nifi 中的 JSON 数组到多个 JSON 对象 [英] Array of JSON to Mupliple JSON Object in nifi

问题描述

我想在 Nifi 中实现以下请求-响应场景.我的目标是在更多不同的处理器中使用每个值作为数组(对象键 1，对象键 2，...).

因此，如果我可以将其转换为多个 JSON，那么使用拆分 JSON 之后我可以使用多个值.

请为此提出各种解决方案.

输入 JSON:

<预><代码>[{"ID": "789654","日期": "2 月 29 日",键":[对象键 1"、对象键 2"、对象键 3"....]}]

输出 JSON:

<预><代码> [{"ID": "789654","日期": "2 月 29 日",Key1":对象键 1"},{"ID": "789654","日期": "2 月 29 日","Key2" : "对象键 2"},{"ID": "789654","日期": "2 月 29 日","Key3" : "对象键 3"},......]

解决方案

你有两层数组.我假设在根数组中你可以有几个对象

<预><代码>[{"ID" : "111",日期":2 月 29 日"，"键" : ["对象键 1"、"对象键 2"、"对象键 3"、"对象键 4"]},{"ID" : "222",日期":2 月 27 日"，"Key" : ["对象键 5", "对象键 6"]}]

使用以下流程

• SplitJson - 通过根数组分割文件 $
• EvaluateJsonPath - 将 $.ID 和 $.Date 值提取到具有相应名称的属性中
• SplitJson - 通过 $.Key
拆分文件
• ReplaceText - 上一步的结果是无效的 json，因为 Key 中有一个字符串数组.你必须用双引号将字符串包裹在内容中:(?s)(^.*$) -> "$1"
• EvaluateJsonPath - 从上下文 $ 中提取字符串到 Key 属性
• AttributesToJson - 从属性构建 json 的最后一步

<小时>

非常另类的变体

在脚本中使用 ExecuteGroovyScript:

@Grab(group='acme.groovy', module='acmenifi', version='20190218')导入静态 groovyx.acme.nifi.AcmeNiFi.*withFlowFile(this).withJson{json,attr->json.each{o1->o1.Key.each{k1->//用json构建新文件newFlowFile(this).withJson{json2,attr2->attr2.putAll(attr)return o1 + [Key:k1]//设置新流文件的内容}}}return null//删除当前文件}

I want to achieve the below request-response scenario in Nifi. My objective is to use each value coming as an array(object key 1,object key 2,...) in further differt processors.

So if I can convert it into multiple JSON, then using split JSON I can use multiple vales later.

Please suggest all sorts of solution for this.

Input JSON:

[
    { 
         "ID": "789654",
         "Date": "29th Feb",
         "Key" : ["object key 1", "object key 2", "object key 3"....]
    }
]

Output JSON:

        [
            { 

             "ID": "789654",

            "Date": "29th Feb",

            "Key1" : "object key 1"

           },

           { 

             "ID": "789654",

            "Date": "29th Feb",

            "Key2" : "object key 2"

           },

          { 

             "ID": "789654",

            "Date": "29th Feb",

            "Key3" : "object key 3"

           },
           .
           .
           .
           .
           .
           .

         ]

解决方案

you have two levels array. i assume in the root array you could have several objects

[
    {
        "ID" : "111",
        "Date" : "29th Feb",
        "Key" : ["object key 1", "object key 2", "object key 3", "object key 4"]
    },
    {
        "ID" : "222",
        "Date" : "27th Feb",
        "Key" : ["object key 5", "object key 6"]
    }
]

use the following flow

• SplitJson - split file by a root array $
• EvaluateJsonPath - extract $.ID and $.Date values into attributes with corresponding names
• SplitJson - split files by $.Key
• ReplaceText - the result of previous step is non-valid json because you have an array of strings in Key. you have to wrap string in content with doublequotes: (?s)(^.*$) -> "$1"
• EvaluateJsonPath - extract string from context $ into Key attribute
• AttributesToJson - the last step to build json from attributes

---

extremely alternative variant

Use ExecuteGroovyScriptwith script:

@Grab(group='acme.groovy', module='acmenifi', version='20190218')
import static groovyx.acme.nifi.AcmeNiFi.*

withFlowFile(this).withJson{json,attr->
    json.each{o1->
        o1.Key.each{k1-> 
            //build new file with json
            newFlowFile(this).withJson{json2,attr2->
                attr2.putAll(attr)
                return o1 + [Key:k1] //set content of new flow file
            }
        }
    }
    return null //drop current file
}

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