相关疑难解决方法(0)

我正在尝试用Java创建我的第一个程序.目标是编写一个浏览网站并为我下载文件的程序.但是,我不知道如何使用Java与互联网进行交互.谁能告诉我哪些主题可以查找/阅读或推荐一些好的资源？

我想访问网站https://myoffice.bt.com的某些页面,这需要使用java进行用户身份验证.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 …