最近我们在客户端应用程序连接到服务器时遇到了 SocketTimeoutException。客户端应用程序使用 Axis1.4 作为 SOAP 引擎。我们已经将套接字的连接超时和读取超时设置为 20 秒，但看起来连接超时值不起作用。
深入了解 JDK 中的套接字创建之后，使用的套接字工厂是sun.security.ssl.SSLSocketFactoryImpl，而套接字 impl 是sun.security.ssl.SSLSocketImpl。问题在于 SSLSocketImpl 的初始化，它将连接超时值硬编码为 0，这意味着没有超时：
SSLSocketImpl(SSLContextImpl context, InetAddress host, int port)
throws IOException {
super();
init(context, false);
SocketAddress socketAddress = new InetSocketAddress(host, port);
connect(socketAddress, 0);
}
连接方法是：
/**
* Connects this socket to the server with a specified timeout
* value.
*
* This method is either called on an unconnected SSLSocketImpl by the
* application, or it is called in the constructor of a regular
* SSLSocketImpl. If we are layering on top on another socket, then
* this method should not be called, because we assume that the
* underlying socket is already connected by the time it is passed to
* us.
*
* @param endpoint the <code>SocketAddress</code>
* @param timeout the timeout value to be used, 0 is no timeout
* @throws IOException if an error occurs during the connection
* @throws SocketTimeoutException if timeout expires before connecting
*/
public void connect(SocketAddress endpoint, int timeout)
throws IOException {
if (self != this) {
throw new SocketException("Already connected");
}
if (!(endpoint instanceof InetSocketAddress)) {
throw new SocketException(
"Cannot handle non-Inet socket addresses.");
}
super.connect(endpoint, timeout);
doneConnect();
}
为什么 sun 的实现硬编码为 0？这是一个错误吗？从这里看应用程序需要自己处理超时，这很奇怪。