Question

我遇到了一些麻烦，无法真正找到回答。

我需要经常将字符串添加到TextArea。字符串来自其他类/对象。

我的想法：

@FXML
private static TextArea TAactivity;

public static void activity(String s) {
    TAactivity.appendText(s);
}

并从其他类写入：

MainController.activity("Random stuff");

我做错了什么？

问候

//修改

public class Main extends Application {
private final int PORT = 4000;
private final String SERVER = "127.0.0.1";
public static Client client;
@Override
public void start(Stage primaryStage) throws Exception{
    client = new Client(SERVER, PORT);
    Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
    primaryStage.setTitle("JJFTP Client");
    primaryStage.setScene(new Scene(root));
    primaryStage.show();
  }
}
public class Client {

private String server;
private int port;

public Client(String s, int p) throws InterruptedException, IOException {
    server = s;
    port = p;
}
public String messagefromserver() throws IOException {
    Controller.c.activity("Waiting for message from server");
    StringBuilder sb;
    Socket socket = new Socket(server, port);
    DataInputStream ASCIIin = new DataInputStream(socket.getInputStream());
    int inputlength = ASCIIin.readInt();
    sb = new StringBuilder();
    for (int i = 0; i < inputlength; i++) {
        int temp = ASCIIin.readInt();
        if (temp < 0) {
            throw new IllegalArgumentException();
        }
        sb.append((char) temp);
    }
    Controller.c.activity("Received -" + sb + "- from server");
    ASCIIin.close();
    socket.close();
    return sb.toString();
  }
}
public class Controller implements Initializable {

public static Controller c;

@FXML
private TextArea TAfiles;
@FXML
private TextField TFcmd;
@FXML
private TextArea TAactivity;

@FXML
public void send() throws Exception {
    String s = TFcmd.getText();
    TFcmd.setText("");
    Main.client.messagetoserver(s);
    String answere = Main.client.messagefromserver();
    if (answere.equals("FILE")) {
        StringBuilder sb = new StringBuilder();
        sb.append(s);
        sb.delete(0, 9);
        Main.client.downloadfile(String.valueOf(sb));
        updatefilelist();
        activity("Filelist updated");
    }
}

public void activity(String s) {
    System.out.println(s);
    TAactivity.setText(TAactivity.getText() + "\n" + s);
}

@Override
public void initialize(URL location, ResourceBundle resources) {
    c=new Controller();
    try {
        updatefilelist();
    } catch (IOException e) {
        e.printStackTrace();
    }
  }
}

当然有更多方法，但我猜不是所有方法都是必要的。如果我从Client和/或对象的对象中删除静态，它表示它不能从非静态上下文中引用静态的东西。

JavaFX从另一个类写入TextArea

0 个答案: