java - 自制端口扫描仪无法与 JavaFX 一起使用

Question

所以我用 Java 创建了一个端口扫描器。

使用 Swing 时，一切顺利，错误为零。

但是，我尝试将我的应用程序转换为 JavaFX 风格的 GUI，但当我按下按钮时没有任何效果(即使我已在 GUI 构建器中设置了方法 ID)。

我的问题是什么？

我的代码:

package networkTools.gui;

import java.net.Socket;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;

public class PortScannerController implements Initializable {
    @FXML
    TextField hostName;
    @FXML
    TextField fromPort;
    @FXML
    TextArea log;
    @FXML
    Button scan;
    @FXML
    Button reset;
    @FXML
    Label label;


    @Override
    public void initialize(URL url, ResourceBundle rb) {
        hostName.requestFocus();
    }

    public void initFocus() {
        hostName.requestFocus();
    }

    @FXML
    private void onScan() {
        int fp;
        String h;
        Socket s;
        if (hostName.getText().equals("")) {
            log.setText("Fill everything correct.");
            return;
        } else if (fromPort.getText().equals("")) {
            log.setText("Fill everything correct..");
            return;
        } else if (!fromPort.getText().matches("[0-9]*")) {
            log.setText("Give a number for a port ");
            return;
        }
        // scan.disable(false);
        reset.setText("Stop");
        log.setText("");
        log.clear();
        label.setText("");
        h = hostName.getText();
        fp = Integer.parseInt(fromPort.getText());

        label.setText("Port " + fp + " being tested (max +- 15 sec.)");

        try {
            s = new Socket(h, fp);
            log.appendText("Poort " + fp + " is open.\n");
            log.clear();
            s.close();
        } catch (Exception er) {
            log.appendText("Poort " + fp + " is closed");
        }

        // scan.setEnabled(true);
        reset.setText("Reset");
        label.setText("Press scan to start.");

    }

}

FXML:

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

<?import java.lang.*?>
<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.text.*?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextArea?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.control.ToggleButton?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.layout.StackPane?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Font?>

<VBox id="pane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="400.0" stylesheets="@style.css" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="networkTools.gui.PortScannerController">
   <children>
      <StackPane prefHeight="80.0" prefWidth="600.0">
         <children>
            <Label id="title" alignment="CENTER" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" prefHeight="50.0" prefWidth="400.0" text="Port Scanner" StackPane.alignment="CENTER">
               <font>
                  <Font name="Arial Black" size="18.0" />
               </font>
            </Label>
         </children>
      </StackPane>
      <GridPane>
        <columnConstraints>
          <ColumnConstraints hgrow="SOMETIMES" maxWidth="295.0" minWidth="10.0" prefWidth="131.0" />
          <ColumnConstraints hgrow="SOMETIMES" maxWidth="407.0" minWidth="10.0" prefWidth="269.0" />
        </columnConstraints>
        <rowConstraints>
          <RowConstraints maxHeight="50.0" minHeight="50.0" prefHeight="50.0" vgrow="SOMETIMES" />
            <RowConstraints maxHeight="50.0" minHeight="50.0" prefHeight="50.0" vgrow="SOMETIMES" />
            <RowConstraints maxHeight="50.0" minHeight="50.0" prefHeight="50.0" vgrow="SOMETIMES" />
        </rowConstraints>
         <children>
            <Label alignment="CENTER" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="25.0" prefWidth="100.0" text="Host Name">
               <font>
                  <Font name="Arial Black" size="12.0" />
               </font>
               <GridPane.margin>
                  <Insets left="10.0" />
               </GridPane.margin>
            </Label>
            <Label alignment="CENTER" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="25.0" prefWidth="100.0" text="Port" GridPane.rowIndex="1">
               <font>
                  <Font name="Arial Black" size="12.0" />
               </font>
               <GridPane.margin>
                  <Insets left="10.0" />
               </GridPane.margin>
            </Label>
            <TextField fx:id="fromPort" GridPane.columnIndex="1" GridPane.rowIndex="1">
               <GridPane.margin>
                  <Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
               </GridPane.margin>
               <font>
                  <Font name="Arial Black" size="12.0" />
               </font>
            </TextField>
            <ToggleButton id="commandbutton" fx:id="onScan" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="25.0" prefWidth="100.0" text="Scan" GridPane.halignment="CENTER" GridPane.rowIndex="2" GridPane.valignment="CENTER">
               <font>
                  <Font name="Arial Black" size="12.0" />
               </font>
            </ToggleButton>
            <ToggleButton id="commandbutton" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="25.0" prefWidth="100.0" text="Reset" GridPane.columnIndex="1" GridPane.halignment="CENTER" GridPane.rowIndex="2" GridPane.valignment="CENTER">
               <font>
                  <Font name="Arial Black" size="12.0" />
               </font>
            </ToggleButton>
            <TextField fx:id="hostName" GridPane.columnIndex="1">
               <GridPane.margin>
                  <Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
               </GridPane.margin>
               <font>
                  <Font name="Arial Black" size="12.0" />
               </font>
            </TextField>
         </children>
      </GridPane>
      <TextArea id="textpane" fx:id="log" editable="false" prefHeight="148.0" prefWidth="600.0">
         <VBox.margin>
            <Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
         </VBox.margin>
      </TextArea>
      <StackPane prefHeight="80.0" prefWidth="380.0" VBox.vgrow="NEVER">
         <VBox.margin>
            <Insets bottom="10.0" left="20.0" />
         </VBox.margin>
         <children>
            <Label alignment="CENTER" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="25.0" prefWidth="200.0" text="Press Scan to start" textFill="#1815c9">
               <font>
                  <Font name="Arial Black" size="13.0" />
               </font>
            </Label>
         </children>
      </StackPane>
   </children>
</VBox>

Answer 1

没有任何地方可以将处理程序与按钮关联起来。您需要在 FXML 中为“扫描”按钮添加 onAction="#onScan":

<ToggleButton id="commandbutton" onAction="#onScan" fx:id="onScan" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="25.0" prefWidth="100.0" text="Scan" GridPane.halignment="CENTER" GridPane.rowIndex="2" GridPane.valignment="CENTER">

您的 FXML 中还有其他一些看起来不正确的内容:

1. 您有多个具有相同 CSS id 的元素(例如 "commandButton")；如果您想在多个组件之间共享样式，则应该使用 styleClass 而不是 id。
2. 您为上面的按钮声明了一个 fx:id="onScan"，但您的 Controller 中没有名为 onScan 的字段。
3. 不太清楚为什么要使用 ToggleButton 而不是常规的 Button 来执行看似操作的操作。 ToggleButton 通常用于在两种不同状态之间切换，而不是发出命令/操作。