截至 2024 年 7 月 31 日， AWS SDK for Java 1.x 已進入維護模式，並將end-of-support在 2025 年 12 月 31 日送達。我們建議您遷移至 AWS SDK for Java 2.x，以繼續接收新功能、可用性改進和安全性更新。

本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

使用 CloudWatch 警報

建立警示

若要根據 CloudWatch 指標，請調用卓越亞馬遜關注客户端的putMetricAlarm方法並搭配PutMetricAlarmRequest充滿了報警條件。

匯入

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;

Code

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);

列出警示

若要列出 CloudWatch 警示，請呼叫卓越亞馬遜 CloudWatch 客户端的describeAlarms方法並搭配DescribeAlarmsRequest，您可以使用它來設置結果的選項。

匯入

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;

Code

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;
    }
}

警示清單可以通過呼叫getMetricAlarms在DescribeAlarmsResult，會傳回describeAlarms。

結果可能會分頁。若要檢索下一批次的結果，請呼叫setNextToken在原始請求對象上，返回值為DescribeAlarmsResult物件的getNextToken方法，並將修改的請求物件傳回另一個describeAlarms。

刪除警示

要刪除 CloudWatch 警報，請調用卓越亞馬遜關注客户端的deleteAlarms方法並搭配DeleteAlarmsRequest，其包含一個或多個您所要刪除警示的名稱。

匯入

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;

Code

final AmazonCloudWatch cw =
    AmazonCloudWatchClientBuilder.defaultClient();

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

DeleteAlarmsResult response = cw.deleteAlarms(request);

詳細資訊