建立HttpsConnection

1建立HttpConnection，这种连接比较简单，但是是不安全的，网上例子比较多，现在主要说说如果建立HttpsConnection，这种连接时通过SSL协议加密，相对更安全，一般使用这种连接传输用户名密码，等重要信息的，下面看代码：

public HttpsURLConnection getHttpsConnection(){

        try{

            TrustManager[] tm = { new MyX509TrustManager() };

            SSLContext sslContext = SSLContext.getInstance("SSL");

            sslContext.init(null, tm, new java.security.SecureRandom());

            SSLSocketFactory ssf = sslContext.getSocketFactory();

            System.out.println(TAG+" getHttpsConnection serverUrl="+serverUrl);

            URL myURL = new URL(serverUrl);

            HttpsURLConnection httpsConn = (HttpsURLConnection) myURL.openConnection();

            httpsConn.setSSLSocketFactory(ssf);

            httpsConn.setRequestProperty("accept", "*/*");

            httpsConn.setRequestProperty("connection", "Keep-Alive");

            httpsConn.setRequestMethod("POST");

            httpsConn.setDoOutput(true);

            httpsConn.setDoInput(true);

            httpsConn.connect();

            return httpsConn;

        }catch(Exception e){

            e.printStackTrace();

            return null;

        }

    }

在上面的代码中比较重要的是MyX509TrustManager这个类，这个类是安全的保障，可以是用默认的，但是一般我们都需要对证书进行自定义，因此需要继承下，下面看代码：

package login;

import java.io.FileInputStream;

import java.security.KeyStore;

import java.security.cert.CertificateException;

import java.security.cert.X509Certificate;

import javax.net.ssl.TrustManager;

import javax.net.ssl.TrustManagerFactory;

import javax.net.ssl.X509TrustManager;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

public class MyX509TrustManager implements X509TrustManager {

    //private final String CER_NAME = "D:\\Apache_Software_Foundation\\Tomcat_6.0\\cas.keystore";

    private final String CER_NAME ="D:\\apache-tomcat-7.0.42\\cas.keystore";

    private final String CER_PASSWORD = "changeit";

    private final Log logger = LogFactory.getLog(getClass());

    /*

     * The default X509TrustManager returned by SunX509.  We'll delegate

     * decisions to it, and fall back to the logic in this class if the

     * default X509TrustManager doesn't trust it.

     */

    X509TrustManager sunJSSEX509TrustManager;

    MyX509TrustManager() throws Exception {

        // create a "default" JSSE X509TrustManager.

       KeyStore ks = KeyStore.getInstance("JKS");

       FileInputStream fis = new FileInputStream(CER_NAME);

       ks.load(fis,CER_PASSWORD.toCharArray());

       TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509", "SunJSSE");

       tmf.init(ks);

       TrustManager tms [] = tmf.getTrustManagers();

        for (int i = 0; i < tms.length; i++) {

            if (tms[i] instanceof X509TrustManager) {

                sunJSSEX509TrustManager = (X509TrustManager) tms[i];

                return;

            }

        }

        throw new Exception("liqingguo Couldn't initialize");

    }

    /*

     * Delegate to the default trust manager.

     */

    public void checkClientTrusted(X509Certificate[] chain, String authType)

                throws CertificateException {

        try {

            sunJSSEX509TrustManager.checkClientTrusted(chain, authType);

        } catch (CertificateException excep) {

            // do any special handling here, or rethrow exception.

        }

    }

    /*

     * Delegate to the default trust manager.

     */

    public void checkServerTrusted(X509Certificate[] chain, String authType)

                throws CertificateException {

        try {

            sunJSSEX509TrustManager.checkServerTrusted(chain, authType);

        } catch (CertificateException excep) {

            /*

             * Possibly pop up a dialog box asking whether to trust the

             * cert chain.

             */

        }

    }

    /*

     * Merely pass this through.

     */

    public X509Certificate[] getAcceptedIssuers() {

        return sunJSSEX509TrustManager.getAcceptedIssuers();

    }

}