是的，AWS Secret Manager可以通过JNDI从Tomcat访问。以下是一个使用JNDI访问AWS Secret Manager的示例代码：

1. 在Tomcat的context.xml文件中配置JNDI资源：

2. 在Tomcat的catalina.properties文件中添加以下配置：

org.apache.tomcat.util.digester.PROPERTY_SOURCE=com.amazonaws.secretsmanager.catalina.AwsSecretsManagerPropertySource

3. 在项目的pom.xml文件中添加以下依赖：

  
    software.amazon.awssdk
    secretsmanager
    2.16.25
  

4. 创建一个类来获取AWS Secret Manager中的密码：

import software.amazon.awssdk.auth.credentials.DefaultCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.secretsmanager.SecretsManagerClient;
import software.amazon.awssdk.services.secretsmanager.model.GetSecretValueRequest;
import software.amazon.awssdk.services.secretsmanager.model.GetSecretValueResponse;

import javax.naming.NamingException;
import javax.naming.Reference;
import javax.naming.StringRefAddr;

public class AwsSecretManagerPropertySource extends org.apache.tomcat.util.digester.PropertySource {

    private static final String SECRET_NAME = "my-secret-name";
    private static final String SECRET_KEY = "my-secret-key";

    @Override
    public Reference getPropertySource(Object obj, String propName, boolean ignorable) throws NamingException {
        if ("mysecretpassword".equals(propName)) {
            SecretsManagerClient client = SecretsManagerClient.builder()
                    .region(Region.US_EAST_1)
                    .credentialsProvider(DefaultCredentialsProvider.create())
                    .build();

            GetSecretValueRequest request = GetSecretValueRequest.builder()
                    .secretId(SECRET_NAME)
                    .build();

            GetSecretValueResponse response = client.getSecretValue(request);
            String password = response.secretString();

            Reference ref = new Reference(String.class.getName(), StringRefAddr.class.getName(), null);
            ref.add(new StringRefAddr("value", password));
            return ref;
        }

        return null;
    }
}

5. 将上述类编译为JAR文件，并将其放置在Tomcat的lib目录中。

完成上述步骤后，您可以通过以下方式在Tomcat中访问AWS Secret Manager中存储的密码：

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Main {
    public static void main(String[] args) throws Exception {
        Context ctx = new InitialContext();
        DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbc/mydatabase");

        try (Connection con = ds.getConnection();
             PreparedStatement ps = con.prepareStatement("SELECT * FROM users");
             ResultSet rs = ps.executeQuery()) {
            while (rs.next()) {
                // 处理结果集
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

这样，您就可以通过JNDI从Tomcat访问AWS Secret Manager中存储的密码了。