通过java打开需要Authentication的网页答案

【问题标题】：open a web page through java that need Authentication通过java打开需要Authentication的网页
【发布时间】：2014-11-28 15:50:30
【问题描述】：

我正在尝试通过 JAVA 打开一个需要用户名和密码的网页： page I am trying to acces

这是我复制的引用from this site的代码：

    public static void main(String[] args) {

    try {
        String webPage = "https://reports.tradenetworks.com/ReportServer_DISTRIBUTORRS?%2fDealing&rs:Command=ListChildren";
        String name = "Tradenetworks\\USER";
        String password = "PASS";
        String authString = name + ":" + password;
        System.out.println("auth string: " + authString);
        byte[] authEncBytes = Base64.encodeBase64(authString.getBytes());
        String authStringEnc = new String(authEncBytes);
        System.out.println("Base64 encoded auth string:" + authStringEnc);

        URL url = new URL(webPage);
        URLConnection urlConnection = url.openConnection();
        urlConnection.setRequestProperty("Authorization", "Basic " + authStringEnc);
        InputStream is = urlConnection.getInputStream();
        InputStreamReader isr = new InputStreamReader(is);

        int numCharsRead;
        char[] charArray = new char[1024];
        StringBuffer sb = new StringBuffer();
        while ((numCharsRead = isr.read(charArray)) > 0) {
            sb.append(charArray, 0, numCharsRead);
        }
        String result = sb.toString();

        System.out.println("*** BEGIN ***");
        System.out.println(result);
        System.out.println("*** END ***");
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

但是我从 eclipse 中得到这个错误：

java.io.IOException: Authentication failure
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
at ConnectToUrlUsingBasicAuthentication.main(ConnectToUrlUsingBasicAuthentication.java:27)

【问题讨论】：

不，您从站点的网络服务器而不是 Eclipse 收到该错误。停止射击信使。所以现在你必须调试你的问题，我会首先输出那个base64编码字符串来看看里面到底有什么——可能它不正确。当您只是从某个随机站点复制/粘贴代码时，往往会发生这种情况。您确实尝试在浏览器中打开网址，对吗？如果用户名/密码实际上是错误的，那就太可惜了。
嘿用户名和密码正确我重新检查了如果base64正确我现在怎么办？

标签： java html authentication web

【解决方案1】：

我认为问题出在带有斜杠的 username 字符串 (\\) 中。这些字符在 URL 编码时看起来像这样：%5C%5C。所以，你应该试试String name = "Tradenetworks%5C%5CUSER";。

希望有帮助！

【讨论】：

【解决方案2】：

我也遇到了同样的问题！我设法通过使用自定义身份验证器使代码正常工作：

try {
    // Sets the authenticator that will be used by the networking code
    // when a proxy or an HTTP server asks for authentication.
    Authenticator.setDefault(new CustomAuthenticator());

    URL url = new URL(webPage);

    // read text returned by server
    BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));

    String line;
    while ((line = in.readLine()) != null) {
        System.out.println(line);
    }
    in.close();
} catch (MalformedURLException e) {
    System.out.println("Malformed URL: " + e.getMessage());
} catch (IOException e) {
    System.out.println("I/O Error: " + e.getMessage());
}

这里是customAuthendicator的实现。

public static class CustomAuthenticator extends Authenticator {

    // Called when password authorization is needed
    protected PasswordAuthentication getPasswordAuthentication() {
        String username = "ImtLis";
        String password = "ImtLis2017";
        // Return the information (a data holder that is used by
        // Authenticator)
        return new PasswordAuthentication(username, password.toCharArray());
    }

}

希望这会有所帮助。信息来源：here。

【讨论】：