文档 AWS SDK 示例 GitHub 存储库中还有更多 [S AWS DK 示例](https://github.com/awsdocs/aws-doc-sdk-examples)。

本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。

# 开始使用 Elastic Load Balancing
<a name="elastic-load-balancing-v2_example_elastic-load-balancing-v2_Hello_section"></a>

以下代码示例演示了如何开始使用 Elastic Load Balancing。

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#### [ Java ]

**适用于 Java 的 SDK 2.x**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/usecases/resilient_service#code-examples)中查找完整示例，了解如何进行设置和运行。

```
public class HelloLoadBalancer {

        public static void main(String[] args) {
                ElasticLoadBalancingV2Client loadBalancingV2Client = ElasticLoadBalancingV2Client.builder()
                                .region(Region.US_EAST_1)
                                .build();

                DescribeLoadBalancersResponse loadBalancersResponse = loadBalancingV2Client
                                .describeLoadBalancers(r -> r.pageSize(10));
                List<LoadBalancer> loadBalancerList = loadBalancersResponse.loadBalancers();
                for (LoadBalancer lb : loadBalancerList)
                        System.out.println("Load Balancer DNS name = " + lb.dnsName());
        }
}
```
+  有关 API 的详细信息，请参阅 *AWS SDK for Java 2.x API 参考[DescribeLoadBalancers](https://docs.aws.amazon.com/goto/SdkForJavaV2/elasticloadbalancingv2-2015-12-01/DescribeLoadBalancers)*中的。

------
#### [ JavaScript ]

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/elastic-load-balancing-v2#code-examples)中查找完整示例，了解如何进行设置和运行。

```
import {
  ElasticLoadBalancingV2Client,
  DescribeLoadBalancersCommand,
} from "@aws-sdk/client-elastic-load-balancing-v2";

export async function main() {
  const client = new ElasticLoadBalancingV2Client({});
  const { LoadBalancers } = await client.send(
    new DescribeLoadBalancersCommand({}),
  );
  const loadBalancersList = LoadBalancers.map(
    (lb) => `• ${lb.LoadBalancerName}: ${lb.DNSName}`,
  ).join("\n");
  console.log(
    "Hello, Elastic Load Balancing! Let's list some of your load balancers:\n",
    loadBalancersList,
  );
}

// Call function if run directly
import { fileURLToPath } from "node:url";
if (process.argv[1] === fileURLToPath(import.meta.url)) {
  main();
}
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[DescribeLoadBalancers](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/elastic-load-balancing-v2/command/DescribeLoadBalancersCommand)*中的。

------
#### [ Python ]

**适用于 Python 的 SDK（Boto3）**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/python/example_code/elastic-load-balancing#code-examples)中查找完整示例，了解如何进行设置和运行。

```
import boto3


def hello_elbv2(elbv2_client):
    """
    Use the AWS SDK for Python (Boto3) to create an Elastic Load Balancing V2 client and list
    up to ten of the load balancers for your account.
    This example uses the default settings specified in your shared credentials
    and config files.

    :param elbv2_client: A Boto3 Elastic Load Balancing V2 client object.
    """
    print("Hello, Elastic Load Balancing! Let's list some of your load balancers:")
    load_balancers = elbv2_client.describe_load_balancers(PageSize=10).get(
        "LoadBalancers", []
    )
    if load_balancers:
        for lb in load_balancers:
            print(f"\t{lb['LoadBalancerName']}: {lb['DNSName']}")
    else:
        print("Your account doesn't have any load balancers.")


if __name__ == "__main__":
    hello_elbv2(boto3.client("elbv2"))
```
+  有关 API 的详细信息，请参阅适用[DescribeLoadBalancers](https://docs.aws.amazon.com/goto/boto3/elasticloadbalancingv2-2015-12-01/DescribeLoadBalancers)于 *Python 的AWS SDK (Boto3) API 参考*。

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