部署linux服務器上後https接口請求拋異常javax.net.ssl.SSLHandshakeException

       接口中用到https的URL請求服務，本地測試正常。部署到linux服務器上後，請求調不通，拋出瞭如下異常，截取了片段：

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
        at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)

Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
        at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:387)

Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
        at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:145)

        HTTPS請求涉及證書祕鑰驗證，一般請求第三方服務，很少去安裝配置對端的數字證書和校驗。只能採用繞過數字證書校驗了，對代碼進行改造，添加處理代碼如下：

public static String doPost(String url, String param){
        // 構建POST請求
        HttpPost httpost = new HttpPost(url);
        httpost.addHeader("Content-Type", "application/json");
        // 添加Header 驗證信息
        httpost.addHeader("Authorization", "Bearer xyv-dcs-gua-ugu-ayde2j");
        HttpEntity httpEntity = new StringEntity(param, "utf-8");
        httpost.setEntity(httpEntity);
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectTimeout(5000).setConnectionRequestTimeout(5000)
                .setSocketTimeout(8000).build();
        httpost.setConfig(requestConfig);
        String respJson = "";
        SSLContext sslContext = null;
        try {
            sslContext = SSLContexts.custom().loadTrustMaterial(null, new TrustStrategy() {
                @Override
                public boolean isTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
                    return true;
                }
            }).build();
        } catch (NoSuchAlgorithmException e) {
            e.getStackTrace();
        } catch (KeyManagementException e) {
            e.getStackTrace();
        } catch (KeyStoreException e) {
            e.getStackTrace();
        }
        try (CloseableHttpClient httpclient = HttpClients.custom().setSSLContext(sslContext).
                setSSLHostnameVerifier(new NoopHostnameVerifier()).build()){
            logger.info("上送報文:" + param);
            HttpResponse response = httpclient.execute(httpost);
            respJson = EntityUtils.toString(response.getEntity(), "UTF-8");
            logger.info("返回報文:" + respJson);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return respJson;
    }