Develop Reference

Odata V4 Client: getEntityCreate method

I developed an ODataClient in Java in order to create new entities. I am encountering difficulties to create new entities. I took the initiative to see all messages sent by my client with Fiddler.
ODataEntityCreateRequest<ClientEntity> request=
client.getCUDRequestFactory()
.getEntityCreateRequest(new URI("http://localhost:8888/"), clientEntity);
request.addCustomHeader("Content-Type", "application/json;odata.metadata=minimal");
request.setAccept("application/json;odata=minimalmetadata");
ODataEntityCreateResponse<ClientEntity> response = request.execute();
below the first line of the body I obtained with Fiddler:
17b
{"#odata.type":"#ODataDemo.Product", ....}
I tested manually with Fiddler to create a new entity and the first line of message body should be:
{"odata.type":"ODataDemo.Product", ....}
I would like to know if it possible to set the body of the request with Odata in order to delete "#" and "#".
Thanks,

I found an alternative solution to this problem. I do not use entirely OData libraries. I created methods to to the post Request.
public void insertData(String entityName, Entity entity)
{
try {
ResWrap<Entity> resW = new ResWrap<Entity>(new URI(this.baseURI.concat("/").concat(entityName)), "full", entity);
ClientEntity clientEntity = this.client.getBinder().getODataEntity(resW);
//String message = getMessageRebuild(client.getWriter().writeEntity(clientEntity, ContentType.APPLICATION_JSON));
InputStream is = client.getWriter().writeEntity(clientEntity, ContentType.APPLICATION_JSON);
if(is != null)
{
System.out.println("POST: "+post(this.baseURI.concat("/").concat(entityName), is));
//System.out.println("POST:"+post("http://localhost:8888/"+entityName, is));
}
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ODataSerializerException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public String post(String url,InputStream message) throws Exception{
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
//post.addHeader("Content-Type", "application/json;odata.metadata=minimal");
//post.addHeader("Accept", "application/json;odata=verbose");
post.addHeader("Content-Type", "application/json");
post.addHeader("Accept", "application/json");
HttpEntity entity = new ByteArrayEntity(IOUtils.toByteArray(message));
post.setEntity(entity);
HttpResponse response = client.execute(post);
String result = EntityUtils.toString(response.getEntity());
return result;
}
insertData take two parameters : entityName + Entity I generated.
I use the librairie org.apache.http to send the http message to the OData Server.

How to send Header using HTTP in JAVA

I have this command.
# curl --header "Authorization: key=$api_key" --header Content-Type:"application/json" https://android.googleapis.com/gcm/send -d "{\"registration_ids\":[\"ABC\"]}"
it is sending push notification in my device. Now I am trying java to sending it but my code is not working.
String body = "{\"registration_ids\":[\"ABC\"]}";
HttpPost httppost = new HttpPost("https://android.googleapis.com/gcm/send");
StringEntity stringentity = new StringEntity(body, "UTF-8");
httppost.addHeader("Content-Type","application/json");
httppost.addHeader("Authorization: key", "AIza*********YUI");
httppost.setEntity(stringentity);
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response;
try {
response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
String strresponse = null;
if (entity != null) {
strresponse = EntityUtils.toString(entity);
System.out.println("strresponse = "+strresponse);
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
I am confuse what i am missing. This doc http://developer.android.com/google/gcm/http.html#request told that i needs to send header with body.

Based on your curl example, this should be your Authorization header:
httppost.addHeader("Authorization", "key=AIza*********YUI");
This should resolve your issue. I just confirmed this header with the referenced documentation.

Java HTTP Request Stuck

I've never really used http requests in Java, I'm trying to make a request that would basically recreate this http://supersecretserver.net:8080/http://whateverwebsite.com
This server takes whatever website and returns only the text of the page in the body of the response.
The code is as follows:
public String getText(String webPage) throws ParseException, IOException{
HttpResponse response = null;
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI("http://supersecretserver.net:8080/" + "http://www.androidhive.info/2012/01/android-text-to-speech-tutorial/"));
response = client.execute(request);
} catch (URISyntaxException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String responseBody = "No text found on webpage.";
int responseCode = response.getStatusLine().getStatusCode();
switch(responseCode) {
case 200:
HttpEntity entity = response.getEntity();
if(entity != null) {
responseBody = EntityUtils.toString(entity);
}
}
System.out.println("Returning Response..");
System.out.println(responseBody);
return responseBody;
}
It seems to get stuck on
response = client.execute(request);
I'm not sure what the problems is, any insight would be helpful.

