java 发送QQ邮件工具类详细步骤

前言：通过发送QQ邮件提醒用户还书的时间到了。

第一步：打开QQ邮箱，点击设置->出现下面图片的界面，再点击账号，如图所示

 第二步：开启IMAP/SMTP服务，开启后会返回授权码，记得好好保存

 第三步：导入邮箱jar包

<!-- 邮箱 -->
		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-email</artifactId>
			<version>1.4</version>
		</dependency>

第四步：编写邮箱工具类sendEmailUtils

package com.library.core.utils;

import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SendmailUtil {

    // 设置服务器
    private static String KEY_SMTP = "mail.host";
    private static String VALUE_SMTP = "smtp.qq.com";

    private static String SMTP_PORT_KEY = "mail.smtp.port";
    private static String SMTP_PORT_VALUE = "465";
    // 服务器验证
    private static String MAIL_SMTP_AUTH = "mail.smtp.auth";
    private static String VALUE_AUTH = "true";
    // 发件人用户名、密码
    private String SEND_USER = "[email protected]";
    private String SEND_UNAME = "2431850729";
    private String SEND_PWD = "你的授权码";
    // 建立会话
    private MimeMessage message;
    private Session s;
 
    /*
     * 初始化方法
     */
    public SendmailUtil() {
        Properties props = System.getProperties();
        props.setProperty(KEY_SMTP, VALUE_SMTP);
        props.setProperty(MAIL_SMTP_AUTH, VALUE_AUTH);
        props.setProperty(SMTP_PORT_KEY,SMTP_PORT_VALUE );
        props.setProperty("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        props.setProperty("mail.smtp.socketFactory.fallback", "false");
        props.setProperty("mail.smtp.socketFactory.port", SMTP_PORT_VALUE);
        props.setProperty("mail.debug", "true");
        s =  Session.getDefaultInstance(props, new Authenticator(){
              protected PasswordAuthentication getPasswordAuthentication() {
                  return new PasswordAuthentication(SEND_UNAME, SEND_PWD);
              }});
        s.setDebug(true);
        message = new MimeMessage(s);
    }
 
    /**
     * 发送邮件
     * 
     * @param headName
     *            邮件头文件名
     * @param sendHtml
     *            邮件内容
     * @param receiveUser
     *            收件人地址
     */
    public void doSendHtmlEmail(String headName, String sendHtml,
            String receiveUser) {
        try {
            // 发件人
            InternetAddress from = new InternetAddress(SEND_USER);
            message.setFrom(from);
            // 收件人
            InternetAddress to = new InternetAddress(receiveUser);
            message.setRecipient(Message.RecipientType.TO, to);
            // 邮件标题
            message.setSubject(headName);
            String content = sendHtml.toString();
            // 邮件内容,也可以使纯文本"text/plain"
            message.setContent(content, "text/html;charset=GBK");
            message.saveChanges();
            Transport transport = s.getTransport("smtp");
            // smtp验证，就是你用来发邮件的邮箱用户名密码
            transport.connect(VALUE_SMTP, SEND_UNAME, SEND_PWD);
            // 发送
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
            System.out.println("send success!");
        } catch (AddressException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }
 
    public static void main(String[] args) {
       
        SendmailUtil se = new SendmailUtil();
        se.doSendHtmlEmail("message for your", "hello,I can take case for you？I need you vary much,can you help me", "[email protected]");
    }

}

 第五步：运行一下 main函数，效果图如下