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Java发送邮件

1. 用Java发送邮件，首先得导入两个jar包；

2. 我这里是以发送QQ邮箱为例的。

   

3. 发送一份纯文本的邮件

import com.sun.mail.util.MailSSLSocketFactory;import javax.mail.*;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import java.security.GeneralSecurityException;import java.util.Properties;public class SendMail {
       public static void main(String[] args) throws MessagingException, GeneralSecurityException {
           //创建配置文件 保存和读取信息        Properties properties = new Properties();        //设置邮件服务器        properties.setProperty("mail.host","smtp.qq.com");        //设置发送协议        properties.setProperty("mail.transport.protocol","smtp");        //设置用户验证        properties.setProperty("mail.smtp.auth","true");                //QQ邮箱要设置一个安全工厂        MailSSLSocketFactory sf = new MailSSLSocketFactory();        sf.setTrustAllHosts(true);        properties.setProperty("mail.smtp.ssl.enable","true");        properties.setProperty("mail.smtp.ssl.socketFactory","sf");                Session session = Session.getDefaultInstance(properties, new Authenticator() {
               @Override            protected PasswordAuthentication getPasswordAuthentication() {
                   return new PasswordAuthentication("1138954180@qq.com","zuyrcoenqrrfjgff");            }        });        //开启debug模式 查看邮件发送情况        session.setDebug(true);        //获取连接对象        Transport transport = session.getTransport();        //连接服务器        transport.connect("smtp.qq.com","zuyrcoenqrrfjgff");        //创建一个电子邮件对象        MimeMessage mimeMessage = textMail(session);        //发送邮件        transport.sendMessage(mimeMessage,mimeMessage.getAllRecipients());        //关闭传输        transport.close();    }    public static MimeMessage textMail(Session session) throws MessagingException {
           //创建邮件对象        MimeMessage mimeMessage = new MimeMessage(session);        //发送人        mimeMessage.setFrom(new InternetAddress("1138954180@qq.com"));        //邮件接收人，可以同时发送给很多人        mimeMessage.setRecipient(Message.RecipientType.TO,new InternetAddress("1138954180@qq.com"));        //邮件标题        mimeMessage.setSubject("Hello World!");        //邮件内容        mimeMessage.setContent("java写的发送邮件","text/html;charset=utf-8");        return mimeMessage;    }}

注册成功发送邮件

这里需要几个配置文件：User.java：用户实体类RegisterServlet.java：注册的servlet文件register.jsp:注册页面

User.java

public class User {
       private String username;    private String password;    private  String email;    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;    }    @Override    public String toString() {
           return "User{" +                "username='" + username + '\'' +                ", password='" + password + '\'' +                ", email='" + email + '\'' +                '}';    }}

RegisterServlet.java

import com.baidu.email.SendEmail;import com.baidu.pojo.User;import java.io.IOException;public class RegisterServlet extends javax.servlet.http.HttpServlet {
       private static User user;    protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
           doGet(request,response);    }    protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
    	   //设置编码格式        response.setCharacterEncoding("utf-8");        request.setCharacterEncoding("utf-8");        //从前端得到姓名和密码        String username = request.getParameter("username");        String password = request.getParameter("password");        String email = request.getParameter("email");        user = new User(username,password,email);        new SendEmail().start();        //注册成功 转发到这个页面        request.getRequestDispatcher("info.jsp").forward(request,response);    }    public static User getUser(){
           System.out.println(user);        return user;    }}

info.jsp

<%--  Created by IntelliJ IDEA.  User: 35158  Date: 2019/7/19  Time: 13:34  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %>    
注册成功！

register.jsp

<%--  Created by IntelliJ IDEA.  User: 35158  Date: 2019/7/19  Time: 10:39  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %>    
   
    
    
用户名：
    
    
密码：
    
    
邮件：
    
    
   

web.xml

   
       
            
     
      RegisterServlet
             
     
      com.baidu.servlet.RegisterServlet
         
        
            
     
      RegisterServlet
             
     
      /register
         
    
   

这时，你查看你自己的邮箱，就会有一封邮件啦。

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