java - BeanUtils : populate String Date formatted map field to Date property

Question

我有这个Map<String, Object> :

Map<String, Object> map = new HashMap<String, Object>();
map.put("date", "02/11/2018@11:29:03.463+0000");

我的 bean 是:

public class MyBean {
  private Date date;
  // setters & getters
}

我正在尝试将我的 map 填充到 bean:

MyBean bean = new MyBean();
BeanUtilsBean.getInstance().populate(bean, map);

我收到此错误消息:

ConversionException: DateConverter does not support default String to 'Date' conversion.

重要:我无法更改字符串格式。

我该如何解决这个问题？

Answer 1

您必须注册转换器:

class MyDateConverter implements Converter {
   private final DateFormat format = new SimpleDateFormat("dd/MM/yyyy@HH:mm:ss.SSSZ");
   public Object convert(Class type, Object value) {
       if(value == null) {
           return null;
       } else { // parse your date format with date formatter
           try {
               return format.parse((String) value);
           } catch (ParseException e) {
               throw new RuntimeException(e);
           }
        }
    }
}

并像这样使用它:

ConvertUtilsBean convertUtilsBean = new ConvertUtilsBean();
convertUtilsBean.register(new MyDateConverter(), Date.class);

BeanUtilsBean beanUtilsBean =
          new BeanUtilsBean(convertUtilsBean, new PropertyUtilsBean());

MyBean bean = new MyBean();
beanUtilsBean.populate(bean, map);