如何在groovy中修改JSON [英] How to modify JSON in groovy

问题描述

我使用JsonBuilder来构建JSONObject / String。

但是，如何更新/更改此JSONObject / String中一个字段的值？

我没有看到使用JsonBuilder做这件事的可能性。那么我使用什么？

JsonBuilder，那么你可以这样做：
$ b

  import groovy.json。* 
 
 def map = [users ：[[name：'tim'，posts：43]，[name：'alice'，posts：72]]] 
 
 JsonBuilder builder = new JsonBuilder（map）
 
 builder.content.users [0] .name ='dave'
 
 assert builder.toString（）=='{users：[{name：dave，posts ：43}，{name：alice，posts：72}]}'
  

但是由于 content 没有从对象中显式导出，所以我称之为副作用，并且不会依赖它在未来版本的Groovy中工作。

在将它传递给 JsonBuilder 之前，更好地获取您的地图，或者如果这不可行我想你会需要使用 JsonSlurper 修改生成的Map，然后用<$重建Json字符串来解析Json字符串c $ c> JsonBuilder 再次。

I use JsonBuilder to build a JSONObject/String.

But, how can I update/change value of one field in this JSONObject/String?

I am not seeing the possibility of doing this using JsonBuilder. What show I use then?

解决方案

If you have to change the content you already put into the JsonBuilder, then you could do:

import groovy.json.*

def map = [ users:[ [ name:'tim', posts:43 ], [ name:'alice', posts:72 ] ] ]

JsonBuilder builder = new JsonBuilder( map )

builder.content.users[ 0 ].name = 'dave'

assert builder.toString() == '{"users":[{"name":"dave","posts":43},{"name":"alice","posts":72}]}'

But as content is not explicitly exported from the Object, I'd call this a side-effect and would not rely on it working in future versions of Groovy.

Better to get your map right before you pass it to JsonBuilder, or if that isn't possible I guess you'll need to parse the Json string with JsonSlurper modify the resulting Map and then rebuild the Json with JsonBuilder again.

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