[英]Find the Public IP of all my EC2 instances using Java?
I am trying to get the Public IP of all my Amazon Ec2 instances using the Java SDK. 我正在尝试使用Java SDK获得所有Amazon Ec2实例的公共IP。 I have been searching through the documentation and found that I need to use a DescribeInstanceRequest , DescribeInstanceResult and a Filter to achieve my purpose. 我一直在搜索文档 ,发现我需要使用DescribeInstanceRequest , DescribeInstanceResult和Filter来实现我的目的。
However, I do not understand how to complete the circle. 但是,我不知道如何完成圈子。 The DescribeInstanceResult does not seem to have what I need and I do not know how to effectively print the instance IPs that I want. DescribeInstanceResult似乎没有我需要的东西,我也不知道如何有效地打印所需的实例IP。
So far, this is my code: 到目前为止,这是我的代码:
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;
}
How do I complete it? 我该如何完成? What am I missing? 我想念什么?
The problem were the filters. 问题出在过滤器上。 Apparently using them is a bad decision and there is no point whatsoever in doing so. 显然,使用它们是一个错误的决定,这样做毫无意义。
Solution: 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;
}
The below codes just explain the idea and have not gone through the compiler. 下面的代码仅说明了这一思想,并未经过编译器。
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());
}
}
Refer the following code that fetches the public IP of instances. 请参考以下获取实例的公共IP的代码。
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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