2、邮件发送
原理：
编写程序的四个核心类及程序流程：
需要的jar包：
简单QQ邮件（无附件）发送代码实现
//发送一封简单的邮件 public class MailDemo01 { public static void main(String[] args) throws Exception { Properties prop = new Properties(); prop.setProperty("mail.host","smtp.qq.com"); //设置QQ邮件服务器 prop.setProperty("mail.transport.protocol","smtp"); //邮件发送协议 prop.setProperty("mail.smtp.auth","true"); //需要验证用户名密码 //关于QQ邮箱，还要设置SSL加密，加上以下代码即可 MailSSLSocketFactory sf = new MailSSLSocketFactory(); sf.setTrustAllHosts(true); prop.put("mail.smtp.ssl.enable","true"); prop.put("mail.smtp.ssl.socketFactory",sf); //使用JavaMail发送邮件的5个步骤 //1、创建定义整个应用程序所需的环境信息的Session对象 Session session = Session.getDefaultInstance(prop, new Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { //发件人邮件用户名、授权码 return new PasswordAuthentication("406623380@qq.com","****************"); } }); //开启Session的debug模式，这样就可以查看到程序发送Email的运行状态 session.setDebug(true); //2、通过session得到transport对象 Transport ts = session.getTransport(); //3、使用邮箱的用户名和授权码连上邮件服务器 ts.connect("smtp.qq.com","406623380@qq.com","****************"); //4、创建邮件：写邮件 //注意需要传递Session MimeMessage message = new MimeMessage(session); //指明邮件的发件人 24736743 message.setFrom(new InternetAddress("406623380@qq.com")); //指明邮件的收件人，现在发件人和收件人是一样的，那就是自己给自己发 message.setRecipient(Message.RecipientType.TO,new InternetAddress("m15208881@163.com")); //邮件的标题 message.setSubject("只包含文本的简单邮件"); //邮件的文本内容 message.setContent("<h1 style='color:red'>你好啊！</h1>","text/html;charset=UTF-8"); //5、发送邮件 ts.sendMessage(message,message.getAllRecipients()); //6、关闭连接 ts.close(); } }
复杂QQ邮件（由附件）发送的实现
MIME（多用途互联网邮件扩展类型）
MineBodyPart类
MineMultipart类
代码实现：
public class MailDemo02 { public static void main(String[] args) throws Exception { Properties prop = new Properties(); prop.setProperty("mail.host","smtp.qq.com"); //设置QQ邮件服务器 prop.setProperty("mail.transport.protocol","smtp"); //邮件发送协议 prop.setProperty("mail.smtp.auth","true"); //需要验证用户名密码 //关于QQ邮箱，还要设置SSL加密，加上以下代码即可 MailSSLSocketFactory sf = new MailSSLSocketFactory(); sf.setTrustAllHosts(true); prop.put("mail.smtp.ssl.enable","true"); prop.put("mail.smtp.ssl.socketFactory",sf); //使用JavaMail发送邮件的5个步骤 //1、创建定义整个应用程序所需的环境信息的Session对象 Session session = Session.getDefaultInstance(prop, new Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { //发件人邮件用户名、授权码 return new PasswordAuthentication("406623380@qq.com","****************"); } }); //开启Session的debug模式，这样就可以查看到程序发送Email的运行状态 session.setDebug(true); //2、通过session得到transport对象 Transport ts = session.getTransport(); //3、使用邮箱的用户名和授权码连上邮件服务器 ts.connect("smtp.qq.com","406623380@qq.com","****************"); //4、创建邮件：写邮件 //注意需要传递Session MimeMessage message = new MimeMessage(session); //指明邮件的发件人 24736743 message.setFrom(new InternetAddress("406623380@qq.com")); //指明邮件的收件人，现在发件人和收件人是一样的，那就是自己给自己发 message.setRecipient(Message.RecipientType.TO,new InternetAddress("406623380@qq.com")); //邮件的标题 message.setSubject("复杂的邮件"); //=================================================================================== //准备图片数据 MimeBodyPart image = new MimeBodyPart(); //图片需要经过数据处理... DataHandler：数据处理 DataHandler dh = new DataHandler(new FileDataSource("C:\\Users\\wangyudong\\Desktop\\1.png")); image.setDataHandler(dh);//在我们的body中放入这个处理的图片数据 image.setContentID("bz.jpg");//给图片设置一个ID，我们在后面可以使用 //准备正文数据 MimeBodyPart text = new MimeBodyPart(); text.setContent("这是一封邮件正文带图片<img src='cid:bz.jpg'>的邮件","text/html;charset=UTF-8"); //描述数据关系 MimeMultipart mm = new MimeMultipart(); mm.addBodyPart(text); mm.addBodyPart(image); mm.setSubType("related"); //设置到消息中，保存修改 message.setContent(mm);//把最后编辑好的邮件放到消息当中 message.saveChanges();//保存修改！ //================================================================= //5、发送邮件 ts.sendMessage(message,message.getAllRecipients()); //6、关闭连接 ts.close(); } } ==================================================================================== public class MailDemo03 { public static void main(String[] args) throws Exception { Properties prop = new Properties(); prop.setProperty("mail.host","smtp.qq.com"); //设置QQ邮件服务器 prop.setProperty("mail.transport.protocol","smtp"); //邮件发送协议 prop.setProperty("mail.smtp.auth","true"); //需要验证用户名密码 //关于QQ邮箱，还要设置SSL加密，加上以下代码即可 MailSSLSocketFactory sf = new MailSSLSocketFactory(); sf.setTrustAllHosts(true); prop.put("mail.smtp.ssl.enable","true"); prop.put("mail.smtp.ssl.socketFactory",sf); //使用JavaMail发送邮件的5个步骤 //1、创建定义整个应用程序所需的环境信息的Session对象 Session session = Session.getDefaultInstance(prop, new Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { //发件人邮件用户名、授权码 return new PasswordAuthentication("406623380@qq.com","****************"); } }); //开启Session的debug模式，这样就可以查看到程序发送Email的运行状态 session.setDebug(true); //2、通过session得到transport对象 Transport ts = session.getTransport(); //3、使用邮箱的用户名和授权码连上邮件服务器 ts.connect("smtp.qq.com","406623380@qq.com","****************"); //4、连接上之后我们需要发送邮件； MimeMessage mimeMessage = imageMail(session); //5、发送邮件 ts.sendMessage(mimeMessage,mimeMessage.getAllRecipients()); //6、关闭连接 ts.close(); } public static MimeMessage imageMail(Session session) throws MessagingException{ //消息的固定信息 MimeMessage mimeMessage = new MimeMessage(session); //指明邮件的发件人 24736743 mimeMessage.setFrom(new InternetAddress("406623380@qq.com")); //指明邮件的收件人，现在发件人和收件人是一样的，那就是自己给自己发 mimeMessage.setRecipient(Message.RecipientType.TO,new InternetAddress("406623380@qq.com")); //邮件的标题 mimeMessage.setSubject("我也不知道是个什么东西就发给你了"); /* 编写邮件的内容 1.图片 2.附件 3.文本 */ //图片 MimeBodyPart body1 = new MimeBodyPart(); body1.setDataHandler(new DataHandler(new FileDataSource("C:\\Users\\wangyudong\\Desktop\\1.png"))); body1.setContentID("yhbxb.png");//图片设置ID //文本 MimeBodyPart body2 = new MimeBodyPart(); body2.setContent("请注意，我不是广告","text/html;charset=utf-8"); //附件 MimeBodyPart body3 = new MimeBodyPart(); body3.setDataHandler(new DataHandler(new FileDataSource("C:\\Users\\wangyudong\\Desktop\\1.png"))); body3.setFileName("1.png");//附件设置名字 MimeBodyPart body4 = new MimeBodyPart(); body4.setDataHandler(new DataHandler(new FileDataSource("C:\\Users\\wangyudong\\Desktop\\1.sql"))); body4.setFileName("");//附件设置名字 //拼装邮件正文内容 MimeMultipart multipart1 = new MimeMultipart(); multipart1.addBodyPart(body1); multipart1.addBodyPart(body2); multipart1.setSubType("related");//1.文本和图片内嵌成功 //new MimeBodyPart().setContent(multipart1); //将拼装好的正文内容设置为主体 MimeBodyPart contentText = new MimeBodyPart(); contentText.setContent(multipart1); //拼接附件 MimeMultipart allFile = new MimeMultipart(); allFile.addBodyPart(body3);//附件 allFile.addBodyPart(body4);//附件 allFile.addBodyPart(contentText);//正文 allFile.setSubType("mixed");//正文和附件都存在邮件中，所有类型设置为mixed //放到Message消息中 mimeMessage.setContent(allFile); mimeMessage.saveChanges(); return mimeMessage; } }
3、网站注册发送邮件的代码实现
准备文件：
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <!--Servlet 依赖--> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> <!--JSP依赖--> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> </dependency> <!--standard标签库--> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> <!--JSTL表达式的依赖--> <dependency> <groupId>javax.servlet.jsp.jstl</groupId> <artifactId>jstl-api</artifactId> <version>1.2</version> </dependency> <!--连接数据库--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.16</version> </dependency> <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.79</version> </dependency> <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload --> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.4</version> </dependency> <!-- https://mvnrepository.com/artifact/commons-io/commons-io --> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.11.0</version> </dependency> </dependencies> ====================================================================================== <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>$Title$</title> </head> <body> <form action="${pageContext.request.contextPath}/RegisterServlet.do" method="post"> 用户名：<input type="text" name="username"><br/> 密码：<input type="password" name="password"><br/> 邮箱：<input type="text" name="email"><br/> <input type="submit" value="注册"> </form> </body> </html> ===================================================================================== <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <h1>xxx网站温馨提示</h1> ${message} </body> </html> ====================================================================================== <?