[英]Find the Public IP of all my EC2 instances using Java?
我正在嘗試使用Java SDK獲得所有Amazon Ec2實例的公共IP。 我一直在搜索文檔 ,發現我需要使用DescribeInstanceRequest , DescribeInstanceResult和Filter來實現我的目的。
但是,我不知道如何完成圈子。 DescribeInstanceResult似乎沒有我需要的東西,我也不知道如何有效地打印所需的實例IP。
到目前為止,這是我的代碼:
public List<String> getPublicIPs(){
DescribeInstancesRequest request = new DescribeInstancesRequest();
request.setInstanceIds(instanceIds);
List<Filter> filters = new LinkedList<Filter>();
filters.add(new Filter("ip-address"));
request.setFilters(filters);
DescribeInstancesResult result = ec2.describeInstances(request);
//what now!?
return null;
}
我該如何完成? 我想念什么?
問題出在過濾器上。 顯然,使用它們是一個錯誤的決定,這樣做毫無意義。
解:
/**
* Returns a list with the public IPs of all the active instances, which are
* returned by the {@link #getActiveInstances()} method.
*
* @return a list with the public IPs of all the active instances.
* @see #getActiveInstances()
* */
public List<String> getPublicIPs(){
List<String> publicIpsList = new LinkedList<String>();
//if there are no active instances, we return immediately to avoid extra
//computations.
if(!areAnyActive())
return publicIpsList;
DescribeInstancesRequest request = new DescribeInstancesRequest();
request.setInstanceIds(instanceIds);
DescribeInstancesResult result = ec2.describeInstances(request);
List<Reservation> reservations = result.getReservations();
List<Instance> instances;
for(Reservation res : reservations){
instances = res.getInstances();
for(Instance ins : instances){
LOG.info("PublicIP from " + ins.getImageId() + " is " + ins.getPublicIpAddress());
publicIpsList.add(ins.getPublicIpAddress());
}
}
return publicIpsList;
}
下面的代碼僅說明了這一思想,並未經過編譯器。
DescribeInstancesResult result= ec2.describeInstances(request);
List <Reservation> list = result.getReservations();
for (Reservation res:list) {
List <Instance> instanceList= res.getInstances();
for (Instance instance:instanceList){
System.out.println("Instance Public IP :" + instance.getPublicIpAddress());
}
}
請參考以下獲取實例的公共IP的代碼。
public void fetchInstancePublicIP(){
DescribeInstancesRequest request = new DescribeInstancesRequest().withInstanceIds(instanceIDs);
DescribeInstancesResult result= ec2.describeInstances(request);
List <Reservation> list = result.getReservations();
for (Reservation res:list) {
List <Instance> instanceList= res.getInstances();
for (Instance instance:instanceList){
System.out.println("Instance Public IP :" + instance.getPublicIpAddress());
System.out.println("Instance Public DNS :" + instance.getPublicDnsName());
System.out.println("Instance State :" + instance.getState());
System.out.println("Instance TAGS :" + instance.getTags());
}
}
}
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