1.使用HttpURLConnection发送请求

private static void trustAllCertificates(HttpURLConnection con) throws NoSuchAlgorithmException, KeyManagementException {
        ((HttpsURLConnection) con).setHostnameVerifier(new HostnameVerifier() {
            public boolean verify(String hostname, SSLSession session) {
                return true;
            }
        });
        // 创建一个信任所有证书的TrustManager
        TrustManager ignoreCertificationTrustManger = new X509TrustManager() {
            public void checkClientTrusted(X509Certificate certificates[], String authType) throws CertificateException {

            }

            public void checkServerTrusted(X509Certificate[] ax509certificate, String s) throws CertificateException {

            }

            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }

        };
        // 初始化SSLContext
        TrustManager[] tm = { ignoreCertificationTrustManger };
        SSLContext sslContext = SSLContext.getInstance("SSL");
        sslContext.init(null, tm, new java.security.SecureRandom());

        // 从上述SSLContext对象中得到SSLSocketFactory对象
        SSLSocketFactory ssf = sslContext.getSocketFactory();
        ((HttpsURLConnection) con).setSSLSocketFactory(ssf);
    }

在发送请求时，在HttpURLConnection声明后调用上述方法，如下：

HttpURLConnection connection = (HttpURLConnection) postURL.openConnection();
trustAllCertificates(connection);

2.使用HttpClient 发送请求

    public static HttpClient create() throws KeyManagementException, NoSuchAlgorithmException {
        // 创建一个信任所有证书的TrustManager
        TrustManager[] trustAllCerts = new TrustManager[]{
            new X509TrustManager() {
                public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                    return null;
                }
                public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType) {
                }
                public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType) {
                }
            }
        };
 
        // 初始化SSLContext
        SSLContext sslContext = SSLContext.getInstance("SSL");
        sslContext.init(null, trustAllCerts, new SecureRandom());
 
        // 创建使用我们SSLContext的SSLConnectionSocketFactory
        SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslContext, SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
 
        // 创建配置了我们SSLConnectionSocketFactory的HttpClient
        HttpClient httpClient = HttpClients.custom()
            .setSSLSocketFactory(sslSocketFactory)
            .build();
 
        return httpClient;
    }

调用时如下，用上述方法声明 HttpClient即可：

HttpClient httpClient = create();
或者
CloseableHttpClient httpClient = (CloseableHttpClient)create();