Java實現郵件發送的具體代碼，供大家參考，具體內容如下
一、郵件服務器與傳輸協議
要在網絡上實現郵件功能，必須要有專門的郵件服務器。這些郵件服務器類似于現實生活中的郵局，它主要負責接收用戶投遞過來的郵件，并把郵件投遞到郵件接收者的電子郵箱中。
SMTP服務器地址：一般是 smtp.xxx.com，比如163郵箱是smtp.163.com，qq郵箱是smtp.qq.com。
SMTP協議
通常把處理用戶smtp請求(郵件發送請求)的服務器稱之為SMTP服務器(郵件發送服務器)。
POP3協議
通常把處理用戶pop3請求(郵件接收請求)的服務器稱之為POP3服務器(郵件接收服務器)。
二、Java發送郵件
使用到的jar包：
- mail.jar
- activation.jar
QQ郵箱需獲取相應的權限：
QQ郵箱–>郵箱設置–>賬戶–>POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV服務 開啟POP3/SMTP服務，然后獲取16位授權碼（注意不要將授權碼泄露，一個賬戶可以擁有多個授權碼）
Java實現純文本郵件發送
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package org.westos.email;import com.sun.mail.util.MailSSLSocketFactory;import javax.mail.*;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import java.security.GeneralSecurityException;import java.util.Properties;public class SendEamil { public static void main(String[] args) throws MessagingException, GeneralSecurityException { //創建一個配置文件并保存 Properties properties = new Properties(); properties.setProperty("mail.host","smtp.qq.com"); properties.setProperty("mail.transport.protocol","smtp"); properties.setProperty("mail.smtp.auth","true"); //QQ存在一個特性設置SSL加密 MailSSLSocketFactory sf = new MailSSLSocketFactory(); sf.setTrustAllHosts(true); properties.put("mail.smtp.ssl.enable", "true"); properties.put("mail.smtp.ssl.socketFactory", sf); //創建一個session對象 Session session = Session.getDefaultInstance(properties, new Authenticator() { @Override protected PasswordAuthentication getPasswordAuthentication() { } }); //開啟debug模式 session.setDebug(true); //獲取連接對象 Transport transport = session.getTransport(); //連接服務器 //創建郵件對象 MimeMessage mimeMessage = new MimeMessage(session); //郵件發送人 //郵件接收人 //郵件標題 mimeMessage.setSubject("Hello Mail"); //郵件內容 mimeMessage.setContent("我的想法是把代碼放進一個循環里","text/html;charset=UTF-8"); //發送郵件 transport.sendMessage(mimeMessage,mimeMessage.getAllRecipients()); //關閉連接 transport.close(); }} |
Java實現文本圖片附件復雜的郵件發送
MIME（多用途互聯網郵件擴展類型）
MimeBodyPart類
javax.mail.internet.MimeBodyPart類 表示的是一個MIME消息，它和MimeMessage類一樣都是從Part接口繼承過來。
MimeMultipart類
javax.mail.internet.MimeMultipart是抽象類 Multipart的實現子類,它用來組合多個MIME消息。一個MimeMultipart對象可以包含多個代表MIME消息的MimeBodyPart對象
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package org.westos.email;import com.sun.mail.util.MailSSLSocketFactory;import javax.activation.DataHandler;import javax.activation.FileDataSource;import javax.mail.*;import javax.mail.internet.*;import java.security.GeneralSecurityException;import java.util.Properties;public class SendComplexEmail { public static void main(String[] args) throws GeneralSecurityException, MessagingException { Properties prop = new Properties(); prop.setProperty("mail.host", "smtp.qq.com"); 設置QQ郵件服務器 prop.setProperty("mail.transport.protocol", "smtp"); // 郵件發送協議 prop.setProperty("mail.smtp.auth", "true"); // 需要驗證用戶名密碼 // QQ郵箱設置SSL加密 MailSSLSocketFactory sf = new MailSSLSocketFactory(); sf.setTrustAllHosts(true); prop.put("mail.smtp.ssl.enable", "true"); prop.put("mail.smtp.ssl.socketFactory", sf); //1、創建定義整個應用程序所需的環境信息的 Session 對象 Session session = Session.getDefaultInstance(prop, new Authenticator() { @Override protected PasswordAuthentication getPasswordAuthentication() { //傳入發件人的姓名和授權碼 } }); //2、通過session獲取transport對象 Transport transport = session.getTransport(); //3、通過transport對象郵箱用戶名和授權碼連接郵箱服務器 //4、創建郵件,傳入session對象 MimeMessage mimeMessage = complexEmail(session); //5、發送郵件 transport.sendMessage(mimeMessage,mimeMessage.getAllRecipients()); //6、關閉連接 transport.close(); } public static MimeMessage complexEmail(Session session) throws MessagingException { //消息的固定信息 MimeMessage mimeMessage = new MimeMessage(session); //發件人 //收件人 //郵件標題 mimeMessage.setSubject("帶圖片和附件的郵件"); //郵件內容 //準備圖片數據 MimeBodyPart image = new MimeBodyPart(); DataHandler handler = new DataHandler(new FileDataSource("E:\\IdeaProjects\\WebEmail\\resources\\測試圖片.png")); image.setDataHandler(handler); image.setContentID("test.png"); //設置圖片id //準備文本 MimeBodyPart text = new MimeBodyPart(); text.setContent("這是一段文本<img src='cid:test.png'>","text/html;charset=utf-8"); //附件 MimeBodyPart appendix = new MimeBodyPart(); appendix.setDataHandler(new DataHandler(new FileDataSource("E:\\IdeaProjects\\WebEmail\\resources\\測試文件.txt"))); appendix.setFileName("test.txt"); //拼裝郵件正文 MimeMultipart mimeMultipart = new MimeMultipart(); mimeMultipart.addBodyPart(image); mimeMultipart.addBodyPart(text); mimeMultipart.setSubType("related");//文本和圖片內嵌成功 //將拼裝好的正文內容設置為主體 MimeBodyPart contentText = new MimeBodyPart(); contentText.setContent(mimeMultipart); //拼接附件 MimeMultipart allFile = new MimeMultipart(); allFile.addBodyPart(appendix);//附件 allFile.addBodyPart(contentText);//正文 allFile.setSubType("mixed"); //正文和附件都存在郵件中，所有類型設置為mixed //放到Message消息中 mimeMessage.setContent(allFile); mimeMessage.saveChanges();//保存修改 return mimeMessage; }} |
JavaWeb發送郵件(網站注冊成功發送提示郵件)
1.User
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package org.westos.mail;public class User { private String name; private String password; private String mail; public User() { } public User(String name, String password, String mail) { this.name = name; this.password = password; this.mail = mail; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getMail() { return mail; } public void setMail(String mail) { this.mail = mail; } @Override public String toString() { return "User{" + "name='" + name + '\'' + ", password='" + password + '\'' + ", mail='" + mail + '\'' + '}'; }} |
2.Servlet
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package org.westos.mail;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;public class Servlet extends javax.servlet.http.HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } protected void doGet(HttpServletRequest request, HttpServletResponse response) { //處理前端請求 String username = request.getParameter("username"); String password = request.getParameter("password"); String email = request.getParameter("email"); //將信息封裝進user對象 User user = new User(username, password, email); SendMail sendMail = new SendMail(user); sendMail.start(); //開啟線程 request.setAttribute("msg","發送成功"); try { request.getRequestDispatcher("msg.jsp").forward(request,response); } catch (ServletException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }} |
3.SengMail
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package org.westos.mail;import com.sun.mail.util.MailSSLSocketFactory;import javax.mail.*;import javax.mail.internet.AddressException;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import java.security.GeneralSecurityException;import java.security.PublicKey;import java.util.Properties;public class SendMail extends Thread { //發件人信息 //發件人郵箱 //郵箱密碼 private String password = "16位授權碼"; //郵件發送的服務器 private String host = "smtp.qq.com"; //收件人信息 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"); properties.setProperty("mail.transport.protocol","smtp"); properties.setProperty("mail.smtp.auth","true"); //QQ存在一個特性設置SSL加密 MailSSLSocketFactory sf = null; try { sf = new MailSSLSocketFactory(); } catch (GeneralSecurityException e) { e.printStackTrace(); } sf.setTrustAllHosts(true); properties.put("mail.smtp.ssl.enable", "true"); properties.put("mail.smtp.ssl.socketFactory", sf); //創建一個session對象 Session session = Session.getDefaultInstance(properties, new Authenticator() { @Override protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(recipient,password); } }); //開啟debug模式 session.setDebug(true); //獲取連接對象 Transport transport = null; try { transport = session.getTransport(); } catch (NoSuchProviderException e) { e.printStackTrace(); } //連接服務器 transport.connect(host,From,password); //創建一個郵件發送對象 MimeMessage mimeMessage = new MimeMessage(session); //郵件發送人 mimeMessage.setFrom(new InternetAddress(recipient)); //郵件接收人 mimeMessage.setRecipient(Message.RecipientType.TO,new InternetAddress(user.getMail())); //郵件標題 mimeMessage.setSubject("網站注冊成功"); //郵件內容 mimeMessage.setContent("網站注冊成功，密碼為"+user.getPassword()+"，請妥善保管密碼","text/html;charset=UTF-8"); //發送郵件 transport.sendMessage(mimeMessage,mimeMessage.getAllRecipients()); transport.close(); }catch (Exception e){ e.printStackTrace(); } }} |
4.register.jsp
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<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head> <title>注冊頁面</title></head><body><form action="${pageContext.request.contextPath}/a.do" method="post"> <p>用戶名：<input type="text" name="username" required></p> <p>密碼：<input type="password" name="password" required></p> <p>郵箱：<input type="email" name="email" required></p> <p><input type="submit" value="提交"></p></form></body></html> |
5.msg.jsp
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<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head> <title>Title</title></head><body>${msg}</body></html> |
6.web.xml
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<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>Servlet</servlet-name> <servlet-class>org.westos.mail.Servlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>Servlet</servlet-name> <url-pattern>/a.do</url-pattern> </servlet-mapping></web-app> |
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/baolingye/article/details/96598222
