java office 怎样读写Excel文件

在Java中，可以使用Apache POI库来读写Excel文件。以下是一个简单的示例代码，演示如何读取和写入Excel文件：

读取Excel文件：

import org.apache.poi.ss.usermodel.*;import org.apache.poi.xssf.usermodel.XSSFWorkbook;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;public class ReadExcelFile {    public static void main(String[] args) {        try {            FileInputStream file = new FileInputStream("example.xlsx");            Workbook workbook = new XSSFWorkbook(file);            Sheet sheet = workbook.getSheetAt(0);            for (Row row : sheet) {                for (Cell cell : row) {                    switch (cell.getCellType()) {                        case STRING:                            System.out.print(cell.getStringCellValue() + "\t");                            break;                        case NUMERIC:                            System.out.print(cell.getNumericCellValue() + "\t");                            break;                        case BOOLEAN:                            System.out.print(cell.getBooleanCellValue() + "\t");                            break;                        default:                            System.out.print(" \t");                    }                }                System.out.println();            }            workbook.close();            file.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}

写入Excel文件：

import org.apache.poi.ss.usermodel.*;import org.apache.poi.xssf.usermodel.XSSFWorkbook;import java.io.FileOutputStream;import java.io.IOException;public class WriteExcelFile {    public static void main(String[] args) {        try {            Workbook workbook = new XSSFWorkbook();            Sheet sheet = workbook.createSheet("Sheet1");            Row row = sheet.createRow(0);            Cell cell = row.createCell(0);            cell.setCellValue("Hello");            FileOutputStream fileOut = new FileOutputStream("output.xlsx");            workbook.write(fileOut);            workbook.close();            fileOut.close();        } catch (IOException e) {            e.printStackTrace();        }    }}

以上是一个简单的示例，你可以根据自己的需求修改代码以满足具体的需求。希望对你有帮助。