用Java實現發送郵件

發送郵件(簡單的文本郵件)

第一步，導入依賴

發送郵件所需要的依賴有

<dependency>
  <groupId>javax.mail</groupId>
  <artifactId>mail</artifactId>
  <version>1.4.7</version>
</dependency>
​
<dependency>
  <groupId>javax.activation</groupId>
  <artifactId>activation</artifactId>
  <version>1.1.1</version>
</dependency>

第二步，創建一個靜態頁面

頁面包括 郵箱 驗證碼 接收人的郵箱 發送的內容 提交按鈕

<form action="${pageContext.request.contextPath}/test" method="post">
   <p> 自己的郵箱：      <input type="email" name="username" value="[e-mail]"></p>
   <p> 驗證碼 ：        <input type="password" name="psw" value="emzspejrljnvbfad"></p>
    <p>發給誰：         <input type="email" name="touser"/> </p>
    <p style="color: red">發送內容：</p>
    <textarea name="textarea" rows="20" cols="100" style="font-size: 30px"></textarea>
    <p><input type="submit" value="確定"></p>
​
</form>

第三步，接收頁面發送過來的信息

用servlet中req接收

String uesrname = req.getParameter("username");
String psw = req.getParameter("psw");
String touser = req.getParameter("touser");
String textarea = req.getParameter("textarea");

第四步，創建一個發郵件的方法

public static void t1(String username,String passwprd,String touser,String textarea) throws Exception{
    Properties properties = new Properties();
    properties.setProperty("mail.host","smtp.qq.com");//設置qq郵件服務器
    properties.setProperty("mail.transport.protocol","smtp");//郵件發送協議
    properties.setProperty("mail.smtp.auth","true");//需要驗證用戶名密碼
    //qq郵箱還要ssl加密
    MailSSLSocketFactory sf=new MailSSLSocketFactory();
    sf.setTrustAllHosts(true);
    properties.put("mail.smtp,ssl.enable","true");
    properties.put("mail.smtp,ssl.socketFactory",sf);
    Session session= Session.getDefaultInstance(properties, new Authenticator() {
        @Override
        public PasswordAuthentication getPasswordAuthentication() {
            //發件人用戶名授權碼
            return new PasswordAuthentication("username","passwprd");
       }
   });
​
    session.setDebug(true);
    Transport transport = session.getTransport();
    transport.connect("smtp.qq.com","username","emzspejrljnvbfad");
    MimeMessage message = new MimeMessage(session);
    message.setFrom(new InternetAddress("username"));
    message.setRecipient(Message.RecipientType.TO,new InternetAddress("touser"));
    message.setSubject("****");
    message.setContent("textarea","text/html;charset=UTF-8");
    transport.sendMessage(message,message.getAllRecipients());
    transport.close();
}

第五步，調用方法並轉發頁面

try {
    test01.t1(uesrname,psw,touser,textarea);
} catch (Exception e) {
    e.printStackTrace();
}
resp.sendRedirect("/test_war/success.jsp");

自動發送郵件（線程）

常用在注冊后發送短信

第一步，寫一個簡單的寫郵箱的text框

<form action="${pageContext.request.contextPath}/test02" method="get">
    <input type="text" name="mailPath">
    <input type="submit">

第二步，獲取框里的信息

String mailpath = req.getParameter("mailPath");

第三步，序列化信息

public class User {
    private String mailPath;
​
    @Override
    public String toString() {
        return "User{" +
                "mailPath='" + mailPath + '\'' +
                '}';
   }
​
    public String getMailPath() {
        return mailPath;
   }
​
    public void setMailPath(String mailPath) {
        this.mailPath = mailPath;
   }
​
    public User(String mailPath) {
        this.mailPath = mailPath;
   }
}

第四步，創線程，獲取發送郵件路徑

public class sendmail extends Thread {
    private User user;
    public sendmail(User user){
        this.user=user;
   }
    @Override
    public void run() {
​
        try {
​
            Properties properties = new Properties();
        properties.setProperty("mail.host","smtp.qq.com");//設置qq郵件服務器
        properties.setProperty("mail.transport.protocol","smtp");//郵件發送協議
        properties.setProperty("mail.smtp.auth","true");//需要驗證用戶名密碼
        //qq郵箱還要ssl加密
        MailSSLSocketFactory sf=new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        properties.put("mail.smtp,ssl.enable","true");
        properties.put("mail.smtp,ssl.socketFactory",sf);
       Session session= Session.getDefaultInstance(properties, new Authenticator() {
            @Override
            public PasswordAuthentication getPasswordAuthentication() {
                //發件人用戶名授權碼
                return new PasswordAuthentication("******@qq.com","*****");
           }
       });
​
       session.setDebug(true);
        Transport transport = session.getTransport();
        transport.connect("smtp.qq.com","******@qq.com","*****");
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress("******@qq.com"));
        message.setRecipient(Message.RecipientType.TO,new InternetAddress(user.getMailPath()));
        message.setSubject("我是***");
        message.setContent("你好~","text/html;charset=UTF-8");
        transport.sendMessage(message,message.getAllRecipients());
        transport.close();
       } catch (GeneralSecurityException e) {
            e.printStackTrace();
       } catch (NoSuchProviderException e) {
            e.printStackTrace();
       } catch (MessagingException e) {
            e.printStackTrace();
       }
   }
}

第五步，執行線程，定向頁面

User user = new User(mailpath);
sendmail sendmail = new sendmail(user);
sendmail.start();
resp.sendRedirect("/test_war/success.jsp");

帶有附件/圖片的郵件

把 message.setContent("你好~","text/html;charset=UTF-8");

變為

//圖片
    MimeBodyPart body1 = new MimeBodyPart();
    body1.setDataHandler(new DataHandler(new FileDataSource(" ")));
    body1.setContentID("lt.png");
//文本
    MimeBodyPart body2 = new MimeBodyPart();
    body2.setContent("*************<img src='cid:lt.png' ","text/html;charset=utf-8");
//附件
    MimeBodyPart body3 = new MimeBodyPart();
    body3.setDataHandler(new DataHandler(new FileDataSource(" ")));
    body3.setFileName("lt1.properties");
//拼裝
    MimeMultipart mimeMultipart =new MimeMultipart();
    mimeMultipart.addBodyPart(body1);
    mimeMultipart.addBodyPart(body2);
    mimeMultipart.setSubType("related");//文本和圖片內嵌成功
//將拼裝好的正文設置為主體
    MimeBodyPart contentText = new MimeBodyPart();
​
    contentText.setContent(mimeMultipart);
//拼接附件
    MimeMultipart allFile = new MimeMultipart();
    allFile.addBodyPart(body3);
    allFile.addBodyPart(contentText);
    allFile.setSubType("mixed"); 
 message.setContent(allFile);
 message.saveChanges();