应该有很多小伙伴遇到这样一个问题，在线上已发布的app里，关于https的cer证书过期，从而导致app所有网络请求失效无法使用。
这个时候有人就要说了，应急发布一个已更新最新cer证书的apk不就完事了么，其实没那么简单，iOS还好可以通过appstore提供的api查询到新版本，但android就不一样了，需要调用自己Server端提供的api接口查询到新版本，并获取apk下载路径，问题是https都不能访问了，如何请求到版本信息呢？
博主在这里提供2种解决方案
方案一：将版本信息接口让后台改成http（不推荐，后台因素不可控），或者将本地https的设置一个不安全校验（推荐），代码如下:
private static OkHttpClient newOkHttpClient(int timeout){ HttpLoggingInterceptor logging = new HttpLoggingInterceptor(); logging.setLevel(HttpLoggingInterceptor.Level.BODY); return new OkHttpClient.Builder() .addInterceptor(new RequestInfoInterceptor()) //.addInterceptor(logging) .addNetworkInterceptor(new TokenHeaderInterceptor()) .sslSocketFactory(Certificate.getSSLSocketFactory()) //设置不安全校验 .hostnameVerifier(Certificate.getUnSafeHostnameVerifier()) .readTimeout(timeout, TimeUnit.SECONDS) .writeTimeout(timeout, TimeUnit.SECONDS) .build(); } /** *获取HostnameVerifier */ public static HostnameVerifier getUnSafeHostnameVerifier() { HostnameVerifier hostnameVerifier = new HostnameVerifier() { @Override public boolean verify(String s, SSLSession sslSession) { return true; } }; return hostnameVerifier; }
方案二：将xxx.cer证书改成动态读取（以文件的方式从app沙盒里面读取即可），在https证书即将过期时，从服务器下载最新的cer证书更新到沙盒里面，App每次初始化网络请求时读取sdcard最新的证书文件，这样App就永远不会出现https证书过期导致无法使用的问题，流程图如下：
image.png
这里粘贴关键设置cer证书的代码
private static OkHttpClient newOkHttpClient(int timeout){ HttpLoggingInterceptor logging = new HttpLoggingInterceptor(); logging.setLevel(HttpLoggingInterceptor.Level.BODY); return new OkHttpClient.Builder() .addInterceptor(new RequestInfoInterceptor()) //.addInterceptor(logging) .addNetworkInterceptor(new TokenHeaderInterceptor()) .sslSocketFactory(Certificate.getSSLSocketFactory(BaseApplcation.myApp, new String[]{"/sdcard/xxx.cer"})) .hostnameVerifier(Certificate.getUnSafeHostnameVerifier()) .readTimeout(timeout, TimeUnit.SECONDS) .writeTimeout(timeout, TimeUnit.SECONDS) .build(); } /** * 带证书的，从本地文件读取 * @param context * @param certificatesFiles 本地文件（通过下载到本地） * @return */ public static SSLSocketFactory getSSLSocketFactory(Context context, String[] certificatesFiles) { if (context == null) { throw new NullPointerException("context == null"); } CertificateFactory certificateFactory; try { certificateFactory = CertificateFactory.getInstance("X.509"); KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType()); keyStore.load(null, null); for (int i = 0; i < certificatesFiles.length; i++) { InputStream certificate = new FileInputStream(certificatesFiles[i]); keyStore.setCertificateEntry(String.valueOf(i), certificateFactory.generateCertificate(certificate)); if (certificate != null) { certificate.close(); } } SSLContext sslContext = SSLContext.getInstance("TLS"); TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm()); trustManagerFactory.init(keyStore); sslContext.init(null, trustManagerFactory.getTrustManagers(), new SecureRandom()); return sslContext.getSocketFactory(); } catch (Exception e) { } return null; } /** * 带证书的，从raw资源中读取 * @param context * @param certificates rawIds * @return */ public static SSLSocketFactory getSSLSocketFactory(Context context, int[] certificates) { if (context == null) { throw new NullPointerException("context == null"); } CertificateFactory certificateFactory; try { certificateFactory = CertificateFactory.getInstance("X.509"); KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType()); keyStore.load(null, null); for (int i = 0; i < certificates.length; i++) { InputStream certificate = context.getResources().openRawResource(certificates[i]); keyStore.setCertificateEntry(String.valueOf(i), certificateFactory.generateCertificate(certificate)); if (certificate != null) { certificate.close(); } } SSLContext sslContext = SSLContext.getInstance("TLS"); TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm()); trustManagerFactory.init(keyStore); sslContext.init(null, trustManagerFactory.getTrustManagers(), new SecureRandom()); return sslContext.getSocketFactory(); } catch (Exception e) { } return null; }
总结一下，方案一需要App升级解决证书过期问题，方案二无需升级即可解决升级问题，小伙伴们，设置证书用哪种方式，心里有答案了吧。
代码虽简单，就当做个笔记。
