证书获取

1. 从网页获取

在chrome浏览器打开服务地址，Ctrl+Shift+I打开开发者工具，选择Security->View certificate下载证书；

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2. 找网站开发者（后台）要☺

保存证书文件到assets目录下

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设置证书，并信任所有证书

        OkHttpClient.Builder builder = new OkHttpClient.Builder();
        try {
            //设置证书
            setCertificates(builder, Utils.getApp().getAssets().open(BuildConfig.HTTPS_FILENAME));
            //信任所有证书
            builder.hostnameVerifier((hostname, session) -> true);
        } catch (Exception e) {
            e.printStackTrace();
        }

获取证书代码

    * 通过okhttpClient来设置证书
     *
     * @param clientBuilder OKhttpClient.builder
     * @param certificates  读取证书的InputStream
     */
    private static void setCertificates(OkHttpClient.Builder clientBuilder, InputStream... certificates) {
        try {
            CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
            KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
            keyStore.load(null);
            int index = 0;
            for (InputStream certificate : certificates) {
                String certificateAlias = Integer.toString(index++);
                keyStore.setCertificateEntry(certificateAlias, certificateFactory
                        .generateCertificate(certificate));
                try {
                    if (certificate != null)
                        certificate.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(
                    TrustManagerFactory.getDefaultAlgorithm());
            trustManagerFactory.init(keyStore);
            TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();
            if (trustManagers.length != 1 || !(trustManagers[0] instanceof X509TrustManager)) {
                throw new IllegalStateException("Unexpected default trust managers:"
                        + Arrays.toString(trustManagers));
            }
            X509TrustManager trustManager = (X509TrustManager) trustManagers[0];
            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, trustManagerFactory.getTrustManagers(), new SecureRandom());
            SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
            clientBuilder.sslSocketFactory(sslSocketFactory, trustManager);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

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