产生信任锚错误的原因有很多。对我来说，我只是想访问https://example.com/而不是https://www.example.com/。

因此，在开始构建自己的信任管理器(就像我做的那样)之前，您可能需要仔细检查您的url。

根据最新的Android文档(2017年3月)更新:

当你得到这种类型的错误:

javax.net.ssl.SSLHandshakeException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.
        at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:374)
        at libcore.net.http.HttpConnection.setupSecureSocket(HttpConnection.java:209)
        at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.makeSslConnection(HttpsURLConnectionImpl.java:478)
        at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.connect(HttpsURLConnectionImpl.java:433)
        at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
        at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
        at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:282)
        at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:177)
        at libcore.net.http.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:271)

问题可能是以下情况之一:

颁发服务器证书的CA未知 服务器证书不是由CA签署的，而是自签署的 服务器配置缺少一个中间CA

解决方案是教会HttpsURLConnection信任一组特定的ca。怎么做?请查看https://developer.android.com/training/articles/security-ssl.html#CommonProblems

其他使用com.loopj的AsyncHTTPClient的人。android:android-async-http库，请检查设置AsyncHttpClient使用HTTPS。

我使用这些方法，其中一个是上述解决方案对我有效: 第一:

   public  okhttp3.OkHttpClient getUnsafeOkHttpClient() {
    try {
        // Create a trust manager that does not validate 
   certificate chains
        final TrustManager[] trustAllCerts = new TrustManager[] {
                new X509TrustManager() {
                    @Override
                    public void 
   checkClientTrusted(java.security.cert.X509Certificate[] chain, 
   String authType) throws CertificateException {
                    }

                    @Override
                    public void 
  checkServerTrusted(java.security.cert.X509Certificate[] chain, 
  String authType) throws CertificateException {
                    }

                    @Override
                    public java.security.cert.X509Certificate[] 
   getAcceptedIssuers() {
                        return new 
  java.security.cert.X509Certificate[]{};
                    }
                }
        };

        // Install the all-trusting trust manager
        final SSLContext sslContext = 
  SSLContext.getInstance("SSL");
        sslContext.init(null, trustAllCerts, new 
  java.security.SecureRandom());

        // Create an ssl socket factory with our all-trusting 
       manager
        final SSLSocketFactory sslSocketFactory = 
       sslContext.getSocketFactory();

        okhttp3.OkHttpClient.Builder builder = new 
      okhttp3.OkHttpClient.Builder();
        builder.sslSocketFactory(sslSocketFactory, 
      (X509TrustManager)trustAllCerts[0]);
        builder.hostnameVerifier(new HostnameVerifier() {
            @Override
            public boolean verify(String hostname, SSLSession 
       session) {
                return true;
            }
        });

        okhttp3.OkHttpClient okHttpClient = builder.build();
        return okHttpClient;
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

第二:

    @SuppressLint("TrulyRandom")
    public static void handleSSLHandshake() {
    try {
        TrustManager[] trustAllCerts = new TrustManager[]{new 
       X509TrustManager() {
            public X509Certificate[] getAcceptedIssuers() {
                return new X509Certificate[0];
            }

            @Override
            public void checkClientTrusted(X509Certificate[] 
        certs, String authType) {
            }

            @Override
            public void checkServerTrusted(X509Certificate[] 
       certs, String authType) {
            }
        }};

        SSLContext sc = SSLContext.getInstance("SSL");
        sc.init(null, trustAllCerts, new SecureRandom());
        



  HttpsURLConnection
 .setDefaultSSLSocketFactory(sc.getSocketFactory());
        HttpsURLConnection.setDefaultHostnameVerifier(new 
    HostnameVerifier() {
            @Override
            public boolean verify(String arg0, SSLSession arg1) {
                return true;
            }
        });
    } catch (Exception ignored) {
    }
}

和: 把这些库放到你的类路径中:

 implementation 'com.squareup.okhttp:okhttp:2.3.0'
implementation 'com.squareup.okhttp:okhttp-urlconnection:2.3.0'
    androidTestImplementation 'androidx.test.espresso:espresso- 
    core:3.3.0'

一定要在课堂上给他们打电话

在姜饼手机，我总是得到这个错误:信任锚没有找到Android SSL连接，即使我设置依赖于我的证书。

下面是我使用的代码(在Scala语言中):

object Security {
    private def createCtxSsl(ctx: Context) = {
        val cer = {
            val is = ctx.getAssets.open("mycertificate.crt")
            try
                CertificateFactory.getInstance("X.509").generateCertificate(is)
            finally
                is.close()
        }
        val key = KeyStore.getInstance(KeyStore.getDefaultType)
        key.load(null, null)
        key.setCertificateEntry("ca", cer)

        val tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm)
    tmf.init(key)

        val c = SSLContext.getInstance("TLS")
        c.init(null, tmf.getTrustManagers, null)
        c
    }

    def prepare(url: HttpURLConnection)(implicit ctx: Context) {
        url match {
            case https: HttpsURLConnection ⇒
                val cSsl = ctxSsl match {
                    case None ⇒
                        val res = createCtxSsl(ctx)
                        ctxSsl = Some(res)
                        res
                    case Some(c) ⇒ c
                }
                https.setSSLSocketFactory(cSsl.getSocketFactory)
            case _ ⇒
        }
    }

    def noSecurity(url: HttpURLConnection) {
        url match {
            case https: HttpsURLConnection ⇒
                https.setHostnameVerifier(new HostnameVerifier {
                    override def verify(hostname: String, session: SSLSession) = true
                })
            case _ ⇒
        }
    }
}

下面是连接代码:

def connect(securize: HttpURLConnection ⇒ Unit) {
    val conn = url.openConnection().asInstanceOf[HttpURLConnection]
    securize(conn)
    conn.connect();
    ....
}

try {
    connect(Security.prepare)
} catch {
    case ex: SSLHandshakeException /*if ex.getMessage != null && ex.getMessage.contains("Trust anchor for certification path not found")*/ ⇒
        connect(Security.noSecurity)
}

基本上，我在自定义证书上设置了信任。如果失败，我就禁用安全机制。这不是最好的选择，但这是我所知道的对于老旧和有问题的手机的唯一选择。

这个示例代码，可以很容易地翻译成Java。

In my case, the root & intermediate certificates was successfully installed but I still got "Trust anchor for certification path not found." exception!. After digging the android document, found out that by default, secure connections (using protocols like TLS and HTTPS) from all apps trust the pre-installed system CAs, and apps targeting Android 6.0 (API level 23) and lower also trust the user-added CA store by default. If your app running on a OS with api level higher than 23 you should explicitly allow the app to trust user-added CA by adding its address to network_security_config like bellow:

<domain-config>
        <domain includeSubdomains="true">PUT_YOUR_SERVER_ADDERESS</domain>
        <trust-anchors>
            <certificates src="user" />
        </trust-anchors>
</domain-config>

@Chrispix的解决方案是危险的!相信所有的证书允许任何人做一个人在中间攻击!只要向客户端发送任何证书，它就会接受它!

将您的证书添加到自定义信任管理器，如本文所述:通过HTTPS使用HttpClient信任所有证书

虽然使用自定义证书建立安全连接有点复杂，但它将为您带来所需的ssl加密安全，而没有中间人攻击的危险!