Java Code Examples for javax.microedition.io.HttpConnection#getHeaderField()

/**
 * @inheritDoc
 */
public String[] getHeaderFields(String name, Object connection) throws IOException {
    HttpConnection c = (HttpConnection) connection;
    Vector r = new Vector();
    int i = 0;
    while (c.getHeaderFieldKey(i) != null) {
        if (c.getHeaderFieldKey(i).equalsIgnoreCase(name)) {
            String val = c.getHeaderField(i);
            r.addElement(val);
        }
        i++;
    }

    if (r.size() == 0) {
        return null;
    }
    String[] response = new String[r.size()];
    for (int iter = 0; iter < response.length; iter++) {
        response[iter] = (String) r.elementAt(iter);
    }
    return response;
}
 

private static String getEncoding(HttpConnection c) throws IOException {
  String enc = "ISO-8859-1";
  String contentType = c.getHeaderField("Content-Type");
  if (contentType != null) {
    String prefix = "charset=";
    int beginIndex = contentType.indexOf(prefix);
    if (beginIndex != -1) {
      beginIndex += prefix.length();
      int endIndex = contentType.indexOf(';', beginIndex);
      if (endIndex != -1) {
        enc = contentType.substring(beginIndex, endIndex);
      } else {
        enc = contentType.substring(beginIndex);
      }
    }
  }
  return enc.trim();
}
 

/**
 * Open a HTTP stream and check its MIME type
 *
 * @param name Resource name
 * @return a http stream and checks the MIME type
 */
private InputStream getHttpInputStream(String name) throws IOException {
	InputConnection ic = (InputConnection) Connector.open(name);
	// Content-Type is available for http and https connections
	if (ic instanceof HttpConnection) {
		HttpConnection hc = (HttpConnection) ic;
		// Check MIME type
		String type = hc.getHeaderField("Content-Type");
		if (type != null &&
				!type.equals("application/m3g") &&
				!type.equals("image/png") &&
				!type.equals("image/jpeg")) {
			throw new IOException("Wrong MIME type: " + type + ".");
		}
	}

	InputStream is;
	try {
		is = ic.openInputStream();
	} finally {
		try {
			ic.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	return is;
}
 

/**
 * Read cookies from the HttpConnection and store them in the cookie jar.
 *
 * @param hcon HttpConnection object
 * @throws IOException
 */
private void readCookies(HttpConnection hcon) throws IOException {
    String headerName = hcon.getHeaderField(0);

    // Loop through the headers, filtering "Set-Cookie" headers
    for (int i = 0; headerName != null; i++) {
        headerName = hcon.getHeaderFieldKey(i);

        if (headerName != null && headerName.toLowerCase().equals("set-cookie")) {
            String cookieContent = hcon.getHeaderField(i);
            COOKIE_JAR.put(cookieContent);
        }
    }
}
 

/**
 * @inheritDoc
 */
public String[] getHeaderFields(String name, Object connection) throws IOException {
    HttpConnection c = (HttpConnection)connection;
    Vector r = new Vector();
    int i = 0;
    while (c.getHeaderFieldKey(i) != null) {
        if (c.getHeaderFieldKey(i).equalsIgnoreCase(name)) {
            String val = c.getHeaderField(i);
            //some J2ME devices such as Nokia send all the cookies in one 
            //header spereated by commas
            if(name.equalsIgnoreCase("Set-Cookie")){
                //it is not possible to simply tokenize on comma, because 
                //the expiration date of each cookie contains a comma, therefore 
                //we temporary remove this comma tokenize all the cookies and then 
                //fixing the comma in the expiration date
                String cookies = "";
                Vector v = StringUtil.tokenizeString(val, ';');
                for (int j = 0; j < v.size(); j++) {
                    String keyval = (String) v.elementAt(j);
                    if(keyval.indexOf("expires") > -1){
                        keyval = StringUtil.replaceAll(keyval, ",", "@__@");
                    }
                    cookies += keyval + ";";
                }
                cookies = cookies.substring(0, cookies.length() - 1);
                
                if(cookies.indexOf(",") > -1){
                   Vector v2 = StringUtil.tokenizeString(cookies, ',');
                    for (int j = 0; j < v2.size(); j++) {
                        String value = (String) v2.elementAt(j);
                        value = StringUtil.replaceAll(value, "@__@", ",");
                        r.addElement(value);
                    }
                }
            }else{
                r.addElement(val);
            }
        }
        i++;
    }
    
    if(r.size() == 0) {
        return null;
    }
    String[] response = new String[r.size()];
    for(int iter = 0 ; iter < response.length ; iter++) {
        response[iter] = (String)r.elementAt(iter);
    }
    return response;
}
 

/**
 * {@inheritDoc}
 */
public void run() {
  try {
    // Visit the original download URL and read the JAD;
    // if the MIDlet-Version has changed, invoke the callback.
    String url = Build.DOWNLOAD_URL;
    String applicationVersion = getApplicationVersion();
    String userAgent = getUserAgent();
    String language = getLanguage();
    for (int redirectCount = 0; redirectCount < 10; redirectCount++) {
      HttpConnection c = null;
      InputStream s = null;
      try {
        c = connect(url);
        c.setRequestMethod(HttpConnection.GET);
        c.setRequestProperty("User-Agent", userAgent);
        c.setRequestProperty("Accept-Language", language);

        int responseCode = c.getResponseCode();
        if (responseCode == HttpConnection.HTTP_MOVED_PERM
            || responseCode == HttpConnection.HTTP_MOVED_TEMP) {
          String location = c.getHeaderField("Location");
          if (location != null) {
            url = location;
            continue;
          } else {
            throw new IOException("Location header missing");
          }
        } else if (responseCode != HttpConnection.HTTP_OK) {
          throw new IOException("Unexpected response code: " + responseCode);
        }
        s = c.openInputStream();
        String enc = getEncoding(c);
        Reader reader = new InputStreamReader(s, enc);
        final String version = getMIDletVersion(reader);
        if (version == null) {
          throw new IOException("MIDlet-Version not found");
        } else if (!version.equals(applicationVersion)) {
          Application application = Application.getApplication();
          application.invokeLater(new Runnable() {
            public void run() {
              mCallback.onUpdate(version);
            }
          });
        } else {
          // Already running latest version
        }
      } finally {
        if (s != null) {
          s.close();
        }
        if (c != null) {
          c.close();
        }
      }
    }
  } catch (Exception e) {
    System.out.println(e);
  }
}