Develop Reference

Move CloseableHttpResponse inside nested try with resources

I have the following code using try with resources with CloseableHttpResponse
CloseableHttpResponse response = null;
try (CloseableHttpClient httpClient = HttpClients.custom().build()){
//code...
response = httpClient.execute(target, post);
String responseText = EntityUtils.toString(response.getEntity());
} catch (Exception e) {
logger.error("Failed sending request", e);
} finally {
if (response != null) {
try {
response.close();
} catch (IOException e) {
logger.error("Failed releasing response", e);
}
}
}
Can I safely replace with nested try with resources:
try (CloseableHttpClient httpClient = HttpClients.custom().build()){
URIBuilder uriBuilder = new URIBuilder(url);
HttpHost target = new HttpHost(uriBuilder.getHost(), uriBuilder.getPort(), uriBuilder.getScheme());
HttpPost post = new HttpPost(uriBuilder.build());
try (CloseableHttpResponse response = httpClient.execute(target, post)) {
String responseText = EntityUtils.toString(response.getEntity());
}
} catch (Exception e) {
logger.error("Failed sending request", e);
}
Or is it better to use a single try with resources block:
try (CloseableHttpClient httpClient = HttpClients.custom().build();
CloseableHttpResponse response = getResponse(httpClient, url)) {
Sometime refactoring to single block is problematic, so I wanted to know the a nested/additional block is a valid solution.

HttpClient never returns a null HttpResponse object. The first construct is simply not useful. Both the second and the third constructs are perfectly valid

Unable to post JSON data using HttpPost

I am trying to post JSON data to my API. But after execution I'm getting the following result:
{"name":"Corporate","addr":"Unknown","area":"Unknown","cityId":10,"phone":"--","fax":"--","wooqStoreId":1}]
Response 2 >>{"message":"Blank String","result":"Error","resultCode":"RESULT_CODE_002"}
true
The first 2 lines show my JSON string and
response 2 is the message I'm getting. It should be a successful message as I'm getting status code 200.
public static boolean pushtoAPI(String url, String jsonObject) {
DefaultHttpClient client = new DefaultHttpClient();
HttpPost request = null;
HttpResponse response = null;
String postUrl = getHostUrl() + url;
try {
request = new HttpPost(postUrl);
StringEntity postingString = new StringEntity(jsonObject.toString());
postingString.setContentType("application/json;charset=UTF-8");
postingString.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
"application/json;charset=UTF-8"));
request.setEntity(postingString);
request.setHeader("Content-type", "application/json");
String custom_cookie = ConstantUtil.authCookie(ConstantUtil.getLoginJsessionId());
request.setHeader("Cookie", custom_cookie);
response = client.execute(request);
System.out.println("Response 2 >>" + EntityUtils.toString(response.getEntity()));
if (response.getStatusLine().getStatusCode() == 200) {
System.out.println("true");
return true;
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
} finally {
request.abort();
}
return false;
}

It looks like its a server side code issue.
Can you show where you are creating this string?
"message":"Blank
String","result":"Error","resultCode":"RESULT_CODE_002"

ClascastException in linking JavaConnector in kony

I have created a simple java service in kony app.When i try to run the Test with input parameter i got the following exception.
java.lang.ClassCastException: com.kony.sample.KonyServerConnection cannot be cast to com.konylabs.middleware.common.JavaService
at com.konylabs.middleware.connectors.JavaConnector.execute(JavaConnector.java:142)
at com.pat.tool.keditor.editors.JavaServiceDefinitionEditorPage.getJavaResponse(JavaServiceDefinitionEditorPage.java:1878)
at com.pat.tool.keditor.editors.JavaServiceDefinitionEditorPage$InvokeJavaOperation.run(JavaServiceDefinitionEditorPage.java:1842)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
i followed this Link for reference
i have shared some of java code
private static final String URL = "http://serverurl/sendEmail?";
public static String getServerPersponce(String entitiy,String mHeader){
String responseBody = "";
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(URL);
System.out.println("Requesting : " + httppost.getURI());
try {
StringEntity entity = new StringEntity(entitiy);
if(mHeader != null && !mHeader.equalsIgnoreCase(""))
httppost.addHeader("AuthToken" , mHeader);
httppost.setEntity(entity);
httppost.setHeader("Accept", "application/json");
httppost.setHeader("Content-type", "application/json");
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity1 = response.getEntity();
InputStream stream = entity1.getContent();
responseBody = getStringFromInputStream(stream);
if (response.getStatusLine().getStatusCode() != 200) {
// responseBody will have the error response
}
//responseBody = httpclient.execute(httppost, responseHandler);
System.out.println("responseBody : " + responseBody);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
httpclient.getConnectionManager().shutdown();
}
return responseBody;
}
public static void main(String[] args) throws Exception {
String data = "{\"CC\":[\"yuvarajag#gmail.com\"],\"Content\":\"sample string 2\",\"Subject\": \"sample string 1\",\"To\": [\"yuvarajag#gmail.com\",\"sakumarr#gmail.com\",]}";
String result = getServerPersponce(data, accessToken);
System.out.println("Result "+result);
}
// convert InputStream to String
private static String getStringFromInputStream(InputStream is) {
BufferedReader br = null;
StringBuilder sb = new StringBuilder();
String line;
try {
br = new BufferedReader(new InputStreamReader(is));
while ((line = br.readLine()) != null) {
sb.append(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return sb.toString().trim();
}
This java code is working fine. after creating a jar i included this jar to the Kony app.I am getting exception in kony java service integration.

