从控制器中的params绑定Grails日期 [英] Binding a Grails date from params in a controller

问题描述

为什么很难通过grails控制器中的params从视图中提取日期？

我不想手动提取日期this：

  instance.dateX = parseDate（params [dateX_value]）// parseDate来自我的帮助类
  

我只想使用 instance.properties = params 。

在模型中，类型是 java.util.Date ，在params中是所有的信息： [dateX_month：'value'，dateX_day：'value'，...]

没有什么。我希望Grails 1.3.0能帮助但仍然是一样的。

我不能，不会相信手工提取日期是必要的！

解决方案

Grails版本> = 2.3

Config.groovy 定义在将参数绑定到日期

$时应用程序范围内使用的日期格式b $ b

  grails.databinding.dateFormats = [
'MMddyyyy'，'yyyy-MM-dd HH：mm：ss.S'，yyyy-MM- dd'T'hh：mm：ss'Z'
] 
  

grails.databinding.dateFormats 将按照列表中的顺序尝试。

可以使用 @BindingFormat

覆盖单个命令对象的这些应用程序范围格式。

  import org.grails.databinding.BindingFormat 
 
类Person {
 @BindingFormat（'MMddyyyy'）
 Date birthDate 
} 
  

Grails版本< 2.3

我不能，也不会相信用手提取日期是必要的！

< blockquote>

您的顽固性得到了回报，可以直接绑定一个日期早在Grails 1.3之前。步骤如下：

（1）创建一个注册日期格式编辑器的类

  import org.springframework.beans.PropertyEditorRegistrar 
 import org.springframework.beans.PropertyEditorRegistry 
 import org.springframework.beans.propertyeditors.CustomDateEditor 
 import java.text.SimpleDateFormat 
 
 public class CustomDateEditorRegistrar实现PropertyEditorRegistrar {
 
 public void registerCustomEditors（PropertyEditorRegistry registry）{
 
 String dateFormat =' yyyy / MM / dd'
 registry.registerCustomEditor（Date，new CustomDateEditor（new SimpleDateFormat（dateFormat），true））
} 
} 
  / pre> 
 
 
 （2）通过注册 grails-app / conf / spring / resources.groovy  
  beans = {
 customPropertyEditorRegistrar（CustomDateEditorRegistrar）
} 
  
 （3）格式为 yyyy / MM / dd 的名为 foo 的参数将自动绑定到名为 foo 使用：
  myDomainObject.properties = params 
  
或
  new MyDomainClass params）
  
 
Why is it so hard to extract the date from the view via the params in a grails controller?

I don't want to extract the date by hand like this:
instance.dateX = parseDate(params["dateX_value"])//parseDate is from my helper class
I just want to use instance.properties = params.

In the model the type is java.util.Date and in the params is all the information: [dateX_month: 'value', dateX_day: 'value', ...]

I searched on the net and found nothing on this. I hoped that Grails 1.3.0 could help but still the same thing.

I can't and will not believe that extracting the date by hand is necessary!
解决方案
Grails Version >= 2.3

A setting in Config.groovy defines the date formats which will be used application-wide when binding params to a Date
grails.databinding.dateFormats = [
        'MMddyyyy', 'yyyy-MM-dd HH:mm:ss.S', "yyyy-MM-dd'T'hh:mm:ss'Z'"
]
The formats specified in grails.databinding.dateFormats will be attempted in the order in which they are included in the List.

You can override these application-wide formats for an individual command object using @BindingFormat
import org.grails.databinding.BindingFormat

class Person { 
    @BindingFormat('MMddyyyy') 
    Date birthDate 
}


Grails Version < 2.3


  
i can't and will not belief that extracting the date by hand is nessesary!
Your stubbornness is rewarded, it has been possible to bind a date directly since long before Grails 1.3. The steps are:

(1) Create a class that registers an editor for your date format
import org.springframework.beans.PropertyEditorRegistrar
import org.springframework.beans.PropertyEditorRegistry
import org.springframework.beans.propertyeditors.CustomDateEditor
import java.text.SimpleDateFormat

public class CustomDateEditorRegistrar implements PropertyEditorRegistrar {

    public void registerCustomEditors(PropertyEditorRegistry registry) {

        String dateFormat = 'yyyy/MM/dd'
        registry.registerCustomEditor(Date, new CustomDateEditor(new SimpleDateFormat(dateFormat), true))
    }
}
(2) Make Grails aware of this date editor by registering the following bean in grails-app/conf/spring/resources.groovy
beans = {
    customPropertyEditorRegistrar(CustomDateEditorRegistrar)
}
(3) Now when you send a date in a parameter named foo in the format yyyy/MM/dd it will automatically be bound to a property named foo using either:
myDomainObject.properties = params
or 
new MyDomainClass(params)


                        
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