1:下载mail.jar和activation.jar并加载到项目中
下面由一个实例来说JavaMail是怎样发送邮件的(实例来自于李刚老师的《经典java EE》)
2:JavaMail发送邮件的步骤
- 创建邮件的Session实例
- 以Session实例为参数创建MimeMessage对象
- 为MimeMessage对象设置合适的属性和内容
- 使用抽象类Transport的send()或sendMessage()方法发送邮件
import java.util.*; import java.io.*; import javax.mail.*; import javax.mail.internet.*; import javax.activation.*; public class SendMail { //收件人邮箱地址 private String to; //发件人邮箱地址 private String from; //SMTP服务器地址 private String smtpServer; //登录SMTP服务器的用户名 private String username ; //登录SMTP服务器的密码 private String password ; //邮件主题 private String subject; //邮件正文 private String content; //记录所有附件文件的集合 List<String> attachments = new ArrayList<String>(); //无参数的构造器 public SendMail() { } public SendMail(String to , String from , String smtpServer , String username , String password , String subject , String content) { this.to = to; this.from = from; this.smtpServer = smtpServer; this.username = username; this.password = password; this.subject = subject; this.content = content; } //to属性的setter方法 public void setTo(String to) { this.to = to; } //from属性的setter方法 public void setFrom(String from) { this.from = from; } //smtpServer属性的setter方法 public void setSmtpServer(String smtpServer) { this.smtpServer = smtpServer; } //username属性的setter方法 public void setUsername(String username) { this.username = username; } //password属性的setter方法 public void setPassword(String password) { this.password = password; } //subject属性的setter方法 public void setSubject(String subject) { this.subject = subject; } //content属性的setter方法 public void setContent(String content) { this.content = content; } //把邮件主题转换为中文 public String transferChinese(String strText) { try { strText = MimeUtility.encodeText( new String(strText.getBytes() , "GB2312"), "GB2312", "B"); } catch(Exception e) { e.printStackTrace(); } return strText; } //增加附件，将附件文件名添加的List集合中 public void attachfile(String fname) { attachments.add(fname); } //发送邮件 public boolean send() { //创建邮件Session所需的Properties对象 Properties props = new Properties(); props.put("mail.smtp.host" , smtpServer); props.put("mail.smtp.auth" , "true"); //创建Session对象 Session session = Session.getDefaultInstance(props //以匿名内部类的形式创建登录服务器的认证对象 , new Authenticator() { public PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(username,password); } }); try { //构造MimeMessage并设置相关属性值 MimeMessage msg = new MimeMessage(session); //设置发件人 msg.setFrom(new InternetAddress(from)); //设置收件人 InternetAddress[] addresses = {new InternetAddress(to)}; msg.setRecipients(Message.RecipientType.TO , addresses); //设置邮件主题 subject = transferChinese(subject); msg.setSubject(subject); //构造Multipart Multipart mp = new MimeMultipart(); //向Multipart添加正文 MimeBodyPart mbpContent = new MimeBodyPart(); mbpContent.setText(content); //将BodyPart添加到MultiPart中 mp.addBodyPart(mbpContent); //向Multipart添加附件 //遍历附件列表，将所有文件添加到邮件消息里 for(String efile : attachments) { MimeBodyPart mbpFile = new MimeBodyPart(); //以文件名创建FileDataSource对象 FileDataSource fds = new FileDataSource(efile); //处理附件 mbpFile.setDataHandler(new DataHandler(fds)); mbpFile.setFileName(fds.getName()); //将BodyPart添加到MultiPart中 mp.addBodyPart(mbpFile); } //清空附件列表 attachments.clear(); //向Multipart添加MimeMessage msg.setContent(mp); //设置发送日期 msg.setSentDate(new Date()); //发送邮件 Transport.send(msg); } catch (MessagingException mex) { mex.printStackTrace(); return false; } return true; } public static void main(String[] args) { SendMail sendMail = new SendMail(); sendMail.setSmtpServer("smtp.sina.com"); //此处设置登录的用户名 sendMail.setUsername("itcrazy0918@sina.com"); //此处设置登录的密码 sendMail.setPassword("0911612412"); //设置收件人的地址 sendMail.setTo("itcrazy0918@sina.com"); //设置发送人地址 sendMail.setFrom("itcrazy0918@sina.com"); //设置标题 sendMail.setSubject("测试邮件标题！"); //设置内容 sendMail.setContent("你好这是一个带多附件的测试邮件！"); //粘贴附件 sendMail.attachfile("C:/Login6 (1).jpg"); if (sendMail.send()) { System.out.println("---邮件发送成功---"); } } }
上述程序使用了新浪的邮件服务器，它将使用itcrazy0918@sina.com账户给自己发一封邮件，还有一个图片的附件
如图：
