Question

我试图使用javafx制作GUI程序。该程序应该从csv文件中获取数据，将其存储在公共列表中，并从控制器类中将其显示在GUI中的javafx TableView中。

这是控制器代码

package controllers;

import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;


import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.stage.Stage;
import application.Main;
import application.TablaEst;

public class ControllerVer1 implements Initializable {

    public Stage stage = new Stage();

    private ObservableList<TablaEst> data = FXCollections.observableArrayList();

    @FXML
    private Button volverButton;

    @FXML
    private TableView<TablaEst> tableData;

    //se crean columnas
    @FXML
    private TableColumn<TablaEst, String> nameCol;
    @FXML
    private TableColumn<TablaEst, String> matCol;
    @FXML
    private TableColumn<TablaEst, String> carCol;
    @FXML
    private TableColumn<TablaEst, String> ingCol;
    @FXML
    private TableColumn<TablaEst, String> promCol;
    @FXML
    private TableColumn<TablaEst, String> estCol;

    @Override
    public void initialize(URL location, ResourceBundle resources) {

        nameCol.setCellValueFactory(new PropertyValueFactory<TablaEst,String>("Nombre"));
        matCol.setCellValueFactory(new PropertyValueFactory<TablaEst,String>("Matrícula"));
        carCol.setCellValueFactory(new PropertyValueFactory<TablaEst,String>("Carrera"));
        ingCol.setCellValueFactory(new PropertyValueFactory<TablaEst,String>("Ingreso"));
        promCol.setCellValueFactory(new PropertyValueFactory<TablaEst,String>("Promedio"));
        estCol.setCellValueFactory(new PropertyValueFactory<TablaEst,String>("Estatus"));
        tableData.setEditable(true);
        for (int i=0; i < (Main.estudiantes).size(); i++){
            data.add(new TablaEst(
                    (Main.estudiantes).get(i)[0],
                    (Main.estudiantes).get(i)[1],
                    (Main.estudiantes).get(i)[2],
                    (Main.estudiantes).get(i)[3],
                    (Main.estudiantes).get(i)[4],
                    (Main.estudiantes).get(i)[5]));
            //for (int j=0; j<(Main.estudiantes.get(i)).length; j++){
            //}
            System.out.println(data.get(i));
        }
        tableData.setItems(data);
    }

    @FXML
    public void volverAMain(ActionEvent e) throws IOException{
        stage = (Stage)volverButton.getScene().getWindow();
        Parent root = FXMLLoader.load(getClass().getResource("/application/MainGUI.fxml"));
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.show();
    }

}

这是我的构造函数类

package application;

import javafx.beans.property.SimpleStringProperty;

public class TablaEst {
    private final SimpleStringProperty name;
    private final SimpleStringProperty mat;
    private final SimpleStringProperty car;
    private final SimpleStringProperty ing;
    private final SimpleStringProperty prom;
    private final SimpleStringProperty est;

    public TablaEst (String sName, String sMat, String sCar, String sIng, String sProm, String sEst) {
        this.name = new SimpleStringProperty(sName);
        this.mat = new SimpleStringProperty(sMat);
        this.car = new SimpleStringProperty(sCar);
        this.ing = new SimpleStringProperty(sIng);
        this.prom = new SimpleStringProperty(sProm);
        this.est = new SimpleStringProperty(sEst);
    }

    //Getter methods
    public String getName(){
        return name.get();
    }
    public String getMat(){
        return mat.get();
    }
    public String getCar(){
        return car.get();
    }
    public String getIng(){
        return ing.get();
    }
    public String getProm(){
        return prom.get();
    }
    public String getEst(){
        return est.get();
    }

    //setter methods
    public void setName(String nName){
        name.set(nName);
    }
    public void setMat(String nMat){
        mat.set(nMat);
    }
    public void setCar(String nCar){
        car.set(nCar);
    }
    public void setIng(String nIng){
        ing.set(nIng);
    }
    public void setProm(String nProm){
        prom.set(nProm);
    }
    public void setEst(String nEst){
        est.set(nEst);
    }

}

我已经验证了我的主要类中的estudiantes列表是从csv读取信息，但是该表在GUI上仍然显示为空白。任何反馈和帮助表示赞赏。

Answer 1

该行
```
nameCol.setCellValueFactory(new PropertyValueFactory<TablaEst,String>("Nombre"));
```
表示nameCol表列应该绑定TablaEst.NombreProperty()，或者如果它不存在，则将TablaEst.getNombre()实例的TablaEst字段呈现为单元格值。由于没有这样的方法，该列将为空。

您正在使用TablaEst类中的SimpleStringProperty。除了普通的getter / setter之外，你还应该添加JavaFX特定的getter，如：

private final SimpleStringProperty name;
...
public String getName(){
    return name.get();
}

public void setName(String nName){
    name.set(nName);
}

public StringProperty nameProperty(){
    return name;
}

适用于所有领域。如果tableview是可编辑的，那么这个新的getter将为底层的TablaEst实例提供即时更新现在你可以定义

nameCol.setCellValueFactory(new PropertyValueFactory<TablaEst,String>("name"));

表列的标题名称应通过设置text属性：

来给出

nameCol.setText("The Nombre");

或在FXML中

<TableColumn text="The Nombre" .... >

数据未出现在javafx表视图中

1 个答案: