java 如何在java中访问https站点

how to access https sites in java

提问by Sarika.S

I have to access an https site through my java code. But it returns 401 response. I included my code below.

我必须通过我的 java 代码访问 https 站点。但它返回 401 响应。我在下面包含了我的代码。

try {        
 URL u = new URL(url);
 HttpURLConnection http = (HttpURLConnection)u.openConnection();
 http.setAllowUserInteraction(true);
 http.connect();

 String userpassword = "HP:M0lveau";
 byte[] encoded = Base64.encodeBase64(userpassword.getBytes());
 String encodedAuthorization = new String(encoded);

 http.setRequestProperty("Authorization", "Basic " + encodedAuthorization);
 InputStream is = http.getInputStream();

 BufferedReader reader = new BufferedReader(new InputStreamReader(is));
 StringBuilder stringBuilder = new StringBuilder();
 String line = null;
 while ((line = reader.readLine()) != null) {
   stringBuilder.append(line + "\n");
 }
 return stringBuilder.toString();

} catch (IOException ioe) {
 logger.debug("fetchDataFromServer:IOException");
 return null;
}

Please help as early as possible.. Thanks in advance....

请尽早帮助.. 提前致谢....

采纳答案by Sarika.S

I got it.. This is my code.

我明白了。这是我的代码。

private static String fetchDataFromServer() throws HttpException, IOException, NoSuchAlgorithmException, KeyManagementException {

        logger.trace("__ENTERING CluemasterData::fetchDataFromServer()");

        try {
            URL u = new URL("https://....");
            HttpsURLConnection http = (HttpsURLConnection)u.openConnection();
            Authenticator.setDefault( new MyAuthenticator() );
            http.setAllowUserInteraction(true);
            http.setRequestMethod("GET");
            http.connect();

            InputStream is = http.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
            StringBuilder stringBuilder = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null)
            {
                stringBuilder.append(line + "\n");
            }
            return stringBuilder.toString();    
        }
        catch (HttpException he) {

            return null;
        } 
        catch (IOException ioe) {

            return null;
        }

    }

The class MyAuthenticator

类 MyAuthenticator

import java.net.Authenticator;
import java.net.PasswordAuthentication;

class MyAuthenticator extends Authenticator
   {
   /**
   * Called when password authorization is needed.
   * @return The PasswordAuthentication collected from the
   * user, or null if none is provided.
   */
   protected PasswordAuthentication getPasswordAuthentication()
      {
      return new PasswordAuthentication ( "username", "password".toCharArray() );
      }
   }

回答by ayush

401 response means that the request requires user authentication. LOOK here for help

401 响应意味着该请求需要用户身份验证。LOOK这里寻求帮助

Have something like

有类似的东西

public static String userNamePasswordBase64(String username, String password)
{
    return "Basic " + base64Encode (username + ":" + password);
}

static public String base64Encode(String s)
{
    ByteArrayOutputStream bout = new ByteArrayOutputStream();

    Base64OutputStream out = new Base64OutputStream(bout);
    try
    {
        out.write(s.getBytes());
        out.flush();
    } catch (IOException e)
    {
    }
return bout.toString();
}

and then use

然后使用

http.setRequestProperty ("Authorization",userNamePasswordBase64("HP","M01veau"));
http.connect();

Also check manually that these credentials are working fine on the given url. Also See this great tutorial

还要手动检查这些凭据在给定的 url 上是否正常工作。另请参阅这个很棒的教程

回答by Maurice Perry

Try to set the Authorization header before the call to connect()

尝试在调用 connect() 之前设置 Authorization 标头