createSocket()在很长时间后返回

Question

我的代码假设向某个对等体发起一个SSL套接字，提取证书并关闭套接字。

问题是，createSocket()似乎阻塞了很长一段时间。如何设置合理的超时时间？

下面是我的完整代码：

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

不是调用socket(String，int)，而是调用socket()，然后调用socket()，然后定义超时，并调用connect(InetSocketAddress，int)，它将int作为超时参数。

    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);
    }