查询JDK默认支持的SSL/TSL版本

public static void main(String[] args) throws Exception {
        SSLContext context = SSLContext.getInstance("TLS");
        context.init(null, null, null);

        SSLSocketFactory factory = (SSLSocketFactory) context.getSocketFactory();
        SSLSocket socket = (SSLSocket) factory.createSocket();

        String[] protocols = socket.getSupportedProtocols();

        System.out.println("Supported Protocols: " + protocols.length);
        for (int i = 0; i < protocols.length; i++) {
            System.out.println(" " + protocols[i]);
        }

        protocols = socket.getEnabledProtocols();

        System.out.println("Enabled Protocols: " + protocols.length);
        for (int i = 0; i < protocols.length; i++) {
            System.out.println(" " + protocols[i]);
        }

    }