邮件发送 Response（狂神JavaWeb笔记）"/>
邮件发送 Response（狂神JavaWeb笔记）
邮件发送 Response（狂神JavaWeb笔记）
学习笔记源码地址
1、原理图
2、核心四个类库
3、jar包支持
activation-1.1.1.jar
mail-1.4.7.jar
4、简单实现（QQ邮箱）
（1）在idea中新建空的Java项目并将jar包导入到lib库中。
（2）登录QQ邮箱在设置中开启以下协议并生成授权码（授权码要记住）
（3）分析步骤
a.创建session对
b.创建Transport对象
c.使用邮箱的用户名和授权码连上邮件服务器
d.创建一个Message对象（需要传递session）
message需要指明发件人、收件人以及文件内容
e.发送邮件
f.关闭连接
（4）代码实现
import com.sun.mail.util.MailSSLSocketFactory;import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;//发送一封简单的邮件（纯文本）
public class Test {public static void main(String[] args) throws Exception {Properties prop = new Properties();prop.setProperty("mail.host", "smtp.qq.com"); //设置QQ邮件服务器prop.setProperty("mail.transport.protocol", "smtp"); //邮件发送协议prop.setProperty("mail.smtp.auth", "true"); //需要验证用户名、密码//关于QQ邮箱，需要设置SSL加密，加上以下代码即可（大厂）MailSSLSocketFactory sf = new MailSSLSocketFactory();sf.setTrustAllHosts(true);prop.put("mail.smtp.enable", "true");prop.put("mail.smtp.ssl.socketFactory", sf);//5个步骤//1、创建定义整个应用程序所需的环境信息的Session信息//下面这个QQ才有！！Session session = Session.getDefaultInstance(prop, new Authenticator() {@Overrideprotected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication("2414348659@qq.com", "授权码");}});//开启Session的debug模式，可以看到程序发送Email的运行状态（可以开启也可以不开启）session.setDebug(true);//2、通过Session得到transport对象Transport ts = session.getTransport();//3、使用邮箱的用户名和授权码 连接邮件服务器ts.connect("smtp.qq.com", "2414348659@qq.com", "授权码");//4、创建邮件:写邮件（需要传递Session）MimeMessage message = new MimeMessage(session);//发件人message.setFrom(new InternetAddress("2414348659@qq.com"));//收件人message.setRecipient(Message.RecipientType.TO, new InternetAddress("zhuyihao139@163.com"));//邮件主题message.setSubject("只包含文本的简单邮件");//邮件内容message.setContent("只包含文本的简单邮件（本质这一段是Html文本，可以更改样式）", "text/html;charset=UTF-8");//5、发送邮件ts.sendMessage(message, message.getAllRecipients());//关闭ts.close();}
}
5、带附件的发送(QQ邮箱)
Java代码实现
import com.sun.mail.util.MailSSLSocketFactory;import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import java.util.Properties;//发送一封简单的邮件（纯文本）
public class SendMail {public static void main(String[] args) throws Exception {Properties prop = new Properties();prop.setProperty("mail.host", "smtp.qq.com"); //设置QQ邮件服务器prop.setProperty("mail.transport.protocol", "smtp"); //邮件发送协议prop.setProperty("mail.smtp.auth", "true"); //需要验证用户名、密码//关于QQ邮箱，需要设置SSL加密，加上以下代码即可（大厂）MailSSLSocketFactory sf = new MailSSLSocketFactory();sf.setTrustAllHosts(true);prop.put("mail.smtp.enable", "true");prop.put("mail.smtp.ssl.socketFactory", sf);//5个步骤//1、创建定义整个应用程序所需的环境信息的Session信息//下面这个QQ才有！！Session session = Session.getDefaultInstance(prop, new Authenticator() {@Overrideprotected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication("2414348659@qq.com", "授权码");}});//开启Session的debug模式，可以看到程序发送Email的运行状态（可以开启也可以不开启）session.setDebug(true);//2、通过Session得到transport对象Transport ts = session.getTransport();//3、使用邮箱的用户名和授权码 连接邮件服务器ts.connect("smtp.qq.com", "2414348659@qq.com", "授权码");//4、创建邮件:写邮件（需要传递Session）MimeMessage message = new MimeMessage(session);//发件人message.setFrom(new InternetAddress("2414348659@qq.com"));//收件人message.setRecipient(Message.RecipientType.TO, new InternetAddress("zhuyihao139@163.com"));//邮件主题message.setSubject("复杂邮件内容");//===============复杂邮件内容============//图片数据MimeBodyPart image = new MimeBodyPart();//图片需要经过数据处理... DataHandler：数据处理DataHandler dh = new DataHandler(new FileDataSource("图片路径"));image.setDataHandler(dh); //在我们的Body主题中放入这个处理的图片数据image.setContentID("1.jpg"); //给图片设置一个ID，我们在后面可以使用！