Java BeanUtilsBean：将日期转换为字符串
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Java BeanUtilsBean : Convert Date to String
提问by d4v1dv00
I am trying to run BeanUtilsBean.getInstance().populate(...)but on the HTML form, there is a field that carries String representation of Date of Birth. The object bean has the field type of java.util.Date
我正在尝试运行，BeanUtilsBean.getInstance().populate(...)但在 HTML 表单上，有一个字段携带出生日期的字符串表示形式。对象 bean 的字段类型为java.util.Date
Read some search from Ggl that have to build custom converters but not quite understand how to do that.
从 Ggl 中阅读一些必须构建自定义转换器的搜索，但不太了解如何做到这一点。
Anyone can help?
任何人都可以帮忙吗？
My code:
我的代码：
public static void main(String[] args) {
Map<String, String[]> formData = new HashMap<String, String[]>();
formData.put("email", new String[]{"[email protected]"});
formData.put("firstName", new String[]{"danny"});
formData.put("lastName", new String[]{"miller"});
formData.put("dob", new String[]{"15-Apr-1980"});
formData.put("userName", new String[]{"dannymiller"});
try {
Consumer consumer = new Consumer();
DateTimeConverter dtConverter = new DateConverter();
dtConverter.setPattern("dd/MMM/yyyy");
ConvertUtilsBean convertUtilsBean = new ConvertUtilsBean();
convertUtilsBean.deregister(Date.class);
convertUtilsBean.register(dtConverter, Date.class);
BeanUtilsBean beanUtilsBean = new BeanUtilsBean(convertUtilsBean, new PropertyUtilsBean());
beanUtilsBean.populate(consumer, formData);
if (consumer != null) {
System.out.println(consumer.getEmail());
System.out.println(consumer.getFirstName());
System.out.println(consumer.getLastName());
System.out.println(consumer.getDob());
System.out.println(consumer.getUserName());
}
} catch (Exception e) {
e.printStackTrace();
}
The return error:
返回错误：
Apr 22, 2011 11:14:45 PM org.apache.commons.beanutils.converters.DateTimeConverter toDate WARNING: DateConverter does not support default String to 'Date' conversion. Apr 22, 2011 11:14:45 PM org.apache.commons.beanutils.converters.DateTimeConverter toDate WARNING: (N.B. Re-configure Converter or use alternative implementation) Exception in thread "main" org.apache.commons.beanutils.ConversionException: DateConverter does not support default String to 'Date' conversion. at org.apache.commons.beanutils.converters.DateTimeConverter.toDate(DateTimeConverter.java:468) at org.apache.commons.beanutils.converters.DateTimeConverter.convertToType(DateTimeConverter.java:343) at org.apache.commons.beanutils.converters.AbstractConverter.convert(AbstractConverter.java:156) at org.apache.commons.beanutils.converters.ConverterFacade.convert(ConverterFacade.java:60) at org.apache.commons.beanutils.ConvertUtilsBean.convert(ConvertUtilsBean.java:470) at org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:1008) at org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:830) at com.ymatch.test.BeanTest.main(BeanTest.java:32)
2011 年 4 月 22 日下午 11:14:45 org.apache.commons.beanutils.converters.DateTimeConverter toDate 警告：DateConverter 不支持默认字符串到“日期”的转换。2011 年 4 月 22 日下午 11:14:45 org.apache.commons.beanutils.converters.DateTimeConverter toDate 警告：（注意重新配置转换器或使用替代实现）线程“main”org.apache.commons.beanutils.ConversionException 中的异常: DateConverter 不支持默认字符串到“日期”的转换。在 org.apache.commons.beanutils.converters.DateTimeConverter.toDate(DateTimeConverter.java:468) 在 org.apache.commons.beanutils.converters.DateTimeConverter.convertToType(DateTimeConverter.java:343) 在 org.apache.commons.beanutils .converters.AbstractConverter.convert(AbstractConverter.java:156) 在 org。
采纳答案by d4v1dv00
Done using this method:
使用此方法完成：
public Object populate(Object obj, HashMap<String, String[]> formData)
throws IllegalAccessException, InvocationTargetException {
ConvertUtils
.register(new StringToDateConverter(), java.util.Date.class);
BeanUtilsBean.getInstance().populate(obj, formData);
return obj;
}
回答by Bozho
You need a SimpleDateFormatby which to parse the given string according to a specified format. For that you'd need to handle the conversion manually - name the request parameter differently and then set it manually.
您需要SimpleDateFormat根据指定的格式解析给定的字符串。为此，您需要手动处理转换 - 以不同的方式命名请求参数，然后手动设置。
But beanutils has a conversion utility, so you can use it instead (this code can be executed once per application):
但是 beanutils 有一个转换实用程序，因此您可以改用它（此代码可以为每个应用程序执行一次）：
DateTimeConverter dtConverter = new DateConverter();
dtConverter.setPattern("<your custom date pattern here>");
ConvertUtils.register(dtConverter, Date.class);
