Apache POI - 公式

本章将引导您完成使用 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在其上应用公式来维护数值数据。

在公式中，我们传递 Excel 表格中值的动态值或位置。执行此公式后，您将获得所需的结果。下表列出了 Excel 中经常使用的一些基本公式。

运算	语法
添加多个数字	= SUM(Loc1:Locn) 或 = SUM(n1,n2,)
计数	= COUNT(Loc1:Locn) 或 = COUNT(n1,n2,)
两个数字的幂	= POWER(Loc1,Loc2) 或 = POWER(number, power)
多个数字中的最大值	= MAX(Loc1:Locn) 或 = MAX(n1,n2,)
乘积	= PRODUCT(Loc1:Locn) 或 = PRODUCT(n1,n2,)
阶乘	= FACT(Locn) 或 = FACT(number)
绝对值	= ABS(Locn) 或 = ABS(number)
今日日期	=TODAY()
转换为小写	= LOWER(Locn) 或 = LOWER(text)
平方根	= SQRT(locn) 或 = SQRT(number)

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

它将在您的当前目录中生成一个名为formula.xlsx的 Excel 文件，并在命令提示符上显示以下输出。

fromula.xlsx written successfully

formula.xlsx文件如下所示：

打印页面