(android 互联网开发)2 访问https接口，进行数据交互（已在实际项目中使用）

前言：
      在android开发中，会涉及到安全比较高的业务，比如银行，网上交易等，这就涉及到https协议的交互
    对于https 交互过程分两个阶段
    1. 客户端获取服务器的证书，并验证证书的内容是否可信
     2. 客户端和服务器端进行握手协议，并进行数据传输
  
    对于https 交互过程，第一点，采用了网站可信的方式，如有需要验证域名和证书是否一致的，请自我扩展
   实现的过程：
   1）： 注册scheme of https
    注意：
HostnameVerifier hostnameVerifier = org.apache.http.conn.ssl.SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER;
如果需要验证，则，自己继承HostnameVerifier ，并实现接口。
    2）：获取 httpClient 和 httpPost
    3）：获取数据
下面是实现的源码，参数就是https路径：
1   public String GetData(String URL)
2       {
3           String returns="";
4        
5           //Step One  register scheme of https
6           HostnameVerifier hostnameVerifier = org.apache.http.conn.ssl.SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER;        
7         
8           SchemeRegistry registry = new SchemeRegistry();  
9           SSLSocketFactory socketFactory = SSLSocketFactory.getSocketFactory();  
10           socketFactory.setHostnameVerifier((X509HostnameVerifier) hostnameVerifier);  
11           registry.register(new Scheme("https", socketFactory, 443));
12           registry.register(new Scheme("http",PlainSocketFactory.getSocketFactory (), 80));
13          
14           //Step Two  Get httpClient and httpPost
15          
16           DefaultHttpClient client = new DefaultHttpClient(); 
17           SingleClientConnManager mgr = new SingleClientConnManager(client.getParams(), registry);      
18           DefaultHttpClient httpClient = new DefaultHttpClient(mgr, client.getParams());     
19           //------- Set verifier   
20           HttpsURLConnection.setDefaultHostnameVerifier(hostnameVerifier);    
21           // -------Example send http request     
22          // final String url = "https://martinreichart.com/_tmpdata/login_valid.json";     
23           HttpPost httpPost = new HttpPost(URL);    
24        
25           //Step Three Get Data
26           try {
27               HttpResponse response = httpClient.execute(httpPost);
28               if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { 
29                // 解析返回的内容  
30                 returns = EntityUtils.toString(response.getEntity());        
31              }
32           }
33           catch(Exception ex)
34           {
35              
36               String aa =ex.toString();
37           }
38          
39           return returns;
40       }