件时的昵称就ok了。代码自动匹配设置smtp服务地址和端口。
发送邮件需要邮箱地址和密码，开启POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV服务。各大邮箱使用外部登录验证的方式不一样，有些需要使用授权码登录链接，有些只需要邮箱登录密码，这个得根据你使用的邮箱服务平台的规定了。这里我收集了下面的邮箱smtp服务地址和端口，【QQ、Foxmail、139、126、163、Google(gmail)、Exchange、Outlook、、】这些足以够用了吧！不多说，看代码。
使用方法
public static void main(String[] args) throws Exception {List<String> map = new ArrayList<>();map.add("123456@");map.add("456789@");map.add("hahaha123@");new SendEmail("hahaha123@", "密码").setDebug(true).setMyNickName("这是我的昵称").addFile("C:/Users/25171/Pictures/timg.jpg")//添加附件.addFile("C:/Users/25171/Desktop/QQ图片0317192741.jpg")// .addFile(List<String> list)//添加附件集合.setSaveEmail("C:/User/2517/Desktop/name.eml")//保存邮件.addRecipientT0("251716795@")//添加收件人地址// .addRecipientT0(map)//添加收件人地址集合// .addRecipientCC(map)//添加密送收件人地址// .addRecipientBCC(map)//添加抄送收件人地址.createMail("标题", "发送的内容", "text/html;charset=utf-8").sendEmail(new SendEmail.Callback() {@Overridepublic void success(String s) {System.out.println(s);//发送完成后回调接口}@Overridepublic void error(String s, Exception e) {System.out.println(s);e.printStackTrace();//异常失败的回调接口}});}
主体工具代码
package com.sai.mail;import javax.activation.DataHandler;import javax.activation.FileDataSource;import javax.mail.*;import javax.mail.internet.*;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import java.util.*;public class SendEmail {public interface Callback {void success(String s);void error(String s, Exception e);}private Callback callback; //信息回调接口private Properties properties;//系统属性对象private String mailAccount; //发送邮箱地址private String mailPassword; //验证密码private Session session;//邮件会话对象private String myNickName; //昵称，发送时自己的昵称private boolean debug = false;//debug模式private boolean isSaveEmail = false;private String pathName = "exc.eml";//邮件保存时的public SendEmail(String mailAccount, String mailPassword) {this.mailAccount = mailAccount;this.mailPassword = mailPassword;}public SendEmail setSaveEmail(String pathName) {isSaveEmail = true;this.pathName = pathName;return this;}private List<String> recipientT0List = new ArrayList<>();//收件地址private List<String> recipientCCList = new ArrayList<>();//密送地址private List<String> recipientBCCList = new ArrayList<>();//抄送地址private List<String> filePath = new ArrayList<>();//附件public SendEmail setDebug(boolean sessionDebug) {debug = sessionDebug;return this;}/*** 设置多人收件人地址 */public SendEmail addRecipientT0(String address) {recipientT0List.add(address);return this;}public SendEmail addRecipientCC(String address) {recipientCCList.add(address);return this;}public SendEmail addRecipientBCC(String address) {recipientBCCList.add(address);return this;}public SendEmail addRecipientT0(List<String> address) {recipientT0List.addAll(address);return this;}public SendEmail addRecipientCC(List<String> address) {recipientCCList.addAll(address);return this;}public SendEmail addRecipientBCC(List<String> address) {recipientBCCList.addAll(address);return this;}/***添加文件***/public SendEmail addFile(String filePath) {this.filePath.add(filePath);return this;}public SendEmail addFile(List<String> list) {this.filePath.addAll(list);return this;}/****昵称设置**/public SendEmail setMyNickName(String name) {myNickName = name;return this;}private MimeMessage message;/*** @param title 主题* @param datas 内容* @param type 内容格式类型 text/html;charset=utf-8* @return