技術標籤：Java

1. 開啟QQ郵箱SMTP服務

在QQ郵箱的設定 -> 賬戶中開啟POP3/SMTP服務

開啟成功後記下生成的授權碼（可代替原始密碼）

2. 簡單例項

建立一個Maven專案，在pom.xml中加入：

<dependencies>
    <dependency>
        <groupId>com.sun.mail</groupId>
        <artifactId>javax.mail</artifactId>
        <version>1.6.2</
 
version>
    </dependency>
</dependencies>

package com.example;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;


public class EmailSender {
    public static void main(String[] args) {
        final String srcEmail =
 
 "xxxxx";
        final String authCode = "xxxxx";
        String targetEmail = "xxxxx";

        Properties props = System.getProperties();
        props.setProperty("mail.smtp.host", "smtp.qq.com");
        props.put("mail.smtp.auth", "true"
 
);

        Session session = Session.getDefaultInstance(props, new Authenticator() {
            @Override
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(srcEmail,authCode);
            }
        });

        try {
            MimeMessage mimeMessage = new MimeMessage(session);
            mimeMessage.setFrom(new InternetAddress(srcEmail));
            mimeMessage.addRecipient(Message.RecipientType.TO, new InternetAddress(targetEmail));
            mimeMessage.setSubject("JavaEmail");
            mimeMessage.setText("Hello World!");
            Transport.send(mimeMessage);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

只需要自定義填寫前三個字串即可，分別為發件人郵箱地址、授權碼、收件人郵箱地址。