Sorting JavaFX按日期排序TableView列（dd/mm/yyyy格式）

我有一个包含许多列的TableView。第一个包含日期（格式为

dd/mm/yyyy

格式），但日期排序不“正确”

下面是我一直在准备的一个小例子：

代码如下：

Test.java

package test;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;

public class Test extends Application {
    private AnchorPane rootLayout;

    @Override
    public void start(Stage primaryStage) throws Exception{

        FXMLLoader loader = new FXMLLoader();
        loader.setLocation(Test.class.getResource("FXMLDocument.fxml"));
        FXMLDocumentController controller = new FXMLDocumentController();
        loader.setController(controller);

        rootLayout = (AnchorPane) loader.load();
        Scene scene = new Scene(rootLayout);

        primaryStage.setScene(scene);
        primaryStage.setTitle("Test");

        primaryStage.centerOnScreen();
        primaryStage.show();

    }

}

package test;

import java.util.List;
import java.util.Map;
import javafx.fxml.FXML;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;

public class FXMLDocumentController {
    private ObservableList<ExampleTable> datos;
    @FXML public TableView<ExampleTable> tv_example;
    @FXML public TableColumn<ExampleTable, String> col_date, col_name;

    public void initialize(){
        datos = FXCollections.observableArrayList();
        col_date.setCellValueFactory(new PropertyValueFactory<>("date"));
        col_name.setCellValueFactory(new PropertyValueFactory<>("name"));

        setTable();
    }

    public void setTable(){
        List<Map<String, String>> lmap = ExampleTable.lmap();
        for(Map<String, String> element : lmap){
            ExampleTable objEt = new ExampleTable(element.get("date"), element.get("name"));
            datos.add(objEt);
        }

        tv_example.setItems(datos);
        tv_example.getSortOrder().setAll(col_date);
    }
}

package test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

public class ExampleTable {
    public StringProperty date;
    public StringProperty name;

    public ExampleTable(String date, String name){
        this.date = new SimpleStringProperty(date);
        this.name = new SimpleStringProperty(name);
    }

    public String getDate(){
        return date.get();
    }

    public void setDate(String date){
        this.date.set(date);
    }

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

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

    public static List<Map<String, String>> lmap(){
        List<Map<String, String>> list = new ArrayList<>();

        Map<String, String> row = new HashMap<>();
        row.put("date", "14/01/1988");
        row.put("name", "Hagen");
        list.add(row);

        row = new HashMap<>();
        row.put("date", "27/02/1988");
        row.put("name", "Herrman");
        list.add(row);

        row = new HashMap<>();
        row.put("date", "16/03/1988");
        row.put("name", "Hank");
        list.add(row);

        row = new HashMap<>();
        row.put("date", "19/05/1994");
        row.put("name", "Jack");
        list.add(row);

        return list;
    }
}

public ObjectProperty<LocalDate> date;
    public StringProperty name;

    public ExampleTable(LocalDate date, String name){
        this.date = new SimpleObjectProperty(date);
        this.name = new SimpleStringProperty(name);
    }

    public LocalDate getDate(){
        return date.get();
    }

    public void setDate(LocalDate date){
        this.date.set(date);
    }

public class FXMLDocumentController {
    private ObservableList<ExampleTable> datos;
    @FXML public TableView<ExampleTable> tv_example;
    @FXML public TableColumn<ExampleTable, LocalDate> col_date;
    @FXML public TableColumn<ExampleTable, String> col_name;

    public void initialize(){
        datos = FXCollections.observableArrayList();
        col_date.setCellValueFactory(new PropertyValueFactory<>("date"));
        col_name.setCellValueFactory(new PropertyValueFactory<>("name"));

        setTable();
    }

    public void setTable(){
        List<Map<String, String>> lmap = ExampleTable.lmap();

        for(Map<String, String> element : lmap){
            LocalDate dt = ExampleTable.toLocalDate(element.get("date"));
            ExampleTable objEt = new ExampleTable(dt, element.get("name"));
            datos.add(objEt);
        }

        tv_example.setItems(datos);
        tv_example.getSortOrder().setAll(col_date);
    }
}

FXMLDocumentController.java

package test;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;

public class Test extends Application {
    private AnchorPane rootLayout;

    @Override
    public void start(Stage primaryStage) throws Exception{

        FXMLLoader loader = new FXMLLoader();
        loader.setLocation(Test.class.getResource("FXMLDocument.fxml"));
        FXMLDocumentController controller = new FXMLDocumentController();
        loader.setController(controller);

        rootLayout = (AnchorPane) loader.load();
        Scene scene = new Scene(rootLayout);

        primaryStage.setScene(scene);
        primaryStage.setTitle("Test");

        primaryStage.centerOnScreen();
        primaryStage.show();

