Java（AWS SDK v2）中的 DynamoDB GetItem

import java.util.HashMap;
import java.util.Map;

import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.dynamodb.DynamoDbClient;
import software.amazon.awssdk.services.dynamodb.model.AttributeValue;
import software.amazon.awssdk.services.dynamodb.model.DynamoDbException;
import software.amazon.awssdk.services.dynamodb.model.GetItemRequest;

public class GetItemExample {
    public static void main(String[] args) {
        try (DynamoDbClient ddb = DynamoDbClient.builder()
                .region(Region.US_EAST_1)
                .build()) {

            Map<String, AttributeValue> key = new HashMap<>();
            key.put("Artist", AttributeValue.builder().s("Arturo Sandoval").build());
            key.put("SongTitle", AttributeValue.builder().s("Cubano Chant").build());

            Map<String, String> names = new HashMap<>();
            names.put("#proj0", "Artist");
            names.put("#proj1", "SongTitle");
            names.put("#proj2", "AlbumTitle");
            names.put("#proj3", "Year");

            GetItemRequest request = GetItemRequest.builder()
                    .tableName("Music")
                    .key(key)
                    .projectionExpression("#proj0, #proj1, #proj2, #proj3")
                    .expressionAttributeNames(names)
                    .build();

            Map<String, AttributeValue> item = ddb.getItem(request).item();
            if (item.isEmpty()) {
                System.out.println("Item not found");
            } else {
                System.out.println(item);
            }
        } catch (DynamoDbException e) {
            System.err.println(e.getMessage());
        }
    }
}