I'm using HttpClient and and I use httpCore.jar and still I'm facing an exception
java.lang.ClassNotFoundException: org.apache.http.config.Lookup Error
around
HttpClient client = HttpClientBuilder.create().build();
My full code is following
package com.rest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
public class Test33 {
/**
* #param args
* #throws IOException
* #throws ClientProtocolException
*/
public static void main(String[] args) throws ClientProtocolException, IOException {
String url = "http://www.google.com/search?q=httpClient";
HttpClient client = HttpClientBuilder.create().build();
HttpGet request = new HttpGet(url);
HttpResponse response = client.execute(request);
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);
}
}
}
The class is available in httpcore 4.4.4.jar, Please check the version of jar and I tried your code and it doesn't throw any class not found exception. If jar is there then please make sure that jar is added to application classpath.
Related
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);
}
}
I have a URL with data I would like to access. The data is in text form and it is password protected...but here's the thing...it is password protected by a different website. I have spent weeks on this issue. When I use Apache HttpClient, I can log into the login URL just fine, but I cannot figure out how to gain access to the data URL. Every time I try to gain access to the data URL, I get an HTTP 500 error. Any suggestions for this issue? I don't think this is a very common problem considering I have not come across it in my many Stackoverflow and Google searches. THANK YOU SO MUCH IF YOU CAN HELP :)
Below is an example of one of the programs I have tried using to no avail...(Some of the information is private, so I changed the username, password, and url)
package Apache1;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import java.net.*;
import java.io.*;
/**
* A simple example that uses HttpClient to execute an HTTP request against
* a target site that requires user authentication.
*/
public class Apache2 {
public static void main(String[] args) throws Exception {
CredentialsProvider credsProvider = new BasicCredentialsProvider();
credsProvider.setCredentials(
new AuthScope("localhost", 443),
new UsernamePasswordCredentials("myUsername", "myPW"));
CloseableHttpClient httpclient = HttpClients.custom()
.setDefaultCredentialsProvider(credsProvider)
.build();
try {
HttpGet httpget = new HttpGet("LOGIN URL");
System.out.println("Executing request " + httpget.getRequestLine());
CloseableHttpResponse response = httpclient.execute(httpget);
try {
System.out.println("----------------------------------------");
System.out.println(response.getStatusLine());
EntityUtils.consume(response.getEntity());
URL oracle = new URL("DATA URL");
URLConnection yc = oracle.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(
yc.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null)
System.out.println(inputLine);
in.close();
} finally {
response.close();
}
} finally {
httpclient.close();
}
}
}
Here is my most recent code to handle the cookies. I keep getting a HTTP 500 error.
package Apache1;
//import org.apache.http.*;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import java.net.*;
import java.io.*;
/**
* A simple example that uses HttpClient to execute an HTTP request against
* a target site that requires user authentication.
*/
public class Apache2 {
public static void main(String[] args) throws Exception {
CredentialsProvider credsProvider = new BasicCredentialsProvider();
credsProvider.setCredentials(
new AuthScope("localhost", 443),
new UsernamePasswordCredentials("myUSERNAME", "myPASSWORD"));
CloseableHttpClient httpclient = HttpClients.custom()
.setDefaultCredentialsProvider(credsProvider)
.build();
try {
HttpGet httpget = new HttpGet("LOGIN_WEBSITE");
System.out.println("Executing request " + httpget.getRequestLine());
CloseableHttpResponse response = httpclient.execute(httpget);
try {
System.out.println("----------------------------------------");
System.out.println(response.getStatusLine());
EntityUtils.consume(response.getEntity());
URL oracle = new URL("DATA_WEBSITE");
URLConnection yc = oracle.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(
yc.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null)
System.out.println(inputLine);
in.close();
} finally {
response.close();
}
} finally {
httpclient.close();
}
}
}
I'm following this tutorial :
http://www.tutos-android.com/importer-ajouter-certificat-ssl-auto-signe-bouncy-castle-android/comment-page-2#comment-2159
(SSl auto signed certificate problem)
JsonParserFUnction code :
package com.example.androidsupervision;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.util.ArrayList;
import java.util.List;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import org.apache.http.HttpEntity;
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.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.conn.ssl.X509HostnameVerifier;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.SingleClientConnManager;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.content.Context;
import android.util.Log;
public class JsonReaderPost {
public JsonReaderPost() {
}
public void Reader() throws IOException, JSONException, KeyStoreException, NoSuchAlgorithmException, CertificateException, KeyManagementException, UnrecoverableKeyException {
String ints = "";
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("query","SELECT+AlertId+FROM+Orion.Alerts"));
//HttpClient client = new DefaultHttpClient();
**//Here is the problem**
HttpClient client =new MyHttpClient(getApplicationContext());
HttpPost httpPost = new
HttpPost("https://192.168.56.101:17778/SolarWinds/InformationService/v3/Json/Query");
httpPost.addHeader("content-type", "application/json");
httpPost.addHeader("Authorization", "Basic YWRtaW46");
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse response;
String result = null;
response = client.execute(httpPost);
HttpEntity entity = response.getEntity();
if (entity != null) {
// A Simple JSON Response Read
InputStream instream = entity.getContent();
result = convertStreamToString(instream);
// now you have the string representation of the HTML request
// System.out.println("RESPONSE: " + result);
Log.e("Result", "RESPONSE: " + result);
instream.close();
}
// Converting the String result into JSONObject jsonObj and then into
// JSONArray to get data
JSONObject jsonObj = new JSONObject(result);
JSONArray results = jsonObj.getJSONArray("results");
for (int i = 0; i < results.length(); i++) {
JSONObject r = results.getJSONObject(i);
ints = r.getString("AlertId");
Log.e("Final Result", "RESPONSE: " + ints);
}
}
public static String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
I get in this line an error :
HttpClient client =new MyHttpClient(getApplicationContext());
The error is : The method getApplicationContext() is undefined for the type JsonReaderPost
You should send the context of your activity when you instantiate the class:
private Context mContext;
public JsonReaderPost(Context mContext) {
this.mContext = mContext;
}
Then, you should use "mContext" instead of getApplicationContext();
It is unknown because your class doesn't extend any other Class that has a Context, so it doesn't know what that method is. Such is, for example, an Activity.
However, using getApplicationContext(), unless you really know what you're doing, is almost always wrong. This will bring undesired behaviors like Exceptions when handled not properly. You should always use the Context of the class you're handling.
You can know which classes implement Context and get more info on contexts here.
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();
}
}
}
}
My code can only return response status message or status code, but I need my code to return response in "view source" format i.e. in XML format :
import java.io.IOException;
import java.net.URL;
import java.net.HttpURLConnection;
public class API{
public static void main(String args[]) throws IOException
{
URL url = new URL("http://example.com");
HttpURLConnection http = (HttpURLConnection)url.openConnection();
String statusCode = http.getResponseMessage();
System.out.println(statusCode);
}
}
You have to get stream and then read it. Like this:
import java.io.IOException;
import java.net.URL;
import java.net.HttpURLConnection;
public class API{
public static void main(String args[]) throws IOException
{
URL url = new URL("http://example.com");
HttpURLConnection http = (HttpURLConnection)url.openConnection();
String statusCode = http.getResponseMessage();
System.out.println(statusCode);
//read the result from the server
BufferedReader rd = new BufferedReader(new InputStreamReader(http.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = rd.readLine()) != null)
{
sb.append(line);
}
System.out.println(sb.toString());
}
}