我有一个在服务器(服务器 A)上运行的程序,它在一个端口上侦听外部连接(来自外部服务器,B),然后在另一个端口上侦听同一服务器(服务器 A)上的内部连接。然后它将数据从内部连接传递到外部连接并再次返回。
我想知道是否有一种方法可以检测到外部客户端已断开连接。我一次只需要一个外部连接,但如果外部客户端重新启动或类似情况,我希望能够接受一个新连接。
这个套接字级别的东西对我来说都是相当新的,所以如果有更好的方法来解决这个问题,我会全神贯注。一个规定是服务器 B 上运行的客户端必须是发起连接的客户端,并且连接必须尽可能长。
public void handleConnection() {
System.out.println("Waiting for client message...");
try {
SSLSocket extSocket = (SSLSocket) this.externalServerSocket.accept();
ObjectInputStream externalOis = new ObjectInputStream(extSocket.getInputStream());
ObjectOutputStream externalOos = new ObjectOutputStream(extSocket.getOutputStream());
System.out.println("Client connection establisthed");
// Loop here to accept all internal connections
while (true) {
SSLSocket internalSocket = (SSLSocket) this.internalServerSocket.accept();
new ConnectionHandler(externalOis, externalOos, internalSocket);
}
} catch (IOException e) {
System.err.println(e.getMessage());
return;
}
}
class ConnectionHandler implements Runnable {
private SSLSocket internalSocket;
private ObjectOutputStream internalOos;
private ObjectInputStream internalOis;
private ObjectInputStream externalOis;
private ObjectOutputStream externalOos;
public ConnectionHandler(ObjectInputStream externalOis,
ObjectOutputStream externalOos, SSLSocket internalSocket) {
this.internalSocket = internalSocket;
try {
this.internalOis = new ObjectInputStream(this.internalSocket.getInputStream());
this.internalOos = new ObjectOutputStream(this.internalSocket.getOutputStream());
this.externalOis = externalOis;
this.externalOos = externalOos;
} catch (IOException e) {
System.err.println(e.getMessage());
}
new Thread(this).start();
}
@Override
public void run() {
try
{
// process data
Object o = internalOis.readObject();
externalOos.writeObject(o);
Object o2 = externalOis.readObject();
internalOos.writeObject(02);
internalOos.close();
internalOis.close();
this.internalSocket.close();
} catch (IOException e) {
System.err.println(e.getMessage());
} catch (ClassNotFoundException e) {
System.err.println(e.getMessage());
}
}
}