Question

我的代码有问题。我想从Excel文件中读取。我有两个组合框。在第一个组合框中，选择一个国家。在第二个ComboBox中，仅应显示该国家/地区中可用的市场。我用If来做到这一点。但是，如果我更改国家/地区，则将再次读取Excel。我希望在程序启动时可以一次读取Excel。

我该怎么做？我的想法是将代码放在Main中，但我不知道那是否可能。

控制器：

public class Controller implements Initializable {

@FXML
public ComboBox<Country> cbl;

@FXML
public ComboBox<Markt> cbm;


public static final String SAMPLE_XLSX_FILE_PATH = "C:\\Users\\msch05051\\Desktop\\Sonstiges\\VitracomShopFinder\\2018-07-19_Installationsplan_Kaufland.xlsx";

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

}


public void setData() throws IOException {
    cbl.setItems(FXCollections.observableArrayList(
            new Country("Rumänien", "RO"),
            new Country("Bulgarien", "BG"),
            new Country("Tschechien", "CZ"),
            new Country("Slowakei", "SK"),
            new Country("Polen", "PL"),
            new Country("Kroatien", "HR")));
}


public void read() throws IOException {
    // Creating a Workbook from an Excel file (.xls or .xlsx)
    Workbook workbook = WorkbookFactory.create(new File(SAMPLE_XLSX_FILE_PATH));

    // Retrieving the number of sheets in the Workbook
    System.out.println("Workbook has " + workbook.getNumberOfSheets() + " Sheets : ");

    // Getting the Sheet at index zero
    Sheet sheet = workbook.getSheetAt(0);

    // Create a DataFormatter to format and get each cell's value as String
    DataFormatter dataFormatter = new DataFormatter();

    // 3. Or you can use Java 8 forEach loop with lambda
    ArrayList<Markt> markt = new ArrayList<>();
    String a = cbl.getSelectionModel().getSelectedItem().getKürzel();
    for (Row row : sheet) {
        if ((dataFormatter.formatCellValue(row.getCell(49)).equals("produktiv") || dataFormatter.formatCellValue(row.getCell(49)).equals("Produktiv")) & a.equals(dataFormatter.formatCellValue(row.getCell(8)))) {
            //markt.add(dataFormatter.formatCellValue(row.getCell(49)));

            markt.add(new Markt(dataFormatter.formatCellValue(row.getCell(9)), dataFormatter.formatCellValue(row.getCell(49)), dataFormatter.formatCellValue(row.getCell(8)), dataFormatter.formatCellValue(row.getCell(0))));

        }
    }
    cbm.setItems(FXCollections.observableArrayList(
            markt
    ));

    //read array
    for (int i = 0;i<markt.size();i++){
        System.out.println(markt.get(i));
    }
}

主要：

public class Main extends Application {

@Override
public void start(Stage primaryStage) throws Exception{
    FXMLLoader loader = new FXMLLoader(getClass().getResource("sample.fxml"));
    Parent root = loader.load();
    Controller controller = loader.getController();

    primaryStage.setTitle("Hello World");
    primaryStage.setScene(new Scene(root, 300, 275));
    primaryStage.show();


    //Set Data to FXML through controller
    controller.setData();


    controller.cbl.setConverter(new StringConverter<Country>() {
        @Override
        public String toString(Country object) {
            return object.getLand();
        }

        @Override
        public Country fromString(String string) {
            return null;
        }
    });

    controller.cbm.setConverter(new StringConverter<Markt>() {
        @Override
        public String toString(Markt object) {
            return object.getMarkt();
        }

        @Override
        public Markt fromString(String string) {
            return null;
        }
    });
}


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

通过Controller访问Main以在Excel上读取

0 个答案: