java - 套接字在命令行上工作但在 Swing 上失败

Question

这个问题是这个问题的后续问题: BufferedReader readLine method hangs and block program

我现在有一个服务器和一个可以流畅运行的客户端，但后来我尝试使用swing实现一个GUI界面。使用相同的代码，套接字构造函数失败。

我的课是这样的:

public class TCPClient {

    public BufferedWriter ostream = null;
    public BufferedReader istream = null;
    public TCPClient(String host, String port) throws UnknownHostException {
    InetAddress ip = InetAddress.getByName(host);

    try {
        Socket socket = new Socket(host, Integer.parseInt(port));

        ostream = new BufferedWriter(socket.getOutputStream());
        istream = new BufferedReader(new InputStreamReader(socket.getInputStream()));


    } catch (IOException ex) {
        Logger.getLogger(TCPClient.class.getName()).log(Level.SEVERE, null, ex);
    }

}

当从主函数调用时，这段代码工作得很好。在 swing 中，我有一个调用以下方法的按钮:

private void enviarMsgTCP() throws IOException {
    screenOutput.append("Sent:\n" + mensagem.getText() + "\n");
    if (client == null){
        try {
            client = new TCPClient(destIp.getText(), port.getText());
        } catch (UnknownHostException ex) {
            Logger.getLogger(GUI.class.getName()).log(Level.SEVERE, null, ex);
            saidaTexto.append("Não foi possível se conectar ao host.\n");
        }
    }

使用此代码，下面的行(在 TCPClient 中)抛出异常:

Socket socket = new Socket(host, Integer.parseInt(port));

异常堆栈跟踪:

21/10/2011 21:44:42 cliente.ClienteTCP <init>
GRAVE: null
java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at java.net.Socket.<init>(Socket.java:375)
at java.net.Socket.<init>(Socket.java:218)

它可以是什么？再次感谢

Answer 1

连接被拒绝意味着您在连接时指定的 IP:端口没有任何监听。

你怎么还有DataOutputStream？