为什么没有调用getPasswordAuthentication()？

Question

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.Authenticator;
import java.net.MalformedURLException;
import java.net.PasswordAuthentication;
import java.net.URL;

import sun.net.www.protocol.http.AuthCacheImpl;
import sun.net.www.protocol.http.AuthCacheValue;



public class RunHttpSpnego {
  public static void main(String args[]) throws MalformedURLException,
      IOException {
    String urlString = "http://www.yahoo.com";
    String username = "XXXXXXXXX";
    String password = "XXXXXXXX";
     // This is modified after the question is being asked. Now this code works fine
     System.setProperty("http.proxyHost","176.x.xx.xx") ;
    System.setProperty("http.proxyPort", "8080") ;

    Authenticator.setDefault(new MyAuthenticator(username, password));


    URL url = new URL(urlString);
    InputStream content = (InputStream) url.getContent();
    BufferedReader in = new BufferedReader(new InputStreamReader(content));
    String line;
    while ((line = in.readLine()) != null) {
      System.out.println(line);
    }
    System.out.println("Done.");
  }

  static class MyAuthenticator extends Authenticator {
    private String username, password;

    public MyAuthenticator(String user, String pass) {
      username = user;
      password = pass;
    }

    protected PasswordAuthentication getPasswordAuthentication() {
      System.out.println("Requesting Host  : " + getRequestingHost());
      System.out.println("Requesting Port  : " + getRequestingPort());
      System.out.println("Requesting Prompt : " + getRequestingPrompt());
      System.out.println("Requesting Protocol: "
          + getRequestingProtocol());
      System.out.println("Requesting Scheme : " + getRequestingScheme());
      System.out.println("Requesting Site  : " + getRequestingSite());
      return new PasswordAuthentication(username, password.toCharArray());
    }
  }
}

- 我现在检查什么,getPasswordAuthentication根本没有被调用？我确定我的IE启用了身份验证,但不确定它是什么类型的身份验证.

Answer 1

将Authenticator仅用于使用网站的基本的HTTP认证(网站,其中你看到著名的Javascript的风格的登录名/密码,弹出式),使用不受网站基于表单的认证(基于HTML <form>与登录名和密码字段通常是养眼标记/风格)并且不像ISP那样像拨号一样登录.对于前者,您实际上需要将登录作为查询字符串传递,对于后者,您实际上需要事先手动连接ISP或创建/使用代理.