Java上的HTML身份验证不起作用

Question

I am trying to send a website my username or password using some jar file from Apache and trying to read everything from the website with the help of my method "loadpage".

It doesn't work. After I execute my method "loadpage". I still get the Streams from the main page, which I don't need to be logged in. I want to have Streams after i am logged in.

  public static void main(String[] args) throws Exception {
        DefaultHttpClient httpclient = new DefaultHttpClient();
        try {
            httpclient.getCredentialsProvider().setCredentials(
                    new AuthScope("https://justawebsite", 8080),
                    new UsernamePasswordCredentials("username","password"));

            HttpGet httpget = new HttpGet("https://justawebsite");

            System.out.println("executing request" + httpget.getRequestLine());
            HttpResponse response = httpclient.execute(httpget);
            HttpEntity entity = response.getEntity();

            System.out.println("----------------------------------------");
            System.out.println(response.getStatusLine());
            if (entity != null) {
                System.out.println("Response content length: " + entity.getContentLength());
            }
            EntityUtils.consume(entity);
        } finally {
            httpclient.getConnectionManager().shutdown();
        }
    }

I tried it also without the help of some jarfile from Apache.

public  void LogIn(String url1) throws Exception{
        URL url = new URL(url1);

        String userPassword = "username"+":"+"password";
        String encoding = new sun.misc.BASE64Encoder().encode (userPassword.getBytes());
        //con.setRequestProperty("Cookie", "JSESSIONID="+getSid());

        URLConnection con = url.openConnection();
        //con.connect();
        con.setRequestProperty("Cookie", "JSESSIONID=" + encoding);


        con.connect();

    }

My Method Loadpage: it works because I tried it with some other websites, which don't need an authentication.

public String loadPage(String url) throws Exception {

    URLConnection con = new URL(url).openConnection();
    StringBuilder buffer = new StringBuilder();

    BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
    String line;
    while((line=in.readLine())!= null){
        buffer.append(line);
    }
    in.close();
    return buffer.toString();

}

Answer 1

You should first check which authentication type is the website using as pointed out by Behe, as there are different Web Authentication Types .

Your first example is using Basic Authentication, but the website is probably expecting some kind of Form Based Authentication.

If latest is your case, you should check this Client HTTP Programming Primer which includes

• enter username and password in a web form and hit the "login" button

Answer 2

Actuualy what i did was correct. I found the Solution just with luck.I don't know why, but i had to write in.readLine(); one time before the

in.readLine();

while((line=in.readLine()) != null){
buffer.append(line);
}
in.close()

to get the Streams after i was logged in. If i dont do this line before While.. i get the Streams before i was logged in, allthough i was logged in.