使用适用于 Java 2.x 的 SDK 的自动扩展示例

以下代码示例向您展示了如何使用与 Auto Scaling AWS SDK for Java 2.x 一起执行操作和实现常见场景。

操作是大型程序的代码摘录，必须在上下文中运行。虽然操作向您展示了如何调用单个服务函数，但您可以在其相关场景和跨服务示例中查看操作的上下文。

场景是展示如何通过在同一服务中调用多个函数来完成特定任务的代码示例。

每个示例都包含一个链接GitHub，您可以在其中找到有关如何在上下文中设置和运行代码的说明。

主题

操作
场景

操作

以下代码示例显示了如何创建 Auto Scaling 组。

SDK for Java 2.x

注意

还有更多GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。


    public static void createAutoScalingGroup(AutoScalingClient autoScalingClient,
                                              String groupName,
                                              String launchTemplateName,
                                              String vpcZoneId) {

        try {
            AutoScalingWaiter waiter = autoScalingClient.waiter();
            LaunchTemplateSpecification templateSpecification = LaunchTemplateSpecification.builder()
                .launchTemplateName(launchTemplateName)
                .build();

            CreateAutoScalingGroupRequest request = CreateAutoScalingGroupRequest.builder()
                .autoScalingGroupName(groupName)
                .availabilityZones("us-east-1a")
                .launchTemplate(templateSpecification)
                .maxSize(1)
                .minSize(1)
                .vpcZoneIdentifier(vpcZoneId)
                .build();

            autoScalingClient.createAutoScalingGroup(request);
            DescribeAutoScalingGroupsRequest groupsRequest = DescribeAutoScalingGroupsRequest.builder()
                .autoScalingGroupNames(groupName)
                .build();

            WaiterResponse<DescribeAutoScalingGroupsResponse> waiterResponse = waiter.waitUntilGroupExists(groupsRequest);
            waiterResponse.matched().response().ifPresent(System.out::println);
            System.out.println("Auto Scaling Group created");

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

有关 API 的详细信息，请参阅 CreateAutoScalingGroupAWS SDK for Java 2.xAPI 参考文档。

以下代码示例显示了如何删除 Auto Scaling 组。

SDK for Java 2.x

注意

还有更多GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。


    public static void deleteAutoScalingGroup(AutoScalingClient autoScalingClient, String groupName) {
        try {
            DeleteAutoScalingGroupRequest deleteAutoScalingGroupRequest = DeleteAutoScalingGroupRequest.builder()
                .autoScalingGroupName(groupName)
                .forceDelete(true)
                .build() ;

            autoScalingClient.deleteAutoScalingGroup(deleteAutoScalingGroupRequest) ;
            System.out.println("You successfully deleted "+groupName);

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

有关 API 的详细信息，请参阅 DeleteAutoScalingGroupAWS SDK for Java 2.xAPI 参考文档。

以下代码示例显示如何禁用 Auto Scaling 组的CloudWatch指标收集。

SDK for Java 2.x

注意

还有更多GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。


    public static void disableMetricsCollection(AutoScalingClient autoScalingClient, String groupName) {
        try {
            DisableMetricsCollectionRequest disableMetricsCollectionRequest = DisableMetricsCollectionRequest.builder()
                .autoScalingGroupName(groupName)
                .metrics("GroupMaxSize")
                .build();

            autoScalingClient.disableMetricsCollection(disableMetricsCollectionRequest);
            System.out.println("The disable metrics collection operation was successful");

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

有关 API 的详细信息，请参阅 DisableMetricsCollectionAWS SDK for Java 2.xAPI 参考文档。

以下代码示例显示如何为 Auto Scaling 组启用CloudWatch指标收集。

SDK for Java 2.x

注意

还有更多GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。


    public static void enableMetricsCollection(AutoScalingClient autoScalingClient, String groupName) {
        try {
            EnableMetricsCollectionRequest collectionRequest = EnableMetricsCollectionRequest.builder()
                .autoScalingGroupName(groupName)
                .metrics("GroupMaxSize")
                .granularity("1Minute")
                .build();

            autoScalingClient.enableMetricsCollection(collectionRequest);
            System.out.println("The enable metrics collection operation was successful");

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

有关 API 的详细信息，请参阅 EnableMetricsCollectionAWS SDK for Java 2.xAPI 参考文档。

以下代码示例显示了如何获取有关 Auto Scaling 组的信息。

SDK for Java 2.x

注意

还有更多GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。


    public static String getAutoScaling( AutoScalingClient autoScalingClient, String groupName) {
        try{
            String instanceId = "";
            DescribeAutoScalingGroupsRequest scalingGroupsRequest = DescribeAutoScalingGroupsRequest.builder()
                .autoScalingGroupNames(groupName)
                .build();

