注册时，给用户邮箱发送激活链接（java 发送邮件）

(转)http://www.cnblogs.com/xdp-gacl/p/4220190.html

注册界面：

<%@ page language="java" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
  <head>
    <title>注册页面</title>
  </head>
  
  <body>
    <form action="${pageContext.request.contextPath}/servlet/RegisterServlet" 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>

发送成功提示界面：

message.jsp

<%@ page language="java" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
  <head>
    <title>消息提示页面</title>
  </head>
  
  <body>
       ${message}
  </body>
</html>

User.java

package com.hmx.controller;

public class User {
    private String username;
    private String password;
    private String 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;
    }
}

RegisterServlet.java

package com.hmx.controller;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class RegisterServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try{
            String username = request.getParameter("username");
            String password = request.getParameter("password");
            String email = request.getParameter("email");
            User user = new User();
            user.setEmail(email);
            user.setPassword(password);
            user.setUsername(username);
            
            System.out.println("把用户信息注册到数据库中");
            //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
            //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
            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.start();
            
            //注册用户
            //new UserService().registerUser(user);
            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！！");
            request.getRequestDispatcher("/message.jsp").forward(request, response);
        }catch (Exception e) {
            e.printStackTrace();
            request.setAttribute("message", "注册失败！！");
            request.getRequestDispatcher("/message.jsp").forward(request, response);
        }
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }
}

SendMail.java

package com.hmx.controller;

import java.util.Properties;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

/**
* @ClassName: Sendmail
* @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
**/
public class SendMail extends Thread {
        //用于给用户发送邮件的邮箱
    private String from = "邮箱名称";
        //邮箱的用户名
    private String username = "邮箱名称";
        //邮箱的密码
    private String password = "密码";
        //发送邮件的服务器地址（根据发送邮箱情况修改）
    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
     * @see java.lang.Thread#run()
     */
    @Override
    public void run() {
        try{
            Properties prop = new Properties();
            prop.setProperty("mail.host", host);
            prop.setProperty("mail.transport.protocol", "smtp");
            prop.setProperty("mail.smtp.auth", "true");
            Session session = Session.getInstance(prop);
            session.setDebug(true);
            Transport ts = session.getTransport();
            ts.connect(host, username, password);
            Message message = createEmail(session,user);
            ts.sendMessage(message, message.getAllRecipients());
            ts.close();
        }catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    
    /**
    * @Method: createEmail
    * @Description: 创建要发送的邮件
    *
    * @param session
    * @param user
    * @return
    * @throws Exception
    */ 
    public Message createEmail(Session session,User user) throws Exception{
        
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(from));
        message.setRecipient(Message.RecipientType.TO, new InternetAddress(user.getEmail()));
        message.setSubject("用户注册邮件");
        
        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!! \n 激活链接";
        message.setContent(info, "text/html;charset=UTF-8");
        message.saveChanges();
        return message;
    }
}

注：

在QQ邮箱中有一项如果不设置，得到的会是 ”454 Authentication failed, please open smtp flag first! “

在QQ邮箱的设置里面，找到账户-》POP3/IMAP/SMTP选择开启POP3/SMTP服务

注册时，给用户邮箱发送激活链接（java 发送邮件）

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