Seems likely that your HttpClient is not timing out, you can set a timeout value by following this example (from http://www.jayway.com/2009/03/17/configuring-timeout-with-apache-httpclient-40/)
You just to have to consider a timeout value that makes sense for you.
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpParams params = httpClient.getParams();
HttpConnectionParams.setConnectionTimeout(httpParams, connectionTimeoutMillis);
HttpConnectionParams.setSoTimeout(httpParams, socketTimeoutMillis);
Also as your HttpClient is not connecting (since it's getting stuck) you should also take into consideration why is that happening (maybe you need to configure a proxy?)

Error HTTP 422 GET in Android

I'm trying to perform a GET request to the server that returns me a JSON file. But I am getting an error in the HTTP statusLine / 422. Anyone know why. Below I show how I'm doing
public void testConverteArquivoJsonEmObjetoJava() {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet get = new HttpGet(
"http://safe-sea-4024.ppooiheroku4554566adffasdfasdfalaqwerpcp.com/crimes/mobilelist");
get.setHeader("Accept", "application/json");
get.setHeader("Content-type", "application/json");
get.getParams()
.setParameter("token",
"0V1AYFK12SeCZHYgXbNMew==$tRqPNplipDwtbD0vxWv6GPJIT6Yk5abwca3IJ88888a6JhMs=");
HttpResponse httpResponse;
try {
httpResponse = httpClient.execute(get);
String jsonDeResposta = EntityUtils.toString(httpResponse
.getEntity());
System.out.println();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

Usually you do not specify a Content-Type header with a GET request. This header tells the server how to interpret the entity includes in the message. It is possible that the server side is expecting a JSON entity even though GET cannot include a body. Try removing the Content-Type header.
I tried the URL that you cleverly changed and got it to work fine. However, I did get a 422 when I specified a different token query parameter. Being that the status line is missing a phrase, I would assume that the Ruby application is generating it.

I managed to solve the problem. I was passing the parameter so wrong. According to this post [blog]:How to add parameters to a HTTP GET request in Android? "link". This method is used to that I kind of POST request
this method is correct
public void testConverteArquivoJsonEmObjetoJava() {
List<NameValuePair> params = new LinkedList<NameValuePair>();
params.add(new BasicNameValuePair("token","0V1AYFK12SeCZHYgXbNMew==$="));
String paramString = URLEncodedUtils.format(params, "utf-8");
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet get = new HttpGet(
"http://safep.com/crimes/mobilelist" + "?"
+ paramString);
HttpResponse httpResponse;
try {
httpResponse = httpClient.execute(get);
String jsonDeResposta = EntityUtils.toString(httpResponse
.getEntity());
System.out.println();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}`

Sending file using http in android and receiving in jsp

I'm new to http file transfer. I want to send a file from android sdcard to server. For that i tried the below code. I converted the bytes to json string and sent it to the server. But I'm unable to receive it on the server side. I'm using jsp on server side. But there should be some efficient way to do this. Please provide me some ideas.
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2:8084/httptest");
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
String encodedString = convertURL(jsonString);
nameValuePairs.add(new BasicNameValuePair("wavfil", encodedString));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
if (entity != null) {
String responseString = EntityUtils.toString(entity, "UTF-8");
Toast.makeText(this, responseString, Toast.LENGTH_SHORT).show();
tv.setText(responseString);
Log.d("HTTP LOG", responseString);
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
jsp
<%
String value = request.getParameter("wavfil");
byte[] wavByte = value.getBytes();
FileOutputStream fos = new FileOutputStream("/TESTFILE.wav");
fos.write(wavByte, 0, wavByte.length);
if (wavByte != null) {
out.println("Success");
} else {
out.println("Failed");
}
%>

Add below lines
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.x.x.x:8084/httptest");
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
String encodedString = convertURL(jsonString);
nameValuePairs.add(new BasicNameValuePair("wavfil", encodedString));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
//Create and attach file to the Post
File file = new File("pathto your file"); //replace with actual path
MultipartEntity entity = new MultipartEntity();
httppost.setEntity(entity);
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
entity.addPart("file", new FileBody(file));
if (entity != null) {
String responseString = EntityUtils.toString(entity, "UTF-8");
Toast.makeText(this, responseString, Toast.LENGTH_SHORT).show();
tv.setText(responseString);
Log.d("HTTP LOG", responseString);
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}