//准备正文数据MimeBodyPart text = new MimeBodyPart();//cid：通过cid:引用图片text.setContent("这是一封正文带图片<img src='cid:1.jpg'>的邮件", "text/html;charset=UTF-8");//准备附件MimeBodyPart body3 = new MimeBodyPart();body3.setDataHandler(new DataHandler(new FileDataSource("文件路径")));body3.setFileName("file1.docx"); //设置附件名字//描述数据关系（拼装数据）MimeMultipart mm = new MimeMultipart();mm.addBodyPart(text);mm.addBodyPart(image);mm.addBodyPart(body3);mm.setSubType("mixed");//设置到消息中，保存修改message.setContent(mm); //把最后编辑好的邮件放到消息中message.saveChanges(); //保存修改//===============复杂邮件内容============//5、发送邮件ts.sendMessage(message, message.getAllRecipients());//关闭ts.close();}
}
JavaWeb实现
（1）添加maven框架支持
（2）配置idea中内置的tomcat
（3）index.jsp
<%--Created by IntelliJ IDEA.User: 24143Date: 2021/10/31Time: 21:46To change this template use File | Settings | File Templates.
--%>
<%--index.jsp--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>注册</title>
</head>
<body>
<%--通过表单上传文件get：上传文件大小有限制post：无限制--%>
<form action="${pageContext.request.contextPath}/RegisterServlet.do" method="post">用户名：<input type="text" name="username"><br/>密 码：<input type="password" name="password"><br/>邮 箱：<input type=email name="email"><br/><input type="submit" value="注册">
</form>
</body>
</html>（4）web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns=""xmlns:xsi=""xsi:schemaLocation=" .xsd"version="4.0"><servlet><servlet-name>RegisterServlet</servlet-name><servlet-class>servlet.RegisterServlet</servlet-class></servlet><servlet-mapping><servlet-name>RegisterServlet</servlet-name><url-pattern>/RegisterServlet.do</url-pattern></servlet-mapping></web-app>
（5）pom.xml
<?xml version="1.0" encoding="UTF-8"?><project xmlns=".0.0" xmlns:xsi=""xsi:schemaLocation=".0.0 .0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.example</groupId><artifactId>JavaSendMail</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><name>JavaSendMail Maven Webapp</name><!-- FIXME change it to the project's website --><url>;/url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.7</maven.compiler.source><maven.compiler.target>1.7</maven.compiler.target></properties><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>4.0.1</version><scope>compile</scope></dependency></dependencies><build><finalName>JavaSendMail</finalName><pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) --><plugins><plugin><artifactId>maven-clean-plugin</artifactId><version>3.1.0</version></plugin><!-- see .html#Plugin_bindings_for_war_packaging --><plugin><artifactId>maven-resources-plugin</artifactId><version>3.0.2</version></plugin><plugin><artifactId>maven-compiler-plugin</artifactId><version>3.8.0</version></plugin><plugin><artifactId>maven-surefire-plugin</artifactId><version>2.22.1</version></plugin><plugin><artifactId>maven-war-plugin</artifactId><version>3.2.2</version></plugin><plugin><artifactId>maven-install-plugin</artifactId><version>2.5.2</version></plugin><plugin><artifactId>maven-deploy-plugin</artifactId><version>2.8.2</version></plugin></plugins></pluginManagement></build>
</project>（6）info.jsp
<%--Created by IntelliJ IDEA.User: 24143Date: 2021/11/1Time: 11:21To change this template use File | Settings | File Templates.
