我想访问一些需要使用java进行用户身份验证的网站

https://myoffice.bt.com页面.我们必须先登录才能访问页面.我有以下代码的wriiten.

package root;

import java.io.IOException;

import org.apache.commons.httpclient.HttpClient;

import org.apache.commons.httpclient.UsernamePasswordCredentials;

import org.apache.commons.httpclient.auth.AuthScope;

import org.apache.commons.httpclient.methods.PostMethod;

import org.apache.commons.httpclient.params.HttpMethodParams;

public class Url

{

public static void main(String[] args) throws IOException

{

HttpClient client = new HttpClient();

client.getParams().setParameter(

HttpMethodParams.USER_AGENT,

"Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2"

);

client.getState().setCredentials(

new AuthScope("https://myoffice.bt.com", 443, AuthScope.ANY_REALM),

new UsernamePasswordCredentials("username", "password") );

PostMethod get = new PostMethod("https://myoffice.bt.com/youraccount/default.aspx");

get.setDoAuthentication( true );

System.out.println(get.getFollowRedirects());

//get.setFollowRedirects(true);

try {

// execute the GET

int status = client.executeMethod( get );

// print the status and response

System.out.println(status + "\n" + get.getResponseBodyAsString());

} finally {

// release any connection resources used by the method

get.releaseConnection();

}

}

}

但它给出了以下错误.

> Jun 22, 2010 12:14:40 PM org.apache.commons.httpclient.HttpMethodDirector isRedirectNeeded

INFO: Redirect requested but followRedirects is disabled

302

如果我取消注释get.setFollowingRedirects行,则会出现另一个错误.

Exception in thread "main" java.lang.IllegalArgumentException: Entity enclosing requests cannot be redirected without user intervention

at org.apache.commons.httpclient.methods.EntityEnclosingMethod.setFollowRedirects(Unknown Source)

at root.Url.main(Url.java:30)

有人能帮我一下吗？我们可以使用HttpClient进行基于表单的身份验证吗？

谢谢.