标签：
register.jsp
1 <%@ page language="java" pageEncoding="UTF-8"%>
2 <!DOCTYPE HTML>
3 <html>
4 <head>
5 <title>注册页面</title>
6 </head>
7
8 <body>
9 <form action="${pageContext.request.contextPath}/servlet/RegisterServlet" method="post">
10 用户名：<input type="text" name="username"><br/>
11 密码：<input type="password" name="password"><br/>
12 邮箱：<input type="text" name="email"><br/>
13 <input type="submit" value="注册">
14 </form>
15 </body>
16 </html>
message.jsp
1 <%@ page language="java" pageEncoding="UTF-8"%>
2 <!DOCTYPE HTML>
3 <html>
4 <head>
5 <title>消息提示页面</title>
6 </head>
7
8 <body>
9 ${message}
10 </body>
11 </html>
User.java
1 package me.gacl.domain;
2
3 public class User {
4 private String username;
5 private String password;
6 private String email;
7 public String getUsername() {
8 return username;
9 }
10 public void setUsername(String username) {
11 this.username = username;
12 }
13 public String getPassword() {
14 return password;
15 }
16 public void setPassword(String password) {
17 this.password = password;
18 }
19 public String getEmail() {
20 return email;
21 }
22 public void setEmail(String email) {
23 this.email = email;
24 }
25 }
发送邮件是一件非常耗时的事情，因此这里设计一个线程类来发送邮件
1 package me.gacl.web.controller;
2
3 import java.util.Properties;
4 import javax.mail.Message;
5 import javax.mail.Session;
6 import javax.mail.Transport;
7 import javax.mail.internet.InternetAddress;
8 import javax.mail.internet.MimeMessage;
9 import me.gacl.domain.User;
10
11 /**
12 * @ClassName: Sendmail
13 * @Description: Sendmail类继承Thread，因此Sendmail就是一个线程类，这个线程类用于给指定的用户发送Email
14 * @author: 孤傲苍狼
15 * @date: 2015-1-12 下午10:43:48
16 *
17 */
18 public class Sendmail extends Thread {
19 //用于给用户发送邮件的邮箱
20 private String from = "gacl@sohu.com";
21 //邮箱的用户名
22 private String username = "gacl";
23 //邮箱的密码
24 private String password = "邮箱密码";
25 //发送邮件的服务器地址
26 private String host = "smtp.sohu.com";
27
28 private User user;
29 public Sendmail(User user){
30 this.user = user;
31 }
32
33 /* 重写run方法的实现，在run方法中发送邮件给指定的用户
34 * @see java.lang.Thread#run()
35 */
36 @Override
37 public void run() {
38 try{
39 Properties prop = new Properties();
40 prop.setProperty("mail.host", host);
41 prop.setProperty("mail.transport.protocol", "smtp");
42 prop.setProperty("mail.smtp.auth", "true");
43 Session session = Session.getInstance(prop);
44 session.setDebug(true);
45 Transport ts = session.getTransport();
46 ts.connect(host, username, password);
47 Message message = createEmail(session,user);
48 ts.sendMessage(message, message.getAllRecipients());
49 ts.close();
50 }catch (Exception e) {
51 throw new RuntimeException(e);
52 }
53 }
54
55 /**
56 * @Method: createEmail
57 * @Description: 创建要发送的邮件
58 * @Anthor:孤傲苍狼
59 *
60 * @param session
61 * @param user
62 * @return
63 * @throws Exception
64 */
65 public Message createEmail(Session session,User user) throws Exception{
66
67 MimeMessage message = new MimeMessage(session);
68 message.setFrom(new InternetAddress(from));
69 message.setRecipient(Message.RecipientType.TO, new InternetAddress(user.getEmail()));
70 message.setSubject("用户注册邮件");
71
72 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!!";
73 message.setContent(info, "text/html;charset=UTF-8");
74 message.saveChanges();
75 return message;
76 }
77 }
1 package me.gacl.web.controller;
2
3 import java.io.IOException;
4 import javax.servlet.ServletException;
5 import javax.servlet.http.HttpServlet;
6 import javax.servlet.http.HttpServletRequest;
7 import javax.servlet.http.HttpServletResponse;
8 import me.gacl.domain.User;
9 import me.gacl.service.UserService;
10
11 public class RegisterServlet extends HttpServlet {
12
13 public void doGet(HttpServletRequest request, HttpServletResponse response)
14 throws ServletException, IOException {
15 try{
16 String username = request.getParameter("username");
17 String password = request.getParameter("password");
18 String email = request.getParameter("email");
19 User user = new User();
20 user.setEmail(email);
21 user.setPassword(password);
22 user.setUsername(username);
23
24 System.out.println("把用户信息注册到数据库中");
25 //用户注册成功之后就使用用户注册时的邮箱给用户发送一封Email
26 //发送邮件是一件非常耗时的事情，因此这里开辟了另一个线程来专门发送邮件
27 Sendmail send = new Sendmail(user);
28 //启动线程，线程启动之后就会执行run方法来发送邮件
29 send.start();
30
31 //注册用户
32 //new UserService().registerUser(user);
33 request.setAttribute("message", "恭喜您，注册成功，我们已经发了一封带了注册信息的电子邮件，请查收，如果没有收到，可能是网络原因，过一会儿就收到了！！");
34 request.getRequestDispatcher("/message.jsp").forward(request, response);
35 }catch (Exception e) {
36 e.printStackTrace();
37 request.setAttribute("message", "注册失败！！");
38 request.getRequestDispatcher("/message.jsp").forward(request, response);
39 }
40 }
41
42 public void doPost(HttpServletRequest request, HttpServletResponse response)
43 throws ServletException, IOException {
44 doGet(request, response);
45 }
46 }
程序运行效果如下：
现在很多网站都有这样的功能，用户注册完成之后，网站根据我们注册时填写的邮箱给我们一封Email，然后点击Email中的超链接去激活我们的用户。这种功能就是这样实现的。
在总结使用JavaMail发送邮件时发现，将邮件发送到sina或者sohu的邮箱时，不一定能够马上收取得到邮件，总是有延迟，有时甚至会延迟很长的时间，甚至会被当成垃圾邮件来处理掉，或者干脆就拒绝接收，有时候为了看到邮件发送成功的效果，要等半天，实属无奈啊。
JavaWeb学习总结(五十三)——Web应用中使用JavaMail发送邮件
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原文地址：http://www.cnblogs.com/mitnick/p/5122321.html
