如何在java fxml中向TableView添加动态列和行

Question

在java fxml中我正在从.csv文件中检索数据。我正在向表视图添加动态列和行，并且列正在添加但不添加行。 我正在尝试和搜索互联网，但我无法得到任何合适的结果。

我的代码： -

public class FXMLDocumentController {

    @FXML
    private TableView tableView;
    String headers[] = null;
    String items[] = null;

    Employee ee;

    @FXML
    private void initialize() {
        Insert();
    }

    public void Insert() {
        List<String> columns = new ArrayList<String>();
        List<String> rows = new ArrayList<String>();
        ObservableList<ObservableList> csvData = FXCollections.observableArrayList();

        try {
            int columnIndex = 0;
            TableColumn[] tableColumns;
            File f = new File("C:\\Users\\admin\\Desktop\\Project\\shipforecast\\Data\\Recieve\\ShipId-1432530905282-1.csv");
            if (f.exists() && !f.isDirectory()) {
                FileReader fin = new FileReader(f);
                BufferedReader in = new BufferedReader(fin);
                String l;
                int i = 0;

                while ((l = in.readLine()) != null) {

                    if (i < 1) {
                        headers = l.split(",");

                        for (String w : headers) {
                            columns.add(w);

                        }

                        tableColumns = new TableColumn[columns.size()];
                        columnIndex = 0;
                        for (String columName : columns) {

                            //System.out.println("dynamic.FXMLDocumentController.Insert()"+columns.size());
                            tableColumns[columnIndex++] = new TableColumn(columName);
                        }

                        tableView.getColumns().addAll(tableColumns);
                    } else {
                        ObservableList<String> row = FXCollections.observableArrayList();
                        items = l.split(",");
                        for (String item:items) {

                            row.add(item);
                        }
                        csvData.add(row);
                        System.out.println("hi");

                    }
                    i++;
                    tableView.getItems().add(csvData);
                }
            } else {
                System.out.println("File Not Found");
            }
        } catch (Exception e) {
            System.out.println(e);
        }

    }
}

Answer 1

您缺少的是列的cellValueFactory，它会告诉列在其单元格中显示的值。

这样的事情：

TableView<ObservableList<String>> tableView = new TableView<>();
List<String> columnNames = dataGenerator.getNext(N_COLS);
for (int i = 0; i < columnNames.size(); i++) {
    final int finalIdx = i;
    TableColumn<ObservableList<String>, String> column = new TableColumn<>(
            columnNames.get(i)
    );
    column.setCellValueFactory(param ->
            new ReadOnlyObjectWrapper<>(param.getValue().get(finalIdx))
    );
    tableView.getColumns().add(column);
}

示例应用

此解决方案略微基于Narayan的博文：Updated: Dynamic TableView Data From Database。该解决方案使用测试数据生成器生成一些虚拟数据和一些Java 8 lambda特性，而不是那篇博客文章，这些特性使得单元值工厂定义的编写和查看不那么笨拙。

import javafx.application.Application;
import javafx.beans.property.ReadOnlyObjectWrapper;
import javafx.collections.*;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.stage.Stage;

import java.util.*;

public class DynamicTableView extends Application {    
    private static final int N_COLS = 5;
    private static final int N_ROWS = 1_000;

    public void start(Stage stage) throws Exception {
        TestDataGenerator dataGenerator = new TestDataGenerator();

        TableView<ObservableList<String>> tableView = new TableView<>();

        // add columns
        List<String> columnNames = dataGenerator.getNext(N_COLS);
        for (int i = 0; i < columnNames.size(); i++) {
            final int finalIdx = i;
            TableColumn<ObservableList<String>, String> column = new TableColumn<>(
                    columnNames.get(i)
            );
            column.setCellValueFactory(param ->
                    new ReadOnlyObjectWrapper<>(param.getValue().get(finalIdx))
            );
            tableView.getColumns().add(column);
        }

        // add data
        for (int i = 0; i < N_ROWS; i++) {
            tableView.getItems().add(
                    FXCollections.observableArrayList(
                            dataGenerator.getNext(N_COLS)
                    )
            );
        }

        tableView.setPrefHeight(200);

        Scene scene = new Scene(tableView);
        stage.setScene(scene);
        stage.show();
    }

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

    private static class TestDataGenerator {
        private static final String[] LOREM = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc tempus cursus diam ac blandit. Ut ultrices lacus et mattis laoreet. Morbi vehicula tincidunt eros lobortis varius. Nam quis tortor commodo, vehicula ante vitae, sagittis enim. Vivamus mollis placerat leo non pellentesque. Nam blandit, odio quis facilisis posuere, mauris elit tincidunt ante, ut eleifend augue neque dictum diam. Curabitur sed lacus eget dolor laoreet cursus ut cursus elit. Phasellus quis interdum lorem, eget efficitur enim. Curabitur commodo, est ut scelerisque aliquet, urna velit tincidunt massa, tristique varius mi neque et velit. In condimentum quis nisi et ultricies. Nunc posuere felis a velit dictum suscipit ac non nisl. Pellentesque eleifend, purus vel consequat facilisis, sapien lacus rutrum eros, quis finibus lacus magna eget est. Nullam eros nisl, sodales et luctus at, lobortis at sem.".split(" ");

        private int curWord = 0;

        List<String> getNext(int nWords) {
            List<String> words = new ArrayList<>();

            for (int i = 0; i < nWords; i++) {
                if (curWord == Integer.MAX_VALUE) {
                    curWord = 0;
                }

                words.add(LOREM[curWord % LOREM.length]);
                curWord++;
            }

            return words;
        }
    }
}