前面写了http的联网方式,Android平台上经常有使用https的需求,对于https服务器使用的根证书是受信任的证书的话,实现https是非常简单的,直接用httpclient库就行了,与使用http几乎没有区别。但是在大多数情况下,服务器所使用的根证书是自签名的,或者签名机构不在设备的信任证书列表中,这样使用httpclient进行https连接就会失败。解决这个问题的办法有两种,一是在发起https连接之前将服务器证书加到httpclient的信任证书列表中,这个相对来说比较复杂一些,很容易出错;另一种办法是让httpclient信任所有的服务器证书,这种办法相对来说简单很多,但安全性则差一些,但在某些场合下有一定的应用场景。这一篇主要实现httpclient信任所有的服务器证书。
直接给出代码:
public class HttpsTestActivity extends Activity { /** Called when the activity is first created. */ private TextView text; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); text=(TextView)findViewById(R.id.textView1); GetHttps(); } private void GetHttps(){ String https = "https://www.google.com.hk"; try{ SSLContext sc = SSLContext.getInstance("TLS"); sc.init(null, new TrustManager[]{new MyTrustManager()}, new SecureRandom()); HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory()); HttpsURLConnection.setDefaultHostnameVerifier(new MyHostnameVerifier()); HttpsURLConnection conn = (HttpsURLConnection)new URL(https).openConnection(); conn.setDoOutput(true); conn.setDoInput(true); conn.connect(); BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream())); StringBuffer sb = new StringBuffer(); String line; while ((line = br.readLine()) != null) sb.append(line); text.setText(sb.toString()); }catch(Exception e){ Log.e(this.getClass().getName(), e.getMessage()); } } private class MyHostnameVerifier implements HostnameVerifier{ @Override public boolean verify(String hostname, SSLSession session) { // TODO Auto-generated method stub return true; } } private class MyTrustManager implements X509TrustManager{ @Override public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException { // TODO Auto-generated method stub } @Override public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException { // TODO Auto-generated method stub } @Override public X509Certificate[] getAcceptedIssuers() { // TODO Auto-generated method stub return null; } } }
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。
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本文转自xyz_lmn51CTO博客,原文链接:http://blog.51cto.com/xyzlmn/1230782,如需转载请自行联系原作者