s*/public SendEmail createMail(String title, String datas, String type) {if (mailAccount.length() == 0 || mailAccount.equals(null)) {System.err.println("发件地址不存在！");return this;}if (myNickName == null) {myNickName = mailAccount;}getProperties();if (!sync) return this;try {message = new MimeMessage(session);// 设置发送邮件地址,param1 代表发送地址 param2 代表发送的名称(任意的) param3 代表名称编码方式message.setFrom(new InternetAddress(mailAccount, myNickName, "utf-8"));setRecipientT0(); //添加接收人地址setRecipientCC(); //添加抄送接收人地址setRecipientBCC(); //添加密送接收人地址BodyPart messageBodyPart = new MimeBodyPart(); // 创建消息部分Multipart multipart = new MimeMultipart();// 创建多重消息messageBodyPart.setContent(datas, type); // 消息内容multipart.addBodyPart(messageBodyPart); // 设置文本消息部分addFile(multipart); //附件部分// 发送完整消息message.setContent(multipart);message.setSubject(title); // 设置邮件主题message.setSentDate(new Date()); // 设置发送时间message.saveChanges(); // 保存上面的编辑内容// 将上面创建的对象写入本地saveEmail(title);} catch (Exception e) {if (callback != null)callback.error("message error ", e);sync = false;}return this;}public void sendEmail(Callback callback) {this.callback = callback;if (!sync)return;try {Transport trans = session.getTransport();// 链接邮件服务器trans.connect(mailAccount, mailPassword);// 发送信息trans.sendMessage(message, message.getAllRecipients());// 关闭链接trans.close();if (callback != null)callback.success("发送完成");} catch (Exception e) {if (callback != null)callback.error("发送异常", e);}}private void saveEmail(String title) throws IOException, MessagingException {OutputStream out = null;if (isSaveEmail) {if (pathName.length() == 0 || pathName.equals(null)) {out = new FileOutputStream(title + ".eml");} else {String path[] = pathName.split("\\.");out = new FileOutputStream(path[0] + title + ".eml");}}message.writeTo(out);out.flush();out.close();}/*** 设置收件人地址信息*/private void setRecipientT0() throws MessagingException, UnsupportedEncodingException {if (recipientT0List.size() > 0) {InternetAddress[] sendTo = new InternetAddress[recipientT0List.size()];for (int i = 0; i < recipientT0List.size(); i++) {System.out.println("发送到:" + recipientT0List.get(i));sendTo[i] = new InternetAddress(recipientT0List.get(i), "", "UTF-8");}message.addRecipients(MimeMessage.RecipientType.TO, sendTo);}}/***设置密送地址**/private void setRecipientCC() throws MessagingException, UnsupportedEncodingException {if (recipientCCList.size() > 0) {InternetAddress[] sendTo = new InternetAddress[recipientCCList.size()];for (int i = 0; i < recipientCCList.size(); i++) {System.out.println("发送到:" + recipientCCList.get(i));sendTo[i] = new InternetAddress(recipientCCList.get(i), "", "UTF-8");}message.addRecipients(, sendTo);}}/***设置抄送邮件地址**/private void setRecipientBCC() throws MessagingException, UnsupportedEncodingException {if (recipientBCCList.size() > 0) {InternetAddress[] sendTo = new InternetAddress[recipientBCCList.size()];for (int i = 0; i < recipientBCCList.size(); i++) {System.out.println("发送到:" + recipientBCCList.get(i));sendTo[i] = new InternetAddress(recipientBCCList.get(i), "", "UTF-8");}message.addRecipients(MimeMessage.RecipientType.BCC, sendTo);}}/***添加附件****/private void addFile(Multipart multipart) throws MessagingException, UnsupportedEncodingException {if (filePath.size() == 0)return;for (int i = 0; i < filePath.size(); i++) {MimeBodyPart