            DescribeAutoScalingGroupsResponse response = autoScalingClient.describeAutoScalingGroups(scalingGroupsRequest);
            List<AutoScalingGroup> groups = response.autoScalingGroups();
            for (AutoScalingGroup group: groups) {
                System.out.println("The group name is " + group.autoScalingGroupName());
                System.out.println("The group ARN is " + group.autoScalingGroupARN());

                List<Instance> instances = group.instances();
                for (Instance instance : instances) {
                    instanceId = instance.instanceId();
                }
            }
            return instanceId;
        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
        return "";
    }

有关 API 的详细信息，请参阅 DescribeAutoScalingGroupsAWS SDK for Java 2.xAPI 参考文档。

以下代码示例显示了如何获取有关 Auto Scaling 实例的信息。

SDK for Java 2.x

注意

还有更多GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。


    public static void describeAutoScalingInstance( AutoScalingClient autoScalingClient, String id) {
        try {
            DescribeAutoScalingInstancesRequest describeAutoScalingInstancesRequest = DescribeAutoScalingInstancesRequest.builder()
                .instanceIds(id)
                .build();

            DescribeAutoScalingInstancesResponse response = autoScalingClient.describeAutoScalingInstances(describeAutoScalingInstancesRequest);
            List<AutoScalingInstanceDetails> instances = response.autoScalingInstances();
            for (AutoScalingInstanceDetails instance:instances ) {
                System.out.println("The instance lifecycle state is: "+instance.lifecycleState());
            }

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

有关 API 的详细信息，请参阅 DescribeAutoScalingInstancesAWS SDK for Java 2.xAPI 参考文档。

以下代码示例显示了如何获取有关 Auto Scaling 活动的信息。

SDK for Java 2.x

注意

还有更多GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。


    public static void describeScalingActivities(AutoScalingClient autoScalingClient, String groupName) {
        try {
            DescribeScalingActivitiesRequest scalingActivitiesRequest = DescribeScalingActivitiesRequest.builder()
                .autoScalingGroupName(groupName)
                .maxRecords(10)
                .build();

            DescribeScalingActivitiesResponse response = autoScalingClient.describeScalingActivities(scalingActivitiesRequest);
            List<Activity> activities = response.activities();
            for (Activity activity: activities) {
                System.out.println("The activity Id is "+activity.activityId());
                System.out.println("The activity details are "+activity.details());
            }

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

有关 API 的详细信息，请参阅 DescribeScalingActivitiesAWS SDK for Java 2.xAPI 参考文档。

以下代码示例显示如何设置 Auto Scaling 组的所需容量。

SDK for Java 2.x

注意

还有更多GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。


    public static void setDesiredCapacity(AutoScalingClient autoScalingClient, String groupName) {
        try {
            SetDesiredCapacityRequest capacityRequest = SetDesiredCapacityRequest.builder()
                .autoScalingGroupName(groupName)
                .desiredCapacity(2)
                .build();

            autoScalingClient.setDesiredCapacity(capacityRequest);
            System.out.println("You have set the DesiredCapacity to 2");

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

有关 API 的详细信息，请参阅 SetDesiredCapacityAWS SDK for Java 2.xAPI 参考文档。

以下代码示例显示如何终止 Auto Scaling 组中的实例。

SDK for Java 2.x

注意

还有更多GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。


    public static void terminateInstanceInAutoScalingGroup(AutoScalingClient autoScalingClient, String instanceId){
        try {
            TerminateInstanceInAutoScalingGroupRequest request = TerminateInstanceInAutoScalingGroupRequest.builder()
                .instanceId(instanceId)
                .shouldDecrementDesiredCapacity(false)
                .build();

            autoScalingClient.terminateInstanceInAutoScalingGroup(request);
            System.out.println("You have terminated instance "+instanceId);

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

有关 API 的详细信息，请参阅 TerminateInstanceInAutoScalingGroupAWS SDK for Java 2.xAPI 参考文档。

以下代码示例显示如何更新 Auto Scaling 组的配置。

SDK for Java 2.x

注意

还有更多GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。


    public static void updateAutoScalingGroup(AutoScalingClient autoScalingClient, String groupName, String launchTemplateName) {
        try {
            AutoScalingWaiter waiter = autoScalingClient.waiter();
            LaunchTemplateSpecification templateSpecification = LaunchTemplateSpecification.builder()
                .launchTemplateName(launchTemplateName)
                .build();

