Acceder a páginas web con Java, que tengan login y password

[nup_]

Hola xivela:

El API HTTPClient q te puse sirve para lo q quieres hacer también. De hecho unos de los ejemplos es una autenticación basada en formulario:
http://hc.apache.org/httpcomponents-...FormLogin.java

Me tomé la libertad de modificar un poco ese ejemplo para ajustarlo a tu página. Este es el código:

Código Java:

/*
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 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
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 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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package org.apache.http.examples.client;
 
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.cookie.Cookie;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
 
/**
 * A example that demonstrates how HttpClient APIs can be used to perform
 * form-based logon.
 */
public class ClientFormLogin {
 
    public static void main(String[] args) throws Exception {
 
        System.out.println("Starting");
        
        DefaultHttpClient httpclient = new DefaultHttpClient();
        try {
            HttpGet httpget = new HttpGet("https://www.image.net/xads/actions/login.do");
 
            HttpResponse response = httpclient.execute(httpget);
            HttpEntity entity = response.getEntity();
 
            System.out.println("Login form get: " + response.getStatusLine());
            EntityUtils.consume(entity);
 
            // Mostramos las cookies
            System.out.println("Initial set of cookies:");
            List<Cookie> cookies = httpclient.getCookieStore().getCookies();
            if (cookies.isEmpty()) {
                System.out.println("None");
            } else {
                for (int i = 0; i < cookies.size(); i++) {
                    System.out.println("- " + cookies.get(i).toString());
                }
            }
 
            HttpPost httpost = new HttpPost("https://www.image.net/xads/actions/processlogon.do");
            
            /*
             * Poner aki tus credenciales de autenticación
            */
            String usuario = "usuario";
            String password = "password";
 
            // Variables a mandar
            List <NameValuePair> nvps = new ArrayList <NameValuePair>();
            nvps.add(new BasicNameValuePair("screen", "post_login"));
            nvps.add(new BasicNameValuePair("lang_change", ""));
            nvps.add(new BasicNameValuePair("forward_url", ""));
            nvps.add(new BasicNameValuePair("login", usuario));
            nvps.add(new BasicNameValuePair("password", password));
 
            httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
 
            response = httpclient.execute(httpost);
            entity = response.getEntity();
 
            System.out.println("Login form get: " + response.getStatusLine());
//          EntityUtils.consume(entity);
            
            // Escribimos la respuesta de la página hacia
            //   un outputstream. En este caso: la consola.
            entity.writeTo(System.out);
            
            // Mostramos las cookies
            System.out.println("Post logon cookies:");
            cookies = httpclient.getCookieStore().getCookies();
            if (cookies.isEmpty()) {
                System.out.println("None");
            } else {
                for (int i = 0; i < cookies.size(); i++) {
                    System.out.println("- " + cookies.get(i).toString());
                }
            }
 
        } finally {
            // When HttpClient instance is no longer needed,
            // shut down the connection manager to ensure
            // immediate deallocation of all system resources
            httpclient.getConnectionManager().shutdown();
        }
    }
}
 

Para ejecutarlo necesitas bajar las librerías del HttpClient:
http://apache.mirrors.tds.net//httpc...nt-4.1-bin.zip
y añadir todos los .jar q hayan en la carpeta lib a tu CLASSPATH.

Las URLs del código son las de tu sitio (www.imagen.net) así q si pones bien el user y pass debe funcionar.

saludos;

Nup_