groovy : poi XLSX2CSV

jar tvf poi-ooxml-3.10-FINAL-20140208.jar | findstr OPCPackage
可见 org/apache/poi/openxml4j/opc/OPCPackage.class

jar tvf poi-examples-3.10-FINAL-20140208.jar | findstr XLSX2CSV
可见 org/apache/poi/xssf/eventusermodel/XLSX2CSV.class

示例代码: xlsx2csv.groovy

//package test;
import org.apache.poi.openxml4j.opc.*;
import org.apache.poi.xssf.eventusermodel.XLSX2CSV;

if (args.length < 1) {
    System.err.println("Use:");
    System.err.println("  XLSX2CSV <xlsx file> [min columns]");
    return;
}
def file1 = args[0]
File xlsxFile = new File(file1);
if (!xlsxFile.exists()) {
    System.err.println("Not found or not a file: " + xlsxFile.getPath());
    return;
}

def file2 = file1.replace('.xlsx','.csv')
File csvFile = new File(file2);
if ( csvFile.exists()) {
    System.err.println(file2+": csvFile is exists. " );
    return;
}

int minColumns = -1;
if (args.length >= 2)
    minColumns = Integer.parseInt(args[1]);

// System.out redirect
def out = new PrintStream(file2);
System.setOut(out);

// The package open is instantaneous,as it should be.
OPCPackage p = OPCPackage.open(xlsxFile.getPath(),PackageAccess.READ);
XLSX2CSV xlsx2csv = new XLSX2CSV(p,out,minColumns);
xlsx2csv.process();
out.close();