Develop Reference

Java connection with Threads

I want to create an App, it can show the newest movies datas, with trailers from Movie Database
I try to connect url, with threads to search the trailers. But its load only the first 38 connect succes, but i need 60. I have no idea why.
Is anyone has?
P.S.: I am sorry my English
private Thread loadTrailers = new Thread(){
#Override
public void run(){
int counter = 0;
String str = new String("");
BufferedReader br = null;
try { // try open source site
URL url = new URL("https://api.themoviedb.org/3/movie/"+id+"/videos?api_key="+myApikey);
br = new BufferedReader(new InputStreamReader(url.openConnection().getInputStream())); // problem with openConnection()
if(br != null){
if((str = br.readLine()) != null){
String[] moviedatas = str.split("\"id\"");
for(int i = 1; i < moviedatas.length && counter < 3;++i){
Pattern isTrailer = Pattern.compile(".*Trailer.*");
Matcher matc_tr = isTrailer.matcher(moviedatas[i]);
if(matc_tr.matches()){
Pattern getKey = Pattern.compile(".*key\":\"(.*)\",\"name.*");
Matcher key = getKey.matcher(moviedatas[i]);
if(key.matches()){
links.add("https://www.youtube.com/watch?v="+key.group(1));
counter++;
}
}
}
}
}
} catch (MalformedURLException e) {
System.err.println("Invalid URL!");
} catch (IOException e) {
System.err.println("Connection failed from trailers.");
} finally {
try {
if(br != null)
br.close();
} catch (IOException e) {
System.err.println("File close not success.");
}
}
}
};

Android 2.1 appears to not flush output stream

We are getting some very weird behavior in Android. Our network stack (that talks to a REST server) works fine in almost all situations, except when we do a GET shortly after doing a larger POST. What appears to be happening is that the Output stream is not flushing, and ends up sending the last line that was in there when the new socket is opened. Please note, each connection is a new object created, so this is unexpected behavior. First, the error code that seems to point me to the output stream, these are from the server logs.
10.1.8.195 - - [07/Nov/2012:13:36:28 -0700] "POST /iou/lender HTTP/1.1" 200 28 "-" "Android"
10.1.8.195 - - [07/Nov/2012:13:36:36 -0700] "------------V2ymHFg03ehbqgZCaKO6jy" 400 173 "-" "-"
That attempt after should be a GET that then pulls the data from the server that includes the new entry added via the POST. However, all we get is again what appears to be the last line from the output stream from the POST. Here is our core code for the network stack, if more of the surrounding code is needed, let me know.
public Object serverConnect(String url, String method,
Hashtable<String, Object> params) {
HttpConnection c = null;
InputStream is = null;
OutputStream out = null;
ByteArrayOutputStream postDataByteArrayImage = new ByteArrayOutputStream();
byte[] data;
String boundry = "----------V2ymHFg03ehbqgZCaKO6jy";
try {
if (!url.startsWith("/")) {
url = "/" + url;
}
String uri = Control.URL_Secure + Control.dtserver + ":"
+ Control.port + url;
ByteArrayOutputStream postDataByteArray = new ByteArrayOutputStream();
params.put("sessionId", Control.sessionId);
if (method.equals("GET")) {
uri = uri + "?";
Enumeration enumParams = params.keys();
while (enumParams.hasMoreElements()) {
if (!uri.endsWith("?")) {
uri = uri + "&";
}
String key = (String) enumParams.nextElement();
uri = uri
+ key
+ "="
+ java.net.URLEncoder.encode((String) params
.get(key));
}
} else if (method.equals("POST")) {
Enumeration enumParams = params.keys();
postDataByteArray.write(("--").getBytes());
postDataByteArray.write((boundry).getBytes());
postDataByteArray.write(("\r\n").getBytes());
while (enumParams.hasMoreElements()) {
String key = (String) enumParams.nextElement();
if (!key.equals("image")){
postDataByteArray
.write(("Content-Disposition: form-data; name=\"")
.getBytes());
postDataByteArray.write((key).getBytes());
postDataByteArray.write(("\"").getBytes());
postDataByteArray.write(("\r\n\r\n").getBytes());
postDataByteArray.write(((String) params.get(key))
.getBytes());
postDataByteArray.write(("\r\n").getBytes());
postDataByteArray.write(("--").getBytes());
postDataByteArray.write(boundry.getBytes());
postDataByteArray.write(("\r\n").getBytes());
}
}
postDataByteArray.close();
}
Log.i("URL", uri);
URL urltoConenct = new URL(uri);
URLConnection connection = urltoConenct.openConnection();
HttpURLConnection urlConnection = (HttpURLConnection) connection;
URLConnection.setDefaultRequestProperty("Method", method); // default
urlConnection.setRequestProperty("User-Agent", "Android");
if (method.equals("POST")) {
urlConnection.setDoOutput(true);
urlConnection.setFixedLengthStreamingMode(postDataByteArray.toByteArray().length + postDataByteArrayImage.toByteArray().length);
urlConnection.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + boundry);
out = urlConnection.getOutputStream();
out.write(postDataByteArray.toByteArray());
out.write(postDataByteArrayImage.toByteArray());
out.close();
}
int response = 0;
try {
response = urlConnection.getResponseCode();
} catch (IOException e) {
if (e.toString()
.equals("java.io.IOException: Received authentication challenge is null"))
throw new RESTException(401, "Invalid Phone or Pin");
else
throw e;
}
if (response == HttpURLConnection.HTTP_OK) {
is = urlConnection.getInputStream();
if (is == null) {
return new IOException(
"Cannot open HTTP InputStream, aborting");
}
ByteArrayOutputStream bo = new ByteArrayOutputStream();
int ch;
int count = 0;
while ((ch = is.read()) != -1) {
bo.write(ch);
count++;
}
data = bo.toByteArray();
return new String(data);
} else if (response == 500) {
return new RESTException(500, "Internal server error");
} else {
RESTException x = new RESTException();
x.setCode(response);
try {
is = urlConnection.getInputStream();
if (is == null) {
x.setMessage("Unable to retrieve message");
return x;
}
ByteArrayOutputStream bo = new ByteArrayOutputStream();
int ch;
int count = 0;
while ((ch = is.read()) != -1) {
bo.write(ch);
count++;
}
data = bo.toByteArray();
String output = new String(data);
JSONObject obj;
try {
obj = new JSONObject(output);
JSONObject err = obj.getJSONArray("errors")
.getJSONObject(0);
x.setMessage(err.getString("message"));
} catch (JSONException e) {
Log.e("stuff", output);
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e) {
// Damn you android! I'm using a REST service here, stop
// trying to interpret my errors!
x.setMessage("Unable to retrieve message");
}
return x;
}
} catch (Exception x) {
x.printStackTrace();
/*
* if (!retried && x.toString().equals(
* "java.io.IOException: Persistent connection dropped after first chunk sent, cannot retry"
* )) { retry = true; } if (!retry) { return x; }
*/
return x;
} finally {
try {
out.close();
} catch (Exception x) {
}
try {
is.close();
} catch (Exception x) {
}
try {
c.close();
} catch (Exception x) {
}
params.clear();
}
// return null;
}

