Apache POI - 公式

本章将带您完成使用 Java 编程在单元格上应用不同公式的过程。Excel 应用程序的基本目的是通过应用公式来维护数值数据。

在公式中，我们传递动态值或 Excel 工作表中值的位置。执行此公式后，您将获得所需的结果。下表列出了 Excel 中常用的一些基本公式。

手术 句法
添加多个数字 = SUM(Loc1:Locn)或= SUM(n1,n2,)
数数 = COUNT(Loc1:Locn)或= COUNT(n1,n2,)
两个数的幂 = POWER(Loc1,Loc2)或= POWER(数字, 功率)
最大多个数字 = MAX(Loc1:Locn)或= MAX(n1,n2,)
产品 = 乘积(Loc1:Locn)或= 乘积(n1,n2,)
阶乘 = FACT(Locn)或= FACT(数字)
绝对数 = ABS(Locn)或= ABS(数字)
今天日期 =今天()
转换为小写 = LOWER(Locn)或= LOWER(text)
平方根 = SQRT(locn)或= SQRT(数字)

以下代码用于向单元格添加公式并执行它。

import java.io.File;
import java.io.FileOutputStream;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class Formula {
   public static void main(String[] args)throws Exception {
      XSSFWorkbook workbook = new XSSFWorkbook(); 
      XSSFSheet spreadsheet = workbook.createSheet("formula");
      XSSFRow row = spreadsheet.createRow(1);
      XSSFCell cell = row.createCell(1);
      
      cell.setCellValue("A = ");
      cell = row.createCell(2);
      cell.setCellValue(2);
      row = spreadsheet.createRow(2);
      cell = row.createCell(1);
      cell.setCellValue("B = ");
      cell = row.createCell(2);
      cell.setCellValue(4);
      row = spreadsheet.createRow(3);
      cell = row.createCell(1);
      cell.setCellValue("Total = ");
      cell = row.createCell(2);
      
      // Create SUM formula
      cell.setCellFormula("SUM(C2:C3)");
      cell = row.createCell(3);
      cell.setCellValue("SUM(C2:C3)");
      row = spreadsheet.createRow(4);
      cell = row.createCell(1);
      cell.setCellValue("POWER =");
      cell=row.createCell(2);
      
      // Create POWER formula
      cell.setCellFormula("POWER(C2,C3)");
      cell = row.createCell(3);
      cell.setCellValue("POWER(C2,C3)");
      row = spreadsheet.createRow(5);
      cell = row.createCell(1);
      cell.setCellValue("MAX = ");
      cell = row.createCell(2);
      
      // Create MAX formula
      cell.setCellFormula("MAX(C2,C3)");
      cell = row.createCell(3);
      cell.setCellValue("MAX(C2,C3)");
      row = spreadsheet.createRow(6);
      cell = row.createCell(1);
      cell.setCellValue("FACT = ");
      cell = row.createCell(2);
      
      // Create FACT formula
      cell.setCellFormula("FACT(C3)");
      cell = row.createCell(3);
      cell.setCellValue("FACT(C3)");
      row = spreadsheet.createRow(7);
      cell = row.createCell(1);
      cell.setCellValue("SQRT = ");
      cell = row.createCell(2);
      
      // Create SQRT formula
      cell.setCellFormula("SQRT(C5)");
      cell = row.createCell(3);
      cell.setCellValue("SQRT(C5)");
      workbook.getCreationHelper().createFormulaEvaluator().evaluateAll();
      FileOutputStream out = new FileOutputStream(new File("formula.xlsx"));
      workbook.write(out);
      out.close();
      System.out.println("fromula.xlsx written successfully");
   }
}

将上述代码保存为Formula.java，然后从命令提示符编译并执行它，如下所示 -

$javac Formula.java
$java Formula

它将在当前目录中生成一个名为Formula.xlsx的 Excel 文件，并在命令提示符下显示以下输出。

fromula.xlsx written successfully

Formula.xlsx文件如下所示 -

公式