Java 异常…http异常403

有人能帮我吗？我正在使用下面的代码访问一个网页，我已经通过浏览器通过一些用户密码认证访问了该网页。 但当我尝试同样的方法时，我得到了403异常，我做错了吗

import java.io.BufferedReader; 
import java.io.InputStreamReader; 
import java.net.URL; 
import java.net.URLConnection; 
import java.net.PasswordAuthentication;
import java.net.Authenticator;
import java.net.InetAddress;
import java.lang.reflect.Proxy;
import java.lang.System;
import sun.misc.*;
import java.net.HttpURLConnection;

public class summa { 

    //static final String kuser = " "; // your account name
    static final String kpass = " "; // your password for the account

    //static class MyAuthenticator extends Authenticator {
        //public PasswordAuthentication getPasswordAuthentication() {
            // I haven't checked getRequestingScheme() here, since for NTLM
            // and Negotiate, the usrname and password are all the same.
            //System.err.println("Feeding username and password for " + //getRequestingScheme());
            //return (new PasswordAuthentication(kuser, kpass.toCharArray()));
        //}
    //}

    public static void main(String[] args) { 

        try { 
                URL google = new URL("http://www.google.com/"); 
                HttpURLConnection yc =(HttpURLConnection)google.openConnection(); 
                System.setProperty("http.proxyHost","171.160.82.70") ;   
                System.setProperty("http.proxyPort", "80") ;   
                String userPassword = " ";   
                String encoding = new sun.misc.BASE64Encoder().encode (userPassword.getBytes());   
                //Authenticator.setDefault(new MyAuthenticator());
                yc.setRequestProperty ("Authorization", "Basic " + encoding);   
                yc.setRequestProperty(userPassword, encoding);   
                yc.addRequestProperty("User-Agent","ie-7 (compatible; MSIE 6.0; Windows NT 5.0)"); 

                BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream())); 
                String inputLine="s"; 

                inputLine=in.readLine();
                System.out.println(inputLine); 


                in.close(); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
    } 
}

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参阅.< /P>请格式化代码，是否考虑使用一个已验证的HTTP客户端库？如果您试图用上面的代码访问谷歌，则需要附加一个注释：谷歌允许访问某些用户代理，java可能是其中之一。No.i为实例添加了谷歌。它真的随我们使用的url而变化吗？如果是的话，有没有办法检查它？如果你想确保你没有因此而被拒绝，请将你的用户代理更改为类似Firefox字符串的内容。是的，谷歌是一个很坏的例子，因为如果你不使用他们的API，他们对UA很挑剔。@jCoder:你不是说禁止吗？