android https 连接建立

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http://www.cnblogs.com/stoic/archive/2012/07/16/2593862.html

Https与Http类似，只不过Https一般是通过post请求服务器，但是Https与http不同的是Https与服务器会话是处于连接状态。http则发送请求后连接就会断开。
发送post请求代码：
String query = r4 + "&pass=" + r3; //请求参数
                     byte[] entitydata = query.getBytes();//得到实体数据
                     HttpsURLConnection urlCon = (new URL(ticketurl)).openConnection();
                     urlCon.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
                     urlCon.setRequestProperty("Content-Length", String.valueOf(entitydata.length));
                     ((HttpsURLConnection) urlCon).setRequestMethod("POST");
                     urlCon.setDoOutput(true);
                     urlCon.setDoInput(true);
                     urlCon.connect();

                     //把封装好的实体数据发送到输出流
                     OutputStream outStream = urlCon.getOutputStream();
                     outStream.write(entitydata);
                     outStream.flush();
                     outStream.close();

                     //服务器返回输入流并读写
                     BufferedReader in = new BufferedReader(new InputStreamReader(urlCon.getInputStream()));
                     String line;

                     while ((line = in.readLine()) != null) {
                              return line;
                     }
                     in.close();
另外使用HttpsURLConnection时需要实现HostnameVerifier 和 X509TrustManager，这两个实现是必须的，要不会报安全验证异常。然后初始化X509TrustManager中的SSLContext，为javax.net.ssl.HttpsURLConnection设置默认的SocketFactory和HostnameVerifier。代码如下：
      private myX509TrustManager xtm = new myX509TrustManager();
      private myHostnameVerifier hnv = new myHostnameVerifier();

      public HttpsURLConnectionTest() {

            //初始化X509TrustManager中的SSLContext
            SSLContext sslContext = null;

            try {
                     sslContext = SSLContext.getInstance("TLS");
                     X509TrustManager[] xtmArray = new X509TrustManager[] { xtm };
                     sslContext.init(null, xtmArray, new java.security.SecureRandom());
            } catch (GeneralSecurityException gse) {

            }

            //为javax.net.ssl.HttpsURLConnection设置默认的SocketFactory和HostnameVerifier
            if (sslContext != null) {
                     HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());
            }

            HttpsURLConnection.setDefaultHostnameVerifier(hnv);
这样就不会报错了。