apache-commons

Invalid char between encapsulated token and delimiter in Apache Commons CSV library

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We ran into this issue when we had embedded quote in our data. 0,”020″1,”BS:5252525 ORDER:99999″4 Solution applied was CSVFormat csvFileFormat = CSVFormat.DEFAULT.withQuote(null); @Cuga tip helped us to resolve. Thanks @Cuga Full code is public static void main(String[] args) throws IOException { FileReader fileReader = null; CSVFormat csvFileFormat = CSVFormat.DEFAULT.withQuote(null); String fileName = “test.csv”; fileReader = … Read more

Is it safe to use Apache commons-io IOUtils.closeQuietly?

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The code should look like this regarding to the javadoc of closeQuietly(): BufferedWriter bw = null; try { bw = new BufferedWriter(new FileWriter(“test.txt”)); bw.write(“test”); bw.flush(); // you can omit this if you don’t care about errors while flushing bw.close(); // you can omit this if you don’t care about errors while closing } catch (IOException … Read more

Copy specific fields by using BeanUtils.copyProperties?

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You can use the BeanWrapper technology. Here’s a sample implementation: public static void copyProperties(Object src, Object trg, Iterable<String> props) { BeanWrapper srcWrap = PropertyAccessorFactory.forBeanPropertyAccess(src); BeanWrapper trgWrap = PropertyAccessorFactory.forBeanPropertyAccess(trg); props.forEach(p -> trgWrap.setPropertyValue(p, srcWrap.getPropertyValue(p))); } Or, if you really, really want to use BeanUtils, here’s a solution. Invert the logic, gather excludes by comparing the full property … Read more

Apache Commons Net FTPClient and listFiles()

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Found it! The thing is you want to enter passive mode after you connect, but before you log in. Your code returns nothing for me, but this works for me: import org.apache.commons.net.ftp.FTPClient; import java.io.IOException; import org.apache.commons.net.ftp.FTPFile; public class BasicFTP { public static void main(String[] args) throws IOException { FTPClient client = new FTPClient(); client.connect(“c64.rulez.org”); client.enterLocalPassiveMode(); … Read more

Apache Commons CLI – option type and default value

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EDIT: Default values are now supported. See answer https://stackoverflow.com/a/14309108/1082541 below. As Brent Worden already mentioned, default values are not supported. I had issues with using Option.setType too. I always got a null pointer exception when calling getParsedOptionValue on an option with type Integer.class. Because the documentation was not really helpful I looked into the source … Read more

SpringBoot: Large Streaming File Upload Using Apache Commons FileUpload

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Thanks to some very helpful comments by M.Deinum, I managed to solve the problem. I have cleaned up some of my original post and am posting this as a complete answer for future reference. The first mistake I was making was not disabling the default MultipartResolver that Spring provides. This ended up in the resolver … Read more

Java – Append quotes to strings in an array and join strings in an array

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With Java 8+ Java 8 has Collectors.joining() and its overloads. It also has String.join. Using a Stream and a Collector The naive but effective way String wrapWithQuotesAndJoin(List<String> strings) { return strings.stream() .map(s -> “\”” + s + “\””) .collect(Collectors.joining(“, “)); } Shortest and probably better performing (somewhat hackish, though) String wrapWithQuotesAndJoin(List<String> strings) { return strings.stream() … Read more

No header mapping was specified, the record values can’t be accessed by name (Apache Commons CSV)

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Calling withHeader() to the default Excel CSV format worked for me: CSVFormat.EXCEL.withHeader().parse(in); The sample in the documentation is not very clear, but you can found it here : Referencing columns safely: If your source contains a header record, you can simplify your code and safely reference columns, by using withHeader(String…) with no arguments: CSVFormat.EXCEL.withHeader();

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