You need two changes for your code to work:
1 - You need to pick up the cookie returned by the second call (the download of the image) and add it to previous cookie.
2 - If you see the field "j1643f05a0c7fc7910424fb3fc4fbbb6f" is very suspicious, in fact that field is variable, you will need to pick the hidden input in the form and use it.
3 (extra) - It is not the case but some servers complain if you don't send some headers, like Accept, Accept-Encoding, Accept-Language ...
When I use your code with those changes I get :
<script>alert('Incorrect username or password. Please try again.'); window.history.go(-1);</script>
Of course I don't have a user/pass, I think you'll get the desired page.
The code with the neccesary changes is:
public class SO_28619161 {
public Map cookies;
private String username = "u";
private String password = "p";
public HashMap<String,String> downloadCaptcha()throws Exception {
Connection.Response response = Jsoup.connect("https://academics.ddn.upes.ac.in/upes/")
.timeout(300000)
.userAgent("Mozilla/5.0")
.method(Connection.Method.GET).execute();
//nice
cookies = response.cookies();
//now we will load form's inputs
Document doc = response.parse();
Elements fields = doc.select("form input");
HashMap<String,String> formFields = new HashMap<String, String>();
for (Element field : fields ){
formFields.put(field.attr("name"), field.attr("value"));
}
Connection.Response resultImageResponse = Jsoup.connect("https://academics.ddn.upes.ac.in/upes/modules/create_image.php")
.cookies(cookies)
.ignoreContentType(true)
.method(Connection.Method.GET).timeout(30000).execute();
//we will need these cookies also!
cookies.putAll(resultImageResponse.cookies());
FileOutputStream out = (new FileOutputStream(new java.io.File("abc.jpg")));
out.write(resultImageResponse.bodyAsBytes());
out.close();
System.out.println("Captcha Fetched");
return formFields;
}
public void getData(HashMap<String, String> formFields) throws Exception{
Connection conn = Jsoup.connect("https://academics.ddn.upes.ac.in/upes/index.php")
.userAgent("Mozilla/5.0 (Windows NT 6.1; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0")
//not neccesary but these extra headers won't hurt
.header("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
.header("Accept-Encoding", "gzip, deflate")
.header("Accept-Language", "es-ES,es;q=0.8,en-US;q=0.5,en;q=0.3")
.header("Host", "academics.ddn.upes.ac.in")
.header("Referer", "https://academics.ddn.upes.ac.in/upes/index.php")
.cookies(cookies)
.timeout(0)
.method(Connection.Method.POST);
//we send the fields
conn.data(formFields);
Response response = conn.execute();
cookies = response.cookies();
System.out.println(response.cookies());
Document doc= response.parse();
FileWriter fr = new FileWriter("response.html");
PrintWriter pw= new PrintWriter(fr);
pw.println(doc.toString());
System.out.println(doc.toString());
pw.close();
fr.close();
}
private void run() throws Exception, IOException {
HashMap<String, String> formFields = downloadCaptcha();
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String captcha = br.readLine();
//we set user/pass and captcha
formFields.put("username", username);
formFields.put("passwd", password);
formFields.put("txtCaptcha", captcha);
getData(formFields);
}
public static void main(String[] args) throws Exception {
SO_28619161 main = new SO_28619161();
main.run();
}
}
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