在接受的套接字上调用close（）之前，Java ServerSocket将不接受新连接

In my code (below) the the serverSocket won't accept a new connection until a thread deals with the existing connection and calls close() on the socket that serverSocket.accept() created. If i start this server and open two tabs in the browser then only one of the tabs connects and the other is left waiting until the other tab finishes (which it doesn't) before serverSocket.accept() will accept a new connection. How can i accept a new connection without closing the previous one?In my code (below) the the serverSocket won't a