issue # smtp 설정 중

src/main/java/com/baekyangdan/scheduler/config/MailConfig.java

@@ -0,0 +1,20 @@
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+import lombok.Getter;
+
+@Getter
+@Component
+public class MailConfig {
+
+    @Value("${spring.mail.username}")
+    private String username;
+
+    @Value("${spring.mail.clientId}")
+    private String clientId;
+
+    @Value("${spring.mail.clientSecret}")
+    private String clientSecret;
+
+    @Value("${spring.mail.refershToken}")
+    private String refreshToken;
+}

src/main/java/com/baekyangdan/scheduler/service/mail/MailService.java

@@ -0,0 +1,57 @@
+package com.baekyangdan.scheduler.service.mail;
+
+import java.util.Properties;
+
+import org.springframework.stereotype.Service;
+
+import com.google.auth.oauth2.AccessToken;
+import com.google.auth.oauth2.UserCredentials;
+
+import jakarta.mail.Message;
+import jakarta.mail.Session;
+import jakarta.mail.Transport;
+import jakarta.mail.internet.InternetAddress;
+import jakarta.mail.internet.MimeMessage;
+
+@Service
+public class MailService {
+    
+    private static final String CLIENT_ID="688417162908-iqvnj4ceb8t1dkbjr70dtcafo27m8kqe.apps.googleusercontent.com";
+    private static final String CLIENT_SECRET="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";
+    private static final String REFRESH_TOKEN="1//04_pSivNoGpPUCgYIARAAGAQSNwF-L9IrO0Kx6jSzq_eQNjdl65f0O2iqKSNpFeZ3gtIGMhOk0oiZsnKrPfWs8jvuEic1NhUoZ0g";
+    private static final String USER_MAIL="baekyangdan@gmail.com";
+
+    public void sendTestMail() throws Exception {
+        UserCredentials credentials = 
+        UserCredentials.newBuilder()
+            .setClientId(CLIENT_ID)
+            .setClientSecret(CLIENT_SECRET)
+            .setRefreshToken(REFRESH_TOKEN)
+            .build();
+
+        AccessToken accessToken = credentials.refreshAccessToken();
+        
+        Properties props = new Properties();
+        props.put("mail.smtp.auth", "true");
+        props.put("mail.smtp.starttls.enable", "true");
+        props.put("mail.smtp.host", "smtp.gmail.com");
+        props.put("mail.smtp.port", "587");
+        props.put("mail.smtp.auth.mechanisms", "XOAUTH2");
+
+        Session session = Session.getInstance(props);
+        Transport transport = session.getTransport("smtp");
+
+        transport.connect("smtp.gmail.com", USER_MAIL, accessToken.getTokenValue());
+
+        Message message = new MimeMessage(session);
+        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("lapinuit966@gmail.com"));
+        message.setSubject("test Mail");
+        message.setText("test mail");
+        message.setFrom(new InternetAddress(USER_MAIL));
+
+        transport.sendMessage(message, message.getAllRecipients());
+        transport.close();
+
+        System.out.println("메일 전송 완료");
+    }
+}

src/main/resources/application.properties

@@ -6,6 +6,10 @@ spring.mail.port=587
 spring.mail.username=baekyangdan@gmail.com
 spring.mail.protocol=smtp
 
+spring.mail.clientId=688417162908-iqvnj4ceb8t1dkbjr70dtcafo27m8kqe.apps.googleusercontent.com
+spring.mail.clientSecret=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
+spring.mail.refreshToken=1//04_pSivNoGpPUCgYIARAAGAQSNwF-L9IrO0Kx6jSzq_eQNjdl65f0O2iqKSNpFeZ3gtIGMhOk0oiZsnKrPfWs8jvuEic1NhUoZ0g
+
 spring.mail.properties.mail.smtp.auth=true
 spring.mail.properties.mail.smtp.starttls.enable=true
 spring.mail.properties.mail.smtp.starttls.required=true