remcovg
Gebruiker
- Lid geworden
- 25 jun 2006
- Berichten
- 205
Mensjes,
Ik had laatst het plan om een applicatie te schrijven waarmee ik mijn (school)rooster op mijn telefoon kan ophalen. Mijn telefoon ondersteund java ( lg kp500 ). Maar omdat ik de SDK van LG nogal een beetje ingewikkeld vond wou ik het eerst in een windows applicatie maken.
Op de schoolsite moet eerst worden ingelogd voor je je rooster kan bekijken vanwege een of andere reden
. dus moest ik een nieuw script schrijven. Maar ik krijg mijn post niet goed voor elkaar om in te loggen. wat doe ik hier fout? onderstaand staat me code
.
Bij voorbaat dank :thumb:!
Gr,
Remco
edit: wachtwoord en gebruikersnaam heb ik natuurlijk even weggehaald
Ik had laatst het plan om een applicatie te schrijven waarmee ik mijn (school)rooster op mijn telefoon kan ophalen. Mijn telefoon ondersteund java ( lg kp500 ). Maar omdat ik de SDK van LG nogal een beetje ingewikkeld vond wou ik het eerst in een windows applicatie maken.
Op de schoolsite moet eerst worden ingelogd voor je je rooster kan bekijken vanwege een of andere reden
Bij voorbaat dank :thumb:!
Gr,
Remco
Code:
package roosterapp;
/**
*
* @author Gri-Com
*/
import java.net.*;
import java.io.*;
public class LoginByHttpPost
{
private static final String POST_CONTENT_TYPE = "application/x-www-form-urlencoded";
private static final String LOGIN_ACTION_NAME = "cmdLogin";//login
private static final String LOGIN_USER_NAME_PARAMETER_NAME = "txtUserName"; // user_name
private static final String LOGIN_PASSWORD_PARAMETER_NAME = "txtPassword"; //user_pass
private static final String LOGIN_USER_NAME = "";
private static final String LOGIN_PASSWORD = "";
private static final String TARGET_URL = "https://orkp.avans.nl/login.asp?comebackto=/index.asp?";
public static void main (String args[])
{
LoginByHttpPost httpUrlBasicAuthentication = new LoginByHttpPost();
httpUrlBasicAuthentication.httpPostLogin();
}
/**
* The single public method of this class that
* 1. Prepares a login message
* 2. Makes the HTTP POST to the target URL
* 3. Reads and returns the response
*
* @throws IOException
* Any problems while doing the above.
*
*/
public void httpPostLogin ()
{
try
{
// Prepare the content to be written
// throws UnsupportedEncodingException
String urlEncodedContent = preparePostContent(LOGIN_USER_NAME, LOGIN_PASSWORD);
HttpURLConnection urlConnection = doHttpPost(TARGET_URL, urlEncodedContent);
String response = readResponse(urlConnection);
System.out.println("Successfully made the HTTP POST.");
System.out.println("Recevied response is: '/n" + response + "'");
}
catch(IOException ioException)
{
System.out.println("Problems encounterd.");
}
}
/**
* Using the given username and password, and using the static string variables, prepare
* the login message. Note that the username and password will encoded to the
* UTF-8 standard.
*
* @param loginUserName
* The user name for login
*
* @param loginPassword
* The password for login
*
* @return
* The complete login message that can be HTTP Posted
*
* @throws UnsupportedEncodingException
* Any problems during URL encoding
*/
private String preparePostContent(String loginUserName, String loginPassword) throws UnsupportedEncodingException
{
// Encode the user name and password to UTF-8 encoding standard
// throws UnsupportedEncodingException
String encodedLoginUserName = URLEncoder.encode(loginUserName, "UTF-8");
String encodedLoginPassword = URLEncoder.encode(loginPassword, "UTF-8");
String content = "login.asp?comebackto=/index.asp?=" + LOGIN_ACTION_NAME +" &" + LOGIN_USER_NAME_PARAMETER_NAME +"="
+ encodedLoginUserName + "&" + LOGIN_PASSWORD_PARAMETER_NAME + "=" + encodedLoginPassword;// cmdLogin == login == login.asp?comebackto=/index.asp?
return content;
}
/**
* Makes a HTTP POST to the target URL by using an HttpURLConnection.
*
* @param targetUrl
* The URL to which the HTTP POST is made.
*
* @param content
* The contents which will be POSTed to the target URL.
*
* @return
* The open URLConnection which can be used to read any response.
*
* @throws IOException
*/
public HttpURLConnection doHttpPost(String targetUrl, String content) throws IOException
{
HttpURLConnection urlConnection = null;
DataOutputStream dataOutputStream = null;
try
{
// Open a connection to the target URL
// throws IOException
urlConnection = (HttpURLConnection)(new URL(targetUrl).openConnection());
// Specifying that we intend to use this connection for input
urlConnection.setDoInput(true);
// Specifying that we intend to use this connection for output
urlConnection.setDoOutput(true);
// Specifying the content type of our post
urlConnection.setRequestProperty("Content-Type", POST_CONTENT_TYPE);
// Specifying the method of HTTP request which is POST
// throws ProtocolException
urlConnection.setRequestMethod("POST");
// Prepare an output stream for writing data to the HTTP connection
// throws IOException
dataOutputStream = new DataOutputStream(urlConnection.getOutputStream());
// throws IOException
dataOutputStream.writeBytes(content);
dataOutputStream.flush();
dataOutputStream.close();
return urlConnection;
}
catch(IOException ioException)
{
System.out.println("I/O problems while trying to do a HTTP post.");
ioException.printStackTrace();
// Good practice: clean up the connections and streams
// to free up any resources if possible
if (dataOutputStream != null)
{
try
{
dataOutputStream.close();
}
catch(Throwable ignore)
{
// Cannot do anything about problems while
// trying to clean up. Just ignore
}
}
if (urlConnection != null)
{
urlConnection.disconnect();
}
// throw the exception so that the caller is aware that
// there was some problems
throw ioException;
}
}
/**
* Read response from the URL connection
*
* @param urlConnection
* The URLConncetion from which the response will be read
*
* @return
* The response read from the URLConnection
*
* @throws IOException
* When problems encountered during reading the response from the
* URLConnection.
*/
private String readResponse(HttpURLConnection urlConnection) throws IOException
{
BufferedReader bufferedReader = null;
try
{
// Prepare a reader to read the response from the URLConnection
// throws IOException
bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
String responeLine;
// Good Practice: Use StringBuilder in this case
StringBuilder response = new StringBuilder();
// Read untill there is nothing left in the stream
// throws IOException
while ((responeLine = bufferedReader.readLine()) != null)
{
response.append(responeLine);
}
return response.toString();
}
catch(IOException ioException)
{
System.out.println("Problems while reading the response");
ioException.printStackTrace();
// throw the exception so that the caller is aware that
// there was some problems
throw ioException;
}
finally
{
// Good practice: clean up the connections and streams
// to free up any resources if possible
if (bufferedReader != null)
{
try
{
// throws IOException
bufferedReader.close();
}
catch(Throwable ignore)
{
// Cannot do much with exceptions doing clean up
// Ignoring all exceptions
}
}
}
}
}
edit: wachtwoord en gebruikersnaam heb ik natuurlijk even weggehaald
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