如何将Vaadin DateField绑定到LocalDateTime

问题描述

Vaadin docs 显示了如何使用DateField与java.util.Date，但我想将DateField与BeanFieldGroup绑定到Java 8类型java.time.LocalDateTime的bean属性.我该如何实现?

The Vaadin docs show how to use the DateField with java.util.Date but I want to bind the DateField with a BeanFieldGroup to a bean property of Java 8 type java.time.LocalDateTime. How can I achieve that?

推荐答案

似乎像 Vaadin Converter 是必经之路:

package org.raubvogel.fooddiary.util;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.util.Date;
import java.util.Locale;

import com.vaadin.data.util.converter.Converter;

/**
 * Provides a conversion between old {@link Date} and new {@link LocalDateTime} API.
 */
public class LocalDateTimeToDateConverter implements Converter<Date, LocalDateTime> {

    private static final long serialVersionUID = 1L;

    @Override
    public LocalDateTime convertToModel(Date value, Class<? extends LocalDateTime> targetType, Locale locale)
            throws com.vaadin.data.util.converter.Converter.ConversionException {

        if (value != null) {
            return value.toInstant().atZone(ZoneOffset.systemDefault()).toLocalDateTime();
        }

        return null;
    }

    @Override
    public Date convertToPresentation(LocalDateTime value, Class<? extends Date> targetType, Locale locale)
            throws com.vaadin.data.util.converter.Converter.ConversionException {

        if (value != null) {
            return Date.from(value.atZone(ZoneOffset.systemDefault()).toInstant());
        }

        return null;
    }

    @Override
    public Class<LocalDateTime> getModelType() {
        return LocalDateTime.class;
    }

    @Override
    public Class<Date> getPresentationType() {
        return Date.class;
    }

}

灵感来自此链接，它将在LocalDate和Date之间转换.需要通过setConverter或通过转换器工厂.

Inspired by this link which converts between LocalDate and Date. The converter needs to be set to the DateField via setConverter or alternatively via a converter factory.

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