實(shí)現(xiàn)java發(fā)送郵件的過(guò)程大體有以下幾步：

準(zhǔn)備一個(gè)properties文件，該文件中存放SMTP服務(wù)器地址等參數(shù)。

利用properties創(chuàng)建一個(gè)Session對(duì)象

利用Session創(chuàng)建Message對(duì)象，然后設(shè)置郵件主題和正文

利用Transport對(duì)象發(fā)送郵件

需要的jar有2個(gè)：activation.jar和mail.jar

直接看個(gè)demo代碼

#----------------這兩個(gè)是構(gòu)建session必須的字段---------- #smtp服務(wù)器 mail.smtp.host=smtp.qq.com #身份驗(yàn)證 mail.smtp.auth=true #--------------------------------------------------------------#發(fā)送者的郵箱用戶名 mail.sender.username=xxx@xx.com #發(fā)送者的郵箱密碼 mail.sender.password=xxxxxxxxxxMailServer.properties View Code

下面是發(fā)送郵件的java代碼

import java.io.IOException; import java.io.InputStream; import java.util.Properties;import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import javax.mail.internet.MimeUtility;public class JavaMail {/*** Message對(duì)象將存儲(chǔ)我們實(shí)際發(fā)送的電子郵件信息，* Message對(duì)象被作為一個(gè)MimeMessage對(duì)象來(lái)創(chuàng)建并且需要知道應(yīng)當(dāng)選擇哪一個(gè)JavaMail session。*/private MimeMessage message;/*** Session類(lèi)代表JavaMail中的一個(gè)郵件會(huì)話。* 每一個(gè)基于JavaMail的應(yīng)用程序至少有一個(gè)Session（可以有任意多的Session）。* * JavaMail需要Properties來(lái)創(chuàng)建一個(gè)session對(duì)象。* 尋找"mail.smtp.host" 屬性值就是發(fā)送郵件的主機(jī)* 尋找"mail.smtp.auth" 身份驗(yàn)證，目前免費(fèi)郵件服務(wù)器都需要這一項(xiàng)*/private Session session;/**** 郵件是既可以被發(fā)送也可以被受到。JavaMail使用了兩個(gè)不同的類(lèi)來(lái)完成這兩個(gè)功能：Transport 和 Store。 * Transport 是用來(lái)發(fā)送信息的，而Store用來(lái)收信。對(duì)于這的教程我們只需要用到Transport對(duì)象。*/private Transport transport;private String mailHost="";private String sender_username="";private String sender_password="";private Properties properties = new Properties();/** 初始化方法*/public JavaMail(boolean debug) {InputStream in = JavaMail.class.getResourceAsStream("MailServer.properties");try {properties.load(in);this.mailHost = properties.getProperty("mail.smtp.host");this.sender_username = properties.getProperty("mail.sender.username");this.sender_password = properties.getProperty("mail.sender.password");} catch (IOException e) {e.printStackTrace();}session = Session.getInstance(properties);session.setDebug(debug);//開(kāi)啟后有調(diào)試信息message = new MimeMessage(session);}/*** 發(fā)送郵件* * @param subject* 郵件主題* @param sendHtml* 郵件內(nèi)容* @param receiveUser* 收件人地址*/public void doSendHtmlEmail(String subject, String sendHtml,String receiveUser) {try {// 發(fā)件人//InternetAddress from = new InternetAddress(sender_username);// 下面這個(gè)是設(shè)置發(fā)送人的Nick nameInternetAddress from = new InternetAddress(MimeUtility.encodeWord("幻影")+" <"+sender_username+">");message.setFrom(from);// 收件人InternetAddress to = new InternetAddress(receiveUser);message.setRecipient(Message.RecipientType.TO, to);//還可以有CC、BCC// 郵件主題 message.setSubject(subject);String content = sendHtml.toString();// 郵件內(nèi)容,也可以使純文本"text/plain"message.setContent(content, "text/html;charset=UTF-8");// 保存郵件 message.saveChanges();transport = session.getTransport("smtp");// smtp驗(yàn)證，就是你用來(lái)發(fā)郵件的郵箱用戶名密碼 transport.connect(mailHost, sender_username, sender_password);// 發(fā)送 transport.sendMessage(message, message.getAllRecipients());//System.out.println("send success!");} catch (Exception e) {e.printStackTrace();}finally {if(transport!=null){try {transport.close();} catch (MessagingException e) {e.printStackTrace();}}}}public static void main(String[] args) {JavaMail se = new JavaMail(false);se.doSendHtmlEmail("郵件主題", "郵件內(nèi)容", "xxx@XX.com");} } View Code

