Java代码如何读取Excel文件呢?

借助Apache POI框架
       即可读取和操作excel

Apache POI简介

Apache POI
   是Apache的开源库
    其提供一系列Java API
    可操作Microsoft Office文档  

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

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

public class ReadExcelWithApachePOI {
    public static void main(String[] args) {
        try {
            FileInputStream file = new FileInputStream(new File("path to the file"));
            
            Workbook workbook = new XSSFWorkbook(file);
            Sheet sheet = workbook.getSheetAt(0);
            Row row = sheet.getRow(0);
            Cell cell = row.getCell(0);

            System.out.println("Cell Value: " + cell.getStringCellValue());

            workbook.close();
            file.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Apache POI读取Excel数据

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import org.apache.poi.ss.usermodel.*;

public class Reader {
    public static void main(String[] args) throws Exception {
        try (FileInputStream fis = new FileInputStream(new File("Your Excel File"));
            Workbook workbook = WorkbookFactory.create(fis)) {

            Sheet sheet = workbook.getSheetAt(0);
            for (Row row : sheet) {
                for (Cell cell : row) {
                    String cellValue = null;
                    switch (cell.getCellType()) {
                    case STRING:
                        cellValue = cell.getStringCellValue();
                        break;
                    case NUMERIC:
                        cellValue = String.valueOf(cell.getNumericCellValue());
                        break;
                    case BOOLEAN:
                        cellValue = String.valueOf(cell.getBooleanCellValue());
                        break;
                    default:
                        break;
                    }
                    System.out.print(cellValue + "\t");
                }
                System.out.println();
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

读取excel时----操作日期和公式

Apache POI 不仅可以读取文本和数字，还可以处理Excel中的日期和公式。

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import org.apache.poi.ss.usermodel.*;

public class Reader {
    public static void main(String[] args) throws Exception {
        try (FileInputStream fis = new FileInputStream(new File("Your Excel File"));
            Workbook workbook = WorkbookFactory.create(fis)) {

            Sheet sheet = workbook.getSheetAt(0);
            for (Row row : sheet) {
                for (Cell cell : row) {
                    String cellValue = null;
                    switch (cell.getCellType()) {
                    case STRING:
                        cellValue = cell.getStringCellValue();
                        break;
                    case NUMERIC:
                        if (DateUtil.isCellDateFormatted(cell)) {
                            cellValue = cell.getDateCellValue().toString();
                        } else {
                            cellValue = String.valueOf(cell.getNumericCellValue());
                        }
                        break;
                    case BOOLEAN:
                        cellValue = String.valueOf(cell.getBooleanCellValue());
                        break;
                    default:
                        break;
                    }
                    System.out.print(cellValue + "\t");
                }
                System.out.println();
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

操作Excel中复杂数据类型

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator;

public class Database {
    public static void main(String[] args) throws Exception {
        try (FileInputStream fis = new FileInputStream(new File("Your Excel File"));
            Workbook workbook = WorkbookFactory.create(fis)) {

            FormulaEvaluator evaluator = new XSSFFormulaEvaluator((XSSFWorkbook) workbook);

            Sheet sheet = workbook.getSheetAt(0);

            for (Row r : sheet) {
                for (Cell c : r) {
                    if (c.getCellType() == CellType.FORMULA) {
                        evaluator.evaluateFormulaCellEnum(c);
                    }
                }
            }

          } catch (IOException e) {
            e.printStackTrace();
        }
    }
}