Develop Reference

JSON Post Request contains no parameters

I have a problem by my json post request. I created a JsonObject and want to post it to the server but the body of the post request which is received by the server contains nothing and I don't know why...
public class ServiceHandler {
static String response = null;
public final static int GET = 1;
public final static int POST = 2;
String contentType = "application/json";
public ServiceHandler() {
}
public String makeServiceCall(String url, int method) {
return this.makeServiceCall(url, method, null);
}
public String makeServiceCall(String url, int method, List<NameValuePair> params) {
try {
// http client
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpEntity httpEntity = null;
HttpResponse httpResponse = null;
// Checking http request method type
if (method == POST) {
HttpPost httpPost = new HttpPost(url);
// adding post params
if (params != null) {
JSONObject jsonObj = new JSONObject();
jsonObj.put("name", "your name");
jsonObj.put("message", "your message");
StringEntity entity = new StringEntity(jsonObj.toString(), HTTP.UTF_8);
httpPost.setEntity(entity);
}
httpResponse = httpClient.execute(httpPost);
} else if (method == GET) {
// appending params to url
if (params != null) {
String paramString = URLEncodedUtils
.format(params, "utf-8");
url += "?" + paramString;
}
HttpGet httpGet = new HttpGet(url);
httpResponse = httpClient.execute(httpGet);
}
httpEntity = httpResponse.getEntity();
response = EntityUtils.toString(httpEntity);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return response;
}

Provide "Content-Type" header to request with value "application/json". It seems server can't found proper message body mapper.

Retrieve get response with Android

I have an app android that in an AsyncTask make 2 get request to a servlet.
I want to retrieve a String that contains a simple response.
This is my AsyncTask:
protected String doInBackground(Void... params) {
return uploadFile();
}
#SuppressWarnings("deprecation")
private String uploadFile() {
String responseString = null;
String responseStr = null;
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(Config.FILE_UPLOAD_URL);
try {
AndroidMultiPartEntity entity = new AndroidMultiPartEntity(
new ProgressListener() {
#Override
public void transferred(long num) {
publishProgress((int) ((num / (float) totalSize) * 100));
}
});
File sourceFile = new File(filePath);
// Adding file data to http body
entity.addPart("image", new FileBody(sourceFile));
totalSize = entity.getContentLength();
httppost.setEntity(entity);
// Making server call
HttpResponse response = httpclient.execute(httppost);
HttpEntity r_entity = response.getEntity();
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode == 200) {
// Server response
responseString = EntityUtils.toString(r_entity);
try {
HttpClient client = new DefaultHttpClient();
URI getURL = new URI("http://192.168.1.101:8080/MusaServlet?collection="+collection+"&name="+filename);
Log.i("QUERY",getURL.getQuery());
HttpGet get = new HttpGet(getURL);
HttpResponse responseGet = client.execute(get);
HttpEntity resEntityGet = responseGet.getEntity();
if (resEntityGet != null) {
Log.i("GET RESPONSE",EntityUtils.toString(resEntityGet));
}
responseStr = EntityUtils.toString(responseGet.getEntity());
} catch (Exception e) {
e.printStackTrace();
}
} else {
responseString = "Error occurred! Http Status Code: "
+ statusCode;
}
} catch (ClientProtocolException e) {
responseString = e.toString();
} catch (IOException e) {
responseString = e.toString();
}
return responseStr;
}
Instead the servlet code is:
PrintWriter out = response.getWriter();
out.println("HELLO STUPID APP!");
However the dialog showed by app is empty! No words!
What's the problem guys?
Thank's

At first check your GET request status code as
responseGet.getStatusLine().getStatusCode();
If is giving number 200 then GET is successfull.
Now if is 200 then you will get the response what you have sent by following code
HttpEntity resEntityGet = responseGet.getEntity();
and then
String result;
if(resEntityGet !=null ){
result= EntityUtils.toString(resEntityGet);
}
Now the most important thing is once you perform responseGet.getEntity() the data of GET response will be passed to the variable.. you assign.. and later on calling responseGet.getEntity() will always return empty...
That may be the reason you are getting empty response in your dialog

EDIT:
Ok I have modified my code and playing with logcat I'm sure that the responseCode is not 200.
What is the problem now? -.-"

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();
}

HttpClient.excute(HttpPost) no response

I constructed an HttpClient, and set timeout parameters.
the code is like this:
while(bufferedinputstream.read()!=-1){
post.setEntity(multipartEntity);
HttpResponse response = httpClient.excute(post);
}
it worked fine for the first several request, and then somehow the response is not returned, and no exception or timeout exception was thrown. Anyone has any idea what's happening?

since you re not getting any errors or exceptions (do you print them out?), you could check the satusCode of your response. Maybe it helps.
(overridden method from my AsyncTask)
protected String doInBackground(String... arg) {
String url = arg[0]; // Added this line
//...
Log.i(DEBUG_TAG, "URL CALL -> " + url);
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
String mResponse = "";
try {
List<NameValuePair> params = new LinkedList<NameValuePair>();
//...
post.setEntity(new UrlEncodedFormEntity(params));
HttpResponse mHTTPResponse = client.execute(post);
StatusLine statusLine = mHTTPResponse.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) { //
//get response
BufferedReader rd = new BufferedReader(new InputStreamReader(
mHTTPResponse.getEntity().getContent()));
StringBuilder builder = new StringBuilder();
String aux = "";
while ((aux = rd.readLine()) != null) {
builder.append(aux);
}
mResponse = builder.toString();
} else {
//cancel task and show error
Log.e(DEBUG_TAG, "ERROR in Request:" + statusCode);
this.cancel(true);
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return mResponse;
}

Retrieve the http code of the response in java

I have the following code for make a post to an url an retrieve the response as a String. But I'd like to get also the HTTP response code (404,503, etc). Where can I recover it?
I've tried with the methods offered by the HttpReponse class but didn't find it.
Thanks
public static String post(String url, List<BasicNameValuePair> postvalues) {
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
if ((postvalues == null)) {
postvalues = new ArrayList<BasicNameValuePair>();
}
httppost.setEntity(new UrlEncodedFormEntity(postvalues, "UTF-8"));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
return requestToString(response);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
private static String requestToString(HttpResponse response) {
String result = "";
try {
InputStream in = response.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder str = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
str.append(line + "\n");
}
in.close();
result = str.toString();
} catch (Exception ex) {
result = "Error";
}
return result;
}

You can modify your code like this:
//...
HttpResponse response = httpclient.execute(httppost);
if(response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
//edit: there is already function for this
return EntityUtils.toString(response.getEntity(), "UTF-8");
} else {
//Houston we have a problem
//we should do something with bad http status
return null;
}
EDIT: just one more thing ...
instead of requestToString(..); you can use EntityUtils.toString(..);

Have you tried this?
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
response.getStatusLine().getStatusCode();

Have you tried the following?
response.getStatusLine().getStatusCode()