After a very long time of frustration, we discovered that Android tries to keep a connection alive even if you manually call .close() on the connection. This worked fine for our GET methods, but POST methods left the socket in a state that it couldn't then process a GET. Adding the following fixed all our problems:
urlConnection.setRequestProperty("connection", "close");

How to Ping WSDL in Java

How can I execute a Ping for my WSDL in Java?
I already tried this:
InetAddress.getByname(my_wsdl).isReachable(3000);
but didn't work.

Try this
private boolean isWSDLAvailable(String wsdlAddr) {
HttpURLConnection c = null;
try {
URL u = new URL(wsdlAddr);
c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("HEAD");
c.getInputStream();
return c.getResponseCode() == 200;
} catch (Exception e) {
return false;
} finally {
if (c != null) c.disconnect();
}
}

HttpConnection through GPRS (Mobile Network)

I tried to make HttpConnection of URL through GPRS (Mobile network) on real device but it doesn't return data, but I the same code working well through wireliess, the code also working well on simulator
My code is
public static String getHttpUTFResponse(String url) {
HttpConnection connection = null;
byte responseData[] = null;
try {
connection = (HttpConnection) new ConnectionFactory()
.getConnection(url).getConnection();
int len = (int) connection.getLength();
System.out.println(len);
if (len != -1) {
responseData = new byte[len];
DataInputStream dis;
dis = new DataInputStream(connection.openInputStream());
dis.readFully(responseData);
dis.close();
}
} catch (IOException e) {
System.out.println("Connection Error");
} finally {
if (connection != null) {
try {
connection.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
connection = null;
}
}
if (responseData != null) {
try {
return new String(responseData,"UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return null;
}
} else {
return null;
}
}
Note: the device browser working well and BB service was registered
Thanks to any one

