Question

我有一个excel文件，其中有一些列，如Firstname，LastName，ID等.... 我想获取每个给定列的所有数据并将它们存储在对象的arraylist中。问题是，我无法确保我获得的数据属于一个明确的列名，如Firstname列或LastName或其他列。例如，现在我有一个excel文件，其序列为 （LastName，Firstname，ID） ，第二个excel文件具有不同的序列 （ID，姓氏，名字） 即可。 如何确保此姓氏用于此名字和ID？ 我做了一些研究，但我根本得不到一些东西。如果有人可以帮助我，我将不胜感激。

import javax.swing.JFileChooser;
import javax.swing.JOptionPane;

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

import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ReadExcelDemo 
{
ArrayList<Data> list = new ArrayList<>();
String path;

public ReadExcelDemo(String path)
{

   this.path = path;

    try
    {
        FileInputStream file = new FileInputStream(new File(path));

        //Create Workbook instance holding reference to .xlsx file
        XSSFWorkbook workbook = new XSSFWorkbook(file);

        //Get first/desired sheet from the workbook
        XSSFSheet sheet = workbook.getSheetAt(0);

         System.out.println("");

        //Iterate through each rows one by one
        Iterator<Row> rowIterator = sheet.iterator();
        while (rowIterator.hasNext()) 
        {
            Row row = rowIterator.next();
            //For each row, iterate through all the columns
            Iterator<Cell> cellIterator = row.cellIterator();

            while (cellIterator.hasNext()) 
            {

                Cell cell = cellIterator.next();

                cell.setCellType(Cell.CELL_TYPE_STRING);
                //Check the cell type and format accordingly



                JOptionPane.showMessageDialog(null,cell.getAddress()); 
                switch (cell.getCellType()) 
                {

                    case Cell.CELL_TYPE_NUMERIC:

                        System.out.print(cell.getNumericCellValue() + "\t");

                        break;
                    case Cell.CELL_TYPE_STRING:

                        System.out.print(cell.getStringCellValue() + "\t");
                        break;
                }

            }


            System.out.println("");
        }
        file.close();
    } 
    catch (Exception e) 
    {
        e.printStackTrace();
    }
}
}

这是我的Arraylist学生班

public class Student {

private String Firstname;
private String LastName;
private String Username;


public Student(String firstname, String lastName, String username) {

    this.Firstname = firstname;
    this.LastName = lastName;
    this.Username = username;
}

public String getFirstname() {
    return Firstname;
}
public void setFirstname(String firstname) {
    Firstname = firstname;
}

public String getLastName() {
    return LastName;
}
public void setLastName(String lastName) {
    LastName = lastName;
}
public String getUsername() {
    return Username;
}
public void setUsername(String username) {
    Username = username;
}

}

这是我的主要课程

import java.io.IOException;

public class Main {

public static void main(String[] args) throws IOException {

ReadExcelDemo re = new ReadExcelDemo( "E:/St.xlsx");
}

}

This is the result of my current code

This an example of my excel file

Answer 1

在您的情况下，您阅读的前3个单元格是列的名称。

您可以使用row.getCell（columnIndex） 看看那段代码。它按列获取数据：

for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
  row = sheet.getRow(rowIndex);
  if (row != null) {
    String cellValueMay = null;
    for (int colIndex = 0; colIndex < colCount; colIndex++) {
      if (colIndex == theColIndexYouWant) {
        cell = row.getCell(colIndex);
        if (cell != null) {
          // Found column and there is value in the cell.
          cellValueMaybeNull = cell.getStringCellValue();
          break;
        }
    }

    // Do something with the cellValueMaybeNull here ...
  }
}

如何从excel表中获取特定的列数据，以便在java中使用POI将它们存储在对象的arraylist中？

1 个答案: