public static void main(String[] args) throws IOException, UnrecoverableKeyException, CertificateException, KeyStoreException, KeyManagementException {

        SSLConnectionSocketFactory socketFactory = getSocketFactory();

        // 创建 CloseableHttpClient 对象

        CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(socketFactory).build();

        // 指定请求的 URL 并创建 HttpPost 对象

        HttpPost httppost = new HttpPost("https://xxxx/yyyy");

        // 设置请求通过的代理

        httppost.setConfig(RequestConfig.custom().setProxy(new HttpHost("host", 8080)).build());

        HttpEntity entity;

        // 设置请求的 ContentType 为 application/x-www-form-urlencoded

        httppost.addHeader(HttpHeaders.CONTENT_TYPE, Consts.HTTP_REQUEST_CONTENTTYPE_FORM);

        // 构建 POST 的内容

        List<BasicNameValuePair> nvps = new ArrayList<>();

        nvps.add(new BasicNameValuePair("amount", "1.00"));

        entity = new UrlEncodedFormEntity(nvps, Consts.CHARSET_UTF8);

        httppost.setEntity(entity);

        CloseableHttpResponse response = null;

        try {

            // 发送请求

            response = httpclient.execute(httppost);

            // 获取响应内容

            HttpEntity entity1 = response.getEntity();

            System.out.println(EntityUtils.toString(entity1));

        } finally {

            if (null != response) {

                response.close();

            }

            if (null != httpclient) {

                httpclient.close();

            }

        }

    }

    // 忽略服务器端证书链的认证

    private static TrustManager getTrustManagers() {

        return new X509TrustManager() {

            public X509Certificate[] getAcceptedIssuers() {

                return null;

            }

            public void checkClientTrusted(X509Certificate[] certs, String authType) {

            }

            public void checkServerTrusted(X509Certificate[] certs, String authType) {

            }

        };

    }

    private static SSLConnectionSocketFactory getSocketFactory() throws IOException, KeyStoreException, CertificateException, UnrecoverableKeyException, KeyManagementException {

        SSLContext sslContext;

        try {

            // keyStore 用来存放客户端证书

            KeyStore keyStore = KeyStore.getInstance("PKCS12");

            FileInputStream instream = new FileInputStream(new File("d:\\test.p12"));

            try {

                keyStore.load(instream, "passwd".toCharArray());

            } finally {

                instream.close();

            }

            // 加载客户端证书，并设置HTTPS的安全协议为 TLSv1.2

            sslContext = SSLContexts.custom().loadKeyMaterial(keyStore, "passwd".toCharArray()).useProtocol("TLSv1.2").build();

        } catch (NoSuchAlgorithmException e) {

            return null;

        }

        try {

            sslContext.init(null, new TrustManager[]{getTrustManagers()}, new java.security.SecureRandom());

        } catch (KeyManagementException e) {

            return null;

        }

        return new SSLConnectionSocketFactory(sslContext);

    }