I am moving my comments to these answer:
In Blackberry setting up the connection url for wireless / gprs / 3g / simulator is pretty challenging, please follow the below pointers
For WiFi on device, make sure you have suffixed ";interface=wifi" to the connection url
For GPRS / 3G on device, make sure you have suffixed ";deviceside=false;connectionUID=" for BIS and ";deviceside=false" for BES to the connection URL
More descriptive explanation can be found at:
Need Clarification ---- Http Connection/GPRS
How to configure an IT Policy on the BlackBerry Enterprise Server to allow only the Internet Browser on the BlackBerry smartphone
Internet Connectivity (APN?)
Tag: APN
Different ways to make an HTTP or socket connection
EDIT: Link 5 was useful for OP

try this..
this will help you to detect the simulator, wifi and gprs connection
getWap2Uid();
String url = "your url";
if(DeviceInfo.isSimulator() == true)
{
conn = (StreamConnection) Connector.open(url+ ";deviceside=true");
}
else
{
if (uid != null)
{
//open a WAP 2 connection
conn = (StreamConnection) Connector.open(url + ";deviceside=true;ConnectionUID=" + uid);
}
else
{
//Consider another transport or alternative action.
conn = (StreamConnection) Connector.open(url +";deviceside=true;interface=wifi");
}
}
getWap2Uid function is here
public static String uid ;
static String getWap2Uid() {
ServiceRecord[] records = ServiceBook.getSB().findRecordsByCid("WPTCP");
for (int i = 0; i < records.length; i++)
{
ServiceRecord serviceRecord = records[i];
String recordName = serviceRecord.toString().toUpperCase();
if (serviceRecord.isValid() && !serviceRecord.isDisabled() &&
serviceRecord.getUid() != null && serviceRecord.getUid().length() != 0 &&
recordName.indexOf("WAP2")!=-1)
{
uid = serviceRecord.getUid();
EventLogger.logEvent(EventLogID, new String("getWap2Uid, UID="+uid).getBytes() );
return uid;
}
}
return null;
}

how to resume an interrupted download

I'm trying to download a large file from my Yahoo! web site server which apparently is setup (not by me) to disconnect downloads if they are not completed within 100 seconds. The file is small enough to usually successfully transfer. On the occasions when the data rate is slow and the download gets disconnected, is there a way to resume the URLConnection at the file offset where the disconnection occurred? Here's the code:
// Setup connection.
URL url = new URL(strUrl[0]);
URLConnection cx = url.openConnection();
cx.connect();
// Setup streams and buffers.
int lengthFile = cx.getContentLength();
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(strUrl[1]);
byte data[] = new byte[1024];
// Download file.
for (total=0; (count=input.read(data, 0, 1024)) != -1; total+=count) {
publishProgress((int)(total*100/lengthFile));
output.write(data, 0, count);
Log.d("AsyncDownloadFile", "bytes: " + total);
}
// Close streams.
output.flush();
output.close();
input.close();

Try using a "Range" request header:
// Open connection to URL.
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
// Specify what portion of file to download.
connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
// here "downloaded" is the data length already previously downloaded.
// Connect to server.
connection.connect();
Having done that, you can seek at a given point (just before the length of your download data, say X) and start writing the newly downloaded data there. Be sure to use the same value X for the range header.
Details about 14.35.2 Range Retrieval Requests
More details and source code can be found here

Here's an example code that you can use:
import java.io.*;
import java.net.*;
public class HttpUrlDownload {
public static void main(String[] args) {
String strUrl = "http://VRSDLSCEN001:80//DLS//lib//clics.jar";
String DESTINATION_PATH = "clics.jar";
int count = 0;
while (true) {
count++;
if (download(strUrl, DESTINATION_PATH) == true || count > 20) {
break;
}
}
}
public static boolean download(String strUrl, String DESTINATION_PATH) {
BufferedInputStream in = null;
FileOutputStream fos = null;
BufferedOutputStream bout = null;
URLConnection connection = null;
int downloaded = 0;
try {
System.out.println("mark ... download start");
URL url = new URL(strUrl);
connection = url.openConnection();
File file=new File(DESTINATION_PATH);
if(file.exists()){
downloaded = (int) file.length();
}
if (downloaded == 0) {
connection.connect();
}
else {
connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
connection.connect();
}
try {
in = new BufferedInputStream(connection.getInputStream());
} catch (IOException e) {
int responseCode = 0;
try {
responseCode = ((HttpURLConnection)connection).getResponseCode();
} catch (IOException e1) {
e1.printStackTrace();
}
if (responseCode == 416) {
return true;
} else {
e.printStackTrace();
return false;
}
}
fos=(downloaded==0)? new FileOutputStream(DESTINATION_PATH): new FileOutputStream(DESTINATION_PATH,true);
bout = new BufferedOutputStream(fos, 1024);
byte[] data = new byte[1024];
int x = 0;
while ((x = in.read(data, 0, 1024)) >= 0) {
bout.write(data, 0, x);
}
in.close();
bout.flush();
bout.close();
return false;
} catch (IOException e) {
e.printStackTrace();
return false;
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
}
}
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
}
}
if (bout != null) {
try {
bout.close();
} catch (IOException e) {
}
}
if (connection != null) {
((HttpURLConnection)connection).disconnect();
}
}
}
}