In the code specified there is no implementation of com.konylabs.middleware.common.JavaService2 class. JavaService will work if you implement JavaService2 class in your class file and override its invoke meathod.
below is the sample:
public class <YOUR CLASS NAME> implements JavaService2 {
#Override
public Object invoke(String serviceId, Object[] arg1,
DataControllerRequest arg2, DataControllerResponse arg3)
throws Exception {
// YOUR LOGIC
return result;
}
}

Kony JavaConnector expects classes that implements JavaServer or JavaService2. Apparently com.kony.sample.KonyServerConnection does not implements them.

Java HTTP-Request with POST-Data

I wrote the following code in java to send some data via POST-Variables to a PHP-File of my website and then I want to get the source code of this website.
public DatabaseRequest(String url, IDatabaseCallback db_cb)
{
this.db_cb = db_cb;
site_url = url;
client = new DefaultHttpClient();
request = new HttpPost(site_url);
responseHandler = new BasicResponseHandler();
nameValuePairs = new ArrayList<NameValuePair>(0);
}
public void addParameter(List<NameValuePair> newNameValuePairs)
{
nameValuePairs = newNameValuePairs;
}
public void run()
{
db_cb.databaseFinish(getContent());
}
public String[] getContent()
{
String result = "";
try {
request.setEntity(new UrlEncodedFormEntity(nameValuePairs));
result = client.execute(request, responseHandler);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
String[] result_arr = result.trim().split("<br>");
for (int i = 0; i < result_arr.length; i++)
{
result_arr[i] = result_arr[i].trim();
}
return result_arr;
}
When I want to run this code, then eclipse throws the following error message:

Try this:
// executes the request and gets the response.
HttpResponse response = client.execute(httpPostRequest);
// get the status code--- 200 = Http.OK
int statusCode = response.getStatusLine().getStatusCode();
HttpEntity httpEntity = response.getEntity();
responseBody = httpEntity.getContent();
if (statusCode = 200) {
// process the responseBody.
}
else{
// there is some error in responsebody
}
EDIT: To handle UnsupportedEncodingException
Before making HTTP request you need to encode the post data in order to convert all string data into valid url format.
// Url Encoding the POST parameters
try {
httpPostRequest.setEntity(new UrlEncodedFormEntity(nameValuePair));
}
catch (UnsupportedEncodingException e) {
// writing error to Log
e.printStackTrace();
}

How can I send HTTP Basic Authentication headers in Android?

I am not sure how to send HTTP Auth headers.
I have the following HttpClient to get requests, but not sure how I can send requests?
public class RestClient extends AsyncTask<String, Void, JSONObject> {
private String convertStreamToString(InputStream is) {
/*
* To convert the InputStream to String we use the
* BufferedReader.readLine() method. We iterate until the
* BufferedReader return null which means there's no more data to
* read. Each line will appended to a StringBuilder and returned as
* String.
*/
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();
}
/*
* This is a test function which will connects to a given rest service
* and prints it's response to Android Log with labels "Praeda".
*/
public JSONObject connect(String url) {
HttpClient httpclient = new DefaultHttpClient();
// Prepare a request object
HttpGet httpget = new HttpGet(url);
// Execute the request
HttpResponse response;
try {
response = httpclient.execute(httpget);
// Examine the response status
Log.i("Praeda", response.getStatusLine().toString());
// Get hold of the response entity
HttpEntity entity = response.getEntity();
if (entity != null) {
// A Simple JSON Response Read
InputStream instream = entity.getContent();
String result = convertStreamToString(instream);
// A Simple JSONObject Creation
JSONObject json = new JSONObject(result);
// Closing the input stream will trigger connection release
instream.close();
return json;
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
protected JSONObject doInBackground(String... urls) {
return connect(urls[0]);
}
#Override
protected void onPostExecute(JSONObject json) {
}
}

This is covered in the HttpClient documentation and in their sample code.

Maybe the documentation of HttpClient can help: link

Since Android compiles HttpClient 4.0.x instead of 3.x, below snippet is for your reference.
if (authState.getAuthScheme() == null) {
AuthScope authScope = new Au HttpRequestInterceptor preemptiveAuth = new HttpRequestInterceptor() {
public void process(final HttpRequest request, final HttpContext context) throws HttpException, IOException {
AuthState authState = (AuthState) context.getAttribute(ClientContext.TARGET_AUTH_STATE);
CredentialsProvider credsProvider = (CredentialsProvider) context.getAttribute(
ClientContext.CREDS_PROVIDER);
HttpHost targetHost = (HttpHost) context.getAttribute(ExecutionContext.HTTP_TARGET_HOST);thScope(targetHost.getHostName(), targetHost.getPort());
Credentials creds = credsProvider.getCredentials(authScope);
if (creds != null) {
authState.setAuthScheme(new BasicScheme());
authState.setCredentials(creds);
}
}
}
};
DefaultHttpClient httpclient = new DefaultHttpClient();
httpclient.addRequestInterceptor(preemptiveAuth, 0);