createSocket() 过了很长时间才返回

Question

我的代码假设与某个对等方启动 SSL 套接字，提取证书并关闭套接字。问题是，createSocket()似乎阻塞了很长时间。如何设置合理的超时时间？这是我的完整代码：public static void main(String[] args) throws Exception {        SSLContext sslCtx;        sslCtx = SSLContext.getInstance("TLSv1.2");        sslCtx.init(null, new TrustManager[]{new X509TrustManager() {            private X509Certificate[] accepted;            @Override            public void checkClientTrusted(X509Certificate[] xcs, String string) {            }            @Override            public void checkServerTrusted(X509Certificate[] xcs, String string) {                accepted = xcs;            }            @Override            public X509Certificate[] getAcceptedIssuers() {                return accepted;            }        }}, null);        System.out.println("start ....");        try (SSLSocket sslSocket = (SSLSocket) sslCtx.getSocketFactory().createSocket("156.70.54.68", 443)) {            sslSocket.setSoTimeout(5_000);            Certificate[] certificates = sslSocket.getSession().getPeerCertificates();            System.out.println(certificates.length);        } catch (Exception e) {            System.out.println(e);        }    }

Answer 1

不要先调用socket(String, int)，然后调用socket()，然后定义超时，然后调用connect(InetSocketAddress, int)，它采用 int 作为超时值。

    try (SSLSocket sslSocket = (SSLSocket) sslCtx.getSocketFactory().createSocket()) {

        sslSocket.setSoTimeout(5_000);

        Certificate[] certificates = sslSocket.getSession().getPeerCertificates();

        System.out.println(certificates.length);

        sslSocket.connect(new InetSocketAddress("156.70.54.68", 443), 5_000);

    } catch (Exception e) {

        System.out.println(e);

    }