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📜  Apache POI¢公式

📅  最后修改于: 2020-11-18 09:02:57             🧑  作者: Mango

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，我们在Excel工作表中传递动态值或值的位置。执行此公式后，您将获得所需的结果。下表列出了Excel中经常使用的一些基本公式。

Operation Syntax
Adding multiple numbers = SUM(Loc1:Locn) or = SUM(n1,n2,)
Count = COUNT(Loc1:Locn) or = COUNT(n1,n2,)
Power of two numbers = POWER(Loc1,Loc2) or = POWER(number, power)
Max of multiple numbers = MAX(Loc1:Locn) or = MAX(n1,n2,)
Product = PRODUCT(Loc1:Locn) or = PRODUCT(n1,n2,)
Factorial = FACT(Locn) or = FACT(number)
Absolute number = ABS(Locn) or = ABS(number)
Today date =TODAY()
Converts lowercase = LOWER(Locn) or = LOWER(text)
Square root = SQRT(locn) or = SQRT(number)

以下代码用于将公式添加到单元格并执行。

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.setCellType(XSSFCell.CELL_TYPE_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.setCellType(XSSFCell.CELL_TYPE_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.setCellType(XSSFCell.CELL_TYPE_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.setCellType(XSSFCell.CELL_TYPE_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.setCellType(XSSFCell.CELL_TYPE_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");
   }
}

将以上代码另存为Formula.java ，然后在命令提示符下进行编译并执行，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。

式