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How can I send JSON data to Logstash

I know there is a Logstash http input plugin.
I am wondering if it is possible to send JSON message to Logstash using Java.
I do something like this:
HttpClient httpClient = HttpClientBuilder.create().build();
try {
HttpPost request = new HttpPost("host_name:port/index_name/type_name");
StringEntity params = new StringEntity("{\"message\": {\"fieldName\":\"value\"}}");
request.addHeader("content-type", "application/json");
request.setEntity(params);
HttpResponse response = httpClient.execute(request);
} catch (Exception ex) {
}
}
but data is not sent to Logstash.
Could anybody recommend the correct way to do that?

Java JSON Apache POST Parameters

So I've got this code:
HttpClient httpClient = new DefaultHttpClient();
try {
HttpPost request = new HttpPost("url");
StringEntity params = new StringEntity("stuff");
request.addHeader("content-type", "application/json");
//request.addHeader("Accept","application/json");
request.setEntity(params);
HttpResponse response = httpClient.execute(request);
//stuff
} catch (Exception ex) {
//stuff
} finally {
httpClient.getConnectionManager().shutdown();
}
I need to create a POST request which I can do with curl -X POST /groups/:group_id/members/add etc but I'm not sure how to add the /groups/ param to my code... I'm not super familiar with how to do this so any advice would be appreciated. Thanks!
EDIT 1: (SOLVED)
Have used the suggested code but would like some help with variables used in the string while remaining valid JSON format, if possible.
EDIT 2:
Using that method, can you show an example of how to add multiple users to that one StringEntity? So like user1 is "User1" and has the email "Email1" and user2 has "User2" and "Email2" etc

Just create a url string using the prams you have and pass it as argument to HttpPost()
DefaultHttpClient httpClient = new DefaultHttpClient();
String groupId = "groupId1";
String URL = "http://localhost:8080/"+groupId+"/members/add"
HttpPost postRequest = new HttpPost(
URL );
StringEntity input = new StringEntity("{\"name\":matt,\"from\":\"stackovefflow\"}");
input.setContentType("application/json");
postRequest.setEntity(input);
HttpResponse response = httpClient.execute(postRequest);
UPDATED
The input to StringEntity is a string whihc you can manipulate in any way.
You can define a method like
private createStringEntity(String name, String email){
return new StringEntity("{\"name\":\""+name+"\",\"email\":\""+email+"\"}");
}

The "/groups/..." part is not a parameter but a fraction of the url. I dont think this will work, because "url" is just a String, change it to this:
HttpPost request = new HttpPost("http://stackoverflow.com/groups/[ID]/members/add");

Use Java to get Github repositories

I'm using the following code to send a http request to github.
String url = "https://api.github.com/repositories";
try {
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
HttpPost request = new HttpPost(url);
// StringEntity params = new StringEntity(body);
request.addHeader("content-type", "application/json");
// request.setEntity(params);
HttpResponse result = httpClient.execute(request);
String json = EntityUtils.toString(result.getEntity(), "UTF-8");
System.out.println(json);
} catch (IOException ex) {
}
I got output: {"message":"Not Found","documentation_url":"https://developer.github.com/v3"}
If use directly put "https://api.github.com/repositories" in browser, a lot of useful information will be shown. My question is how can I get the information I see when using browser by using Java.

You should use HttpGet instead of HttpPost. Just like your browser sends a GET request.

Java DefaultHttpClient HTTP PUT and Cookie

I'm send a request to YouTrack api to create issue.
String url = yBaseUrl + "/rest/issue?Task&"+ URLEncoder.encode(subject)+"&"+URLEncoder.encode(desc);
HttpClient client = new DefaultHttpClient();
HttpPut request = new HttpPut(url);
// add request header
((DefaultHttpClient) client).setCookieStore(cookie);
HttpResponse response = null;
//client.execute(post);
try {
response = client.execute(request);
System.out.println(response.getStatusLine().getStatusCode());
} catch (IOException e) {
e.printStackTrace();
}
result - 403 code.
Why setCookieStore not working?

The problem was incorrect api url. Need use /rest/issue?project=Task&summary="+ URLEncoder.encode(subject)... The question is closed

Android http post advanced request with body on hostmachine

I would like to do a HTTP post request from my virtual android device on the hostmachine.
Below you'll see an image on how I post, by using the old WebFetch tool.
I don't know what URL to use for calling the hostmachine?
I got no idea how my body string can be used an input?
Does anybody have an idea on how to solve this?

If you want to connect to the computer which is running the Android simulator, use the IP address 10.0.2.2. You can read more about it here.
Also check out the accepted answer in following question to see how json can be send as post data:
How to send POST request in JSON using HTTPClient?
you can use following code to make HTTP get request:
try {
HttpClient client = new DefaultHttpClient();
String getURL = "http://10.0.2.2:port/your_path_with_parameter";
HttpGet get = new HttpGet(getURL);
HttpResponse responseGet = client.execute(get);
HttpEntity resEntityGet = responseGet.getEntity();
if (resEntityGet != null) {
//do something with the response
Log.i("GET RESPONSE",EntityUtils.toString(resEntityGet));
}
} catch (Exception e) {
e.printStackTrace();
}