Develop Reference

Java/Yahoo Finance Retrieving Quotes, Error 401

Here's my Java code to download historical Yahoo finance quotes using crumbs. Sorry, it's not the most efficient code. I'm still learning Java. Everything looks correct to me, but I get error 401 after picking up the crumb and trying to make the second access to "https"//query1.finance.yahoo.com..."
Any ideas of what I'm doing wrong?
URL myUrl = null;
try {
myUrl = new URL("https://finance.yahoo.com");
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
URLConnection urlConn = null;
try {
urlConn = myUrl.openConnection();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
urlConn.connect();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
String headerName=null;
String crumb = null;
for (int i = 1; (headerName = urlConn.getHeaderFieldKey(i)) != null; i++) {
if (headerName.equals("Set-Cookie")) {
String cookie = urlConn.getHeaderField(i);
cookie = cookie.substring(0, cookie.indexOf(";"));
crumb = cookie.substring(cookie.indexOf("=") + 1, cookie.indexOf("&"));
}
}
StringBuilder qUrl = new StringBuilder();
qUrl.append("https://query1.finance.yahoo.com/v7/finance/download/AAPL");
qUrl.append("?period1=" + 1495813803L);
qUrl.append("&period2=" + 1497887408L);
qUrl.append("&interval=1d");
qUrl.append("&events=history");
qUrl.append("&crumb=" + crumb);
URL url = null;
try {
url = new URL(qUrl.toString());
} catch (MalformedURLException e) {
e.printStackTrace();
}
URLConnection conn;
InputStream is = null;
try {
conn = url.openConnection();
String redirect = conn.getHeaderField("Location"); // Can handle one redirection
if(redirect != null ) {
conn = new URL(redirect).openConnection();
}
is = conn.getInputStream();
} catch (IOException e) {
e.printStackTrace();
}

how to post json objects to webservices like url

I want to pass JSON objects to web services like this
firstname=jhon&lastname=mic&mail=jhon#gmail.com&sex=M&hometown=blablabla
how can I pass,any one please help me.Am trying like this
JSONObject json = new JSONObject();
json.put("firstname", firstname);
json.put("lastname", laststname);
json.put("mail", mail);
json.put("sex", sex);
json.put("hometown", hometown)
HttpClient client=new DefaultHttpClient();
HttpPost post=new HttpPost(url);
post.setEntity(new ByteArrayEntity(json1.toString().getBytes("UTF8")));
HttpResponse response = client.execute(post);
HttpEntity entity = response.getEntity();
if(entity!=null)
{
InputStream instream=entity.getContent();
String result=convertStreamToString(instream);
}
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();
}
But this code not posted the right value to webservice,Is there any wrong please help me ,
Thank you:)

StringBuilder bu = new StringBuilder();
for(int i = 0; i<json.names().length(); i++){
bu.append("&");
try {
bu.append(json.names().getString(i)+"="+json.get(json.names().getString(i)));
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
bu.toString();//give you parameters

Android: download .html and convert it to String

I need to download .html file from some URL. How can I do it? And how can I convert it to String?
UPDATED:
I have no idea why you downvoting. I can get the desired result on iOS by only using one method stringWithContentsOfURL:encoding:error:. And I suggested that Android has similar. method

Code below downloads html page from link, and return html page converted to string in completion callback
public class HTMLPageDownloader extends AsyncTask<Void, Void, String> {
public static interface HTMLPageDownloaderListener {
public abstract void completionCallBack(String html);
}
public HTMLPageDownloaderListener listener;
public String link;
public HTMLPageDownloader (String aLink, HTMLPageDownloaderListener aListener) {
listener = aListener;
link = aLink;
}
#Override
protected String doInBackground(Void... params) {
// TODO Auto-generated method stub
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(link);
String html = "";
try {
HttpResponse response = client.execute(request);
InputStream in;
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);
}
in.close();
html = str.toString();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return html;
}
#Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if (!isCancelled()) {
listener.completionCallBack(result);
}
}
}

How's this:
URL url;
InputStream is = null;
DataInputStream dis;
String line;
String out = "";
try {
url = new URL("http://www.example.com/");
is = url.openStream(); // throws an IOException
dis = new DataInputStream(new BufferedInputStream(is));
while ((line = dis.readLine()) != null) {
out.append(line);
}
} catch (MalformedURLException mue) {
mue.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
} finally {
try {
is.close();
} catch (IOException ioe) {
}
}

You can use http://jsoup.org library
or
URL url = new URL("http://www.android.com/");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
try {
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
readStream(in);
}finally {
urlConnection.disconnect();
}
and covert Input Stream to String
BufferedReader br = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line);
}
System.out.println(sb.toString());
br.close();

You could use HttpURLConnection, streams, and a ReadableByteChannel.
I feel this helps down the line for adding request info to the connection.
try {
URL test = new URL(/* link to your resource */);
HttpURLConnection httpcon = (HttpURLConnection) test.openConnection();
httpcon.addRequestProperty("User-Agent", "Mozilla/5.0");
ReadableByteChannel rbc = Channels.newChannel(httpcon.getInputStream());
FileOutputStream fos = new FileOutputStream(/* File output here */);
fos.getChannel().transferFrom(rbc, 0, 1 << 24);
fos.close();
} catch (FileNotFoundException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
}

How do I display a Java HttpPost object as a string?

