Develop Reference

Java client with Apache HttpClient to connect to Druid

I am working on ingesting and query data on Druid Server. But, when I query I just using the command line as below:
curl -X 'POST' -H 'Content-Type:application/json' -d #quickstart/ingest_statistic_hourly_generate.json localhost:8090/druid/indexer/v1/task
Can anyone tell me the way of utilizing Java client with Apache HttpClient to send that query to Druid server so as to get response. Thanks so much.

I have not tested this , but this should give you a fair idea of doing this
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.nio.file.Files;
import java.nio.file.Paths;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
public class HTTPTestClient {
public static void main(String[] args) throws Exception {
String url = "http://localhost:8090/druid/indexer/v1/task";
String content = new String(Files.readAllBytes(Paths.get("quickstart/ingest_statistic_hourly_generate.json")));
HttpClient client = HttpClientBuilder.create().build();
HttpPost post = new HttpPost(url);
post.addHeader("Accept", "application/json");
post.addHeader("charset", "UTF-8");
post.addHeader("Content-Type", "application/json");
post.setEntity(new StringEntity(content));
HttpResponse response = client.execute(post);
System.out.println(response.getStatusLine());
System.out.println("Response Code : " + response);
BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer result = new StringBuffer();
String line = "";
while ((line = rd.readLine()) != null) {
result.append(line);
}
System.out.println(result);
}
}

Trying to HTTP-POST to GCM from Java

I'm trying to send a HTTP-POST to the Google Cloud Messaging service. I have setup the correct keys, and everything is working when I use a php script for sending push notifications to my cellphone.
But my Java httpPost only returns a 401 response. I have followed the instructions given at Android Developers but I'm still getting the annoying 401. Am I assigning the header fields wrong?
My Code :
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
public class Server {
public static void main(String[] args) throws IOException {
String url = "https://android.googleapis.com/gcm/send";
HttpClient client = HttpClientBuilder.create().build();
HttpPost post = new HttpPost(url);
HttpPost httppost = new HttpPost("https://android.googleapis.com/gcm/send");
List<NameValuePair> urlParameters = new ArrayList<NameValuePair>();
urlParameters.add(new BasicNameValuePair("registration_id=", "MY_DEVICE_GSM_REG_ID"));
urlParameters.add(new BasicNameValuePair("data=", "Type=value,Lat=58.365547,Long=8.613235,Comment=value"));
httppost.setHeader("Authorization",
"key=MY_API_AUTH_FROM_GOOGLE_API_CONSOLE_BROWSER_TOKEN");
httppost.setHeader("Content-Type",
"application/x-www-form-urlencoded;charset=UTF-8");
post.setEntity(new UrlEncodedFormEntity(urlParameters, "UTF-8"));
HttpResponse response = client.execute(post);
System.out.println("Response Code : "
+ response.getStatusLine().getStatusCode());
BufferedReader rd = new BufferedReader(
new InputStreamReader(response.getEntity().getContent()));
StringBuffer result = new StringBuffer();
String line = "";
while ((line = rd.readLine()) != null) {
result.append(line);
}
}
}

You are setting the Authorization header correctly. There is probably a problem with your API Key.
You do have a problem in your registration ID and payload (which is not related to the 401 error).
This is wrong :
urlParameters.add(new BasicNameValuePair("registration_id=", "MY_DEVICE_GSM_REG_ID"));
urlParameters.add(new BasicNameValuePair("data=", "Type=value,Lat=58.365547,Long=8.613235,Comment=value"));
You should remove the = from the key and each payload parameter should start with data.. Therefore you should have:
urlParameters.add(new BasicNameValuePair("registration_id", "MY_DEVICE_GSM_REG_ID"));
urlParameters.add(new BasicNameValuePair("data.Type", "value"));
urlParameters.add(new BasicNameValuePair("data.Lat", "58.365547"));
urlParameters.add(new BasicNameValuePair("data.Long", "8.613235"));
urlParameters.add(new BasicNameValuePair("data.Comment", "value"));

