Multithreading 如何在JavaFX中实时更新textarea(控制台),而不丢失流或冻结应用程序
我是新的JFX,我正在努力解决这个问题。我正在尝试运行一个简单的模拟,它必须将输出(system.out和system.err)打印到textareaMultithreading 如何在JavaFX中实时更新textarea(控制台),而不丢失流或冻结应用程序,multithreading,javafx,concurrency,javafx-8,Multithreading,Javafx,Concurrency,Javafx 8,我是新的JFX,我正在努力解决这个问题。我正在尝试运行一个简单的模拟,它必须将输出(system.out和system.err)打印到textarea public class ConsoleController { @FXML public TextArea consoleLogscreen; private class Console extends OutputStream { @Override public void wri
public class ConsoleController {
@FXML
public TextArea consoleLogscreen;
private class Console extends OutputStream {
@Override
public void write(int b) throws IOException {
consoleLogscreen.appendText(String.valueOf((char) b));
}
}
@FXML
public void initialize() throws IOException {
Console console = new Console();
PrintStream ps = new PrintStream(console, true);
System.setOut(ps);
System.setErr(ps);
System.err.flush();
System.out.flush();
}
}
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
模拟控制器:
public class SimulationController {
@FXML
private Button homebutton;
@FXML
private Button abortbutton;
private volatile Service<Void> backgroundThread;
private volatile Thread t;
private volatile Simulate sim;
@FXML
public void initialize() {
sim = new Simulate();
t = new Thread(sim);
backgroundThread = new Service<Void>() {
@Override
protected Task<Void> createTask() {
return new Task<Void>() {
@Override
protected Void call() throws Exception {
t.run();
return null;
}
};
}
};
backgroundThread.setOnCancelled(new EventHandler<WorkerStateEvent>() {
@Override
public void handle(WorkerStateEvent event) {
t.interrupt();
sim.shutDown(true);
}
});
backgroundThread.restart();
abortbutton.setDisable(false);
homebutton.setDisable(true);
}
@FXML
void onAbortClicked(ActionEvent event) throws IOException {
if (event.getSource() == abortbutton) {
backgroundThread.cancel();
}
}
@FXML
void onHomeClicked(ActionEvent event) throws IOException {
if (event.getSource() == homebutton) {
Utility.getHome((Stage) homebutton.getScene().getWindow());
}
}
}
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
公共类模拟控制器{
@FXML
私人按钮主页按钮;
@FXML
专用按钮中止按钮;
私有易失性服务后台线程;
私有易失性线程t;
私有易失性模拟sim;
@FXML
公共无效初始化(){
sim=新模拟();
t=新螺纹(sim);
backgroundThread=新服务(){
@凌驾
受保护的任务createTask(){
返回新任务(){
@凌驾
受保护的Void调用()引发异常{
t、 run();
返回null;
}
};
}
};
backgroundThread.setOnCancelled(新的EventHandler(){
@凌驾
公共无效句柄(WorkerStateEvent事件){
t、 中断();
模拟关机(真);
}
});
backgroundThread.restart();
abortbutton.setDisable(false);
homebutton.setDisable(真);
}
@FXML
void onAbortClicked(ActionEvent事件)引发IOException{
if(event.getSource()==abortbutton){
backgroundThread.cancel();
}
}
@FXML
void onHomeClicked(ActionEvent事件)引发IOException{
if(event.getSource()==homebutton){
getHome((Stage)homebutton.getScene().getWindow());
}
}
}
Simulation.fxml:
<Pane prefHeight="500.0" prefWidth="750.0"xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.jfxabstract.view.SimulationController">
<children>
<Button fx:id="abortbutton" alignment="CENTER" contentDisplay="CENTER" layoutX="250.0" layoutY="430.0" mnemonicParsing="false" onAction="#onAbortClicked" styleClass="custombutton" text="Abort" textAlignment="CENTER" />
<Button fx:id="homebutton" alignment="CENTER" contentDisplay="CENTER" layoutX="450.0" layoutY="430.0" mnemonicParsing="false" onAction="#onHomeClicked" styleClass="custombutton" text="Home" textAlignment="CENTER" />
<fx:include source="Console.fxml" />
</children>
</Pane>
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
我正在使用javafx.concurrent.service运行我的任务,但应用程序处于冻结状态,而且打印输出也不是实时的
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
谁能告诉我哪里出了问题
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
提前谢谢
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
更新:
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
run方法从数据库检索数据,并通过调用同一类中的其他方法来运行少量验证。对于简单的抽象应用程序,我使用这个
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
public void run(){
长i=1;
而(i<90){
double k=Math.sqrt(Math.pow(i,2)/Math.sqrt(i));
系统输出打印项次(“i:+i+”计数:+k);
如果(!关机){
打破
}
i++;
}
}
严格来说,必须通过fx应用程序线程访问场景图中的所有节点。为了在您的上下文中保证该规则,您可以将appendText包装到Platform.runlater()中,类似于:
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
public class ConsoleController {
@FXML
public TextArea consoleLogscreen;
private class Console extends OutputStream {
@Override
public void write(int b) throws IOException {
Platform.runLater(() ->
consoleLogscreen.appendText(String.valueOf((char) b));
}
}
}
@FXML
public void initialize() throws IOException {
Console console = new Console();
PrintStream ps = new PrintStream(console, true);
System.setOut(ps);
System.setErr(ps);
System.err.flush();
System.out.flush();
}
}
(未测试,只是复制并调整了代码)如果不想使用
Platform.runLater()
方法,可以使用表示任务(服务)结果的value属性:
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
下面是一个完整的示例:
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
simulation.xml
