获取错误java.io.IOException：服务器返回HTTP响应代码：401 for

我试图validationhttpsurl，但我得到了例外。 下面是代码。

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.PrintWriter; import java.io.StringWriter; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import java.net.URLEncoder; import javax.net.ssl.HostnameVerifier; import javax.net.ssl.HttpsURLConnection; import javax.net.ssl.SSLSession; public class Authenticate { /** * @param args */ public void authenticateUrl() { HostnameVerifier hv = new HostnameVerifier() { @Override public boolean verify(String urlHostName, SSLSession session) { System.out.println("Warning: URL Host: " + urlHostName + " vs. " + session.getPeerHost()); return true; } }; // Now you are telling the JRE to trust any https server. // If you know the URL that you are connecting to then this should // not be a problem try { trustAllHttpsCertificates(); } catch (Exception e) { System.out.println("Trustall" + e.getStackTrace()); } HttpsURLConnection.setDefaultHostnameVerifier(hv); StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw); try { URL url = new URL( "www.stackoverflow.com"); // Popup Window to request username/password password // MyAuthenticator ma = new MyAuthenticator(); String userPassword = "user" + ":" + "pass"; // Encode String String encoding = URLEncoder.encode(userPassword, "UTF-8"); // or // String encoding = Base64Converter.encode // (userPassword.getBytes()); // Need to work with URLConnection to set request property URLConnection uc = url.openConnection(); uc.setRequestProperty("Authorization", "UTF-8" + encoding); InputStream content = (InputStream) uc.getInputStream(); BufferedReader in = new BufferedReader(new InputStreamReader( content)); String line; while ((line = in.readLine()) != null) { pw.println(line); } } catch (MalformedURLException e) { e.printStackTrace(); pw.println("Invalid URL"); } catch (IOException e) { e.printStackTrace(); pw.println("Error reading URL"); } catch (Exception e) { e.printStackTrace(); } sw.toString(); } public static void main(String[] args) { // TODO Auto-generated method stub Authenticate au = new Authenticate(); au.authenticateUrl(); } // Just add these two functions in your program public static class TempTrustedManager implements javax.net.ssl.TrustManager, javax.net.ssl.X509TrustManager { public java.security.cert.X509Certificate[] getAcceptedIssuers() { return null; } public boolean isServerTrusted( java.security.cert.X509Certificate[] certs) { return true; } public boolean isClientTrusted( java.security.cert.X509Certificate[] certs) { return true; } public void checkServerTrusted( java.security.cert.X509Certificate[] certs, String authType) throws java.security.cert.CertificateException { return; } public void checkClientTrusted( java.security.cert.X509Certificate[] certs, String authType) throws java.security.cert.CertificateException { return; } } private static void trustAllHttpsCertificates() throws Exception { // Create a trust manager that does not validate certificate chains: javax.net.ssl.TrustManager[] trustAllCerts = new javax.net.ssl.TrustManager[1]; javax.net.ssl.TrustManager tm = new TempTrustedManager(); trustAllCerts[0] = tm; javax.net.ssl.SSLContext sc = javax.net.ssl.SSLContext.getInstance("SSL"); sc.init(null, trustAllCerts, null); javax.net.ssl.HttpsURLConnection.setDefaultSSLSocketFactory( sc.getSocketFactory()); } } 

例外：

 java.io.IOException: Server returned HTTP response code: 401 for URL: at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source) at Authenticate.authenticateUrl(Authenticate.java:62) at Authenticate.main(Authenticate.java:84) 

请任何人都可以建议如何解决此问题。

Answer 1

401错误代码表示“未授权”。 我相信您的代码无法正确编码身份validation标头。 假设服务器需要基本访问身份validation ，代码应如下所示：

 String credentials = "ptt" + ":" + "ptt123"; String encoding = Base64Converter.encode(credentials.getBytes("UTF-8")); URLConnection uc = url.openConnection(); uc.setRequestProperty("Authorization", String.format("Basic %s", encoding)); 

RFC 2617中提供了HTTP基本和摘要式身份validation方案的全面描述

Answer 2

另一种简单的方法是使用Authenticator 。

来自文档

Authenticator类表示一个知道如何获取网络连接身份validation的对象。 通常，它会通过提示用户提供信息来完成此操作。

 URL url = null; try { url = new URL("YOUR_URL"); Authenticator.setDefault(new Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication("YOUR_USERNAME","YOUR_PASSWORD".toCharArray()); } }); }catch (MalformedURLException ex) { e = new WebServiceException(ex); } 

Answer 3

在这里你可以处理错误代码401.在这里使用HTTPURLCONNECTION是我的代码请检查你可以帮助这个

 URL Url = new URL(); HttpURLConnection connection = (HttpURLConnection) Url.openConnection(); connection.setRequestProperty(", response);