问题
TableColumn<Event,Date> releaseTime = new TableColumn<>("Release Time");
releaseTime.setCellValueFactory(
new PropertyValueFactory<Event,Date>("releaseTime")
);
How can I change the format of releaseTime? At the moment it calls a simple toString on the Date object.
回答1:
You can accomplish that through Cell Factories. See
https://stackoverflow.com/a/10149050/682495
https://stackoverflow.com/a/10700642/682495
Although the 2nd link is about ListCell, the same logic is totally applicable to TableCells too.
P.S. Still if you need some sample code, kindly will attach here.
回答2:
If you want to preserve the sorting capabilities of your TableColumn, none of the solutions above is valid: if you convert your Date to a String and show it that way in your TableView; the table will sort it as such (so incorrectly).
The solution I found was subclassing the Date class in order to override the toString() method. There is a caveat here though: the TableView uses java.sql.Date instead of java.util.Date; so you need to subclass the former.
import java.text.SimpleDateFormat;
public class CustomDate extends java.sql.Date {
public CustomDate(long date) {
super(date);
}
@Override
public String toString() {
return new SimpleDateFormat("dd/MM/yyyy").format(this);
}
}
The table will call that method in order to print the date.
Of course, you need to change too your Date class in the TableColumn declaration to the new subclass:
@FXML
TableColumn<MyObject, CustomDate> myDateColumn;
Same thing when you attach your object attribute to the column of your table:
myDateColumn.setCellValueFactory(new PropertyValueFactory< MyObject, CustomDate>("myDateAttr"));
And finally, for the shake of clarity this is how you declare the getter in your object class:
public CustomDate getMyDateAttr() {
return new CustomDate(myDateAttr.getTime()); //myDateAttr is a java.util.Date
}
It took me a while to figure out this due to the fact that it uses java.sql.Date behind the scenes; so hopefully this will save other people some time!
回答3:
I'd recommend using Java generics to create re-usable column formatter that takes any java.text.Format. This cuts down on the amount of boilerplate code...
private class ColumnFormatter<S, T> implements Callback<TableColumn<S, T>, TableCell<S, T>> {
private Format format;
public ColumnFormatter(Format format) {
super();
this.format = format;
}
@Override
public TableCell<S, T> call(TableColumn<S, T> arg0) {
return new TableCell<S, T>() {
@Override
protected void updateItem(T item, boolean empty) {
super.updateItem(item, empty);
if (item == null || empty) {
setGraphic(null);
} else {
setGraphic(new Label(format.format(item)));
}
}
};
}
}
Examples of usage
birthday.setCellFactory(new ColumnFormatter<Person, Date>(new SimpleDateFormat("dd MMM YYYY")));
amplitude.setCellFactory(new ColumnFormatter<Levels, Double>(new DecimalFormat("0.0dB")));
回答4:
I needed to do this recently -
dateAddedColumn.setCellValueFactory(
new Callback<TableColumn.CellDataFeatures<Film, String>, ObservableValue<String>>() {
@Override
public ObservableValue<String> call(TableColumn.CellDataFeatures<Film, String> film) {
SimpleStringProperty property = new SimpleStringProperty();
DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
property.setValue(dateFormat.format(film.getValue().getCreatedDate()));
return property;
}
});
However - it is a lot easier in Java 8 using Lamba Expressions:
dateAddedColumn.setCellValueFactory(
film -> {
SimpleStringProperty property = new SimpleStringProperty();
DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
property.setValue(dateFormat.format(film.getValue().getCreatedDate()));
return property;
});
Hurry up with that Java 8 release oracle!
回答5:
Update for Java FX8:
(I'm not sure it is the good place for that answer, but I get the problem in JavaFX8 and some things have changed, like java.time package)
Some differences with the previous answers: I keep the date type on the column, so I need to use both cellValueFactory and cellFactory. I Make a generic reusable method to generate the cellFactory for all date columns. I use java 8 date for java.time package! But the method could be easily reimplemented for java.util.date.
@FXML
private TableColumn<MyBeanUi, ZonedDateTime> dateColumn;
@FXML
public void initialize () {
// The normal binding to column
dateColumn.setCellValueFactory(cellData -> cellData.getValue().getCreationDate());
//.. All the table initialisation and then
DateTimeFormatter format = DateTimeFormatter .ofLocalizedDate(FormatStyle.SHORT);
dateColumn.setCellFactory (getDateCell(format));
}
public static <ROW,T extends Temporal> Callback<TableColumn<ROW, T>, TableCell<ROW, T>> getDateCell (DateTimeFormatter format) {
return column -> {
return new TableCell<ROW, T> () {
@Override
protected void updateItem (T item, boolean empty) {
super.updateItem (item, empty);
if (item == null || empty) {
setText (null);
}
else {
setText (format.format (item));
}
}
};
};
}
The advantages are that:
- The column is typed with a "java8 Date" to avoid the sort problem evoqued by @Jordan
- The method "getDateCell" is generic and can be used as an util function for all Java8 Time types (Local Zoned etc.)
回答6:
An universal solution could be as simple as that:
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.util.Callback;
public interface AbstractConvertCellFactory<E, T> extends Callback<TableColumn<E, T>, TableCell<E, T>> {
@Override
default TableCell<E, T> call(TableColumn<E, T> param) {
return new TableCell<E, T>() {
@Override
protected void updateItem(T item, boolean empty) {
super.updateItem(item, empty);
if (item == null || empty) {
setText(null);
} else {
setText(convert(item));
}
}
};
}
String convert(T value);
}
And its sample usage:
TableColumn<Person, Timestamp> dateCol = new TableColumn<>("employment date");
dateCol.setCellValueFactory(new PropertyValueFactory<>("emploumentDateTime"));
dateCol.setCellFactory((AbstractConvertCellFactory<Person, Timestamp>) value -> new SimpleDateFormat("dd-MM-yyyy").format(value));
回答7:
This is what i did and i worked perfectly.
tbColDataMovt.setCellFactory((TableColumn<Auditoria, Timestamp> column) -> {
return new TableCell<Auditoria, Timestamp>() {
@Override
protected void updateItem(Timestamp item, boolean empty) {
super.updateItem(item, empty);
if (item == null || empty) {
setText(null);
} else {
setText(item.toLocalDateTime().format(DateTimeFormatter.ofPattern("dd/MM/yyyy")));
}
}
};
});
回答8:
You can easily pipe Properties of different type and put a formatter or converter in between.
//from my model
ObjectProperty<Date> valutaProperty;
//from my view
TableColumn<Posting, String> valutaColumn;
valutaColumn.setCellValueFactory(
cellData -> {
SimpleStringProperty property = new SimpleStringProperty();
property.bindBidirectional(cellData.getValue().valutaProperty, new SimpleDateFormat("dd.MM.yyyy", Locale.GERMAN));
return property;
});
来源：https://stackoverflow.com/questions/11412360/javafx-table-cell-formatting