拿 SSLSocketFactory 通过 SSLContext.getSocketFactory（）获取并将其包装在 SSLSocketFactory 的自定义子类中，该委托代理从 SSLContext 获得的那个，但在 createSocket（）中也设置了所需的密码。

Take the SSLSocketFactory obtained by SSLContext.getSocketFactory() and wrap it in a custom subclass of SSLSocketFactory, which delegates to the one obtained from SSLContext, but in createSocket() also sets the required cipher.