--%>
<%--info.jsp--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Success</title>
</head>
<body><h1>xxx网站温馨提示</h1>
${message}</body>
</html>（7）实体类User
package pojo;import java.io.Serializable;//User实体类
public class User implements Serializable {private String username;private String password;private String email;public User() {}public User(String username, String password, String email) {this.username = username;this.password = password;this.email = 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;}@Overridepublic String toString() {return "User{" +"username='" + username + '\'' +", password='" + password + '\'' +", email='" + email + '\'' +'}';}
}（8）工具类 util
package util;import com.sun.mail.util.MailSSLSocketFactory;
import pojo.User;import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;//工具类
//多线程实现用户体验！异步处理
public class SendMail extends Thread {private String from="2414348659@qq.com"; //发件人private String username="2414348659@qq.com"; //用户名private String password="授权码"; //邮箱的密码private String host="smtp.qq.com"; //发送邮件的服务器地址private User user;public SendMail(User user){this.user=user;}//重写run方法，在其中发送邮件给指定用户@Overridepublic void run() {try{Properties prop = new Properties();prop.setProperty("mail.host", "smtp.qq.com"); //何止QQ邮件服务器prop.setProperty("mail.transport.protocol", "smtp"); //邮件发送协议prop.setProperty("mail.smtp.auth", "true"); //需要验证用户名、密码//关于QQ邮箱，需要设置SSL加密，加上以下代码即可（大厂）MailSSLSocketFactory sf = new MailSSLSocketFactory();sf.setTrustAllHosts(true);prop.put("mail.smtp.enable", "true");prop.put("mail.smtp.ssl.socketFactory", sf);//1、创建定义整个应用程序所需的环境信息的Session信息//下面这个QQ才有！！Session session = Session.getDefaultInstance(prop, new Authenticator() {@Overrideprotected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication("2414348659@qq.com", "授权码");}});//开启Session的debug模式，可以看到程序发送Email的运行状态session.setDebug(true);//2、通过Session得到transport对象Transport ts = session.getTransport();//3、使用邮箱的用户名和授权码 连接邮件服务器ts.connect("smtp.qq.com", "2414348659@qq.com", "授权码");//4、创建邮件:写邮件（需要传递Session）MimeMessage message = new MimeMessage(session);message.setFrom(new InternetAddress("2414348659@qq.com")); //发件人message.setRecipient(Message.RecipientType.TO, new InternetAddress(user.getEmail())); //收件人message.setSubject("用户注册邮件"); //邮件主题String info="恭喜您注册成功，您的用户名："+user.getUsername()+"，您的密码："+user.getPassword()+"，请妥善报关，如有问题请联系网站客服！";message.setContent(info,"text/html;charset=UTF-8");message.saveChanges();//5、发送邮件ts.sendMessage(message, message.getAllRecipients());//关闭ts.close();} catch (Exception e) {e.printStackTrace();}}
}（9）servlet
package servlet;import pojo.User;
import util.SendMail;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;public class RegisterServlet extends HttpServlet {@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//接收用户请求，封装成对象String username = req.getParameter("username");String password = req.getParameter("password");String email = req.getParameter("email");User user = new User(username, password, email);//用户注册成功之后，给用户发一封邮件//使用线程来专门发送邮件，防止出现耗时，和网站注册人数较多的情况SendMail send = new SendMail(user);//启动线程，执行run方法发送邮件send.start();//这里写run()的话，得等邮件发送完了才跳转，用户体验贼差！！//注册用户req.setAttribute("message", "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！如网络不稳定，可能过会儿才能收到！");req.getRequestDispatcher("info.jsp").forward(req, resp);}@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {}
}
idea中项目目录结构
6、测试
运行tomcat
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邮件发送 Response（狂神JavaWeb笔记）
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