Sending Json POST to server using name value pair

I am sending Json Post request to server to through url: http://www.xyz.com/login
request structure:
{"requestdata":{"password":"abc","devicetype":"phone","username":"amrit#pqr.com","locale":"in"},"requestcode":10}
Code Snapshot:
MainActivity:
// Building post parameters
// key and value pair
List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>();
nameValuePair.add(new BasicNameValuePair("requestcode", "10"));
nameValuePair.add(new BasicNameValuePair("devicetype", "phone"));
nameValuePair.add(new BasicNameValuePair("locale", "in"));
nameValuePair.add(new BasicNameValuePair("username", "amrit#pqr.com"));
nameValuePair.add(new BasicNameValuePair("password", "abc"));
RestPost post = new RestPost(loginUrl, nameValuePair);
String Response = post.postData();
Log.i("Response:", Response);
RestPost class
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import android.util.Log;
public class RestPost {
String url;
List<NameValuePair> nameValuePairs;
public RestPost(String str, List<NameValuePair> params) {
this.url = str;
this.nameValuePairs = params;
}
public String postData() {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(this.url);
StringBuilder builder = new StringBuilder();
try {
httppost.setEntity(new UrlEncodedFormEntity(this.nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
Log.d("RestClient", "Status Code : " + statusCode);
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(
content));
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
return builder.toString();
}
}
But I'm not getting appropriate response, could anyone help me in sending appropriate format for getting server response. Thanks in advance.
Response which I'm getting:
{"error":{"resultCode":"400","status":"Invalid Request format"}}

You are currently sending the JSON in the form of
{
"requestcode": "10",
"devicetype": "phone",
"locale": "in",
"username": "amrit#pqr.com",
"password": "abc"
}
Which isn't the form the server is asking for. Try creating a string of the JSON you want to send. Then use:
httppost.setEntity(new StringEntity(jsonString, "UTF8"));
httppost.setHeader("Content-type", "application/json");
To send the string to the server.

I'm using AndroidHttpClient to post the request
AndroidHttpClient httpClient = AndroidHttpClient.newInstance("User Agent");
URL urlObj = new URL(url);
HttpHost host = new HttpHost(urlObj.getHost(), urlObj.getPort(), urlObj.getProtocol());
AuthScope scope = new AuthScope(urlObj.getHost(), urlObj.getPort());
HttpContext credContext = new BasicHttpContext();
HttpPost httpPost = new HttpPost (url);
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairsArrayList));
// Execute post request and get http response
HttpResponse httpResponse = httpClient.execute(host, httpPost, credContext);
httpClient.close();
This works perfectly for me.

AndroidHttpClient http = AndroidHttpClient.new Instance("hai");

REST call using ApacheHttpClient with data and headers

I need to integrate Kii MbaaS services in one of my web application apart from the Mobile apps. I was using the Android SDK and was able to connect it. However for website using Java solution they don't have any SDK and asked me to do th operation using REST. Now I was planning to use ApacheHttpClient from a Servlet to connect to the REST services. The REST format from their docs is given below. In ApacheHttpClient I know I can pass the headers(-H) as HttpGet.addHeader("content-type", "application/json"). However I am not sure how to pass the data (-d). Can anyone help me here by pointing to any tutorial link or any sample code on how to pass data to a REST service along with headers?
The REST syntax is given below-
curl -v -X POST \
-H "content-type:application/json" \
-H "x-kii-appid:{APP_ID}" \
-H "x-kii-appkey:{APP_KEY}" \
"https://api.kii.com/api/oauth2/token" \
-d '{"username":"user_123456", "password":"123ABC"}'
Thanks in advance.
------------------------- Edit--------------------------------------------------
here is a sample java code I wrote to connect to using Apache HttpClient 4.3 library however I keep getting error as 400... can anyone pls advice?
error -
Exception in thread "main" java.lang.RuntimeException: Failed : HTTP
error code : 400 at
com.app.test.RestClientTest.main(RestClientTest.java:49)
package com.app.test;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.Consts;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
public class RestClientTest {
/**
* #param args
*/
public static void main(String[] args) {
CloseableHttpClient httpClient = null;
HttpPost httpost = null;
CloseableHttpResponse response = null;
try {
httpClient = HttpClients.createDefault();
httpost = new HttpPost("https://api.kii.com/api/oauth2/token");
httpost.addHeader("content-type", "application/json");
httpost.addHeader("x-kii-appid", "xxxxx");
httpost.addHeader("x-kii-appkey", "xxxxxxxx");
List<NameValuePair> nvps = new ArrayList<NameValuePair>();
nvps.add(new BasicNameValuePair("username", "xxxxx"));
nvps.add(new BasicNameValuePair("password", "xxxxx"));
// StringEntity input = new
// StringEntity("{\"qty\":100,\"name\":\"iPad 4\"}");
// input.setContentType("application/json");
httpost.setEntity(new UrlEncodedFormEntity(nvps, Consts.UTF_8));
response = httpClient.execute(httpost);
if (response.getStatusLine().getStatusCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : "
+ response.getStatusLine().getStatusCode());
}
BufferedReader br = new BufferedReader(new InputStreamReader(
(response.getEntity().getContent())));
String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
System.out.println(output);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try{
response.close();
httpClient.close();
}catch(Exception ex) {
ex.printStackTrace();
}
}
}
}

