JavaMail发送邮件

    当我们注册一个网站的时候，往往要通过邮件验证才可注册成功；或者我们忘记密码时，网站就会通过您的邮箱给您发送一份邮件，将密码告诉你。这些系统自动发送邮件的操作都可以通过Java中的JavaMail完成。

项目的结构如下：

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MyAuthenticator.java
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package bean;import javax.mail.Authenticator;import javax.mail.PasswordAuthentication;public class MyAuthenticator extends Authenticator {     private String userName;     private String password;      public MyAuthenticator(String userName, String password){         this.userName= userName;         this.password= password;     }      @Override     protected PasswordAuthentication getPasswordAuthentication() {         return new PasswordAuthentication(userName, password);     } } 

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RegisterServlet.java
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package control;import java.io.IOException; import java.util.Date; import java.util.Properties;  import javax.mail.Address; import javax.mail.Authenticator; import javax.mail.Message.RecipientType; import javax.mail.MessagingException; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import bean.MyAuthenticator;    public class RegisterServlet extends HttpServlet {     private static final long serialVersionUID = 1L;      public void doGet(HttpServletRequest request, HttpServletResponse response)             throws ServletException, IOException {               //获取前台用户输入的邮箱以及用户名        String toMail = request.getParameter("email");         String registerName = request.getParameter("userName");                  // 创建一个临时用户注册ID        String registerId = "" + Math.random() * Math.random();         //邮件发送成功后，用户点在邮箱中点击这个链接回到注册网站。                String url = "http://localhost:8080/JavaMailChecker/servlet/MailBackServlet?registerId=" + registerId;                 // 设置session值，将用户ID和用户名保存在session值中        HttpSession httpSession = request.getSession();         httpSession.setAttribute(registerId, registerName);         // 设置session的有效时间，为10分钟，10分钟内没有点击链接的话，注册将失败        httpSession.setMaxInactiveInterval(600);                  // 设置邮箱的属性        Properties props = new Properties();        // 若发送者的邮箱为其他服务器，例如163邮箱的话，就将下面服务器的值改为smtp.163.com        props.setProperty("mail.smtp.host", "smtp.qq.com");         props.setProperty("mail.smtp.auth", "true");         // 设置验证值，发送者的邮箱要通过验证才可以发送邮件        // 设置发送者的邮箱和密码，对其进行修改        String userName = "[e-mail]";         String password = "00000000";         Authenticator authenticator = new MyAuthenticator(userName, password);                  javax.mail.Session session = javax.mail.Session.getDefaultInstance(props,authenticator);         session.setDebug(true);                  try{                     Address from = new InternetAddress(userName);                     Address to = new InternetAddress(toMail);                                          MimeMessage msg = new MimeMessage(session);                     msg.setFrom(from);                     msg.setSubject("###网站注册");                     msg.setSentDate(new Date());                     msg.setContent("点击<a href='" + url + "'>" + url + "</a>完成注册！", "text/html;charset=utf-8");                     msg.setRecipient(RecipientType.TO, to);                      Transport.send(msg);         } catch(MessagingException e){             e.printStackTrace();         }                  request.getRequestDispatcher("/sendMailSuccess.jsp").forward(request, response);     }      public void doPost(HttpServletRequest request, HttpServletResponse response)             throws ServletException, IOException {         doGet(request, response);     } } 

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MailBackServlet.java
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package control;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 MailBackServlet extends HttpServlet {     private static final long serialVersionUID = 1L;      public void doGet(HttpServletRequest request, HttpServletResponse response)             throws ServletException, IOException {         String registerID = request.getParameter("registerId");         if(registerID == null){             request.getRequestDispatcher("/index.jsp").forward(request,response);             return ;         }                  String registerName = (String)request.getSession().getAttribute(registerID);          // 如果session设置的有限时间过期，则注册不成功，直接返回        if(registerName == null || registerName.equals("")){             request.getRequestDispatcher("/index.jsp").forward(request,response);             return ;         }                  request.setAttribute("registerName", registerName);         request.getRequestDispatcher("/registSuccess.jsp").forward(request,response);     }      public void doPost(HttpServletRequest request, HttpServletResponse response)             throws ServletException, IOException {         doGet(request, response);     } } 

