问题
I am trying to read a csv from local file system and convert the content into JSON format using Apache Nifi and put the JSON format file in the local system. I have succeeded in converting the first row of csv file but not other rows. What am I missing?
Input:
1,aaa,loc1
2,bbb,loc2
3,ccc,loc3
and my nifi workflow is as here: http://www.filedropper.com/mycsvtojson
My output is as below which is desired format but I want that to happen for all the rows.
{ "id" : "1", "name" : "aaa",
"location" : "loc1" }
回答1:
There are a few different ways this could be done...
- A custom Java processor that reads in a CSV and converts to JSON
- Using the ExecuteScript processor to do something similar in a Groovy/Jython script
- Use SplitText to split your original CSV into single lines, then use your current approach with ExtractText and ReplaceText, and then a MergeContent to merge back together
- Use ConvertCsvToAvro and then ConvertAvroToJson
Although the last option makes an extra conversion to Avro, it might be the easiest solution requiring almost no work.
回答2:
This question is a bit older, but there is now a ConvertRecord processor in NiFi 1.3 and newer, which should be able to handle this conversion directly for you, and it avoids having to use split up the data by creating a single JSON array with all of the values, if that is desirable.
来源：https://stackoverflow.com/questions/37928832/convert-a-csv-file-to-json-using-apache-nifi