适用于 Java 的 AWS SDK 1.x于2025年 end-of-support 12月31日达到。我们建议您迁移到 [AWS SDK for Java 2.x](https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/home.html) 以继续获得新功能、可用性改进和安全更新。

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。

# 使用 CloudWatch 警报
<a name="examples-cloudwatch-create-alarms"></a>

## 创建警报
<a name="create-an-alarm"></a>

要根据 CloudWatch 指标创建警报，请使用已填充警报条件的 [PutMetricAlarmRequest](https://docs.aws.amazon.com/sdk-for-java/v1/reference/com/amazonaws/services/cloudwatch/model/PutMetricAlarmRequest.html) 调用 AmazonCloudWatchClient 的 `putMetricAlarm` 方法。

 **导入**。

```
import com.amazonaws.services.cloudwatch.AmazonCloudWatch;
import com.amazonaws.services.cloudwatch.AmazonCloudWatchClientBuilder;
import com.amazonaws.services.cloudwatch.model.ComparisonOperator;
import com.amazonaws.services.cloudwatch.model.Dimension;
import com.amazonaws.services.cloudwatch.model.PutMetricAlarmRequest;
import com.amazonaws.services.cloudwatch.model.PutMetricAlarmResult;
import com.amazonaws.services.cloudwatch.model.StandardUnit;
import com.amazonaws.services.cloudwatch.model.Statistic;
```

 **代码** 

```
final AmazonCloudWatch cw =
    AmazonCloudWatchClientBuilder.defaultClient();

Dimension dimension = new Dimension()
    .withName("InstanceId")
    .withValue(instanceId);

PutMetricAlarmRequest request = new PutMetricAlarmRequest()
    .withAlarmName(alarmName)
    .withComparisonOperator(
        ComparisonOperator.GreaterThanThreshold)
    .withEvaluationPeriods(1)
    .withMetricName("CPUUtilization")
    .withNamespace("{AWS}/EC2")
    .withPeriod(60)
    .withStatistic(Statistic.Average)
    .withThreshold(70.0)
    .withActionsEnabled(false)
    .withAlarmDescription(
        "Alarm when server CPU utilization exceeds 70%")
    .withUnit(StandardUnit.Seconds)
    .withDimensions(dimension);

PutMetricAlarmResult response = cw.putMetricAlarm(request);
```

## 列出警报
<a name="list-alarms"></a>

要列出您已创建的 CloudWatch 警报，请使用您可用来设置结果选项的 [DescribeAlarmsRequest](https://docs.aws.amazon.com/sdk-for-java/v1/reference/com/amazonaws/services/cloudwatch/model/DescribeAlarmsRequest.html) 调用 AmazonCloudWatchClient 的 `describeAlarms` 方法。

 **导入**。

```
import com.amazonaws.services.cloudwatch.AmazonCloudWatch;
import com.amazonaws.services.cloudwatch.AmazonCloudWatchClientBuilder;
import com.amazonaws.services.cloudwatch.model.DescribeAlarmsRequest;
import com.amazonaws.services.cloudwatch.model.DescribeAlarmsResult;
import com.amazonaws.services.cloudwatch.model.MetricAlarm;
```

 **代码** 

```
final AmazonCloudWatch cw =
    AmazonCloudWatchClientBuilder.defaultClient();

boolean done = false;
DescribeAlarmsRequest request = new DescribeAlarmsRequest();

while(!done) {

    DescribeAlarmsResult response = cw.describeAlarms(request);

    for(MetricAlarm alarm : response.getMetricAlarms()) {
        System.out.printf("Retrieved alarm %s", alarm.getAlarmName());
    }

    request.setNextToken(response.getNextToken());

    if(response.getNextToken() == null) {
        done = true;
    }
}
```

警报列表可以通过在 `describeAlarms` 返回的 [DescribeAlarmsResult](https://docs.aws.amazon.com/sdk-for-java/v1/reference/com/amazonaws/services/cloudwatch/model/DescribeAlarmsResult.html) 中调用 `getMetricAlarms` 获得。

结果可以*分页*。要检索下一批结果，请在原始请求对象中使用 `setNextToken` 对象的 `DescribeAlarmsResult` 方法的返回值调用 `getNextToken`，并将已修改的请求对象传回对 `describeAlarms` 的另一个调用。

**注意**  
您还可以使用 AmazonCloudWatchClient 的 `describeAlarmsForMetric` 方法检索特定指标的警报。它的使用类似于 `describeAlarms`。

## 删除警报
<a name="delete-alarms"></a>

要删除 CloudWatch 警报，请使用 [DeleteAlarmsRequest](https://docs.aws.amazon.com/sdk-for-java/v1/reference/com/amazonaws/services/cloudwatch/model/DeleteAlarmsRequest.html)（包含您要删除的一个或更多警报名称）调用 AmazonCloudWatchClient 的 `deleteAlarms` 方法。

 **导入**。

```
import com.amazonaws.services.cloudwatch.AmazonCloudWatch;
import com.amazonaws.services.cloudwatch.AmazonCloudWatchClientBuilder;
import com.amazonaws.services.cloudwatch.model.DeleteAlarmsRequest;
import com.amazonaws.services.cloudwatch.model.DeleteAlarmsResult;
```

 **代码** 

```
final AmazonCloudWatch cw =
    AmazonCloudWatchClientBuilder.defaultClient();

DeleteAlarmsRequest request = new DeleteAlarmsRequest()
    .withAlarmNames(alarm_name);

DeleteAlarmsResult response = cw.deleteAlarms(request);
```

## 更多信息
<a name="more-information"></a>
+  《Amazon CloudWatch 用户指南》中的[创建 Amazon CloudWatch 警报](https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/AlarmThatSendsEmail.html)
+  《Amazon CloudWatch API Reference》中的 [PutMetricAlarm](https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_PutMetricAlarm.html)
+  《Amazon CloudWatch API Reference》中的 [DescribeAlarms](https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_DescribeAlarms.html)
+  《Amazon CloudWatch API Reference》中的 [DeleteAlarms](https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_DeleteAlarms.html)