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index.jsp
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html>   <head>     <title>用户注册利用邮箱进行验证</title>   </head>   <body>   <br/>     <form action="${pageContext.request.contextPath }/servlet/RegisterServlet" method="post">         <font size="24" color="red">用户注册</font/><br/>           邮箱:<input type="text" name="email" /><br/>           昵称:<input type="text" name="userName" /><br/>         <input type="submit" value="submit" /><br/>    </form>   </body> </html> 

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registSuccess.jsp
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html>   <head>     <title>注册成功</title>  </head>    <body>          您好，${registerName }  ，注册成功，正在跳转....<br/>       </body> </html> 

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  sendMailSuccess.jsp
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html>   <head>      <base href="<%=basePath%>">      <title>邮件已发送</title>  </head>    <body>       请在10分钟之内登录邮箱，点击链接完成注册.<br>  </body></html>

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1、如果出现上述错误，那么你要检查你的源邮箱中的SMTP/POP3服务是否开启，

##########################  Console  ##########################

DEBUG: setDebug: JavaMail version 1.3
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: useEhlo true, useAuth true

DEBUG: SMTPTransport trying to connect to host "smtp.qq.com", port 25

DEBUG SMTP RCVD: 220 smtp.qq.com Esmtp QQ Mail Server

DEBUG: SMTPTransport connected to host "smtp.qq.com", port: 25

DEBUG SMTP SENT: EHLO O8NUWIZBJXNTYWH
DEBUG SMTP RCVD: 250-smtp.qq.com
250-PIPELINING
250-SIZE 52428800
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN
250-MAILCOMPRESS
250 8BITMIME

DEBUG SMTP Found extension "PIPELINING", arg ""
DEBUG SMTP Found extension "SIZE", arg "52428800"
DEBUG SMTP Found extension "AUTH", arg "LOGIN PLAIN"
DEBUG SMTP Found extension "AUTH=LOGIN", arg ""
DEBUG SMTP Found extension "MAILCOMPRESS", arg ""
DEBUG SMTP Found extension "8BITMIME", arg ""
DEBUG SMTP: Attempt to authenticate
DEBUG SMTP SENT: AUTH LOGIN
DEBUG SMTP RCVD: 334 VXNlcm5hbWU6

DEBUG SMTP SENT: NTY5MjA0MjM3QHFxLmNvbQ==
DEBUG SMTP RCVD: 334 UGFzc3dvcmQ6

DEBUG SMTP SENT: MTk4ODEwMjgq
DEBUG SMTP RCVD: 454 Authentication failed, please open smtp flag first!

javax.mail.SendFailedException: Sending failed;
nested exception is:
    class javax.mail.AuthenticationFailedException
    at javax.mail.Transport.send0(Transport.java:218)
    at javax.mail.Transport.send(Transport.java:80)
    at control.RegisterServlet.doGet(RegisterServlet.java:65)
    
   ·····

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下面是qq邮箱中的设置：

2、如果是刚刚注册的邮箱将会出错，因为刚刚注册的邮箱SMTP服务并没有打开，在qq邮箱中会有提示，注册14天之后才可以设置SMTP打开。

QQ邮箱的POP3与SMTP服务器是什么？

QQ邮箱 POP3 和 SMTP 服务器地址设置如下：

邮箱POP3服务器（端口110）SMTP服务器（端口25）qq.compop.qq.comsmtp.qq.comSMTP服务器需要身份验证。

 

如果是设置POP3和SMTP的SSL加密方式，则端口如下：

POP3服务器（端口995）

SMTP服务器（端口465或587）。

搜狐邮箱服务器： pop.sohu.com
                               smtp.sohu.com
 
网易邮箱服务器： pop.163.com
                               smtp.163.com

新浪邮箱服务器： pop.sina.com
                               smtp.sina.com