Android--https

public static SSLContext getSSLContext() {
    // 从assets中加载证书，取到证书的输入流
    InputStream is = getApplicationContext().getAssets().open("srca.cer");
    // 证书工厂
    CertificateFactory cf = CertificateFactory.getInstance("X.509");
    Certificate ca = cf.generateCertificate(is);

    // 加载证书到密钥库中
    String keyStoreType = KeyStore.getDefaultType();
    KeyStore keyStore = KeyStore.getInstance(keyStoreType);
    keyStore.load(null);
    keyStore.setCertificateEntry("cert", ca);

    // 加载密钥库到信任管理器
    String algorithm = TrustManagerFactory.getDefaultAlgorithm();
    TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(algorithm);
    trustManagerFactory.init(keyStore);
    TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();

    // 用 TrustManager 初始化一个 SSLContext
    SSLContext sslContext = SSLContext.getInstance("TLS");
    sslContext.init(null, trustManagers, null);
    urlCon.setSSLSocketFactory(sslContext.getSocketFactory());
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