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);    }