            UpdateAutoScalingGroupRequest groupRequest = UpdateAutoScalingGroupRequest.builder()
                .maxSize(3)
                .autoScalingGroupName(groupName)
                .launchTemplate(templateSpecification)
                .build();

            autoScalingClient.updateAutoScalingGroup(groupRequest);
            DescribeAutoScalingGroupsRequest groupsRequest = DescribeAutoScalingGroupsRequest.builder()
                .autoScalingGroupNames(groupName)
                .build();

            WaiterResponse<DescribeAutoScalingGroupsResponse> waiterResponse = waiter.waitUntilGroupInService(groupsRequest);
            waiterResponse.matched().response().ifPresent(System.out::println);
            System.out.println("You successfully updated the auto scaling group  "+groupName);

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

有关 API 的详细信息，请参阅 UpdateAutoScalingGroupAWS SDK for Java 2.xAPI 参考文档。

场景

以下代码示例显示了如何：

使用启动模板和可用区创建 Amazon EC2 Auto Scaling 组，并获取有关正在运行的实例的信息。
启用亚马逊CloudWatch指标收集。
更新组的所需容量并等待实例启动。
终止组中的实例。
列出为响应用户请求和容量变化而发生的扩展活动。
获取CloudWatch指标的统计数据，然后清理资源。

SDK for Java 2.x

注意

还有更多GitHub。查找完整示例，学习如何在 AWS 代码示例存储库中进行设置和运行。


/**
 *  Before running this SDK for Java (v2) code example, set up your development environment, including your credentials.
 *
 *  For more information, see the following documentation:
 *
 *  https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
 *
 *  In addition, create a launch template. For more information, see the following topic:
 *
 *  https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-launch-templates.html#create-launch-template
 *
 * This code example performs the following operations:
 * 1. Creates an Auto Scaling group using an AutoScalingWaiter.
 * 2. Gets a specific Auto Scaling group and returns an instance Id value.
 * 3. Describes Auto Scaling with the Id value.
 * 4. Enables metrics collection.
 * 5. Update an Auto Scaling group.
 * 6. Describes Account details.
 * 7. Describe account details"
 * 8. Updates an Auto Scaling group to use an additional instance.
 * 9. Gets the specific Auto Scaling group and gets the number of instances.
 * 10. List the scaling activities that have occurred for the group.
 * 11. Terminates an instance in the Auto Scaling group.
 * 12. Stops the metrics collection.
 * 13. Deletes the Auto Scaling group.
 */

public class AutoScalingScenario {
    public static final String DASHES = new String(new char[80]).replace("\0", "-");
    public static void main(String[] args) throws InterruptedException {
        final String usage = "\n" +
            "Usage:\n" +
            "    <groupName> <launchTemplateName> <vpcZoneId>\n\n" +
            "Where:\n" +
            "    groupName - The name of the Auto Scaling group.\n" +
            "    launchTemplateName - The name of the launch template. \n" +
            "    vpcZoneId - A subnet Id for a virtual private cloud (VPC) where instances in the Auto Scaling group can be created.\n" ;

        if (args.length != 3) {
            System.out.println(usage);
            System.exit(1);
        }

        String groupName = args[0];
        String launchTemplateName = args[1];
        String vpcZoneId = args[2];
        AutoScalingClient autoScalingClient = AutoScalingClient.builder()
            .region(Region.US_EAST_1)
            .credentialsProvider(ProfileCredentialsProvider.create())
            .build();

        System.out.println(DASHES);
        System.out.println("Welcome to the Amazon EC2 Auto Scaling example scenario.");
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("1. Create an Auto Scaling group named "+groupName);
        createAutoScalingGroup(autoScalingClient, groupName, launchTemplateName, vpcZoneId);
        System.out.println("Wait 1 min for the resources, including the instance. Otherwise, an empty instance Id is returned");
        Thread.sleep(60000);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("2. Get Auto Scale group Id value");
        String instanceId = getSpecificAutoScalingGroups(autoScalingClient, groupName);
        if (instanceId.compareTo("") ==0) {
            System.out.println("Error - no instance Id value");
            System.exit(1);
        } else {
            System.out.println("The instance Id value is "+instanceId);
        }
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("3. Describe Auto Scaling with the Id value "+instanceId);
        describeAutoScalingInstance( autoScalingClient, instanceId);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("4. Enable metrics collection "+instanceId);
        enableMetricsCollection(autoScalingClient, groupName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("5. Update an Auto Scaling group to update max size to 3");
        updateAutoScalingGroup(autoScalingClient, groupName, launchTemplateName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("6. Describe Auto Scaling groups");
        describeAutoScalingGroups(autoScalingClient, groupName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("7. Describe account details");
        describeAccountLimits(autoScalingClient);
        System.out.println("Wait 1 min for the resources, including the instance. Otherwise, an empty instance Id is returned");
        Thread.sleep(60000);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("8. Set desired capacity to 2");
        setDesiredCapacity(autoScalingClient, groupName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("9. Get the two instance Id values and state");
        getSpecificAutoScalingGroups(autoScalingClient, groupName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("10. List the scaling activities that have occurred for the group");
        describeScalingActivities(autoScalingClient, groupName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("11. Terminate an instance in the Auto Scaling group");
        terminateInstanceInAutoScalingGroup(autoScalingClient, instanceId);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("12. Stop the metrics collection");
        disableMetricsCollection(autoScalingClient, groupName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("13. Delete the Auto Scaling group");
        deleteAutoScalingGroup(autoScalingClient, groupName);
        System.out.println(DASHES);