Ok I got it solved. I need to wrap up the data in json format stringentity and post it and it will work.
Here I am posting the same for others who are planning to use the Kii MbaaS in their web apps apart from the Mobile app.
package com.app.test;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
public class RestClientTest {
/**
* #param args
*/
public static void main(String[] args) {
CloseableHttpClient httpClient = null;
HttpPost httpPost = null;
CloseableHttpResponse response = null;
try {
httpClient = HttpClients.createDefault();
httpPost = new HttpPost("https://api.kii.com/api/oauth2/token");
List<NameValuePair> nvps = new ArrayList<NameValuePair>();
nvps.add(new BasicNameValuePair("content-type", "application/json"));
nvps.add(new BasicNameValuePair("x-kii-appid", "xxxxx"));
nvps.add(new BasicNameValuePair("x-kii-appkey", "xxxxxxxxxxxxxx"));
StringEntity input = new StringEntity("{\"username\": \"dummyuser\",\"password\": \"dummypassword\"}");
input.setContentType("application/json");
httpPost.setEntity(input);
for (NameValuePair h : nvps)
{
httpPost.addHeader(h.getName(), h.getValue());
}
response = httpClient.execute(httpPost);
if (response.getStatusLine().getStatusCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : "
+ response.getStatusLine().getStatusCode());
}
BufferedReader br = new BufferedReader(new InputStreamReader(
(response.getEntity().getContent())));
String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
System.out.println(output);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try{
response.close();
httpClient.close();
}catch(Exception ex) {
ex.printStackTrace();
}
}
}
}

How to add,set and get Header in request of HttpClient?

In my application I need to set the header in the request and I need to print the header value in the console...
So please give an example to do this the HttpClient or edit this in my code...
My Code is ,
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
public class SimpleHttpPut {
public static void main(String[] args) {
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("http://http://localhost:8089/CustomerChatSwing/JoinAction");
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("userId",
"123456789"));
post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = client.execute(post);
BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String line = "";
while ((line = rd.readLine()) != null) {
System.out.println(line);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
Thanks in advance...

You can use HttpPost， there are methods to add Header to the Request.
DefaultHttpClient httpclient = new DefaultHttpClient();
String url = "http://localhost";
HttpPost httpPost = new HttpPost(url);
httpPost.addHeader("header-name" , "header-value");
HttpResponse response = httpclient.execute(httpPost);

On apache page: http://hc.apache.org/httpcomponents-client-ga/tutorial/html/fundamentals.html
You have something like this:
URIBuilder builder = new URIBuilder();
builder.setScheme("http").setHost("www.google.com").setPath("/search")
.setParameter("q", "httpclient")
.setParameter("btnG", "Google Search")
.setParameter("aq", "f")
.setParameter("oq", "");
URI uri = builder.build();
HttpGet httpget = new HttpGet(uri);
System.out.println(httpget.getURI());

You can test-drive this code exactly as is using the public GitHub API (don't go over the request limit):
public class App {
public static void main(String[] args) throws IOException {
CloseableHttpClient client = HttpClients.custom().build();
// (1) Use the new Builder API (from v4.3)
HttpUriRequest request = RequestBuilder.get()
.setUri("https://api.github.com")
// (2) Use the included enum
.setHeader(HttpHeaders.CONTENT_TYPE, "application/json")
// (3) Or your own
.setHeader("Your own very special header", "value")
.build();
CloseableHttpResponse response = client.execute(request);
// (4) How to read all headers with Java8
List<Header> httpHeaders = Arrays.asList(response.getAllHeaders());
httpHeaders.stream().forEach(System.out::println);
// close client and response
}
}