本文是介绍在一个小的javaweb项目中，利用邮箱帮用户找回密码。
效果展示
需要一个发送邮件的jar包 ： javax.mail .jar
1.jsp页面（设置邮箱输入框）
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<%@ page language="java" contenttype="text/html; charset=utf-8"
pageencoding="utf-8"%>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>找回密码-图书管理系统</title>
<link rel="stylesheet" href="bootstrap/css/bootstrap.min.css" rel="external nofollow" >
<script type="text/javascript" src="bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
<div style="text-align: center" width="300px" height="200px">
<form action="retrievepassword.do" method="post">
<input type="email" name="email" id="email" width="100px"
height="60px" style="margin-top: 100px" placeholder="请输入您的邮箱地址"
required> <br>
<br>
<button type="submit" class="btn btn-success" id="button"
width="100px" height="60px">找回密码</button>
</form>
<br>
<br>
<button type="button" class="btn btn-primary" id="button"
onclick="backlogin()" width="100px" height="60px">返回登录页面</button>
</div>
<script type="text/javascript">
function backlogin() {
window.location.href = "login.jsp"
}
</script>
</body>
</html>
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2.servlet代码（根据用户输入的邮箱账号找到用户，并生成发送邮件类的实例，再设置收件人和要发送的内容，最后发送邮件）
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/**
* @see httpservlet#dopost(httpservletrequest request, httpservletresponse response)
*/
protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
//获取用户的邮箱
string email = request.getparameter("email");
admin admin = null;
user user = null;
printwriter out = response.getwriter();
//实例化一个发送邮件的对象
sendmail mysendmail = new sendmail();
//根据邮箱找到该用户信息
admin = adminservice.getadminbyemail(email);
if(admin!=null) {
//设置收件人和消息内容
mysendmail.sendmail(email, "图书管理系统提醒，您的密码为："+admin.getpassword());
out.println("<script>alert('恭喜，找回密码成功');window.location.href='login.jsp'</script>");
} else {
user = userservice.getuserbyemail(email);
if(user!=null) {
mysendmail.sendmail(email, "图书管理系统提醒，您的密码为："+user.getpassword());
out.println("<script>alert('恭喜，找回密码成功');window.location.href='login.jsp'</script>");
}
}
out.println("<script>alert('该邮箱尚未注册！请重新输入');window.location.href='retrievepassword.jsp'</script>");
}
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3.发送邮件类
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package com.bookms.util;
import javax.mail.messagingexception;
import javax.mail.nosuchproviderexception;
import javax.mail.session;
import javax.mail.transport;
import javax.mail.internet.internetaddress;
import javax.mail.internet.mimemessage;
import java.util.date;
import java.util.properties;
public class sendmail {
// 发件人的邮箱账号如：xxx@163.com
public static string sendemailaccount = "";
// 发件人的邮箱的授权码(自己在邮箱服务器中开启并设置)
public static string sendemailpassword = "";
// 发件人邮箱的smtp服务器地址，如：smtp.163.com
public static string sendemailsmtphost = "smtp.163.com";
// 收件人的邮箱账号
public static string receivemailaccount = "";
// 把发送邮件封装为函数，参数为收件人的邮箱账号和要发送的内容
public void sendmail(string receivemailaccount, string mailcontent) {
// 创建用于连接邮件服务器的参数配置
properties props = new properties();
// 设置使用smtp协议
props.setproperty("mail.transport.protocol", "smtp");
// 设置发件人的smtp服务器地址
props.setproperty("mail.smtp.host", sendemailsmtphost);
// 设置需要验证
props.setproperty("mail.smtp.auth", "true");
// 根据配置创建会话对象, 用于和邮件服务器交互
session session = session.getinstance(props);
// 设置debug模式，便于查看发送过程所产生的日志
session.setdebug(true);
try {
// 创建一封邮件
mimemessage message = createmimemessage(session, sendemailaccount, receivemailaccount, mailcontent);
// 根据 session 获取邮件传输对象
transport transport = session.gettransport();
transport.connect(sendemailaccount, sendemailpassword);
// 发送邮件, 发到所有的收件地址, 通过message.getallrecipients() 可以获取到在创建邮件对象时添加的所有收件人
transport.sendmessage(message, message.getallrecipients());
// 关闭连接
transport.close();
} catch (nosuchproviderexception e) {
// todo auto-generated catch block
e.printstacktrace();
} catch (messagingexception e) {
// todo auto-generated catch block
e.printstacktrace();
} catch (exception e) {
// todo auto-generated catch block
e.printstacktrace();
}
}
/**
*
* @param session
* 和服务器交互的会话
* @param sendmail
* 发件人邮箱
* @param receivemail
* 收件人邮箱
* @return
* @throws exception
*/
public static mimemessage createmimemessage(session session, string sendmail, string receivemail,
string mailcontent) throws exception {
// 创建一封邮件
mimemessage message = new mimemessage(session);
// 设置发件人姓名和编码格式
message.setfrom(new internetaddress(sendmail, "图书管理系统", "utf-8"));
// 收件人
message.setrecipient(mimemessage.recipienttype.to, new internetaddress(receivemail, "尊敬的用户", "utf-8"));
// 设置邮件主题
message.setsubject("找回密码提醒", "utf-8");
// 设置邮件正文
message.setcontent(mailcontent, "text/html;charset=utf-8");
// 设置发件时间
message.setsentdate(new date());
// 保存设置
message.savechanges();
return message;
}
}
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注意此处用的授权码，需要自己登录邮箱去设置，如163邮箱设置如下：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_40348465/article/details/83629000