messageBodyPart = new MimeBodyPart();// 选择出每一个附件名String pathName = filePath.get(i);System.out.println("添加附件 ====>" + pathName);// 得到数据源FileDataSource fds = new FileDataSource(pathName);// 得到附件本身并至入BodyPartmessageBodyPart.setDataHandler(new DataHandler(fds));//采用这去除中文乱码messageBodyPart.setFileName(MimeUtility.encodeText(fds.getName()));multipart.addBodyPart(messageBodyPart);}}private boolean sync = true;/*** 规定设置 传输协议为smtp 根据输入的邮箱地址自动匹配smtp服务器地址与smtp服务器地址端口*/private void getProperties() {String account[] = mailAccount.split("@");String mailTpye = "";try {mailTpye = account[1];} catch (Exception e) {System.err.println("不正确的邮箱地址！");sync = false;return;}String SMTPHost = "";//smtp服务器地址String SMTPPort = "";//smtp服务器地址端口switch (mailTpye) {case "":case "":SMTPHost = "";SMTPPort = "465";break;case "":SMTPHost = "";SMTPPort = "25";break;case "":SMTPHost = "";SMTPPort = "25";break;case "":SMTPHost = "";SMTPPort = "465";break;case "":SMTPHost = "";SMTPPort = "25";break;case "":SMTPHost = "";SMTPPort = "25";break;case "":SMTPHost = "";SMTPPort = "25";break;case "":SMTPHost = "";SMTPPort = "465";break;case "":SMTPHost = "";SMTPPort = "465";break;default:System.err.println("暂时不支持此账号作为服务账号发送邮件！");return;}Properties prop = new Properties();prop.setProperty("mail.transport.protocol", "smtp"); // 设置邮件传输采用的协议smtpprop.setProperty("mail.smtp.host", SMTPHost);// 设置发送人邮件服务器的smtp地址prop.setProperty("mail.smtp.auth", "true");// 设置验证机制prop.setProperty("mail.smtp.port", SMTPPort);// SMTP 服务器的端口 (非 SSL 连接的端口一般默认为 25, 可以不添加, 如果开启了 SSL 连接,prop.setProperty("mail.smtp.socketFactory.class", ".ssl.SSLSocketFactory");prop.setProperty("mail.smtp.socketFactory.fallback", "false");prop.setProperty("mail.smtp.socketFactory.port", SMTPPort);properties = prop;session = Session.getInstance(properties);session.setDebug(debug);}}
完成这些需要导入的重要jar包：mail-1.4.1.jar(或者更高的版本) 和 activation 包，jdk1.8中rt.jar包含的activation包。所以jdk1.8的就无需考虑activation怎么下载了。
完成解析分配服务器地址和端口的主要函数（写的不怎么好）：
private void getProperties() {String account[] = mailAccount.split("@");String mailTpye = "";try {mailTpye = account[1];} catch (Exception e) {System.err.println("不正确的邮箱地址！");sync = false;return;}String SMTPHost = "";//smtp服务器地址String SMTPPort = "";//smtp服务器地址端口switch (mailTpye) {case "":case "":SMTPHost = "";SMTPPort = "465";break;case "":SMTPHost = "";SMTPPort = "25";break;case "":SMTPHost = "";SMTPPort = "25";break;case "":SMTPHost = "";SMTPPort = "465";break;case "":SMTPHost = "";SMTPPort = "25";break;case "":SMTPHost = "";SMTPPort = "25";break;case "":SMTPHost = "";SMTPPort = "25";break;case "":SMTPHost = "";SMTPPort = "465";break;case "":SMTPHost = "";SMTPPort = "465";break;default:System.err.println("暂时不支持此账号作为服务账号发送邮件！");return ;}Properties prop = new Properties();prop.setProperty("mail.transport.protocol", "smtp"); // 设置邮件传输采用的协议smtpprop.setProperty("mail.smtp.host", SMTPHost);// 设置发送人邮件服务器的smtp地址prop.setProperty("mail.smtp.auth", "true");// 设置验证机制prop.setProperty("mail.smtp.port", SMTPPort);// SMTP 服务器的端口 (非 SSL 连接的端口一般默认为 25, 可以不添加prop.setProperty("mail.smtp.socketFactory.class", ".ssl.SSLSocketFactory");prop.setProperty("mail.smtp.socketFactory.fallback", "false");prop.setProperty("mail.smtp.socketFactory.port", SMTPPort);properties = prop;session = Session.getInstance(properties);session.setDebug(debug);}
最后看看效果：
