Login to a website through java

Hello there.
I have been tinkering with an idea to make life easier for me in the long run whice should result in a java program which can sorte data from a website to make it easily accesable (then it is now)
Now my problem is that i have no idea how to do this. I have the idea how to make it work, but non of the know-how to do it.
So, i was wondering if any of you fellas could help out.
My main problem is to make my java program submit a form to this site http://dkp.sigma-seven.org/login.php?s=6c0dc063823f2ce37a3dcd3e511e5cdf to make it able to login to the site.
From there i should be able to pluck out the information i need to my java program.
My question is:
I have been trying to read up on the java POST HTTP request information i could find on the net, but non of it actually contained the information i neede: What is neede to submit a password and username to this particularly site? (i would like to know how to aim code at the textfields and how to specific target the Login button)
Thanks in advance - Rasmus

Read up on HTML. Basically there's a form there (presumably). The form has an "action", which is a URL to send data to, and the browser sends data to that URL. The data are the key/value pairs defined in the form. You don't actually "aim" code at the text fields or the submit button. The submit button just says to submit the form to the action URL (and it might contain some additional data itself) and the textfields are just names for the values. You need to divorce your idea of a form as living in the browser's GUI, from the idea of a form as a collection of name/value pairs.
The best thing you can do is read about HTML and in particular forms, and about HTTP, in particular, the POST method, and URL-encoding.

Similar Messages

How can i login to a website using java

hi,
i tried to write a java program to which will take username and password and login to a given site. but some how its not working. i am actually trying to login to the follwoing website:
https://roundup.ffmpeg.org/roundup/ffmpeg/
can anyone provide some example program to login to this website.
br
mahbubul-syeed

Hi,
i am really sorry... but i am new in this forum and i did not know this. here is my code that i have written. it did not show any error and displays the content of the page but did not logged in. please give your comment.. i badly need a solution.
package myUtility_files;
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 = "submit";
private static final String LOGIN_USER_NAME_PARAMETER_NAME = "__login_name";
private static final String LOGIN_PASSWORD_PARAMETER_NAME = "__login_password";
private static final String LOGIN_USER_NAME = "mahbubul";
private static final String LOGIN_PASSWORD = "mahbubul007";
private static final String TARGET_URL = "http://roundup.ffmpeg.org/roundup/ffmpeg/";
public static void main (String args[])
LogInByHttpPost httpUrlBasicAuthentication = new LogInByHttpPost();
httpUrlBasicAuthentication.httpPostLogin();
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 HTPP POST.");
//System.out.println("Recevied response is: '/n" + response + "'");
BufferedReader in = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
               String inputLine;
               while ((inputLine = in.readLine()) != null)
                    System.out.println(inputLine);
catch(IOException ioException)
     ioException.printStackTrace();
System.out.println("Problems encounterd.");
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=" + LOGIN_ACTION_NAME +" &" + LOGIN_USER_NAME_PARAMETER_NAME +"="
+ encodedLoginUserName + "&" + LOGIN_PASSWORD_PARAMETER_NAME + "=" + encodedLoginPassword;
return content;
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;
br
mahbubul-syeed
Edited by: mahbubul-syeed on Jun 11, 2009 5:07 AM

POSTing to a website through HTML form

Hello,
I've been trying to write a program that accesses a website that requires you to login first.
Here's the core of my code:
     try{
               BufferedReader in = new BufferedReader(new InputStreamReader(site.openStream()));
               OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream());
               out.write("user=user&pass=pass");
               String inputLine;
               while ((inputLine = in.readLine()) != null){
                    System.out.println(inputLine);
               out.close();
          catch(IOException e){
               System.out.println("Could not read from site: " + e.getMessage());
          }Everything works as assumed, no error messages what so ever, but the output read from System.out.println still gives me the invalid login message.
This is my first time venturing into the POST subject through JAVA, so I'm not sure how to check where to error lies. Any ideas?
The user and pass are valid. The website gives the invalid login message when no fields are entered as well.

