Android实现https网络通信之添加指定信任证书/信任所有证书

当Android客户端访问https网站，默认情况下，受证书信任限制，无法访问，可以有两种解决方法来实现：

1、将要访问的https网站的ca证书添加到客户端信任证书列表中，此种方式为谷歌推荐，安全性高。

2、将客户端设置为信任所有证书，也就是说不验证服务器证书，此种方式实现简单，但是安全性低，不推荐使用。

直接上代码，分别实现两种方式的访问。

1、客户端添加指定信任证书

assets目录中放置ca.crt证书，此证书为https://certs.cac.washington.edu/CAtest/网站的信任证书。

public void initSSL() throws CertificateException, IOException, KeyStoreException,            NoSuchAlgorithmException, KeyManagementException {        CertificateFactory cf = CertificateFactory.getInstance("X.509");        InputStream in = getAssets().open("ca.crt");        Certificate ca = cf.generateCertificate(in);        KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());        keystore.load(null, null);        keystore.setCertificateEntry("ca", ca);        String tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm();        TrustManagerFactory tmf = TrustManagerFactory.getInstance(tmfAlgorithm);        tmf.init(keystore);        // Create an SSLContext that uses our TrustManager        SSLContext context = SSLContext.getInstance("TLS");        context.init(null, tmf.getTrustManagers(), null);        URL url = new URL("https://certs.cac.washington.edu/CAtest/");//        URL url = new URL("https://github.com");        HttpsURLConnection urlConnection = (HttpsURLConnection) url.openConnection();        urlConnection.setSSLSocketFactory(context.getSocketFactory());        InputStream input = urlConnection.getInputStream();        BufferedReader reader = new BufferedReader(new InputStreamReader(input, "UTF-8"));        StringBuffer result = new StringBuffer();        String line = "";        while ((line = reader.readLine()) != null) {            result.append(line);        }        Log.e("TTTT", result.toString());    }

2、客户端信任所有https，免证书验证

public void initSSLALL() throws KeyManagementException, NoSuchAlgorithmException, IOException {//        URL url = new URL("https://certs.cac.washington.edu/CAtest/");        URL url = new URL("https://github.com");        SSLContext context = SSLContext.getInstance("TLS");        context.init(null, new TrustManager[]{new TrustAllManager()}, null);        HttpsURLConnection.setDefaultSSLSocketFactory(context.getSocketFactory());        HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {            @Override            public boolean verify(String arg0, SSLSession arg1) {                return true;            }        });        HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();        connection.setDoInput(true);        connection.setDoOutput(false);        connection.setRequestMethod("GET");        connection.connect();        InputStream in = connection.getInputStream();        BufferedReader reader = new BufferedReader(new InputStreamReader(in));        String line = "";        StringBuffer result = new StringBuffer();        while ((line = reader.readLine()) != null) {            result.append(line);        }        Log.e("TTTT", result.toString());    }

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