I am creating an HttpPost object in Android to communicate with a server operated by a client. Unfortunately the server isn't providing either of us with very useful error messages; I would like to see the content of the HttpPost object as a string so I can send it to our client and he can compare it with what he's expecting.
How can I convert an HttpPost object into a string that reflects how it would look as it arrived at the server?

Should use it after execute
public static String httpPostToString(HttpPost httppost) {
StringBuilder sb = new StringBuilder();
sb.append("\nRequestLine:");
sb.append(httppost.getRequestLine().toString());
int i = 0;
for(Header header : httppost.getAllHeaders()){
if(i == 0){
sb.append("\nHeader:");
}
i++;
for(HeaderElement element : header.getElements()){
for(NameValuePair nvp :element.getParameters()){
sb.append(nvp.getName());
sb.append("=");
sb.append(nvp.getValue());
sb.append(";");
}
}
}
HttpEntity entity = httppost.getEntity();
String content = "";
if(entity != null){
try {
content = IOUtils.toString(entity.getContent());
} catch (Exception e) {
e.printStackTrace();
}
}
sb.append("\nContent:");
sb.append(content);
return sb.toString();
}
snippet

I usually do post in this way (The server answer is a JSON object) :
try {
postJSON.put("param1", param1);
postJSON.put("param2",param2);
} catch (JSONException e) {
e.printStackTrace();
}
String result = JSONGetHTTP.postData(url);
if (result != null) {
try {
JSONObject jObjec = new JSONObject(result);
}
} catch (JSONException e) {
Log.e(TAG, "Error setting data " + e.toString());
}
}
And postData is:
public static String postData(String url, JSONObject obj) {
// Create a new HttpClient and Post Header
HttpClient httpclient = null;
try {
HttpParams myParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(myParams, 30000);
HttpConnectionParams.setSoTimeout(myParams, 30000);
httpclient = new DefaultHttpClient(myParams);
} catch (Exception e) {
Log.e("POST_DATA", "error in httpConnection");
e.printStackTrace();
}
InputStream is = null;
try {
HttpPost httppost = new HttpPost(url.toString());
//Header here httppost.setHeader();
StringEntity se = new StringEntity(obj.toString());
httppost.setEntity(se);
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
// // Do something with response...
is = entity.getContent();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// convert response to string
BufferedReader reader = null;
String result = null;
try {
reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
result = sb.toString();
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
} finally {
try {
if (reader != null)
reader.close();
if (is != null)
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (result != null) {
try {
#SuppressWarnings("unused")
JSONObject jObjec = new JSONObject(result);
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
}
return result;
}
Hope it helps

Well i actually did HTTP-Post using NameValuePair...... I am showing the code which i use to do an HTTP-Post and then converting the Response into a String
See the below Method code:
public String postData(String url, String xmlQuery) {
final String urlStr = url;
final String xmlStr = xmlQuery;
final StringBuilder sb = new StringBuilder();
Thread t1 = new Thread(new Runnable() {
public void run() {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(urlStr);
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("xml", xmlStr));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
Log.d("Vivek", response.toString());
HttpEntity entity = response.getEntity();
InputStream i = entity.getContent();
Log.d("Vivek", i.toString());
InputStreamReader isr = new InputStreamReader(i);
BufferedReader br = new BufferedReader(isr);
String s = null;
while ((s = br.readLine()) != null) {
Log.d("YumZing", s);
sb.append(s);
}
Log.d("Check Now",sb+"");
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
});
t1.start();
try {
t1.join();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("Getting from Post Data Method "+sb.toString());
return sb.toString();
}

PHP Server not connecting using JSON objects

I am not able to retrieve the data from the server. I am not sure where i have gone wrong in the code..When i run the application, the data from the server is not displayed on the emulator.. The code is given below
private void postData1(){
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(
"http://www.xxxxx.co.uk/NottTest/post.php");
JSONObject json = new JSONObject();
try {
// JSON data:
try {
json.put("name", "Fahmi Rahman");
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
json.put("position", "sysdev");
JSONArray postjson = new JSONArray();
postjson.put(json);
// Post the data:
httppost.setHeader("json", json.toString());
httppost.getParams().setParameter("jsonpost", postjson);
// Execute HTTP Post Request
System.out.print(json);
HttpResponse response = httpclient.execute(httppost);
tv.setText("Hiii");
// for JSON:
if (response != null)
{
Log.i("Json","respose");
System.out.print("loooooooooool");
InputStream is = response.getEntity().getContent();
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();
}
}
text = sb.toString();
}
else{
tv.setText("no respose");
Log.i("Noting","happended");
}
//tv.setText(text);
} catch (ClientProtocolException e) {
Log.i("Error","Prtocol");
} catch (IOException e) {
Log.i("Error","IO");
} catch (JSONException e) {
Log.i("Error","JOSON");
}
}

i think the error is in
try {
json.put("name", "Fahmi Rahman");
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
json.put("position", "sysdev");
JSONArray postjson = new JSONArray();