I think the problem is with
out.write("user=user&pass=pass");The variables user, pass depends on what the website's login script requires i.e. your website's login script could be expect parameters username, password.
Check this article for more information on doing something like this ( [log in to a website using HTTP POST|http://www.1your.com/drupal/LoginToWebsiteByHTTPPOST] ). This article also points to a sample login script you can run this code against.
Hope this helps,
[email protected]

Logging in on website using java

Hello,
I am quite inexperienced when it comes to java programming, so my apologies if I post this in the wrong section.
I am trying to open a website using java. So far I succeeded in reading the source code through java, which is about halfway I want to get. However, for getting the information I want, I need to login on the website with my account. I have no idea how something like that should be done. Cookies are used to login, and I am using BlueJ for my program. Could anyone help me out with an example or explanation on how this is done?
Thanks in advance,
Tybs

I downloaded the httpclient tool, it looks promising. I managed to open it in blueJ, so far so good... the only problem now is that I can't compile it. Each class gives me an error message. This one, for example:
import test.com.meterware.httpunit.*;
package test.com.meterware.httpunit does not exist
I found the necessary packages in the tool itself, but I have no idea how I can specify the path to them, or how I can add them to the packages that java already has. What do I need to do for this?
Thanks for the information so far, it really helps :D
Greetz,
Tybs

Need Help-How Store the input parameter through java bean

Hello Sir,
I have a simple Issue but It is not resolve by me i.e input parameter
are not store in Ms-Access.
I store the input parameter through Standard Action <jsp:useBean>.
jsp:useBean call a property IssueData. this property exist in
SimpleBean which create a connection from DB and insert the data.
At run time servlet and server also show that loggging are saved in DB.
But when I open the table in Access. Its empty.
Ms-Access have two fields- User, Password both are text type.
Please review these code:
login.html:
<html>
<head>
<title>A simple JSP application</title>
<head>
<body>
<form method="get" action="tmp" >
Name: <input type="text" name="user">
Password: <input type="password" name="pass">
<input type="Submit" value="Submit">
</form>
</body>
</html>LoginServlet.java:
import javax.servlet.*;
import javax.servlet.http.*;
public class LoginServlet extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException{
try
String user=request.getParameter("user");
String pass=request.getParameter("pass");
co.SimpleBean st = new co.SimpleBean();
st.setUserName(user);
st.setPassword(pass);
request.setAttribute("user",st);
request.setAttribute("pass",st);
RequestDispatcher dispatcher1 =request.getRequestDispatcher("submit.jsp");
dispatcher1.forward(request,response);
catch(Exception e)
e.printStackTrace();
}SimpleBean.java:
package co;
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
public class SimpleBean {
private String user="";
private String pass="";
private String s="";
public String getUserName() {
return user;
public void setUserName(String user) {
this.user = user;
public String getPassword() {
return pass;
public void setPassword(String pass) {
this.pass = pass;
public String getIssueData() //method that create connection with database
try
System.out.println("Printed*************************************************************");
getUserName();
getPassword();
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("Loading....");
Connection con=DriverManager.getConnection("jdbc:odbc:simple");
System.out.println("Connected....");
PreparedStatement st=con.prepareStatement("insert into Table1 values(?,?)");
System.out.println("~~~~~~~~~~~~~~~~~~~~");
String User=getUserName();
st.setString(1,User);
String Password=getPassword();
st.setString(2,Password);
st.executeUpdate();
System.out.println("Query Executed");
con.close();
s= "Your logging is saved in DB ";
System.out.println("Your logging is saved in DB *****************");
return(s);
catch(Exception e)
e.printStackTrace();
return "failed";
}submit.jsp:
This is Submit page
<html><body>
Hello
Student Name: <%= ((co.SimpleBean)request.getAttribute("user")).getUserName() %>
<br>
Password: <%= ((co.SimpleBean)request.getAttribute("pass")).getPassword() %>
<br>
<jsp:useBean id="st" class="co.SimpleBean" scope="request" />
<jsp:getProperty name="st" property="IssueData" />
</body></html>web.xml:<web-app>
<servlet>
<servlet-name>one</servlet-name>
<servlet-class>LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>one</servlet-name>
<url-pattern>/tmp</url-pattern>
</servlet-mapping>
<jsp-file>issue.jsp</jsp-file>
<jsp-file>submit.jsp</jsp-file>
<url-pattern>*.do</url-pattern>
<welcome-file-list>
<welcome-file>Login.html</welcome-file>
</welcome-file-list>
</web-app>Please Help me..Thanks.!!!
--

