Question

我是JavaFX和JavaFX Scene Builder的新手，并且一直在研究并试图弄清楚如何简单地从文本文件中读取并在textarea中显示其内容。我的控制器类中有一个很好的文件读取功能，但我无法弄清楚如何将文本文件显示到fxml文档中的文本区域。我已经学会了如何单击按钮并使文件显示在文本区域中，但是我想在GUI加载后立即在文本区域中显示内容。如果有人知道如何做到这一点，我们将非常感谢您的帮助！

最后一个按钮和文本区域（朝向FXML文档的末尾）是将我的文本文件打印到netbeans的按钮，以及我希望将文本显示在其中的文本区域。

这是我的代码：

控制器

import java.io.File;
import java.io.FileNotFoundException;
import java.net.URL;
import java.util.ResourceBundle;
import java.util.Scanner;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;


public class Screen2Controller implements Initializable , ControlledScreen {

    ScreensController myController;

    @Override
    public void initialize(URL url, ResourceBundle rb) {
        // TODO
    }

    public void setScreenParent(ScreensController screenParent){
        myController = screenParent;
    }

    @FXML
    private void goToScreen1(ActionEvent event){
       myController.setScreen(ScreensFramework.screen1ID);
    }

    @FXML
    private void goToProgram(ActionEvent event){
       myController.setScreen(ScreensFramework.programID);
    }

    private void displayText() throws FileNotFoundException {
        Scanner s = new Scanner (new File ("EECS.txt")).useDelimiter("\\s+");
        while (s.hasNext()) {
            if (s.hasNextInt()) { // check if next token is an int
                System.out.print(s.nextInt()+" "); // display the found integer
            }       
            else {
                System.out.print(s.next()+" "); // else read the next token
            }
        } //end while
    } //end main   
} //end screen2controller

FXML

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.image.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.text.*?>

<AnchorPane id="AnchorPane" prefHeight="650.0" prefWidth="1350.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="departmentdisplay.Screen2Controller">
  <children>
      <ImageView fitHeight="783.0" fitWidth="1398.0" layoutX="-4.0" layoutY="-80.0" pickOnBounds="true" preserveRatio="true">
         <image>
            <Image url="@nexus_blue.jpg" />
         </image>
      </ImageView>
      <ImageView fitHeight="149.0" fitWidth="1322.0" layoutX="20.0" layoutY="7.0" pickOnBounds="true" preserveRatio="true">
         <image>
            <Image url="@departinfohead.png" />
         </image>
      </ImageView>
  <Button layoutX="49.0" layoutY="26.0" mnemonicParsing="false" onAction="#goToScreen1" prefHeight="111.0" prefWidth="121.0">
         <graphic>
            <ImageView fitHeight="100.0" fitWidth="150.0" pickOnBounds="true" preserveRatio="true">
               <image>
                  <Image url="@backarrow.png" />
               </image>
            </ImageView>
         </graphic></Button>
      <SplitPane dividerPositions="0.20765027322404372" layoutX="928.0" layoutY="168.0" orientation="VERTICAL" prefHeight="185.0" prefWidth="415.0">
         <items>
            <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="95.0" prefWidth="183.0">
               <children>
                  <Label layoutX="14.0" layoutY="23.0" prefHeight="96.0" prefWidth="158.0" text="                      Map" textAlignment="CENTER" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
                     <font>
                        <Font name="Arial Black" size="24.0" />
                     </font>
                  </Label>
               </children>
            </AnchorPane>
            <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="176.0" prefWidth="158.0">
               <children>
                  <TextArea prefHeight="151.0" prefWidth="242.0" text="Image" wrapText="true" AnchorPane.bottomAnchor="-7.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">       
                  </TextArea>
               </children>
            </AnchorPane>
         </items>
      </SplitPane>
      <SplitPane dividerPositions="0.08057851239669421" layoutX="20.0" layoutY="168.0" orientation="VERTICAL" prefHeight="480.0" prefWidth="898.0">
         <items>
            <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="100.0" prefWidth="160.0">
               <children>
                  <Label layoutX="369.0" prefHeight="29.0" prefWidth="1062.0" text="                  Electrical Engineering &amp; Computer Science" textAlignment="CENTER" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
                     <font>
                        <Font name="Arial Black" size="24.0" />
                     </font>
                  </Label>
               </children>
            </AnchorPane>
            <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="100.0" prefWidth="160.0">
               <children>
                  <TextArea fx:id="dinfoTextArea" layoutY="3.0" prefHeight="453.0" prefWidth="896.0" 
                 text="Text file text goes here" wrapText="true"
                  AnchorPane.bottomAnchor="-14.0" AnchorPane.leftAnchor="0.0"
                   AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="3.0">
                     </TextArea>
               </children>
            </AnchorPane>
         </items>
      </SplitPane>
      <SplitPane dividerPositions="0.13286713286713286" layoutX="930.0" layoutY="365.0" orientation="VERTICAL" prefHeight="282.0" prefWidth="413.0">
         <items>
            <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="50.0" prefWidth="221.0">
               <children>
                  <Label layoutX="92.0" layoutY="12.0" prefHeight="29.0" prefWidth="263.0" text="                  Programs" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
                     <font>
                        <Font name="Arial Black" size="24.0" />
                     </font>
                  </Label>
              <Button layoutX="25.0" mnemonicParsing="false" onAction="#displayText" prefHeight="34.0" prefWidth="102.0" text="Go To Programs" />
               </children>
            </AnchorPane>
            <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="176.0" prefWidth="158.0">
               <children>
                  <TextArea layoutX="57.0" layoutY="-6.0" prefHeight="339.0" prefWidth="240.0"
                      text="Lorem ipsum " wrapText="true" AnchorPane.bottomAnchor="0.0"
                      AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" 
                      AnchorPane.topAnchor="0.0"> 
                  </TextArea>
               </children>
            </AnchorPane>
         </items>
      </SplitPane>
  </children>
</AnchorPane>

Answer 1

      @FXML TextArea YourTextArea; //i think you already know about this

@Override
public void initialize(URL url, ResourceBundle rb) {
    try {
        Scanner s = new Scanner(new File("EECS.txt")).useDelimiter("\\s+");
        while (s.hasNext()) {
            if (s.hasNextInt()) { // check if next token is an int
                YourTextArea.appendText(s.nextInt() + " "); // display the found integer
            } else {
               YourTextArea.appendText(s.next() + " "); // else read the next token
            }
        }
    } catch (FileNotFoundException ex) {
        System.err.println(ex);
    }
}

或者您只需从initialize（）调用按钮的'on action'方法即可。例如

    @FXML public void displayTextOnButtonClick(){ //suppose this method gets fired when you click button

}

@FXML public void initialize(URL url, ResourceBundle rb) {
   displayTextOnButtonClick();
}

Answer 2

只需将您在displayTextOnButtonClick内写的代码放在initialize()内。这就是初始化的意思。

在处理根节点后调用Initialize，它会向fxml中的控件添加额外的功能（如果已定义）和数据。

JavaFX从文本文件中读取并显示在textarea中

2 个答案: