Java代码访问基于https安全协议的网站或服务器， 一般分为有证书和无证书两种，无证书的大部分都很简单，说一下我遇到的有证书的：
证书类型：pfx,（个人证书带密码）
服务器配置：基于SSL加密模式（我这边是基于nginx配置的https安全验证）

1. 首先要有jks格式文件的证书秘钥文件，如果没有可以向提供方索要pfx证书，带密码，然后把pfx证书转换为jks格式的密钥文件，因为用程序访问的话必须要密钥类型的文件才行，首先进入你的jdk,进入:
   %JAVA_HOME%/jre/bin目录下，执行如下命令：
   keytool -importkeystore -v -srckeystore client.pfx -srcstoretype pkcs12 -srcstorepass 111111 -destkeystore client.jks -deststoretype jks
   命令说明：一般命令从字面意思都能看懂，就不在说明
   kytool是jdk自带的一个密钥工具，源文件时客户端证书client.pfx,类型未pkcs12,密码是111111，目标密钥文件是client.jks,目标类型是jks

1. 现在有了密钥文件和密码，就可以用java代码来访问了,把下面这段代码直接拷贝到你的

   package mr;import java.io.BufferedReader;
   import java.io.FileInputStream;
   import java.io.FileNotFoundException;
   import java.io.IOException;
   import java.io.InputStream;
   import java.io.InputStreamReader;
   import java.net.HttpURLConnection;
   import java.net.MalformedURLException;
   import java.net.URL;
   import java.security.KeyManagementException;
   import java.security.KeyStore;
   import java.security.KeyStoreException;
   import java.security.NoSuchAlgorithmException;
   import java.security.UnrecoverableKeyException;
   import java.security.cert.CertificateException;
   import java.security.cert.X509Certificate;import javax.net.ssl.HostnameVerifier;
   import javax.net.ssl.HttpsURLConnection;
   import javax.net.ssl.KeyManager;
   import javax.net.ssl.KeyManagerFactory;
   import javax.net.ssl.SSLContext;
   import javax.net.ssl.SSLSession;
   import javax.net.ssl.SSLSocketFactory;
   import javax.net.ssl.TrustManager;
   import javax.net.ssl.X509TrustManager;public class MarketReplyTest {public static String HTTPSURL = "https://196.123.131.7/DSFA/MarketReply/GetReplayRecords?opType=get3DESStr&str=111111";public static void main(String[] args){testHttpsPost();}public static void testHttpsPost() {String keystorefile = "c:\\\\cafakeystore_client1.jks";// 个人pfx证书转换为jks密钥文件，该密钥文件可以用程序进行访问String keystorepw = "111111";// 证书密码KeyStore keystore = null;try {keystore = KeyStore.getInstance("JKS");//密钥类型为jkskeystore.load(new FileInputStream(keystorefile), keystorepw.toCharArray());// 加载密钥文件KeyManagerFactory keymanagerfactory = KeyManagerFactory.getInstance("SunX509");// 获取密钥管理类的工厂类keymanagerfactory.init(keystore, keystorepw.toCharArray());// 工厂类初始化密钥文件，这里依然需要密码KeyManager[] akeymanager = keymanagerfactory.getKeyManagers();// 获取密钥管理类TrustManager[] atrustmanager = { new TrustAnyTrustManager() };// 获取受信任的证书SSLContext ssl = SSLContext.getInstance("TLS");// 获取安全协议上下文ssl.init(akeymanager, atrustmanager, null);// 初始化安全协议SSLSocketFactory sslsocketfactory = ssl.getSocketFactory();// 获取协议通信URL url = new URL(HTTPSURL);HttpsURLConnection https = (HttpsURLConnection) url.openConnection();https.setSSLSocketFactory(sslsocketfactory);https.setHostnameVerifier(new TrustAnyHostnameVerifier());https.setDoInput(true);https.setDoOutput(true);https.setUseCaches(false);https.setRequestMethod("POST");https.connect();InputStream in = https.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(in));String result = "";String line = "";while ((line = reader.readLine()) != null) {result += line + "\\r";}System.out.println(result);// 输出结果值,reader.close();https.disconnect();} catch (KeyStoreException e) {e.printStackTrace();} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (CertificateException e) {e.printStackTrace();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} catch (KeyManagementException e) {e.printStackTrace();} catch (UnrecoverableKeyException e) {e.printStackTrace();}}/***信任所有证书(个人证书本来就不受信任，所以在此做处理)**/private static class TrustAnyTrustManager implements X509TrustManager {public void checkClientTrusted(X509Certificate[] arg0, String arg1)throws CertificateException {}public void checkServerTrusted(X509Certificate[] arg0, String arg1)throws CertificateException {}public X509Certificate[] getAcceptedIssuers() {return new X509Certificate[] {};}}/*** 验证IP**/private static class TrustAnyHostnameVerifier implements HostnameVerifier {public boolean verify(String hostname, SSLSession session) {return hostname.equals(session.getPeerHost());}}}