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<Pane prefHeight="563.0" prefWidth="750.0" xmlns="http://javafx.com/javafx/8.0.40" xmlns:fx="http://javafx.com/fxml/1" fx:controller="SimulationController">
<children>
<ProgressBar fx:id="progressBar" layoutX="309.0" layoutY="14.0" prefHeight="18.0" prefWidth="162.0" progress="0.0" />
<Button fx:id="abortbutton" alignment="CENTER" contentDisplay="CENTER" layoutX="250.0" layoutY="520.0" mnemonicParsing="false" onAction="#onAbortClicked" styleClass="custombutton" text="Abort" textAlignment="CENTER" />
<Button fx:id="homebutton" alignment="CENTER" contentDisplay="CENTER" layoutX="450.0" layoutY="520.0" mnemonicParsing="false" onAction="#onHomeClicked" styleClass="custombutton" text="Home" textAlignment="CENTER" />
<TextArea fx:id="consoleLogscreen" layoutX="15.0" layoutY="10.0" prefHeight="487.0" prefWidth="287.0" wrapText="true" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0" />
<Label fx:id="progress" layoutX="484.0" layoutY="15.0" text="Label" />
</children>
</Pane>
模拟控制器类
public void run() {
long i = 1;
while (i < 90) {
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
System.out.println("i: " + i + " Count: " + k);
if (!shutdown) {
break;
}
i++;
}
}
import java.net.URL;
import java.util.ResourceBundle;
import javafx.beans.binding.When;
import javafx.concurrent.Service;
import javafx.concurrent.Task;
import javafx.concurrent.WorkerStateEvent;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressBar;
import javafx.scene.control.TextArea;
/**
* FXML Controller class
*
* @author
*/
public class SimulationController implements Initializable {
@FXML
private Button abortbutton;
@FXML
private Button homebutton;
private volatile Service<String> backgroundThread;
@FXML
private TextArea consoleLogscreen;
@FXML
private ProgressBar progressBar;
@FXML
private Label progress;
/**
* Initializes the controller class.
*/
@Override
public void initialize(URL url, ResourceBundle rb) {
backgroundThread = new Service<String>() {
@Override
protected Task<String> createTask() {
return new Task<String>() {
StringBuilder results = new StringBuilder();
@Override
protected String call() throws Exception {
long i = 1;
String s = null;
while (i < 90) {
if(isCancelled()){
break;
}
double k = Math.sqrt(Math.pow(i, 2) / Math.sqrt(i));
results.append("i: ").append(i).append(" Count: ").append(k).append("\n");
updateValue(results.toString());
updateProgress((100*i)/90, 90);
Thread.sleep(100);
i++;
}
return results.toString();
}
};
}
};
consoleLogscreen.textProperty().bind(backgroundThread.valueProperty());
progressBar.progressProperty().bind(backgroundThread.progressProperty());
progress.textProperty().bind(new When(backgroundThread.progressProperty().isEqualTo(-1)).then("Unknown")
.otherwise(backgroundThread.progressProperty().multiply(100).asString("%.2f%%")));
backgroundThread.start();
backgroundThread.setOnCancelled(new EventHandler<WorkerStateEvent>() {
@Override
public void handle(WorkerStateEvent event) {
}
});
backgroundThread.restart();
abortbutton.setDisable(false);
homebutton.setDisable(true);
}
@FXML
private void onAbortClicked(ActionEvent event) {
if (event.getSource() == abortbutton) {
backgroundThread.cancel();
}
}
@FXML
private void onHomeClicked(ActionEvent event) {
}
}
import java.net.URL;
导入java.util.ResourceBundle;
导入javafx.beans.binding.When;
导入javafx.concurrent.Service;
导入javafx.concurrent.Task;
导入javafx.concurrent.WorkerStateEvent;
导入javafx.event.ActionEvent;
导入javafx.event.EventHandler;
导入javafx.fxml.fxml;
导入javafx.fxml.Initializable;
导入javafx.scene.control.Button;
导入javafx.scene.control.Label;
导入javafx.scene.control.ProgressBar;
导入javafx.scene.control.TextArea;
/**
*FXML控制器类
*
*@作者
*/
公共类SimulationController实现可初始化{
@FXML
专用按钮中止按钮;
@FXML
私人按钮主页按钮;
私有易失性服务后台线程;
@FXML
私人文本区控制台屏幕;
@FXML
私人ProgressBar ProgressBar;
@FXML
自有品牌进展;
/**
*初始化控制器类。
*/
@凌驾
公共void初始化(URL、ResourceBundle rb){
backgroundThread=新服务(){
@凌驾
受保护的任务createTask(){
返回新任务(){
StringBuilder结果=新建StringBuilder();
@凌驾
受保护的字符串调用()引发异常{
长i=1;
字符串s=null;
而(i<90){
如果(isCancelled()){
打破
}
double k=Math.sqrt(Math.pow(i,2)/Math.sqrt(i));
结果.append(“i:”).append(i).append(“Count:”).append(k).append(“\n”);
updateValue(results.toString());
updateProgress((100*i)/90,90);
睡眠(100);
i++;
}
返回结果。toString();
}
};
}
};
consoleLogscreen.textProperty().bind(backgroundThread.valueProperty());
progressBar.progressProperty().bind(backgroundThread.progressProperty());
progress.textProperty().bind(当(backgroundThread.progressProperty().isEqualTo(-1))时为新的,然后为(“未知”)
。否则(backgroundThread.progressProperty().multiply(100).asString(“%.2f%%”);
backgroundThread.start();
backgroundThread.setOnCancelled(新的EventHandler(){
@凌驾
公共无效句柄(WorkerStateEvent事件){
}
});
backgroundThread.restart();
abortbutton.setDisable(false);
homebutton.setDisable(真);
}
@FXML
onAbortClicked的私有无效(ActionEvent事件){
if(event.getSo)