如何在Grails中将特定日期格式返回为JSON？ [英] How to return specific date format as JSON in Grails?

问题描述

在Grails中，您可以使用JSON转换器在控制器中执行此操作：

  render Book.list（）as JSON 
  

渲染结果是

<$ p $
{id：1，
class：Book，
author：Stephen King，
releaseDate：'2007-04-06T00：00：00'，
title：The Shining}
]

您可以通过在Config.groovy中进行设置来控制输出日期。

  grails.converters.json.date ='javascript'//默认或Javascript 
  

然后结果会是原生javascript日期

  [
 {id：1，
class：Book ，
author：Stephen King，
easeDate：new Date（1194127343161），
title：The Shining} 
] 
  

如果我想获得如下特定的日期格式：

 releaseDate：06-04-2007
  

<我h ave使用'collect'，这需要大量的输入：

  return Book.list（）。collect（）{$ 
 class：it.class，
 author：it.author，
 releaseDate：new java.text.SimpleDateFormat（dd- MM-yyyy）.format（it.releaseDate），
 title：it.title 
] 
} as JSON 
  

有没有更简单的方法来做到这一点？

解决方案

简单的解决方案：自从Grails 1.1以来，转换器已被重写为更加模块化。不幸的是，我没有完成那个文件。它现在允许注册所谓的ObjectMarshallers（简单Pogo / Pojo实现 org.codehaus.groovy.grails.web.converters.marshaller.ObjectMarshaller 接口）。

为了达到你想要的输出，你可以在BootStrap.groovy中注册这样一个ObjectMarshaller：

  import grails.converters.JSON; 
 
 class BootStrap {
 
 def init = {servletContext  - > 
 JSON.registerObjectMarshaller（Date）{
 return it？.format（dd-MM-yyyy）
} 
} 
 def destroy = {
} 
} 
  

还有其他几种方法可以自定义转换器和I尽我所能赶上文件尽快。

In Grails, you can use the JSON converters to do this in the controller:

render Book.list() as JSON

The render result is

[
{"id":1,
 "class":"Book",
 "author":"Stephen King",
 "releaseDate":'2007-04-06T00:00:00',
 "title":"The Shining"}
]

You can control the output date by make a setting in Config.groovy

grails.converters.json.date = 'javascript' // default or Javascript

Then the result will be a native javascript date

[
{"id":1,
 "class":"Book",
 "author":"Stephen King",
 "releaseDate":new Date(1194127343161),
 "title":"The Shining"}
]

If I want to get a specific date format like this:

"releaseDate":"06-04-2007"

I have to use 'collect', which requires a lot of typing:

return Book.list().collect(){
  [
      id:it.id,
      class:it.class,
      author:it.author,
      releaseDate:new java.text.SimpleDateFormat("dd-MM-yyyy").format(it.releaseDate),
      title:it.title
  ]
} as JSON

Is there a simpler way to do this?

解决方案

There is a simple solution: Since Grails 1.1 the Converters have been rewritten to be more modular. Unfortunately I didn't finish the documentation for that. It allows now to register so called ObjectMarshallers (simple Pogo/Pojo's that implement the org.codehaus.groovy.grails.web.converters.marshaller.ObjectMarshaller interface).

To achieve your desired output, you could register such an ObjectMarshaller in BootStrap.groovy that way:

import grails.converters.JSON;

class BootStrap {

     def init = { servletContext ->
         JSON.registerObjectMarshaller(Date) {
            return it?.format("dd-MM-yyyy")
         }
     }
     def destroy = {
     }
}

There are several other ways to customize the output of the Converters and I'll do my best do catch up with the documentation asap.

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