public static void main(String[] args) throws UnrecoverableKeyException, KeyManagementException, NoSuchAlgorithmException, KeyStoreException, CertificateException, FileNotFoundException, IOException {        ResourceLoader resourceLoader = new DefaultResourceLoader();InputStream keyStore = resourceLoader.getResource("test.p12").getInputStream();String   keyStorePassword = "111111";    String  keyPassword = "111111";    String   KeyStoreType= "PKCS12";    String   KeyManagerAlgorithm = "SunX509";    String   SSLVersion = "SSLv3";new Test01().getHttpsURLConnection(null, keyStore, keyStorePassword, keyPassword, KeyStoreType, KeyManagerAlgorithm, SSLVersion);
}

public HttpURLConnection getHttpsURLConnection(URL url, InputStream  keystore,String   keyStorePass,String  keyPassword, String  KeyStoreType,String KeyManagerAlgorithm, String  SSLVersion)throws NoSuchAlgorithmException, KeyStoreException,CertificateException, FileNotFoundException, IOException,UnrecoverableKeyException, KeyManagementException {System.setProperty("javax.net.debug","ssl,handshake,record");SSLContext sslcontext = SSLContext.getInstance(SSLVersion);KeyManagerFactory kmf =  KeyManagerFactory.getInstance(KeyManagerAlgorithm);KeyStore ks = KeyStore.getInstance(KeyStoreType);ks.load(keystore, keyStorePass.toCharArray());kmf.init(ks, keyPassword.toCharArray());TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());tmf.init(ks);TrustManager[] tm = tmf.getTrustManagers();sslcontext.init(kmf.getKeyManagers(), tm, null);SSLSocketFactory sslSocketFactory = sslcontext.getSocketFactory();HttpsURLConnection.setDefaultSSLSocketFactory(sslSocketFactory);//HttpsURLConnection httpsURLConnection = ( HttpsURLConnection)url.openConnection();return null;}

最开始拿到p12的时候，给的密码是错的，试了好久，最后断定是p12文件的密码不正确，

于是通过pem和key重新生成了一个p12文件，密码自己设置后，就成功了。

第二种实现方式：

KeyStore ks = KeyStore.getInstance("PKCS12");
char[] password = "p12pwd".toCharArray();
Resource resource = resourceLoader.getResource("test.p12");
ks.load(resource.getInputStream(), password);
KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
kmf.init(ks, password);
SSLContext ssl = SSLContext.getInstance("TLS");
ssl.init(kmf.getKeyManagers(), null, null);
HttpsURLConnection httpsURLConnection = ( HttpsURLConnection)new URL("").openConnection();
httpsURLConnection.setSSLSocketFactory(ssl.getSocketFactory());