如何在Java中实现Excel操作

如何在Java中实现Excel操作

大家好，我是免费搭建查券返利机器人省钱赚佣金就用微赚淘客系统3.0的小编，也是冬天不穿秋裤，天冷也要风度的程序猿！今天我们将深入探讨如何在Java中实现对Excel文件的操作，这在日常的数据处理和报表生成中非常重要。

Java中操作Excel的常用方式

在Java中，有多种方式可以操作Excel文件，主要包括使用Apache POI库和使用第三方库JExcelApi。下面我们将分别介绍这两种方式的基本用法和示例。

使用Apache POI库操作Excel

Apache POI是一个开源的Java库，提供了对Microsoft Office格式文件（如Excel）的读写操作支持。

添加Maven依赖

首先，我们需要在项目中添加Apache POI相关的依赖：

<dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>5.3.1</version>
</dependency>
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>5.3.1</version>
</dependency>

创建Excel文件和写入数据

以下是一个简单的示例，演示如何创建一个Excel文件并写入数据：

package cn.juwatech.rebateapp.excel;import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;import java.io.FileOutputStream;
import java.io.IOException;public class ExcelWriter {public static void main(String[] args) {String excelFilePath = "data/sample.xlsx";try (Workbook workbook = new XSSFWorkbook()) {Sheet sheet = workbook.createSheet("Sheet1");Row headerRow = sheet.createRow(0);Cell headerCell = headerRow.createCell(0);headerCell.setCellValue("Name");Row dataRow = sheet.createRow(1);Cell dataCell = dataRow.createCell(0);dataCell.setCellValue("John Doe");FileOutputStream outputStream = new FileOutputStream(excelFilePath);workbook.write(outputStream);workbook.close();outputStream.close();System.out.println("Excel written successfully.");} catch (IOException e) {e.printStackTrace();}}
}

读取Excel文件内容

同样，Apache POI也可以用于读取现有的Excel文件内容：

package cn.juwatech.rebateapp.excel;import org.apache.poi.ss.usermodel.*;import java.io.FileInputStream;
import java.io.IOException;public class ExcelReader {public static void main(String[] args) {String excelFilePath = "data/sample.xlsx";try (Workbook workbook = WorkbookFactory.create(new FileInputStream(excelFilePath))) {Sheet sheet = workbook.getSheetAt(0);Row row = sheet.getRow(1);Cell cell = row.getCell(0);String cellValue = cell.getStringCellValue();System.out.println("Value in the cell: " + cellValue);} catch (IOException | EncryptedDocumentException e) {e.printStackTrace();}}
}

使用JExcelApi库操作Excel

除了Apache POI，还可以使用JExcelApi来操作Excel文件。JExcelApi相对轻量级，适合简单的Excel操作需求。

添加JExcelApi依赖

<dependency><groupId>net.sourceforge.jexcelapi</groupId><artifactId>jxl</artifactId><version>2.6.12</version>
</dependency>

示例：创建和读取Excel文件

package cn.juwatech.rebateapp.excel;import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;import java.io.File;public class JExcelApiExample {public static void main(String[] args) {try {String excelFilePath = "data/sample.xls";// Create Excel file and write dataWritableWorkbook workbook = Workbook.createWorkbook(new File(excelFilePath));WritableSheet sheet = workbook.createSheet("Sheet1", 0);Label label = new Label(0, 0, "Hello JExcelApi!");sheet.addCell(label);workbook.write();workbook.close();// Read from Excel fileWorkbook workbookRead = Workbook.getWorkbook(new File(excelFilePath));Sheet sheetRead = workbookRead.getSheet(0);Cell cell = sheetRead.getCell(0, 0);String content = cell.getContents();System.out.println("Content read from Excel: " + content);workbookRead.close();} catch (Exception e) {e.printStackTrace();}}
}