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How can i get only index name from response generated from elasticsearch

How can i get only index name from response generated by calling _cat/indices using java. Using EntityUtils i am getting the response as string which gives me information in the way how it looks when called using CURL command. I am using rest low level client for fetching the response.
String responseBody = EntityUtils.toString(response.getEntity());
How should i process the responseBody to get only index name ?

ClusterStateResponse response = client.admin().cluster().prepareState().execute().actionGet();
String[] indices = response.getState().getMetaData().getConcreteAllIndices();
You will get the list of indices.

Java JSON Deserialization Error

I have the following code that uses Java JSON:
Widget w = new Widget(true, "LIVE");
WidgetService service = new WidgetServiceImpl(); // 3rd party JSON web service
JSONObject response = service.postWidget(w);
System.out.println("Response is: " + response.toString());
System.out.println("Now fetching orderid...");
System.out.println(response.getString("order_id"));
Don't worry about Widget or WidgetService: this question has to do with how I'm using the Java JSON API (and specifically JSONObject).
When I run the above code, I get:
Response is: {"response":{"credits_used":"0.30","job_count":1,"order_id":"243050","currency":"USD"},"opstat":"ok"}
Now fetching orderid...
Exception in thread "main" org.json.JSONException: JSONObject["order_id"] not found.
at org.json.JSONObject.get(JSONObject.java:473)
at org.json.JSONObject.getString(JSONObject.java:654)
at com.me.myapp.MyDriver.main(MyDriver.java:49)
As you can see, there is an order_id String field coming back in the response, and it has a value of "243050". So why am I getting the exception?

Your JSONObject response points to the outer json object.
I am pretty sure, your response object has a property "response" (and "opstat" btw.) containing your expected object.

You have to do it like this:
response.getJSONObject("response").getString("order_id");

Java - Check Response is JSON or not

I am creating a Server HealthCheck page. Most of the servers return JSONObject and I am able to easily parse it using:
String jsonText = readAll(br);
JSONObject json = new JSONObject(jsonText);
JSONObject resp = json.getJSONObject("Response");
Now my problem is the other servers that do not return JSON. Some are returning String, some pdf file some image and as all the responses are 200 OK I should return Positive healthcheck.
However I am using Future Threads and timing out my request after 4 secs. And all the servers which return anything other than JSON get stuck at " new JSONObject(jsonText);"
Is there any way I can check if the type of respone is JSON or not in Java?
Update:
I found my mistake - stupid one.
In the try catch block I am only catching IOException, which is not catching JSONException(and didnt show any error too - dunno y). I have added a new catch block for JSONException which works for my solution for now.
However, this isnt elegant solution, #Dave, #Radai and #Koi 's solutions is the right approach to go with.

Don't parse the string. Go back one step, and check the Content-Type header of the HTTP response. If the response contains JSON data, the Content-Type should be application/json (source).

Check the MediaType in the response using response.getMediaType(). If it is json it returns application/json.

This helped me;
if (response.getMediaType().isCompatible(MediaType.APPLICATION_JSON_TYPE)) {
System.out.println("The media type matches application/json");
} else {
System.out.println("The media type does not match application/json");
}

Can't read blogger post content using GData API

I need to read the content of some posts i'm retrieving from a blogger feed.
This code retrieves the first available post from the blogger feed
URL postsFeedUrl = new URL("http://www.blogger.com/feeds/" + blogId + "/posts/default");
Query postsQuery = new Query(postsFeedUrl);
Feed resultFeed = myService.getFeed(postsQuery, Feed.class);
Entry e = resultFeed.getEntries().get(i);
The problem is: how to get the post content?
If i use
e.getContent();
i get a Content object from which i don't know how to extract the real post content.
If i use
e.getPlainTextContent();
It results in
Exception in thread "main" java.lang.IllegalStateException: TextConstruct object is not a PlainTextConstruct
at com.google.gdata.data.BaseEntry.getPlainTextContent(BaseEntry.java:358)
at BloggerFeed.printAllPosts(BloggerFeed.java:49)
at BloggerFeed.main(BloggerFeed.java:28)
How can i retrieve the post content with the GData API?

You need to add param fetchBodies=true.

Getting JSON object from a URL

I'm writing an application using the public Tumblr API, just for fun. I have set up my oauth keys, and I have the URL for accessing my blog's info. I was wondering how I could take the JSON-encoded data from that page and turn it into Strings for working with.
To be clear, if I wanted a blog's title, I could send a request to this URL and select the data for the title.
Thanks!

I've used Restlet for retrieving JSON data from a rest service. Below is the sample
Representation entity = new ClientResource("your url").get();
JsonRepresentation jsonRepresentation = new JsonRepresentation(entity.getText());
JSONObject jsonObject = jsonRepresentation.getJsonObject();