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Working with csv / excel files in apex

Hello! All,


I come from background and have worked on many projects that creates/modifies files. 


I am looking for something similar in Apex. By now I figured the basic of writing Apex code, now I want to create csv files in apex trigger which automatically gets stored in one of shared folder. 


Is that even possible using apex. Thanks for reading. 


Apex is somewhat like a server side language, so using apex you cannot create documents in local systems, what you can do is create documents in Document object.


Hope this helps.



makes sense .. I am trying to figure how can I read a csv/excell file, process the file data on cloud and again store the output again in a file. 


The file that I read will come from different system and file I output will be read by same system. 


Can you guide how can I read csv file in SF document folder and later post the file there. I can ask the user to dump the file to that folder and later get it from there as well ..  


what other options I have..  webservice maybe??