使用POI读取xlsx文件(SXSSFWorkbook)

Question

我正在尝试用POI读取大型xlsx文件的第一次测试,但是使用小文件进行简单测试我无法显示单元格的值.

有人可以告诉我,我的错误是什么.欢迎提出所有建议.谢谢.

Test.java:

import java.io.File;
import java.io.FileInputStream;

import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class Test {

    public static void main(String[] args) throws Throwable {
        File file = new File("/tmp/test.xlsx");
        OPCPackage pkg = OPCPackage.open(new FileInputStream(file.getAbsolutePath()));
        XSSFWorkbook xssfwb = new XSSFWorkbook(pkg);

        SXSSFWorkbook wb = new SXSSFWorkbook(xssfwb, 100);
        Sheet sh = wb.getSheet("Hola");

        System.out.println("Name: "+sh.getSheetName()); // Line 19
        System.out.println("Val: "+sh.getRow(1).getCell(1).getStringCellValue()); // Line 20
    }
}

结果:

Name: Hola
Exception in thread "main" java.lang.NullPointerException
    at Test.main(Test.java:20)

test.xlsx:

Answer 1

请咨询:类似问题 SXSSFWorkBook是只写的,它不支持阅读.

对于.xlsx文件的低内存读取,您应该查看XSSF和SAX EventModel文档:Gagravarr

如果内存不是问题,你可以使用XSSFSheet,例如

    File file = new File("D:/temp/test.xlsx");
    FileInputStream fis = new FileInputStream(file);
    XSSFWorkbook wb = new XSSFWorkbook(fis);

    XSSFSheet sh = wb.getSheet("Hola");
    System.out.println(sh.getLastRowNum());
    System.out.println("Name: "+sh.getSheetName()); 
    Row row = sh.getRow(1);

    System.out.println(row.getRowNum());

    System.out.println("Val: "+sh.getRow(1).getCell(1).getStringCellValue());