java处理excel

Java可以使用Apache POI库来处理Excel文件。下面是一个简单的例子：

1. 首先，你需要添加以下依赖项到你的pom.xml文件中：

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>4.1.2</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>4.1.2</version>
</dependency>

2. 然后，你可以使用以下代码来读取Excel文件：

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

public class ReadExcel {
    public static void main(String[] args) throws IOException {
        FileInputStream file = new FileInputStream(new File("myfile.xlsx"));
        Workbook workbook = WorkbookFactory.create(file);
        Sheet sheet = workbook.getSheetAt(0);
        for (Row row : sheet) {
            for (Cell cell : row) {
                System.out.print(cell.toString() + ", ");
            }
            System.out.println();
        }
        file.close();
    }
}

3. 如果你想要写入Excel文件，可以使用以下代码：

import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class WriteExcel {
    public static void main(String[] args) throws IOException {
        Workbook workbook = new XSSFWorkbook();
        Sheet sheet = workbook.createSheet("Sheet1");
        Row row = sheet.createRow(0);
        Cell cell = row.createCell(0);
        cell.setCellValue("Hello, World!");
        FileOutputStream file = new FileOutputStream("myfile.xlsx");
        workbook.write(file);
        file.close();
        workbook.close();
    }
}

希望对你有所帮助！