    }

}

package test;

import java.util.List;
import java.util.Map;
import javafx.fxml.FXML;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;

public class FXMLDocumentController {
    private ObservableList<ExampleTable> datos;
    @FXML public TableView<ExampleTable> tv_example;
    @FXML public TableColumn<ExampleTable, String> col_date, col_name;

    public void initialize(){
        datos = FXCollections.observableArrayList();
        col_date.setCellValueFactory(new PropertyValueFactory<>("date"));
        col_name.setCellValueFactory(new PropertyValueFactory<>("name"));

        setTable();
    }

    public void setTable(){
        List<Map<String, String>> lmap = ExampleTable.lmap();
        for(Map<String, String> element : lmap){
            ExampleTable objEt = new ExampleTable(element.get("date"), element.get("name"));
            datos.add(objEt);
        }

        tv_example.setItems(datos);
        tv_example.getSortOrder().setAll(col_date);
    }
}

package test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

public class ExampleTable {
    public StringProperty date;
    public StringProperty name;

    public ExampleTable(String date, String name){
        this.date = new SimpleStringProperty(date);
        this.name = new SimpleStringProperty(name);
    }

    public String getDate(){
        return date.get();
    }

    public void setDate(String date){
        this.date.set(date);
    }

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

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

    public static List<Map<String, String>> lmap(){
        List<Map<String, String>> list = new ArrayList<>();

        Map<String, String> row = new HashMap<>();
        row.put("date", "14/01/1988");
        row.put("name", "Hagen");
        list.add(row);

        row = new HashMap<>();
        row.put("date", "27/02/1988");
        row.put("name", "Herrman");
        list.add(row);

        row = new HashMap<>();
        row.put("date", "16/03/1988");
        row.put("name", "Hank");
        list.add(row);

        row = new HashMap<>();
        row.put("date", "19/05/1994");
        row.put("name", "Jack");
        list.add(row);

        return list;
    }
}

public ObjectProperty<LocalDate> date;
    public StringProperty name;

    public ExampleTable(LocalDate date, String name){
        this.date = new SimpleObjectProperty(date);
        this.name = new SimpleStringProperty(name);
    }

    public LocalDate getDate(){
        return date.get();
    }

    public void setDate(LocalDate date){
        this.date.set(date);
    }

public class FXMLDocumentController {
    private ObservableList<ExampleTable> datos;
    @FXML public TableView<ExampleTable> tv_example;
    @FXML public TableColumn<ExampleTable, LocalDate> col_date;
    @FXML public TableColumn<ExampleTable, String> col_name;

    public void initialize(){
        datos = FXCollections.observableArrayList();
        col_date.setCellValueFactory(new PropertyValueFactory<>("date"));
        col_name.setCellValueFactory(new PropertyValueFactory<>("name"));

        setTable();
    }

    public void setTable(){
        List<Map<String, String>> lmap = ExampleTable.lmap();

        for(Map<String, String> element : lmap){
            LocalDate dt = ExampleTable.toLocalDate(element.get("date"));
            ExampleTable objEt = new ExampleTable(dt, element.get("name"));
            datos.add(objEt);
        }

        tv_example.setItems(datos);
        tv_example.getSortOrder().setAll(col_date);
    }
}

我明白了：

---

您可以使用

cellFactory

更改

LocalDate

在表格单元格中的显示方式（除了您已有的

cellValueFactory

之外）：

DateTimeFormatter formatter=DateTimeFormatter.of模式（“dd/MM/yyyy”）；
col_date.setCellFactory（tc->new TableCell（））{
@凌驾
受保护的void updateItem（LocalDate，布尔值为空）{
super.updateItem（日期，空）；
if（空）{
setText（空）；
}否则{
setText（formatter.format（date））；
}
}
});

将列

LocalDate

的数据类型改为

String

（即使用

TableColumn colDate

，并将

ExampleTable

中的

date

的类型更改为

ObjectProperty

），如您所建议，我已将其更改为“LocalDate”，但现在日期为yyy-mm-dd格式，如图02所示，请参阅答案。FWIW我会尽可能地将更改从

String

传播到

LocalDate

，也就是说，将

静态方法更改为只返回
列表而不是映射。基本上，您应该始终使用
LocalDate
表示日期，而不是
String
，除非您希望显示日期（这是在实际单元格的实现中）。这样的答案应该有向上投票。我花了两天时间才找到这个漂亮的答案。