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>RegisterServlet</servlet-name> <servlet-class>com.kuang.servlet.RegisterServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>RegisterServlet</servlet-name> <url-pattern>/RegisterServlet.do</url-pattern> </servlet-mapping> </web-app>
代码实现：
public class User implements Serializable { private String username; private String password; private String email; public User() { } public User(String username, String password, String email) { this.username = username; this.password = password; this.email = email; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } @Override public String toString() { return "User{" + "username='" + username + '\'' + ", password='" + password + '\'' + ", email='" + email + '\'' + '}'; } } =================================================================================== //网站3秒原则：用户体验 //多线程实现用户体验！ 异步处理 public class SendMail extends Thread{ //用于给用户发送邮件的通知 private String from = "406623380@qq.com"; //邮箱的用户名 private String username = "406623380@qq.com"; //邮箱的密码 private String password = "****************"; //发送邮件的服务器地址 private String host = "smtp.qq.com"; private User user; public SendMail(User user){ this.user = user; } //重写run方法的实现，在run方法中发送邮件给指定的用户 @Override public void run() { try { Properties prop = new Properties(); prop.setProperty("mail.host",host); //设置QQ邮件服务器 prop.setProperty("mail.transport.protocol","smtp"); //邮件发送协议 prop.setProperty("mail.smtp.auth","true"); //需要验证用户名密码 //关于QQ邮箱，还要设置SSL加密，加上以下代码即可 MailSSLSocketFactory sf = new MailSSLSocketFactory(); sf.setTrustAllHosts(true); prop.put("mail.smtp.ssl.enable","true"); prop.put("mail.smtp.ssl.socketFactory",sf); //使用JavaMail发送邮件的5个步骤 //1、创建定义整个应用程序所需的环境信息的Session对象 Session session = Session.getDefaultInstance(prop, new Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { //发件人邮件用户名、授权码 return new PasswordAuthentication("406623380@qq.com","****************"); } }); //开启Session的debug模式，这样就可以查看到程序发送Email的运行状态 session.setDebug(true); //2、通过session得到transport对象 Transport ts = session.getTransport(); //3、使用邮箱的用户名和授权码连上邮件服务器 ts.connect("smtp.qq.com","406623380@qq.com","****************"); //4、创建邮件：写邮件 //注意需要传递Session MimeMessage message = new MimeMessage(session); //指明邮件的发件人 24736743 message.setFrom(new InternetAddress("406623380@qq.com")); //指明邮件的收件人，现在发件人和收件人是一样的，那就是自己给自己发 message.setRecipient(Message.RecipientType.TO,new InternetAddress(user.getEmail())); //邮件的标题 message.setSubject("只包含文本的简单邮件"); String info = "恭喜您注册成功，您的用户名："+user.getUsername()+"，您的密码："+user.getPassword()+"，请妥善保管，如有问题请联系网站客服！！"; //邮件的文本内容 message.setContent(info,"text/html;charset=UTF-8"); message.saveChanges(); //5、发送邮件 ts.sendMessage(message,message.getAllRecipients()); //6、关闭连接 ts.close(); }catch (Exception e){ throw new RuntimeException(e); } } } ================================================================================== public class RegisterServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //接受用户请求，封装成对象 String username = req.getParameter("username"); String password = req.getParameter("password"); String email = req.getParameter("email"); User user = new User(username, password, email); //用户注册成功之后，会给用户发送一封邮件 //我们使用线程来专门发送邮件，防止出现耗时，和网络注册人数过多的情况 SendMail send = new SendMail(user); //启动线程，线程启动之后就会执行run方法来发送邮件 //send.run();为不使用多线程，页面反应较慢 send.start();//使用多线程进行操作 //注册用户 req.setAttribute("message","注册成功，我们已经发送了一封带了注册信息的电子邮件，请查收！如网络不稳定，可能过会才能收到！！"); req.getRequestDispatcher("info.jsp").forward(req,resp); } }
