Grails 3.2中的Java 8 LocalDate JSON视图 [英] Java 8 LocalDate in Grails 3.2 JSON view

问题描述

当我尝试使用 json view ，我收到一个堆栈溢出异常，这似乎与GSON实现不知道Java 8 LocalDateTime有关。

下面是一个示例（ grails视图和JSON文档）：

域类Person

  import java.time.LocalDate 
 class Person 
 {
 Sting name 
 LocalDate birthDate 
} 
  

PersonController

  class PersonController 
 {
 def index（）{
 respon Person。 findAll（）as List< Person> 
 
 
 $ / code $ / pre 
 
 $ p $ index $ / $ $ $ 
 $ b 
  @Field List< Person> personList 
 
 json tmpl.person（personList）
  
 _person.gson模板文件 
 
 
  model 
 {
 Person person 
} 
 
 json g.parse（person）
  
当我试图打开这个视图时，抛出了一个堆栈溢出异常： 
 $ b 
 
 
引起：grails.views.ViewRenderException：呈现视图时出错：
 null 
 at grails.views.AbstractWritableScript .writeTo（AbstractWritableScript.groovy：43）
 at grails.plugin.json.view.api.internal.DefaultGrailsJsonViewHelper $ 6.writeTo（DefaultGrailsJsonViewHelper.groovy：677） 
 
当我将_person.gson简化为： 
 
 
  ... 
 json 
 {
 name person.name 
} 
  
 Thew查看按预期工作。
 
 
 
我的问题是
 
 
 
是否有默认方式处理Java 8 LocalDate / Time PROPERT Grails JSON视图中是否存在？ 
如果不是，我该如何永久注册一个新的GSON构建器 
 
 
 
 
 
 
 
 
这个问题是相关的： 
 
 
 我试图实现这一点： https://github.com/gkopff/gson-javatime-serialisers 但这不会将自己注入为新的默认de / serializer并需要手动使用 
 
 
 
解决方案这些java 8日期支持尚未在json视图中实现。这可以在当时使用视图1.2.0（当它被发布时）以及最新版本的grails-java8插件。
 
 
 
编辑：到澄清，只有在使用内置渲染策略时才支持（g.render，hal.render，jsonapi.render等）。您仍然可以以任何您想要的方式自行构建视图：
  json {
 someLocalDate LocalDate.now.format（ ...）
} 
  
 Edit2：Json视图1.2与grails一起发布-java8插件（也是1.2版）。 Java 8的日期类型渲染现在支持2个插件一起使用。
 
When I try to parse a simple domain model object containing a Java 8 LocalDateTime using a json view, I receive a stack overflow exception, that seems to be related to the fact that the GSON implentation does not know about Java 8 LocalDateTime.

Here is an example (documentation of grails views and JSON):

Domain class "Person"
import java.time.LocalDate
class Person
{
    Sting name
    LocalDate birthDate
}
PersonController
class PersonController
{
    def index() {
        respond Person.findAll() as List<Person>
    }
}
index.gson view
@Field List<Person> personList

json tmpl.person(personList)
_person.gson template file
model 
{
   Person person
}

json g.parse(person)
When I try to open this view, a stack overflow exception is thrown:

  
Caused by: grails.views.ViewRenderException: Error rendering view:
  null
          at grails.views.AbstractWritableScript.writeTo(AbstractWritableScript.groovy:43)
          at grails.plugin.json.view.api.internal.DefaultGrailsJsonViewHelper$6.writeTo(DefaultGrailsJsonViewHelper.groovy:677)
When I simplify the _person.gson to this:
...
json 
{
   name person.name
}
Thew view works as expected.

My question is

Is there a default way to handle Java 8 LocalDate/Time properties in Grails JSON views?
And If not, how can I register a new GSON builder permanently




This question is related: How to serialize and deserialize Java 8's java.time types with Gson?
I tried to implemented this: https://github.com/gkopff/gson-javatime-serialisers but this won't inject itself as new default de/serializer and needs to be used manually

解决方案
These java 8 date support is not yet implemented in json views. This will work out of the box with views 1.2.0 (when it is released) and the latest version of the grails-java8 plugin at that time.

Edit: To clarify, it is only not supported when using the built in rendering strategy (g.render, hal.render, jsonapi.render, etc). You can still construct the views yourself in any way you want:
json {
    someLocalDate LocalDate.now.format(...)
}
Edit2: Json views 1.2 has been released along with the grails-java8 plugin (also version 1.2). Java 8 date type rendering is now supported out of the box with the 2 plugins together.

                        
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