        System.out.println(DASHES);
        System.out.println("The Scenario has successfully completed." );
        System.out.println(DASHES);

        autoScalingClient.close();
    }

    public static void describeScalingActivities(AutoScalingClient autoScalingClient, String groupName) {
        try {
            DescribeScalingActivitiesRequest scalingActivitiesRequest = DescribeScalingActivitiesRequest.builder()
                .autoScalingGroupName(groupName)
                .maxRecords(10)
                .build();

            DescribeScalingActivitiesResponse response = autoScalingClient.describeScalingActivities(scalingActivitiesRequest);
            List<Activity> activities = response.activities();
            for (Activity activity: activities) {
                System.out.println("The activity Id is "+activity.activityId());
                System.out.println("The activity details are "+activity.details());
            }

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void setDesiredCapacity(AutoScalingClient autoScalingClient, String groupName) {
        try {
            SetDesiredCapacityRequest capacityRequest = SetDesiredCapacityRequest.builder()
                .autoScalingGroupName(groupName)
                .desiredCapacity(2)
                .build();

            autoScalingClient.setDesiredCapacity(capacityRequest);
            System.out.println("You have set the DesiredCapacity to 2");

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void createAutoScalingGroup(AutoScalingClient autoScalingClient,
                                              String groupName,
                                              String launchTemplateName,
                                              String vpcZoneId) {
        try {
            AutoScalingWaiter waiter = autoScalingClient.waiter();
            LaunchTemplateSpecification templateSpecification = LaunchTemplateSpecification.builder()
                .launchTemplateName(launchTemplateName)
                .build();

            CreateAutoScalingGroupRequest request = CreateAutoScalingGroupRequest.builder()
                .autoScalingGroupName(groupName)
                .availabilityZones("us-east-1a")
                .launchTemplate(templateSpecification)
                .maxSize(1)
                .minSize(1)
                .vpcZoneIdentifier(vpcZoneId)
                .build();

            autoScalingClient.createAutoScalingGroup(request);
            DescribeAutoScalingGroupsRequest groupsRequest = DescribeAutoScalingGroupsRequest.builder()
                .autoScalingGroupNames(groupName)
                .build();

            WaiterResponse<DescribeAutoScalingGroupsResponse> waiterResponse = waiter.waitUntilGroupExists(groupsRequest);
            waiterResponse.matched().response().ifPresent(System.out::println);
            System.out.println("Auto Scaling Group created");

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void describeAutoScalingInstance( AutoScalingClient autoScalingClient, String id) {
        try {
            DescribeAutoScalingInstancesRequest describeAutoScalingInstancesRequest = DescribeAutoScalingInstancesRequest.builder()
                .instanceIds(id)
                .build();

            DescribeAutoScalingInstancesResponse response = autoScalingClient.describeAutoScalingInstances(describeAutoScalingInstancesRequest);
            List<AutoScalingInstanceDetails> instances = response.autoScalingInstances();
            for (AutoScalingInstanceDetails instance:instances ) {
                System.out.println("The instance lifecycle state is: "+instance.lifecycleState());
            }

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void describeAutoScalingGroups(AutoScalingClient autoScalingClient, String groupName) {
        try {
            DescribeAutoScalingGroupsRequest groupsRequest = DescribeAutoScalingGroupsRequest.builder()
                .autoScalingGroupNames(groupName)
                .maxRecords(10)
                .build();

            DescribeAutoScalingGroupsResponse response = autoScalingClient.describeAutoScalingGroups(groupsRequest);
            List<AutoScalingGroup> groups = response.autoScalingGroups();
            for (AutoScalingGroup group: groups) {
                System.out.println("*** The service to use for the health checks: "+ group.healthCheckType());
            }

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static String getSpecificAutoScalingGroups(AutoScalingClient autoScalingClient, String groupName) {
        try{
            String instanceId = "";
            DescribeAutoScalingGroupsRequest scalingGroupsRequest = DescribeAutoScalingGroupsRequest.builder()
                .autoScalingGroupNames(groupName)
                .build();

            DescribeAutoScalingGroupsResponse response = autoScalingClient.describeAutoScalingGroups(scalingGroupsRequest);
            List<AutoScalingGroup> groups = response.autoScalingGroups();
            for (AutoScalingGroup group: groups) {
                System.out.println("The group name is " + group.autoScalingGroupName());
                System.out.println("The group ARN is " + group.autoScalingGroupARN());
                List<Instance> instances = group.instances();

                for (Instance instance : instances) {
                    instanceId = instance.instanceId();
                    System.out.println("The instance id is " + instanceId);
                    System.out.println("The lifecycle state is " +instance.lifecycleState());
                }
            }

            return instanceId ;
        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
        return "" ;
    }

    public static void enableMetricsCollection(AutoScalingClient autoScalingClient, String groupName) {
        try {
            EnableMetricsCollectionRequest collectionRequest = EnableMetricsCollectionRequest.builder()
                .autoScalingGroupName(groupName)
                .metrics("GroupMaxSize")
                .granularity("1Minute")
                .build();

            autoScalingClient.enableMetricsCollection(collectionRequest);
            System.out.println("The enable metrics collection operation was successful");

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void disableMetricsCollection(AutoScalingClient autoScalingClient, String groupName) {
        try {
            DisableMetricsCollectionRequest disableMetricsCollectionRequest = DisableMetricsCollectionRequest.builder()
                .autoScalingGroupName(groupName)
                .metrics("GroupMaxSize")
                .build();

            autoScalingClient.disableMetricsCollection(disableMetricsCollectionRequest);
            System.out.println("The disable metrics collection operation was successful");

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void describeAccountLimits(AutoScalingClient autoScalingClient) {
        try {
            DescribeAccountLimitsResponse response = autoScalingClient.describeAccountLimits();
            System.out.println("The max number of auto scaling groups is "+response.maxNumberOfAutoScalingGroups());
            System.out.println("The current number of auto scaling groups is "+response.numberOfAutoScalingGroups());

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void updateAutoScalingGroup(AutoScalingClient autoScalingClient, String groupName, String launchTemplateName) {
        try {
            AutoScalingWaiter waiter = autoScalingClient.waiter();
            LaunchTemplateSpecification templateSpecification = LaunchTemplateSpecification.builder()
                .launchTemplateName(launchTemplateName)
                .build();

            UpdateAutoScalingGroupRequest groupRequest = UpdateAutoScalingGroupRequest.builder()
                .maxSize(3)
                .autoScalingGroupName(groupName)
                .launchTemplate(templateSpecification)
                .build();

            autoScalingClient.updateAutoScalingGroup(groupRequest);
            DescribeAutoScalingGroupsRequest groupsRequest = DescribeAutoScalingGroupsRequest.builder()
                .autoScalingGroupNames(groupName)
                .build();

            WaiterResponse<DescribeAutoScalingGroupsResponse> waiterResponse = waiter.waitUntilGroupInService(groupsRequest);
            waiterResponse.matched().response().ifPresent(System.out::println);
            System.out.println("You successfully updated the auto scaling group  "+groupName);

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void terminateInstanceInAutoScalingGroup(AutoScalingClient autoScalingClient, String instanceId){
        try {
            TerminateInstanceInAutoScalingGroupRequest request = TerminateInstanceInAutoScalingGroupRequest.builder()
                .instanceId(instanceId)
                .shouldDecrementDesiredCapacity(false)
                .build();

            autoScalingClient.terminateInstanceInAutoScalingGroup(request);
            System.out.println("You have terminated instance "+instanceId);

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

    public static void deleteAutoScalingGroup(AutoScalingClient autoScalingClient, String groupName) {
        try {
            DeleteAutoScalingGroupRequest deleteAutoScalingGroupRequest = DeleteAutoScalingGroupRequest.builder()
                .autoScalingGroupName(groupName)
                .forceDelete(true)
                .build() ;

            autoScalingClient.deleteAutoScalingGroup(deleteAutoScalingGroupRequest) ;
            System.out.println("You successfully deleted "+groupName);

        } catch (AutoScalingException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }
}

有关 API 详细信息，请参阅《AWS SDK for Java 2.x API 参考》中的以下主题。

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