上面只能實(shí)現(xiàn)文本的發(fā)送，如果我們要發(fā)送附件，就需要用到Multipart對(duì)象了。

import java.io.File; import java.io.IOException; import java.io.InputStream; import java.util.Properties;import javax.activation.DataHandler; import javax.activation.DataSource; import javax.activation.FileDataSource; import javax.mail.BodyPart; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.Multipart; 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;public class JavaMailWithAttachment {private MimeMessage message;private Session session;private Transport transport;private String mailHost = "";private String sender_username = "";private String sender_password = "";private Properties properties = new Properties();/** 初始化方法*/public JavaMailWithAttachment(boolean debug) {InputStream in = JavaMailWithAttachment.class.getResourceAsStream("MailServer.properties");try {properties.load(in);this.mailHost = properties.getProperty("mail.smtp.host");this.sender_username = properties.getProperty("mail.sender.username");this.sender_password = properties.getProperty("mail.sender.password");} catch (IOException e) {e.printStackTrace();}session = Session.getInstance(properties);session.setDebug(debug);// 開(kāi)啟后有調(diào)試信息message = new MimeMessage(session);}/*** 發(fā)送郵件* * @param subject* 郵件主題* @param sendHtml* 郵件內(nèi)容* @param receiveUser* 收件人地址* @param attachment* 附件*/public void doSendHtmlEmail(String subject, String sendHtml, String receiveUser, File attachment) {try {// 發(fā)件人InternetAddress from = new InternetAddress(sender_username);message.setFrom(from);// 收件人InternetAddress to = new InternetAddress(receiveUser);message.setRecipient(Message.RecipientType.TO, to);// 郵件主題 message.setSubject(subject);// 向multipart對(duì)象中添加郵件的各個(gè)部分內(nèi)容，包括文本內(nèi)容和附件Multipart multipart = new MimeMultipart();// 添加郵件正文BodyPart contentPart = new MimeBodyPart();contentPart.setContent(sendHtml, "text/html;charset=UTF-8");multipart.addBodyPart(contentPart);// 添加附件的內(nèi)容if (attachment != null) {BodyPart attachmentBodyPart = new MimeBodyPart();DataSource source = new FileDataSource(attachment);attachmentBodyPart.setDataHandler(new DataHandler(source));// 網(wǎng)上流傳的解決文件名亂碼的方法，其實(shí)用MimeUtility.encodeWord就可以很方便的搞定// 這里很重要，通過(guò)下面的Base64編碼的轉(zhuǎn)換可以保證你的中文附件標(biāo)題名在發(fā)送時(shí)不會(huì)變成亂碼//sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder();//messageBodyPart.setFileName("=?GBK?B?" + enc.encode(attachment.getName().getBytes()) + "?=");//MimeUtility.encodeWord可以避免文件名亂碼 attachmentBodyPart.setFileName(MimeUtility.encodeWord(attachment.getName()));multipart.addBodyPart(attachmentBodyPart);}// 將multipart對(duì)象放到message中 message.setContent(multipart);// 保存郵件 message.saveChanges();transport = session.getTransport("smtp");// smtp驗(yàn)證，就是你用來(lái)發(fā)郵件的郵箱用戶名密碼 transport.connect(mailHost, sender_username, sender_password);// 發(fā)送 transport.sendMessage(message, message.getAllRecipients());System.out.println("send success!");} catch (Exception e) {e.printStackTrace();} finally {if (transport != null) {try {transport.close();} catch (MessagingException e) {e.printStackTrace();}}}}public static void main(String[] args) {JavaMailWithAttachment se = new JavaMailWithAttachment(true);File affix = new File("c:\\測(cè)試-test.txt");se.doSendHtmlEmail("郵件主題", "郵件內(nèi)容", "xxx@XXX.com", affix);// } }帶附件 View Code

來(lái)源：https://www.cnblogs.com/yejg1212/archive/2013/06/01/3112702.html

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轉(zhuǎn)載于:https://www.cnblogs.com/tiankafei/p/10340643.html

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