java - 在线程中刷新 Java FX 窗口
问题描述
我有客户端-服务器应用程序,客户端有两个线程,一个用于向服务器发送信息,另一个用于显示正在更改的窗口,但出现错误。我读过一些关于 Platform.runlater 的东西,但我不知道如何使用它。这是带有窗口的类:
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;
public class B implements Runnable{
private int counter = 0, lg;
private double x_1, x_2, y_1, y_2;
int [] bts = new int[2];
Button[] change_bts = new Button[2];
Button [] all_bts = new Button[221];
public void run() {
Group grupa = new Group();
int x = 0;
int ctr = 1;
for (int i = 0; i < 17; ++i) {
for (int j = 0; j < 13; ++j) {
if ( i%2 == 1) { x = 30; }
else { x = 0; }
Button bt = new Button();
bt.setLayoutX(x+30+j*60); bt.setLayoutY(30+i*60);
bt.setOnAction(
event -> {
if((bt.getText()!="0")) {
if ((counter == 1)) {
change_bts[counter] = bt;
bts[0] = Integer.parseInt(change_bts[0].getText());
bts[1] = Integer.parseInt(change_bts[1].getText());
}
else if (counter == 0) {
change_bts[counter] = bt;
counter++;
}
}
System.out.println(bt.getText());
}
);
all_bts[ctr-1] = bt;
ctr ++;
}
}
grupa.getChildren().addAll(all_bts);
Scene tsc = new Scene(grupa, 1100, 1200);
Stage tst = new Stage(); //New window (Stage)
tst.setScene(tsc);
tst.show();
}
}
这是创建新线程的类:
import javafx.application.Application;
import javafx.stage.Stage;
import java.io.IOException;
public class Clients extends Application {
public static void main(String[] args) { launch(args);}
public void start(final Stage first_stage) throws IOException, InterruptedException {
Names n = new Names (); // this Class' constructor calls gogo() method below
}
public static void gogo(String a) {
Runnable[] runners = new Runnable[2];
Thread[] threads = new Thread[2];
runners[0] = new B();
runners[1] = new Another_Class();
threads[0] = new Thread(runners[0]);
threads[1] = new Thread(runners[1]);
threads[0].start();
threads[1].start();
}
}
请帮忙:<
解决方案
考虑将客户端所需的信息封装在一个单独的类(通常称为模型)中。
客户端(视图)应该响应模型的变化。在以下示例中,它通过绑定来实现。
现在您可以使用线程来更新模型:
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
public class Clients extends Application {
public static void main(String[] args) { launch(args);}
@Override
public void start(final Stage first_stage) throws IOException, InterruptedException {
Model model = new Model();
Button run = new Button("Run");
run.setOnAction(e -> {
gogo(model);
run.setDisable(true);
});
Label counter = new Label();
counter.textProperty().bind(model.getCounterProperty().asString());
BorderPane root = new BorderPane(counter);
root.setBottom(run);
Scene scene = new Scene(root);
first_stage.setScene(scene);
first_stage.show();
}
private void gogo(Model model) {
//thread manipulates model
new Thread(new Updater(model)).start();
}
}
class Updater implements Runnable{
private final Model model;
private int counter = 0;
private boolean stop = false;
public Updater(Model model) {
this.model = model;
}
@Override
public void run() {
while (! stop){
model.setCounter(++counter);
try {
TimeUnit.MILLISECONDS.sleep(1000);
} catch (InterruptedException ex) { ex.printStackTrace();}
}
}
void setStop(boolean stop) {this.stop = stop; }
}
//use a model to encapsulate information needed for the view
class Model {
private final SimpleIntegerProperty counterProperty = new SimpleIntegerProperty(0);
SimpleIntegerProperty getCounterProperty() { return counterProperty; }
//use `Platform.runLater` to allow update from non javafx thread
//if updated by more than one thread it needs to be synchronized
void setCounter(int value) {
Platform.runLater(() -> counterProperty.set(value) );
}
}
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