要在Amazon SES中发送电子邮件到Gmail地址，您需要确保您的电子邮件设置正确，并且您的Amazon SES帐户已经通过了Gmail的电子邮件身份验证。

下面是一个使用AWS SDK for Java发送电子邮件到Gmail地址的代码示例：

import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.simpleemail.AmazonSimpleEmailService;
import com.amazonaws.services.simpleemail.AmazonSimpleEmailServiceClientBuilder;
import com.amazonaws.services.simpleemail.model.RawMessage;
import com.amazonaws.services.simpleemail.model.SendRawEmailRequest;
import com.amazonaws.services.simpleemail.model.SendRawEmailResult;

import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeBodyPart;
import javax.mail.util.ByteArrayDataSource;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Properties;

public class SendEmailToGmail {

    public static void main(String[] args) throws MessagingException, IOException {
        String accessKey = "YOUR_ACCESS_KEY";
        String secretKey = "YOUR_SECRET_KEY";

        // 创建AWS凭证对象
        BasicAWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);

        // 创建Amazon SES客户端
        AmazonSimpleEmailService client = AmazonSimpleEmailServiceClientBuilder.standard()
                .withCredentials(new AWSStaticCredentialsProvider(credentials))
                .withRegion(Regions.US_EAST_1)
                .build();

        // 创建邮件会话
        Session session = Session.getDefaultInstance(new Properties());

        // 创建MimeMessage对象
        MimeMessage mimeMessage = new MimeMessage(session);

        // 设置发件人和收件人
        mimeMessage.setFrom(new InternetAddress("SENDER_EMAIL_ADDRESS"));
        mimeMessage.setRecipient(javax.mail.Message.RecipientType.TO, new InternetAddress("RECIPIENT_EMAIL_ADDRESS"));

        // 设置邮件主题
        mimeMessage.setSubject("Test Email");

        // 创建邮件内容
        MimeBodyPart messageBodyPart = new MimeBodyPart();
        messageBodyPart.setContent("This is a test email", "text/plain");

        // 创建包含邮件内容的Multipart对象
        MimeMultipart multipart = new MimeMultipart();
        multipart.addBodyPart(messageBodyPart);

        // 将Multipart对象设置为邮件内容
        mimeMessage.setContent(multipart);

        // 将MimeMessage对象转换为字节数组
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        mimeMessage.writeTo(outputStream);
        byte[] rawMessageBytes = outputStream.toByteArray();

        // 创建RawMessage对象
        RawMessage rawMessage = new RawMessage(ByteBuffer.wrap(rawMessageBytes));

        // 创建发送邮件请求
        SendRawEmailRequest rawEmailRequest = new SendRawEmailRequest(rawMessage);

        // 发送邮件
        SendRawEmailResult result = client.sendRawEmail(rawEmailRequest);
        System.out.println("Email sent!");
    }
}

请确保将代码示例中的以下值替换为您自己的值：

• YOUR_ACCESS_KEY：您的AWS访问密钥ID。
• YOUR_SECRET_KEY：您的AWS秘密访问密钥。
• SENDER_EMAIL_ADDRESS：要发送电子邮件的发件人电子邮件地址。
• RECIPIENT_EMAIL_ADDRESS：要发送电子邮件的收件人电子邮件地址。

此代码示例将通过Amazon SES发送一封包含简单文本内容的电子邮件到指定的Gmail地址。