CertPathValidatorException: Trust anchor for certification path not found解決方法

1. 概述

如果我們的專案新增了 OkHttpUtils 的證照，如果報這個錯，解決方案如下，直接 複製 trustAllHosts() 方法到自己專案中即可，或者根據 這個方法修改自己對應程式碼即可；

錯誤log:

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:413)
    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:257)
    at libcore.net.http.HttpConnection.setupSecureSocket(HttpConnection.java:210)
    at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.makeSslConnection(HttpsURLConnectionImpl.java:477)
    at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.connect(HttpsURLConnectionImpl.java:432)
    at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282)
    at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232)
    at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
    at libcore.net.http.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:164)
    at com.etnet.global.ConnectionTool.post(ConnectionTool.java:462)
    at com.etnet.android.Welcome$3.run(Welcome.java:177)
 Caused by: java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: Trust anchor for   
 
certification path not found.
    at org.apache.harmony.xnet.provider.jsse.TrustManagerImpl.checkTrusted(TrustManagerImpl.java:184)
    at org.apache.harmony.xnet.provider.jsse.TrustManagerImpl.checkServerTrusted(TrustManagerImpl.java:163)
    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.verifyCertificateChain(OpenSSLSocketImpl.java:593)
    at org.apache.harmony.xnet.provider.jsse.NativeCrypto.SSL_do_handshake(Native Method)
    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:410)
    ... 10 more

解決方法：忽略證照驗證：

public static StringBuffer post(String urlString, String param) {
        StringBuffer sb = new StringBuffer();
        URL url = null;
        HttpURLConnection connection = null;
        DataOutputStream out = null;
        BufferedReader in = null;
        try {
            url = new URL(urlString);
            
            //關鍵程式碼
            //ignore https certificate validation |忽略 https 證照驗證
            if (url.getProtocol().toUpperCase().equals("HTTPS")) {
                trustAllHosts();
                HttpsURLConnection https = (HttpsURLConnection) url
                        .openConnection();
                https.setHostnameVerifier(HttpIgnoreSSL.DO_NOT_VERIFY);
                connection = https;
            } else {
                connection = (HttpURLConnection) url.openConnection();
            }
            
            connection.setReadTimeout(10000);
            connection.setDoInput(true);
            connection.setDoOutput(true);
            connection.setRequestMethod("POST");
            connection.setUseCaches(false);
            connection.setInstanceFollowRedirects(true);
            connection.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded");
            connection.connect();
            out = new DataOutputStream(
                    connection.getOutputStream());
            out.writeBytes(param);
            out.flush();
 
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()), 512);
            String line;
            while ((line = in.readLine()) != null) {
                sb.append(line.trim());
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                }
            }
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                }
            }
            if (connection != null) {
                connection.disconnect();
            }
        }
        return sb;
    }


public static void trustAllHosts() {
        // Create a trust manager that does not validate certificate chains
        // Android use X509 cert
        TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
            public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                return new java.security.cert.X509Certificate[] {};
            }
 
            public void checkClientTrusted(X509Certificate[] chain,
                    String authType) throws CertificateException {
            }
 
            public void checkServerTrusted(X509Certificate[] chain,
                    String authType) throws CertificateException {
            }
        } };
 
        // Install the all-trusting trust manager
        try {
            SSLContext sc = SSLContext.getInstance("TLS");
            sc.init(null, trustAllCerts, new java.security.SecureRandom());
            HttpsURLConnection
                    .setDefaultSSLSocketFactory(sc.getSocketFactory());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


public final static HostnameVerifier DO_NOT_VERIFY = new HostnameVerifier() {
        public boolean verify(String hostname, SSLSession session) {
            return true;
        }
    };