互联网设计class1

第一节课的要求:使用javafx设计一个界面,能够使用enter以及组合键shift+enter发送消息,能够保存发送的消息,能够导入txt文件的内容;

代码如下:

1.SimpleFx.java

  1 package chapter01;
  2 
  3 import javafx.application.Application;
  4 import javafx.event.EventHandler;
  5 import javafx.geometry.Insets;
  6 import javafx.geometry.Pos;
  7 import javafx.scene.Scene;
  8 import javafx.scene.control.Button;
  9 import javafx.scene.control.Label;
 10 import javafx.scene.control.TextArea;
 11 import javafx.scene.control.TextField;
 12 import javafx.scene.input.KeyCode;
 13 import javafx.scene.input.KeyEvent;
 14 import javafx.scene.layout.BorderPane;
 15 import javafx.scene.layout.HBox;
 16 import javafx.scene.layout.Priority;
 17 import javafx.scene.layout.VBox;
 18 import javafx.stage.Stage;
 19 import chapter01.TextFileIO;
 20 
 21 import java.time.LocalTime;
 22 
 23 public class SimpleFx extends Application {
 24   private Button b1 = new Button("退出");
 25   private Button b2 = new Button("发送");
 26   private Button b3 = new Button("加载");
 27   private Button b4 = new Button("保存");
 28 
 29   private TextField tf1 = new TextField();//信息输入
 30   private TextArea ta1 = new TextArea();//显示输入的信息
 31 
 32   public static void main(String[] args) {
 33     launch(args);
 34   }
 35 
 36   @Override
 37   public void start(Stage primaryStage) {
 38     BorderPane bdp1 = new BorderPane();
 39     VBox vb1 = new VBox();
 40     vb1.setSpacing(5);
 41     vb1.setPadding(new Insets(10,20,10,20));
 42     vb1.getChildren().addAll(new Label("信息显示区:"),
 43     ta1, new Label("信息输入区:"),tf1);
 44     VBox.setVgrow(ta1, Priority.ALWAYS);
 45     bdp1.setCenter(vb1);
 46     ta1.setEditable(false);
 47 
 48     HBox hb1 = new HBox();
 49     hb1.setSpacing(10);
 50     hb1.setPadding(new Insets(10,20,10,20));
 51     hb1.setAlignment(Pos.CENTER);
 52     hb1.getChildren().addAll(b1,b2,b3,b4);
 53 
 54     bdp1.setBottom(hb1);
 55     Scene sc1 = new Scene(bdp1,700,400);
 56     primaryStage.setScene(sc1);
 57     primaryStage.show();
 58 
 59     //setonaction
 60     b1.setOnAction(e->System.exit(0));//退出
 61     b2.setOnAction(e->{//保存
 62     String msg = tf1.getText();
 63     ta1.appendText(msg + "\n");
 64     tf1.clear();
 65   });
 66   //回车响应
 67   tf1.setOnKeyPressed(new EventHandler<KeyEvent>() {
 68     @Override
 69     public void handle(KeyEvent event) {
 70       //shift+enter
 71       if (event.getCode() == KeyCode.ENTER && event.isShiftDown() && !tf1.getText().isEmpty()){
 72         String msg = tf1.getText();
 73         ta1.appendText("echo: "+msg + "\n");
 74         tf1.clear();
 75       }
 76       //回车且非空
 77       else if (event.getCode() == KeyCode.ENTER && !tf1.getText().isEmpty()){
 78         String msg = tf1.getText();
 79         ta1.appendText(msg + "\n");
 80         tf1.clear();
 81       }
 82     }
 83   });
 84 
 85   //文件读写
 86   TextFileIO textFileIO = new TextFileIO();
 87 
 88   b3.setOnAction(e->{//加载
 89     String msg = textFileIO.load();
 90     // System.out.println("msg: "+msg);
 91     if (msg != null){
 92       ta1.clear();
 93       ta1.setText(msg);
 94     }
 95   });
 96 
 97   b4.setOnAction(e->{//
 98     textFileIO.append(
 99       LocalTime.now().withNano(0)+" "+ta1.getText()
100     );101   }
102 }

2.TextFileIO.java

 1 package chapter01;
 2 
 3 import javafx.stage.FileChooser;
 4 
 5 import java.io.File;
 6 import java.io.FileOutputStream;
 7 import java.io.OutputStreamWriter;
 8 import java.io.PrintWriter;
 9 import java.util.Scanner;
10 
11 public class TextFileIO {
12 private PrintWriter pw;
13 private Scanner sc;
14 
15 //构造函数
16 public TextFileIO(){
17 };
18 
19 //
20 public void append(String msg){
21   FileChooser fc1 = new FileChooser();
22   File f1 = fc1.showSaveDialog(null);
23   if (f1 == null)
24     return;
25   try{
26     pw = new PrintWriter(
27       new OutputStreamWriter(
28       new FileOutputStream(f1,true),"utf-8"
29     ));
30     pw.println(msg);
31     } catch (Exception e){
32       e.printStackTrace();
33     } finally {
34       pw.close();
35     }
36 }
37 
38 //
39 public String load(){
40   FileChooser fc2 = new FileChooser();
41   File f2 = fc2.showOpenDialog(null);
42   if (f2 == null)
43     return null;
44   StringBuilder sb = new StringBuilder();
45   try {
46     sc = new Scanner(f2,"utf-8");
47     while (sc.hasNext()){
48       sb.append(sc.nextLine()+"\n");
49     }
50   } catch (Exception e){
51     e.printStackTrace();
52   } finally {
53     sc.close();
54   }
55   return sb.toString();
56 }
posted @ 2021-09-09 14:46  peach1  阅读(37)  评论(0编辑  收藏  举报