我正在使用 Java Sockets 创建一个聊天应用程序,并且得到了SocketException: socket closed
关闭服务器时。我收到错误即使我从未尝试连接客户端- 只是停止服务器将会出现此套接字关闭异常。
我知道错误意味着什么,我试图在套接字关闭后访问它,但我不明白为什么会发生这种情况。
public ServerSocket server_socket;
new ConnectionThread(server_back_end);
class ConnectionThread extends Thread implements Runnable, Serializable
{
public ServerBackEnd server_back_end;
public ConnectionThread(ServerBackEnd server_back_end) /*constructor*/
{
this.server_back_end = server_back_end;
start();
}
@Override
public void run()
{
try
{
server_back_end.server_socket = new ServerSocket(8080);
server_back_end.server_front_end.display("<<SERVER STARTED>>");
while (server_back_end.running)
add_incoming_clients();
}
catch (Exception e)
{
e.printStackTrace(); //this gets thrown when I stop server
}
}//end run()
我认为问题出在 add_incoming_clients() 中,因为当我注释掉该调用时,它不会抛出错误。尽管我没有与任何客户打交道,但在现场还是发生了一些事情accept()
method:
public void add_incoming_clients() throws IOException, ClassNotFoundException
{
Socket client_socket = server_back_end.server_socket.accept(); //line 172
ClientInfo new_client = new ClientInfo(
new ObjectOutputStream(client_socket.getOutputStream()),
new ObjectInputStream(client_socket.getInputStream()));
//...
//...
}
这是我停止服务器时的代码::
public void stop()
{
if (running)
try
{
running = false;
server_socket.close();
server_front_end.display("<<SERVER TERMINATED>>");
}
catch (IOException e)
{
System.out.println("stop server exception, is not the problem");
}
}//end stop()
有人可以解释我必须做什么才能正确关闭它而没有例外吗?
这是错误(第 172 行似乎是罪魁祸首,但我不明白为什么)
java.net.SocketException: socket closed
at java.net.DualStackPlainSocketImpl.accept0(Native Method)
at java.net.DualStackPlainSocketImpl.socketAccept(DualStackPlainSocketImpl.java:131)
at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:409)
at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:199)
at java.net.ServerSocket.implAccept(ServerSocket.java:545)
at java.net.ServerSocket.accept(ServerSocket.java:513)
at ConnectionThread.add_incoming_clients(ServerBackEnd.java:172)
at ConnectionThread.run(ServerBackEnd.java:159)