I could imagine a processor that runs once every 24 hours on a cron Names, then perform the extract of the one file I need and process it (when I know all files for the previous 24 hours will be present),įind that set of files for that day using the yyymmdd part of file I need to scan the NFS files after 8 AM every day So, where I am having a hard time visualizing doing this in Nifi is I cannot delete the NFS file after the copy to HDFS because others Line (the headers), and store it in HDFS compressed again using gzipĥ. I need to extract that one file from each zip, strip off the first I need just one of those CSVs from each zip file each day and theyĤ. Each zip file contains 4 or more large CSV filesģ. 160 zip files/day show up on an NFS share in various subĭirectories and their filenames contain the yyyymmddHHMMSS of when theĢ. Users might provide some thoughts on my problem?ġ. Like flow and would like to try to start, as a new user to Nifi, usingĪ "best practice" approach. I'm running HDP and need to construct an ETL Private static Logger logger = Logger.getLogger(CsvToExcel.I stumbled onto Nifi at a Laurel, MD Spark meetup and was prettyĮxcited about using it. Public static final String FILE_NAME = "EXCEL_DATA" Public static final String FILE_EXTN = ".xlsx" Public static final char FILE_DELIMITER = ',' Let’s see the simple code snippet that follows this implementation.ĬsvToExcel.java package 2excel The complete Java code to convert a Csv file to the Excel format is provided below. 9: Java Class (AppMain.java) 3.2.1 Implementation of Utility Class Right-click on the src/main/java folder, New -> Package.įig. The rest dependencies will be automatically resolved by the Maven framework and the updated file will have the following code: Here, we specify the dependencies for the OpenCsv, Apache POI, and Log4j. Application Buildingīelow are the steps involved in developing this application. It will have the following code:ĭevelopers can start adding the dependencies that they want to like OpenCsv, Apache POI etc. If you observe, it has downloaded the maven dependencies and a pom.xml file will be created. Having said that, we have tested the code against JDK 1.7 and it works well.Ĭlick on Finish and the creation of a maven project is completed. We are using Eclipse Kepler SR2, JDK 8 and Maven. Java Convert Csv to Excel File Example 2.1 Tools Used Now, open up the Eclipse Ide and let’s see how to implement this conversion with the help of Apache POI library! 2. Note: If developers are getting the exception, then the developers must use the low-memory footprint SXSSF API implementation.
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