打印到JavaFX窗口

Question

如何从.txt文件读取多行文本，选择包含某个字符串的文本，最后将它们作为只读文本添加到JavaFX窗口？

我知道如何选择包含特定字符串的行，但我不知道怎么回的文本或如何文本的变量量添加到标签

我所需要的最终产品的多条线路显示是这样的：

String1a, String2a,...\n 
String1b, String2b,...\n 
-or- 
String1a 
String2a 
\n 
String1b 
String2b 
. 
. 
. 

它目前显示像第二个选项，但它是所有“空” 这里是我的代码的一部分：

 bt4.setOnAction(
       new EventHandler<ActionEvent>() { 
        @Override public void handle(ActionEvent e) { 
        VBox vb3 = new VBox(); 
        if(dent == true) { 

         a = dentist.selectAppt(id.getText()); 
         for(int i=0; i< 4;i++) { 
          System.out.println(a[i]); 
         } 
         Label app = new Label(WORDS); 
         app.setWrapText(true); 
         vb3.getChildren().add(app); 
        } 

        if(dent == false) { 
        //TODO 
        } 
        Stage stage = new Stage(); 

        vb3.setSpacing(10); 

        BorderPane p = new BorderPane(); 
        Pane p1= new Pane(); 
        p1.getChildren().add(vb3); 
        p.getChildren().add(p1); 

        Scene scene2 = new Scene(p,500,500); 
        stage.setScene(scene2); 
        stage.show(); 
        } 
       }); 
    } 

    private final String WORDS = 
     a[0]+"\n" + 
     a[1]+"\n" + 
     a[2]+"\n" + 
     a[3]+"\n"; 



    public static void main(String[] args) { 
     launch(args); 
    } 


} 

这是从.txt文件选择字符串数组的方法，包括：

public String[] selectAppt(String s) { 

     String[] sa = new String[4]; 

     try { 
      Scanner scan = new Scanner(file2); 
      while(scan.hasNextLine()) { 
      String line = scan.nextLine(); 
      if(line.contains(s)) { 
       //System.out.println(line); 
       StringTokenizer st = new StringTokenizer(line,":"); 
       pid = st.nextToken(); 
       appt = st.nextToken(); 
       did = st.nextToken(); 
       pcode = st.nextToken(); 
       sa[0] = pid; 
       sa[1] = appt; 
       sa[2] = did; 
       sa[3] = pcode; 

       //System.out.println("\tPatient ID:\t"+pid); 
       //System.out.println("\tTime and Date:\t"+appt); 
       //System.out.println("\tDentist ID:\t"+did); 
       //System.out.println("\tProcedure:\t"+pcode); 
       //System.out.println(); 
      } 

     }} 
     catch (FileNotFoundException e) { 
     System.out.println("error"); 
     } 
    return sa; 


    } 

它目前是这样的，它只是返回1行文本的随后结束。我需要改变这一点，但我不知道如何。

Answer 1

FileFilter.java

import javafx.application.Application; 
import javafx.scene.Scene; 
import javafx.scene.control.TextArea; 
import javafx.stage.Stage; 

import java.io.IOException; 
import java.nio.file.*; 
import java.util.stream.Collectors; 

public class FileFilter extends Application { 
    public static final String SOURCE_FILE = "/tmp/christmas-eve.txt"; 
    public static final String SEARCH_STRING = "be"; 

    @Override 
    public void start(Stage stage) throws IOException { 
     String filteredText = 
      Files.lines(Paths.get(SOURCE_FILE)) 
       .filter(line -> line.contains(SEARCH_STRING)) 
       .collect(Collectors.joining("\n")); 

     TextArea textArea = new TextArea(filteredText); 
     textArea.setEditable(false); 

     stage.setScene(new Scene(textArea)); 
     stage.show(); 
    } 

    public static void main(String[] args) { 
     launch(args); 
    } 
} 

/tmp/christmas-eve.txt

 
'Twas the night before Christmas, when all through the house 
Not a creature was stirring, not even a mouse; 
The stockings were hung by the chimney with care 
In hopes that St. Nicholas soon would be there; 

The children were nestled all snug in their beds, 
While visions of sugar-plums danced in their heads; 
And mamma in her kerchief, and I in my cap, 
Had just settled our brains for a long winter's nap, 

When out on the lawn there arose such a clatter, 
I sprang from the bed to see what was the matter. 
Away to the window I flew like a flash, 
Tore open the shutters and threw up the sash. 

The moon on the breast of the new-fallen snow 
Gave the lustre of mid-day to objects below, 
When, what to my wondering eyes should appear, 
But a miniature sleigh, and eight tiny reindeer, 

With a little old driver, so lively and quick, 
I knew in a moment it must be St. Nick. 
More rapid than eagles his coursers they came, 
And he whistled, and shouted, and called them by name: 

"Now, _Dasher!_ now, _Dancer!_ now, _Prancer_ and _Vixen!_ 
On, _Comet!_ on, _Cupid!_ on, _Donder_ and _Blitzen!_ 
To the top of the porch! to the top of the wall! 
Now dash away! dash away! dash away all!"