我想实现一个注册功能，然后注册里面添加一个激活功能。下面是运行效果图
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当界面出现恭喜注册成功，代码应该是没有抛异常才对，也就是能发送出去，而我是通过163邮箱向QQ邮箱发送消息，网上一查要打开授权，我按照网上的做法打开了
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然后我的配置文件里的密码也是授权时写的密码
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然后呢，现在就是注册功能是实现了，授权也开了，代码也不出错，但是就是发送不成功。我这个菜鸟已经不知道该怎么办了，求大神帮帮忙
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数据库里面是有数据的，说明注册成功了，下面是我的UserServlet里面的代码

package user.servlet;

import import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import javax.mail.MessagingException;
import javax.mail.Session;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.import cn.itcast.mail.Mail;
import cn.itcast.mail.MailUtils;
import cn.itcast.servlet.BaseServlet;
import user.domain.User;
import user.service.UserException;
import user.service.UserService;

public class UserServlet extends BaseServlet {
    private UserService userService = new UserService();
    
    /*
     * 激活功能
     */
     public String active(HttpServletRequest request, HttpServletResponse response)
             throws ServletException, IOException {
         System.out.println("恭喜激活成功！");
         return null;
     }
    
     public String regist(HttpServletRequest request, HttpServletResponse response)
             throws ServletException, IOException {
         // 封装表单数据
         User form = CommonUtils.toBean(request.getParameterMap(), User.class);
         // 补全数据
         form.setUid(CommonUtils.uuid());
         form.setCode(CommonUtils.uuid() + CommonUtils.uuid());
         // 输入校验
         Map<String,String> errors = new HashMap<String,String>();
         String username = form.getUsername();
         if (username == null || username.trim().isEmpty()) {
            errors.put("username", "用户名不能为空");
        } else if(username.length() < 3 || username.length() > 10) {
            errors.put("username", "用户名长度必须在3~10之间！");
        }
         String password = form.getPassword();
         if (password == null || password.trim().isEmpty()) {
            errors.put("password", "密码不能为空");
        } else if(password.length() < 3 || password.length() > 10) {
            errors.put("password", "密码长度必须在3~10之间！");
        }
         String email = form.getEmail();
         if (email == null || email.trim().isEmpty()) {
            errors.put("email", "邮箱不能为空");
        } else if(!email.matches("\\w+@\\w+\\.\\w+")) {
            errors.put("email", "邮箱格式不对！");
        }
         // 判断是否存在错误信息
         if (errors.size() > 0) {
            // 保存错误信息
            // 保存到表单数据
            // 转发到registe.jsp
             request.setAttribute("errors", errors);
             request.setAttribute("form", form);
             return "/jsps/user/regist.jsp";
        }
         
         // 调用service的registe()方法
         try {
            userService.regist(form);
        } catch (UserException e) {
            // 保存异常信息
            // 保存form
            // 转发到registe.jsp
            request.setAttribute("msg", e.getMessage());
            request.setAttribute("form", form);
            return "/jsps/user/regist.jsp";
        }
         // 发邮件
         Properties props = new Properties();
         props.load(this.getClass().getClassLoader().getResourceAsStream("email_template.properties"));
         String host = props.getProperty("host");// 获取服务器主机
         String uname = props.getProperty("uname");// 获取用户名
         String pwd = props.getProperty("pwd");// 获取密码
         String from = props.getProperty("from");// 获取发件人
         String to = form.getEmail();// 获取收件人
         String subject = props.getProperty("subject");// 获取主题
         String content = props.getProperty("content");// 获取邮件内容  
         content = MessageFormat.format(content, form.getCode());// 替换{0}
         
         Session session = MailUtils.createSession(host, uname, pwd);// 得到session
         Mail mail = new Mail(from, to, subject, content);// 创建邮件对象
         try {
            MailUtils.send(session, mail);// 发邮件
        } catch (MessagingException e) {
            
        }
         
         
         /*
          * 保存成功信息
          * 转发到msg.jsp
          */
         request.setAttribute("msg", "恭喜注册成功，请到邮箱激活！");
        return "/jsps/user/regist.jsp";
     }
}

下面是我register.jsp的代码

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java. %>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
    <title>注册</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <meta http-equiv="content-type" content="text/html;charset=utf-8">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>
  
  <body>
  <h1>注册</h1>
<p style="color: red; font-weight: 900">${msg }</p>
<form action="<c:url value='/UserServlet'/>" method="post">
    <input type="hidden" name="method" value="regist"/>
    用户名：<input type="text" name="username" value="${form.username }"/>
    <span style="color: red; font-weight: 900">${errors.username }</span>
    <br/>
    密　码：<input type="password" name="password" value="${form.password }"/>
    <span style="color: red; font-weight: 900">${errors.password }</span>
    <br/>
    邮　箱：<input type="text" name="email" value="${form.email }"/>
    <span style="color: red; font-weight: 900">${errors.email }</span>
    <br/>
    <input type="submit" value="注册"/>
</form>
  </body>
</html>

这个是我配置文件的代码

host=smpt.\u8FD9\u662F\u6765\u81EA\u81EA\u5DF1\u7684\u6FC0\u6D3B\u90AE\u4EF6
content=<a href\="http\://localhost\:8080/bookstore/UserServlet?method\=active&code\={0}">\u70B9\u51FB\u8FD9\u91CC\u5B8C\u6210\u6FC0\u6D3B</a>

如果发帖格式有什么不错的地方，请多包涵，下次会改正的，谢谢大家！！！

你要把异常打印出来，
e.printStackTrace();