如何使用 Apache POI 读取所有单元格值？答案

【问题标题】：how to read all cell value using Apache POI?如何使用 Apache POI 读取所有单元格值？
【发布时间】：2021-09-14 20:24:15
【问题描述】：

我想使用 Apache POI 从 excel 表中读取所有单元格值并将其存储到一维字符串数组中。是否可以逐行从 excel 中读取数据并从每个单元格中提取值？

请帮我解决这个问题。

谢谢

【问题讨论】：

标签： java apache-poi

【解决方案1】：

导入 java.io.FileInputStream；导入 java.util.Iterator；导入 java.util.Vector；

导入 org.apache.poi.hssf.usermodel.HSSFCell; 导入 org.apache.poi.hssf.usermodel.HSSFRow；导入 org.apache.poi.hssf.usermodel.HSSFSheet；导入 org.apache.poi.hssf.usermodel.HSSFWorkbook；导入 org.apache.poi.poifs.filesystem.POIFSFileSystem;

公共类 ReadExcelFile {

public static void main( String [] args ) {

    String fileName="C:\\temp\\testPOI.xls";
    //Read an Excel File and Store in a Vector
    Vector dataHolder=readExcelFile(fileName);
    //Print the data read
    printCellDataToConsole(dataHolder);
}
public static Vector readExcelFile(String fileName)
{
    /** --Define a Vector
        --Holds Vectors Of Cells
     */
    Vector cellVectorHolder = new Vector();

    try{
    /** Creating Input Stream**/
    //InputStream myInput= ReadExcelFile.class.getResourceAsStream( fileName );
    FileInputStream myInput = new FileInputStream(fileName);

    /** Create a POIFSFileSystem object**/
    POIFSFileSystem myFileSystem = new POIFSFileSystem(myInput);

    /** Create a workbook using the File System**/
     HSSFWorkbook myWorkBook = new HSSFWorkbook(myFileSystem);

     /** Get the first sheet from workbook**/
    HSSFSheet mySheet = myWorkBook.getSheetAt(0);

    /** We now need something to iterate through the cells.**/
      Iterator rowIter = mySheet.rowIterator();

      while(rowIter.hasNext()){
          HSSFRow myRow = (HSSFRow) rowIter.next();
          Iterator cellIter = myRow.cellIterator();
          Vector cellStoreVector=new Vector();
          while(cellIter.hasNext()){
              HSSFCell myCell = (HSSFCell) cellIter.next();
              cellStoreVector.addElement(myCell);
          }
          cellVectorHolder.addElement(cellStoreVector);
      }
    }catch (Exception e){e.printStackTrace(); }
    return cellVectorHolder;
}

private static void printCellDataToConsole(Vector dataHolder) {

    for (int i=0;i<dataHolder.size(); i++){
               Vector cellStoreVector=(Vector)dataHolder.elementAt(i);
        for (int j=0; j < cellStoreVector.size();j++){
            HSSFCell myCell = (HSSFCell)cellStoreVector.elementAt(j);
            String stringCellValue = myCell.toString();
            System.out.print(stringCellValue+"\t");
        }
        System.out.println();
    }
}

}

【讨论】：

【解决方案2】：

有一个关于 Java 世界的文档，It's POI-Fect 向您展示了这是如何实现的。

例子：

String fileName = "C:/MyExcelFile.xls"; // file we are interested in
POIFSFileSystem fileSystem = new POIFSFileSystem(new FileInputStream(fileName));
HSSFWorkbook workbook = new HSSFWorkbook(fileSystem);
HSSFSheet sheet = workbook.getSheetAt(0); //Get first Excel Sheet

//STRING and NUMERIC are now Enums from org.apache.poi.ss.usermodel
for (Row row : sheet) {
        for (Cell cell: row) {
            switch (cell.getCellTypeEnum()) {
                case STRING:
                    System.out.print(cell.getStringCellValue() + "\t\t\t");
                    break;
                case NUMERIC:
                    System.out.print(cell.getNumericCellValue() + "\t\t\t");
                    break;
                default:
            }
        }
        System.out.println("");
    }

【讨论】：

@Buhade Sindi CELL_TYPE_NUMERIC,CELL_TYPE_STRING, getCellType() ，这些所有功能都已弃用，请做必要的事情