将 Java Object 转换为 java 中的 TSV

Question

I generate a report where I read data from postgresql and then populate a Java object Below is kind of sample skeleton where I want to show there are many collection object within Main object ie ReportMessageStructure public class ReportMessageStructure {

protected MessageHeader messageHeader;

protected MessageDuration messageDuration;

protected ObjectA sampleListA;

protected ObjectB sampleListB;

protected ObjectC smapleListC;

}

Now My requirement is to write data into TSV file. Could you please suggest me best way to do this. I know I can use JAXB if I had to convert into XML. However need way to convert into TSV. Any tips/suggestion would be great help.

Max size the data will produce would be around 700MB from object to TSV

Answer 1

You can use CSVPrinter from Apache Commons CSV library with CSVFormat equal to TDF .

try (CSVPrinter printer = new CSVPrinter(new FileWriter("csv.txt"), CSVFormat.TDF)) {
     printer.printRecord("id", "userName", "firstName", "lastName", "birthday");
     printer.printRecord(1, "john73", "John", "Doe", LocalDate.of(1973, 9, 15));
     printer.println();
     printer.printRecord(2, "mary", "Mary", "Meyer", LocalDate.of(1985, 3, 29));
 } catch (IOException ex) {
     ex.printStackTrace();
 }