Dear Sir,
Same issue is still persist. Input parameter are not store in database.
After follow your suggestion when I run this program browser show that:i.e
This is Submit page Hello Student Name: vijay
Password: kumar
<jsp:setProperty name="st" property="userName" value="userValue/> Your logging is saved in DB
Please review my code.
login.html:
{code}<html>
<head>
<title>A simple JSP application</title>
<head>
<body>
<form method="get" action="tmp" >
Name: <input type="text" name="user">
Password: <input type="password" name="pass">
<input type="Submit" value="Submit">
</form>
</body>
</html>{code}
LoginServlet.java:
{code}import javax.servlet.*;
import javax.servlet.http.*;
public class LoginServlet extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException{
try
String userValue=request.getParameter("user");
String passValue=request.getParameter("pass");
co.SimpleBean st = new co.SimpleBean();
st.setuserName(userValue);
st.setpassword(passValue);
request.setAttribute("userValue",st);
request.setAttribute("passValue",st);
RequestDispatcher dispatcher1 =request.getRequestDispatcher("submit.jsp");
dispatcher1.forward(request,response);
catch(Exception e)
e.printStackTrace();
}{code}
SimpleBean.java:
{code}package co;
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
public class SimpleBean {
private String userValue="";
private String passValue="";
private String s="";
public String getuserName() {
return userValue;
public void setuserName(String userValue) {
this.userValue = userValue;
public String getpassword() {
return passValue;
public void setpassword(String passValue) {
this.passValue= passValue ;
public String getissueData() //method that create connection with database
try
System.out.println("Printed*************************************************************");
getuserName();
getpassword();
Class.forName("oracle.jdbc.driver.OracleDriver");
System.out.println("Connection loaded");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@VijayKumar-PC:1521:XE","SYSTEM","SYSTEM");
System.out.println("Connection created");
PreparedStatement st=con.prepareStatement("insert into vij values(?,?)");
System.out.println("~~~~~~~~~~~~~~~~~~~~");
String userName=getuserName();
st.setString(1,userName);
String password=getpassword();
st.setString(2,password);
st.executeUpdate();
System.out.println("Query Executed");
con.close();
s= "Your logging is saved in DB ";
System.out.println("Your logging is saved in DB *****************");
return(s);
catch(Exception e)
e.printStackTrace();
return "failed";
}{code}
submit.jsp:
{code}This is Submit page
<html><body>
Hello
Student Name: <%= ((co.SimpleBean)request.getAttribute("userValue")).getuserName() %>
<br>
Password: <%= ((co.SimpleBean)request.getAttribute("passValue")).getpassword() %>
<br>
<jsp:useBean id="st" class="co.SimpleBean" scope="request" />
<jsp:setProperty name="st" property="userName" value="userValue/>
<jsp:setProperty name="st" property="password" value="passValue"/>
<jsp:getProperty name="st" property="issueData" />
</body></html>web.xml:<web-app>
<servlet>
<servlet-name>one</servlet-name>
<servlet-class>LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>one</servlet-name>
<url-pattern>/tmp</url-pattern>
</servlet-mapping>
<jsp-file>submit.jsp</jsp-file>
<url-pattern>*.do</url-pattern>
<welcome-file-list>
<welcome-file>Login.html</welcome-file>
</welcome-file-list>
</web-app>Sir I can't use EL code in jsp because I use weblogic 8.1 Application Server.This version are not supported to EL.
Please help me...How store th input parameter in Database through Java Bean

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I want to store the request parameter in database through Java Bean.Allthough program are properly run but value are not store in DB.
Here My code:
Login.html:<html>
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<head>
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Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
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<% obj.show();%>
<%
out.println("Ur data is saved in DB");
%>Please Help me.
Thanks.

The issue is in the naming of your fields.
Change User -> user and Pass->pass
Name: <input type="text" name="user">
Password: <input type="password" name="pass">

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Login to a website through java

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