程序停止尝试读取 Excel 工作簿 (Apache POI)

Question

我正在尝试读取 Excel 工作簿 ( .xlsx)，但程序在初始化Workbook. 我不确定发生了什么，因为它没有给出任何错误。

当我说暂停时，我的意思是程序只是暂停。它仍在运行，但我觉得它卡住了，不确定。

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

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelReader 
{
    private String excelFilePath;
    private FileInputStream inputStream;
    private Workbook workbook;
    private Sheet sheet;

    // Constructors
    public ExcelReader() {
        try {           
            // Get path to excel workbook and put in stream
            excelFilePath = "/home/flow/project/mydata.xlsx";
            inputStream = new FileInputStream(new File(excelFilePath));

            // Get type of workbook  (Excel 2003 or Excel 2007+)
            workbook = getWorkbook();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // Get type of workbook (Excel 2003 or Excel 2007+)
    private Workbook getWorkbook() {    
        Workbook work = null;

        try {
            if(excelFilePath.endsWith("xlsx"))  {
                System.out.println("In firstIf");               // Prints this
                work = new XSSFWorkbook(inputStream);           // Gets stuck here
                System.out.println("After XSSF");               // Never prints this
            }
            else if(excelFilePath.endsWith("xls"))  {
                work = new HSSFWorkbook(inputStream);
            }
            else
                throw new IllegalArgumentException("The specified file is not an Excel file");

        } catch (Exception e) {
            e.printStackTrace();
        }

        return work;
    }
}

我究竟做错了什么？为什么程序永远不会移动到下一行？

Answer 1

我不明白为什么程序一直停止，所以我降级到 3.9 版本并让代码正常工作。感谢Gagravarr，我能够通过摆脱整个getWorkbook()方法和FileInputStream类来减少内存的使用。

改成workbook = getWorkbook()这样：

workbook = WorkbookFactory.create(new File(excelFilePath));

它将创建适当的XSSFWorkbook或HSSFWorkbook.

来源：WorkbookFactory.create(...)