Question

我有一个看起来像这样的传入Nifi流文件

{"filename":"ok.txt.2018-01-27-16-18-03-290","test":"{\"filename\":ok.txt,\"test\":23}","timestamp":"Sat Jan 27 16:18:03 UTC 2018"}

我想添加一个子/嵌套元素＆＃34; test＆＃34;：{＆＃34; text＆＃34;：＆＃34; Hello world＆＃34;，＆＃34; Country＆＃34;：＆＃34; Espana＆＃34;}到＆＃34;测试＆＃34;}元件。换句话说，我希望我的JSON输出看起来像

{"filename":"ok.txt.2018-01-27-16-18-03-290","test":"{\"filename\":ok.txt,\"test\":23, "text": {"Hello world","Country":"Espana"}}","timestamp":"Sat Jan 27 16:18:03 UTC 2018"}

是否可以在Nifi中将子元素添加到JSON？

谢谢

Answer 1

您可以使用ExecuteGroovyScript 1.5.0处理器使用以下代码

import groovy.json.*

def ff=session.get()
if(!ff)return

ff.write{rawIn,rawOut->
    //parse json from input stream of the flow file
    def json = rawIn.withReader("UTF-8"){reader-> 
        new JsonSlurper().parse( reader )
    }
    //modify json 
    json."test" = [
            "text"     :"Hello world",
            "Country"  :"Espana"
        ]
    //write json to flow file output stream
    rawOut.withWriter("UTF-8"){writer->
        new JsonBuilder(json).writeTo(writer)
    }
}

REL_SUCCESS << ff

Nifi：如何在JSON

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