欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

java实现Excel多版本读取

程序员文章站 2022-07-13 13:16:07
...

可以读取xls和xlsx两种后缀的Excel文件,需要导入poi包(我用的poi-3.8.jar),poi-ooxml包,xmlbeans包,并且用到了log4j日志包,代码如下:

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;
import org.apache.mypoi.hssf.usermodel.HSSFWorkbook;
import org.apache.mypoi.ss.usermodel.Cell;
import org.apache.mypoi.ss.usermodel.Row;
import org.apache.mypoi.ss.usermodel.Sheet;
import org.apache.mypoi.ss.usermodel.Workbook;
import org.apache.mypoi.xssf.usermodel.XSSFWorkbook;
/**
 * excel读写工具类
 */
public class ExcelReader {
	private static Logger logger  = Logger.getLogger(ExcelReader.class);
	private final static String xls = "xls";
	private final static String xlsx = "xlsx";

	/**
	 * 读入excel文件,解析后返回
	 * @param file
	 * @throws IOException 
	 */
	public static List<String[]> readExcel(File file) throws IOException{
		//检查文件
		checkFile(file);
		//获得Workbook工作薄对象
		Workbook workbook = getWorkBook(file);
		//创建返回对象,把每行中的值作为一个数组,所有行作为一个集合返回
		List<String[]> list = new ArrayList<String[]>();
		if(workbook != null){
			for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
				//获得当前sheet工作表
				Sheet sheet = workbook.getSheetAt(sheetNum);
				if(sheet == null){
					continue;
				}
				//获得当前sheet的开始行
				int firstRowNum  = sheet.getFirstRowNum();
				//获得当前sheet的结束行
				int lastRowNum = sheet.getLastRowNum();
				//循环除了第一行的所有行
				for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){
					//获得当前行
					Row row = sheet.getRow(rowNum);
					if(row == null){
						continue;
					}
					//获得当前行的开始列
					int firstCellNum = row.getFirstCellNum();
					//获得当前行的列数
					int lastCellNum = row.getPhysicalNumberOfCells();
					String[] cells = new String[row.getPhysicalNumberOfCells()];
					//循环当前行
					for(int cellNum = firstCellNum; cellNum<lastCellNum+firstCellNum;cellNum++){
						Cell cell = row.getCell(cellNum);
						cells[cellNum-firstCellNum] = getCellValue(cell);
					}
					list.add(cells);
				}
			}
		}
		return list;
	}
	public static void checkFile(File file) throws IOException{
		//判断文件是否存在
		if(null == file||!file.exists()){
			logger.error("文件不存在!");
			throw new FileNotFoundException("文件不存在!");
		}
		//获得文件名
		String fileName = file.getName();
		//判断文件是否是excel文件
		if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){
			logger.error(fileName + "不是excel文件");
			throw new IOException(fileName + "不是excel文件");
		}
	}
	public static Workbook getWorkBook(File file) {
		//获得文件名
		String fileName = file.getName();
		//创建Workbook工作薄对象,表示整个excel
		Workbook workbook = null;
		try {
			//获取excel文件的io流
			InputStream is = new FileInputStream(file);
			//根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
			if(fileName.endsWith(xls)){
				//2003
				workbook = new HSSFWorkbook(is);
			}else if(fileName.endsWith(xlsx)){
				//2007
				workbook = new XSSFWorkbook(is);
			}
		} catch (IOException e) {
			logger.info(e.getMessage());
		}
		return workbook;
	}
	public static String getCellValue(Cell cell){
		String cellValue = "";
		if(cell == null){
			return cellValue;
		}
		//把数字当成String来读,避免出现1读成1.0的情况
		if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
			cell.setCellType(Cell.CELL_TYPE_STRING);
		}
		//判断数据的类型
		switch (cell.getCellType()){
		case Cell.CELL_TYPE_NUMERIC: //数字
			cellValue = String.valueOf(cell.getNumericCellValue());
			break;
		case Cell.CELL_TYPE_STRING: //字符串
			cellValue = String.valueOf(cell.getStringCellValue());
			break;
		case Cell.CELL_TYPE_BOOLEAN: //Boolean
			cellValue = String.valueOf(cell.getBooleanCellValue());
			break;
		case Cell.CELL_TYPE_FORMULA: //公式
			cellValue = String.valueOf(cell.getCellFormula());
			break;
		case Cell.CELL_TYPE_BLANK: //空值 
			cellValue = "";
			break;
		case Cell.CELL_TYPE_ERROR: //故障
			cellValue = "非法字符";
			break;
		default:
			cellValue = "未知类型";
			break;
		}
		return cellValue;
	}
}