java代码xlxs转csv

以下是使用Apache POI库将XLSX文件转换为CSV格式的Java代码示例：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
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.xssf.usermodel.XSSFWorkbook;

public class XLSXtoCSVConverter {

    public static void convert(File inputFile, File outputFile) throws IOException {
        XSSFWorkbook workbook = new XSSFWorkbook(new FileInputStream(inputFile));
        FileWriter csvWriter = new FileWriter(outputFile);

        Sheet sheet = workbook.getSheetAt(0);
        for (Row row : sheet) {
            for (Cell cell : row) {
                switch (cell.getCellType()) {
                    case STRING:
                        csvWriter.append(cell.getStringCellValue());
                        break;
                    case NUMERIC:
                        csvWriter.append(String.valueOf(cell.getNumericCellValue()));
                        break;
                    case BOOLEAN:
                        csvWriter.append(String.valueOf(cell.getBooleanCellValue()));
                        break;
                    case BLANK:
                        csvWriter.append("");
                        break;
                    default:
                        csvWriter.append("");
                        break;
                }
                csvWriter.append(",");
            }
            csvWriter.append("\n");
        }

        workbook.close();
        csvWriter.flush();
        csvWriter.close();
    }

}

通过调用convert()方法，并传入XLSX文件和CSV输出文件的路径，即可将XLSX文件转换为CSV格式。